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   /*
    * Copyright 2010-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
    * 
    * Licensed under the Apache License, Version 2.0 (the "License").
    * You may not use this file except in compliance with the License.
    * A copy of the License is located at
    * 
    *  http://aws.amazon.com/apache2.0
    * 
   * or in the "license" file accompanying this file. This file is distributed
   * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
   * express or implied. See the License for the specific language governing
   * permissions and limitations under the License.
   */
  package com.amazonaws.services.dynamodbv2;
  
  
  
Asynchronous client for accessing AmazonDynamoDBv2. All asynchronous calls made using this client are non-blocking. Callers could either process the result and handle the exceptions in the worker thread by providing a callback handler when making the call, or use the returned Future object to check the result of the call in the calling thread. Amazon DynamoDB

Overview

This is the Amazon DynamoDB API Reference. This guide provides descriptions and samples of the low-level DynamoDB API. For information about DynamoDB application development, see the Amazon DynamoDB Developer Guide .

Instead of making the requests to the low-level DynamoDB API directly from your application, we recommend that you use the AWS Software Development Kits (SDKs). The easy-to-use libraries in the AWS SDKs make it unnecessary to call the low-level DynamoDB API directly from your application. The libraries take care of request authentication, serialization, and connection management. For more information, see Using the AWS SDKs with DynamoDB in the Amazon DynamoDB Developer Guide .

If you decide to code against the low-level DynamoDB API directly, you will need to write the necessary code to authenticate your requests. For more information on signing your requests, see Using the DynamoDB API in the Amazon DynamoDB Developer Guide .

The following are short descriptions of each low-level API action, organized by function.

Managing Tables

  • CreateTable - Creates a table with user-specified provisioned throughput settings. You must designate one attribute as the hash primary key for the table; you can optionally designate a second attribute as the range primary key. DynamoDB creates indexes on these key attributes for fast data access. Optionally, you can create one or more secondary indexes, which provide fast data access using non-key attributes.

  • DescribeTable - Returns metadata for a table, such as table size, status, and index information.

  • UpdateTable - Modifies the provisioned throughput settings for a table. Optionally, you can modify the provisioned throughput settings for global secondary indexes on the table.

  • ListTables - Returns a list of all tables associated with the current AWS account and endpoint.

  • DeleteTable - Deletes a table and all of its indexes.

For conceptual information about managing tables, see Working with Tables in the Amazon DynamoDB Developer Guide .

Reading Data

  • GetItem - Returns a set of attributes for the item that has a given primary key. By default, GetItem performs an eventually consistent read; however, applications can request a strongly consistent read instead.

  • BatchGetItem - Performs multiple GetItem requests for data items using their primary keys, from one table or multiple tables. The response from BatchGetItem has a size limit of 16 MB and returns a maximum of 100 items. Both eventually consistent and strongly consistent reads can be used.

  • Query - Returns one or more items from a table or a secondary index. You must provide a specific hash key value. You can narrow the scope of the query using comparison operators against a range key value, or on the index key. Query supports either eventual or strong consistency. A single response has a size limit of 1 MB.

  • Scan - Reads every item in a table; the result set is eventually consistent. You can limit the number of items returned by filtering the data attributes, using conditional expressions. Scan can be used to enable ad-hoc querying of a table against non-key attributes; however, since this is a full table scan without using an index, Scan should not be used for any application query use case that requires predictable performance.

For conceptual information about reading data, see Working with Items and Query and Scan Operations in the Amazon DynamoDB Developer Guide .

Modifying Data

  • PutItem - Creates a new item, or replaces an existing item with a new item (including all the attributes). By default, if an item in the table already exists with the same primary key, the new item completely replaces the existing item. You can use conditional operators to replace an item only if its attribute values match certain conditions, or to insert a new item only if that item doesn't already exist.

  • UpdateItem - Modifies the attributes of an existing item. You can also use conditional operators to perform an update only if the item's attribute values match certain conditions.

  • DeleteItem - Deletes an item in a table by primary key. You can use conditional operators to perform a delete an item only if the item's attribute values match certain conditions.

  • BatchWriteItem - Performs multiple PutItem and DeleteItem requests across multiple tables in a single request. A failure of any request(s) in the batch will not cause the entire BatchWriteItem operation to fail. Supports batches of up to 25 items to put or delete, with a maximum total request size of 16 MB.

For conceptual information about modifying data, see Working with Items and Query and Scan Operations in the Amazon DynamoDB Developer Guide .

 
         implements AmazonDynamoDBAsync {

    
Executor service for executing asynchronous requests.
 
     private ExecutorService executorService;
 
     private static final int DEFAULT_THREAD_POOL_SIZE = 50;

    
Constructs a new asynchronous client to invoke service methods on AmazonDynamoDBv2. A credentials provider chain will be used that searches for credentials in this order:
  • Environment Variables - AWS_ACCESS_KEY_ID and AWS_SECRET_KEY
  • Java System Properties - aws.accessKeyId and aws.secretKey
  • Instance profile credentials delivered through the Amazon EC2 metadata service

All service calls made using this new client object are blocking, and will not return until the service call completes.

 
     public AmazonDynamoDBAsyncClient() {
         this(new DefaultAWSCredentialsProviderChain());
     }

    
Constructs a new asynchronous client to invoke service methods on AmazonDynamoDBv2. A credentials provider chain will be used that searches for credentials in this order:
  • Environment Variables - AWS_ACCESS_KEY_ID and AWS_SECRET_KEY
  • Java System Properties - aws.accessKeyId and aws.secretKey
  • Instance profile credentials delivered through the Amazon EC2 metadata service

All service calls made using this new client object are blocking, and will not return until the service call completes.

Parameters:
clientConfiguration The client configuration options controlling how this client connects to AmazonDynamoDBv2 (ex: proxy settings, retry counts, etc.).
See also:
com.amazonaws.auth.DefaultAWSCredentialsProviderChain
 
     public AmazonDynamoDBAsyncClient(ClientConfiguration clientConfiguration) {
         this(new DefaultAWSCredentialsProviderChain(), clientConfiguration, Executors.newFixedThreadPool(clientConfiguration.getMaxConnections()));
     }

    
Constructs a new asynchronous client to invoke service methods on AmazonDynamoDBv2 using the specified AWS account credentials. Default client settings will be used, and a fixed size thread pool will be created for executing the asynchronous tasks.

All calls made using this new client object are non-blocking, and will immediately return a Java Future object that the caller can later check to see if the service call has actually completed.

Parameters:
awsCredentials The AWS credentials (access key ID and secret key) to use when authenticating with AWS services.
 
     public AmazonDynamoDBAsyncClient(AWSCredentials awsCredentials) {
         this(awsCredentials, Executors.newFixedThreadPool());
     }

    
Constructs a new asynchronous client to invoke service methods on AmazonDynamoDBv2 using the specified AWS account credentials and executor service. Default client settings will be used.

All calls made using this new client object are non-blocking, and will immediately return a Java Future object that the caller can later check to see if the service call has actually completed.

Parameters:
awsCredentials The AWS credentials (access key ID and secret key) to use when authenticating with AWS services.
executorService The executor service by which all asynchronous requests will be executed.
 
     public AmazonDynamoDBAsyncClient(AWSCredentials awsCredentialsExecutorService executorService) {
         super(awsCredentials);
         this. = executorService;
     }

    
Constructs a new asynchronous client to invoke service methods on AmazonDynamoDBv2 using the specified AWS account credentials, executor service, and client configuration options.

All calls made using this new client object are non-blocking, and will immediately return a Java Future object that the caller can later check to see if the service call has actually completed.

Parameters:
awsCredentials The AWS credentials (access key ID and secret key) to use when authenticating with AWS services.
clientConfiguration Client configuration options (ex: max retry limit, proxy settings, etc).
executorService The executor service by which all asynchronous requests will be executed.
 
     public AmazonDynamoDBAsyncClient(AWSCredentials awsCredentials,
                 ClientConfiguration clientConfigurationExecutorService executorService) {
         super(awsCredentialsclientConfiguration);
         this. = executorService;
     }

    
Constructs a new asynchronous client to invoke service methods on AmazonDynamoDBv2 using the specified AWS account credentials provider. Default client settings will be used, and a fixed size thread pool will be created for executing the asynchronous tasks.

All calls made using this new client object are non-blocking, and will immediately return a Java Future object that the caller can later check to see if the service call has actually completed.

Parameters:
awsCredentialsProvider The AWS credentials provider which will provide credentials to authenticate requests with AWS services.
 
     public AmazonDynamoDBAsyncClient(AWSCredentialsProvider awsCredentialsProvider) {
         this(awsCredentialsProvider, Executors.newFixedThreadPool());
     }

    
Constructs a new asynchronous client to invoke service methods on AmazonDynamoDBv2 using the specified AWS account credentials provider and executor service. Default client settings will be used.

All calls made using this new client object are non-blocking, and will immediately return a Java Future object that the caller can later check to see if the service call has actually completed.

Parameters:
awsCredentialsProvider The AWS credentials provider which will provide credentials to authenticate requests with AWS services.
executorService The executor service by which all asynchronous requests will be executed.
 
     public AmazonDynamoDBAsyncClient(AWSCredentialsProvider awsCredentialsProviderExecutorService executorService) {
         this(awsCredentialsProvidernew ClientConfiguration(), executorService);
     }

    
Constructs a new asynchronous client to invoke service methods on AmazonDynamoDBv2 using the specified AWS account credentials provider and client configuration options.

All calls made using this new client object are non-blocking, and will immediately return a Java Future object that the caller can later check to see if the service call has actually completed.

Parameters:
awsCredentialsProvider The AWS credentials provider which will provide credentials to authenticate requests with AWS services.
clientConfiguration Client configuration options (ex: max retry limit, proxy settings, etc).
 
     public AmazonDynamoDBAsyncClient(AWSCredentialsProvider awsCredentialsProvider,
                 ClientConfiguration clientConfiguration) {
         this(awsCredentialsProviderclientConfiguration, Executors.newFixedThreadPool(clientConfiguration.getMaxConnections()));
     }

    
Constructs a new asynchronous client to invoke service methods on AmazonDynamoDBv2 using the specified AWS account credentials provider, executor service, and client configuration options.

All calls made using this new client object are non-blocking, and will immediately return a Java Future object that the caller can later check to see if the service call has actually completed.

Parameters:
awsCredentialsProvider The AWS credentials provider which will provide credentials to authenticate requests with AWS services.
clientConfiguration Client configuration options (ex: max retry limit, proxy settings, etc).
executorService The executor service by which all asynchronous requests will be executed.
 
     public AmazonDynamoDBAsyncClient(AWSCredentialsProvider awsCredentialsProvider,
                 ClientConfiguration clientConfigurationExecutorService executorService) {
         super(awsCredentialsProviderclientConfiguration);
         this. = executorService;
     }

    
Returns the executor service used by this async client to execute requests.

Returns:
The executor service used by this async client to execute requests.
 
     public ExecutorService getExecutorService() {
         return ;
     }

    
Shuts down the client, releasing all managed resources. This includes forcibly terminating all pending asynchronous service calls. Clients who wish to give pending asynchronous service calls time to complete should call getExecutorService().shutdown() followed by getExecutorService().awaitTermination() prior to calling this method.
 
     @Override
     public void shutdown() {
         super.shutdown();
         .shutdownNow();
     }
            
    

The Scan operation returns one or more items and item attributes by accessing every item in a table or a secondary index. To have DynamoDB return fewer items, you can provide a ScanFilter operation.

If the total number of scanned items exceeds the maximum data set size limit of 1 MB, the scan stops and results are returned to the user as a LastEvaluatedKey value to continue the scan in a subsequent operation. The results also include the number of items exceeding the limit. A scan can result in no table data meeting the filter criteria.

The result set is eventually consistent.

By default, Scan operations proceed sequentially; however, for faster performance on a large table or secondary index, applications can request a parallel Scan operation by providing the Segment and TotalSegments parameters. For more information, see Parallel Scan in the Amazon DynamoDB Developer Guide .

Parameters:
scanRequest Container for the necessary parameters to execute the Scan operation on AmazonDynamoDBv2.
Returns:
A Java Future object containing the response from the Scan service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
 
     public Future<ScanResultscanAsync(final ScanRequest scanRequest
             throws AmazonServiceExceptionAmazonClientException {
         return .submit(new Callable<ScanResult>() {
             public ScanResult call() throws Exception {
                 return scan(scanRequest);
         }
     });
     }

    

The Scan operation returns one or more items and item attributes by accessing every item in a table or a secondary index. To have DynamoDB return fewer items, you can provide a ScanFilter operation.

If the total number of scanned items exceeds the maximum data set size limit of 1 MB, the scan stops and results are returned to the user as a LastEvaluatedKey value to continue the scan in a subsequent operation. The results also include the number of items exceeding the limit. A scan can result in no table data meeting the filter criteria.

The result set is eventually consistent.

By default, Scan operations proceed sequentially; however, for faster performance on a large table or secondary index, applications can request a parallel Scan operation by providing the Segment and TotalSegments parameters. For more information, see Parallel Scan in the Amazon DynamoDB Developer Guide .

Parameters:
scanRequest Container for the necessary parameters to execute the Scan operation on AmazonDynamoDBv2.
asyncHandler Asynchronous callback handler for events in the life-cycle of the request. Users could provide the implementation of the four callback methods in this interface to process the operation result or handle the exception.
Returns:
A Java Future object containing the response from the Scan service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
 
     public Future<ScanResultscanAsync(
             final ScanRequest scanRequest,
             final AsyncHandler<ScanRequestScanResultasyncHandler)
                     throws AmazonServiceExceptionAmazonClientException {
         return .submit(new Callable<ScanResult>() {
             public ScanResult call() throws Exception {
               ScanResult result;
                 try {
                 result = scan(scanRequest);
               } catch (Exception ex) {
                   asyncHandler.onError(ex);
             throw ex;
               }
               asyncHandler.onSuccess(scanRequestresult);
                  return result;
         }
     });
     }
    
    

Updates the provisioned throughput for the given table, or manages the global secondary indexes on the table.

You can increase or decrease the table's provisioned throughput values within the maximums and minimums listed in the Limits section in the Amazon DynamoDB Developer Guide .

In addition, you can use UpdateTable to add, modify or delete global secondary indexes on the table. For more information, see Managing Global Secondary Indexes in the Amazon DynamoDB Developer Guide .

The table must be in the ACTIVE state for UpdateTable to succeed. UpdateTable is an asynchronous operation; while executing the operation, the table is in the UPDATING state. While the table is in the UPDATING state, the table still has the provisioned throughput from before the call. The table's new provisioned throughput settings go into effect when the table returns to the ACTIVE state; at that point, the UpdateTable operation is complete.

Parameters:
updateTableRequest Container for the necessary parameters to execute the UpdateTable operation on AmazonDynamoDBv2.
Returns:
A Java Future object containing the response from the UpdateTable service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
 
     public Future<UpdateTableResultupdateTableAsync(final UpdateTableRequest updateTableRequest
             throws AmazonServiceExceptionAmazonClientException {
         return .submit(new Callable<UpdateTableResult>() {
             public UpdateTableResult call() throws Exception {
                 return updateTable(updateTableRequest);
         }
     });
     }

    

Updates the provisioned throughput for the given table, or manages the global secondary indexes on the table.

You can increase or decrease the table's provisioned throughput values within the maximums and minimums listed in the Limits section in the Amazon DynamoDB Developer Guide .

In addition, you can use UpdateTable to add, modify or delete global secondary indexes on the table. For more information, see Managing Global Secondary Indexes in the Amazon DynamoDB Developer Guide .

The table must be in the ACTIVE state for UpdateTable to succeed. UpdateTable is an asynchronous operation; while executing the operation, the table is in the UPDATING state. While the table is in the UPDATING state, the table still has the provisioned throughput from before the call. The table's new provisioned throughput settings go into effect when the table returns to the ACTIVE state; at that point, the UpdateTable operation is complete.

Parameters:
updateTableRequest Container for the necessary parameters to execute the UpdateTable operation on AmazonDynamoDBv2.
asyncHandler Asynchronous callback handler for events in the life-cycle of the request. Users could provide the implementation of the four callback methods in this interface to process the operation result or handle the exception.
Returns:
A Java Future object containing the response from the UpdateTable service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
 
             final UpdateTableRequest updateTableRequest,
             final AsyncHandler<UpdateTableRequestUpdateTableResultasyncHandler)
                     throws AmazonServiceExceptionAmazonClientException {
         return .submit(new Callable<UpdateTableResult>() {
             public UpdateTableResult call() throws Exception {
               UpdateTableResult result;
                 try {
                 result = updateTable(updateTableRequest);
               } catch (Exception ex) {
                   asyncHandler.onError(ex);
             throw ex;
               }
               asyncHandler.onSuccess(updateTableRequestresult);
                  return result;
         }
     });
     }
    
    

The DeleteTable operation deletes a table and all of its items. After a DeleteTable request, the specified table is in the DELETING state until DynamoDB completes the deletion. If the table is in the ACTIVE state, you can delete it. If a table is in CREATING or UPDATING states, then DynamoDB returns a ResourceInUseException . If the specified table does not exist, DynamoDB returns a ResourceNotFoundException . If table is already in the DELETING state, no error is returned.

NOTE: DynamoDB might continue to accept data read and write operations, such as GetItem and PutItem, on a table in the DELETING state until the table deletion is complete.

When you delete a table, any indexes on that table are also deleted.

Use the DescribeTable API to check the status of the table.

Parameters:
deleteTableRequest Container for the necessary parameters to execute the DeleteTable operation on AmazonDynamoDBv2.
Returns:
A Java Future object containing the response from the DeleteTable service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
 
     public Future<DeleteTableResultdeleteTableAsync(final DeleteTableRequest deleteTableRequest
             throws AmazonServiceExceptionAmazonClientException {
         return .submit(new Callable<DeleteTableResult>() {
             public DeleteTableResult call() throws Exception {
                 return deleteTable(deleteTableRequest);
         }
     });
     }

    

The DeleteTable operation deletes a table and all of its items. After a DeleteTable request, the specified table is in the DELETING state until DynamoDB completes the deletion. If the table is in the ACTIVE state, you can delete it. If a table is in CREATING or UPDATING states, then DynamoDB returns a ResourceInUseException . If the specified table does not exist, DynamoDB returns a ResourceNotFoundException . If table is already in the DELETING state, no error is returned.

NOTE: DynamoDB might continue to accept data read and write operations, such as GetItem and PutItem, on a table in the DELETING state until the table deletion is complete.

When you delete a table, any indexes on that table are also deleted.

Use the DescribeTable API to check the status of the table.

Parameters:
deleteTableRequest Container for the necessary parameters to execute the DeleteTable operation on AmazonDynamoDBv2.
asyncHandler Asynchronous callback handler for events in the life-cycle of the request. Users could provide the implementation of the four callback methods in this interface to process the operation result or handle the exception.
Returns:
A Java Future object containing the response from the DeleteTable service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
 
             final DeleteTableRequest deleteTableRequest,
             final AsyncHandler<DeleteTableRequestDeleteTableResultasyncHandler)
                     throws AmazonServiceExceptionAmazonClientException {
         return .submit(new Callable<DeleteTableResult>() {
             public DeleteTableResult call() throws Exception {
               DeleteTableResult result;
                 try {
                 result = deleteTable(deleteTableRequest);
               } catch (Exception ex) {
                   asyncHandler.onError(ex);
             throw ex;
               }
               asyncHandler.onSuccess(deleteTableRequestresult);
                  return result;
         }
     });
     }
    
    

The BatchWriteItem operation puts or deletes multiple items in one or more tables. A single call to BatchWriteItem can write up to 16 MB of data, which can comprise as many as 25 put or delete requests. Individual items to be written can be as large as 400 KB.

NOTE: BatchWriteItem cannot update items. To update items, use the UpdateItem API.

The individual PutItem and DeleteItem operations specified in BatchWriteItem are atomic; however BatchWriteItem as a whole is not. If any requested operations fail because the table's provisioned throughput is exceeded or an internal processing failure occurs, the failed operations are returned in the UnprocessedItems response parameter. You can investigate and optionally resend the requests. Typically, you would call BatchWriteItem in a loop. Each iteration would check for unprocessed items and submit a new BatchWriteItem request with those unprocessed items until all items have been processed.

Note that if none of the items can be processed due to insufficient provisioned throughput on all of the tables in the request, then BatchWriteItem will return a ProvisionedThroughputExceededException .

IMPORTANT: If DynamoDB returns any unprocessed items, you should retry the batch operation on those items. However, we strongly recommend that you use an exponential backoff algorithm. If you retry the batch operation immediately, the underlying read or write requests can still fail due to throttling on the individual tables. If you delay the batch operation using exponential backoff, the individual requests in the batch are much more likely to succeed. For more information, see Batch Operations and Error Handling in the Amazon DynamoDB Developer Guide.

With BatchWriteItem , you can efficiently write or delete large amounts of data, such as from Amazon Elastic MapReduce (EMR), or copy data from another database into DynamoDB. In order to improve performance with these large-scale operations, BatchWriteItem does not behave in the same way as individual PutItem and DeleteItem calls would. For example, you cannot specify conditions on individual put and delete requests, and BatchWriteItem does not return deleted items in the response.

If you use a programming language that supports concurrency, such as Java, you can use threads to write items in parallel. Your application must include the necessary logic to manage the threads. With languages that don't support threading, such as PHP, you must update or delete the specified items one at a time. In both situations, BatchWriteItem provides an alternative where the API performs the specified put and delete operations in parallel, giving you the power of the thread pool approach without having to introduce complexity into your application.

Parallel processing reduces latency, but each specified put and delete request consumes the same number of write capacity units whether it is processed in parallel or not. Delete operations on nonexistent items consume one write capacity unit.

If one or more of the following is true, DynamoDB rejects the entire batch write operation:

  • One or more tables specified in the BatchWriteItem request does not exist.

  • Primary key attributes specified on an item in the request do not match those in the corresponding table's primary key schema.

  • You try to perform multiple operations on the same item in the same BatchWriteItem request. For example, you cannot put and delete the same item in the same BatchWriteItem request.

  • There are more than 25 requests in the batch.

  • Any individual item in a batch exceeds 400 KB.

  • The total request size exceeds 16 MB.

Parameters:
batchWriteItemRequest Container for the necessary parameters to execute the BatchWriteItem operation on AmazonDynamoDBv2.
Returns:
A Java Future object containing the response from the BatchWriteItem service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
 
     public Future<BatchWriteItemResultbatchWriteItemAsync(final BatchWriteItemRequest batchWriteItemRequest
             throws AmazonServiceExceptionAmazonClientException {
         return .submit(new Callable<BatchWriteItemResult>() {
             public BatchWriteItemResult call() throws Exception {
                 return batchWriteItem(batchWriteItemRequest);
         }
     });
     }

    

The BatchWriteItem operation puts or deletes multiple items in one or more tables. A single call to BatchWriteItem can write up to 16 MB of data, which can comprise as many as 25 put or delete requests. Individual items to be written can be as large as 400 KB.

NOTE: BatchWriteItem cannot update items. To update items, use the UpdateItem API.

The individual PutItem and DeleteItem operations specified in BatchWriteItem are atomic; however BatchWriteItem as a whole is not. If any requested operations fail because the table's provisioned throughput is exceeded or an internal processing failure occurs, the failed operations are returned in the UnprocessedItems response parameter. You can investigate and optionally resend the requests. Typically, you would call BatchWriteItem in a loop. Each iteration would check for unprocessed items and submit a new BatchWriteItem request with those unprocessed items until all items have been processed.

Note that if none of the items can be processed due to insufficient provisioned throughput on all of the tables in the request, then BatchWriteItem will return a ProvisionedThroughputExceededException .

IMPORTANT: If DynamoDB returns any unprocessed items, you should retry the batch operation on those items. However, we strongly recommend that you use an exponential backoff algorithm. If you retry the batch operation immediately, the underlying read or write requests can still fail due to throttling on the individual tables. If you delay the batch operation using exponential backoff, the individual requests in the batch are much more likely to succeed. For more information, see Batch Operations and Error Handling in the Amazon DynamoDB Developer Guide.

With BatchWriteItem , you can efficiently write or delete large amounts of data, such as from Amazon Elastic MapReduce (EMR), or copy data from another database into DynamoDB. In order to improve performance with these large-scale operations, BatchWriteItem does not behave in the same way as individual PutItem and DeleteItem calls would. For example, you cannot specify conditions on individual put and delete requests, and BatchWriteItem does not return deleted items in the response.

If you use a programming language that supports concurrency, such as Java, you can use threads to write items in parallel. Your application must include the necessary logic to manage the threads. With languages that don't support threading, such as PHP, you must update or delete the specified items one at a time. In both situations, BatchWriteItem provides an alternative where the API performs the specified put and delete operations in parallel, giving you the power of the thread pool approach without having to introduce complexity into your application.

Parallel processing reduces latency, but each specified put and delete request consumes the same number of write capacity units whether it is processed in parallel or not. Delete operations on nonexistent items consume one write capacity unit.

If one or more of the following is true, DynamoDB rejects the entire batch write operation:

  • One or more tables specified in the BatchWriteItem request does not exist.

  • Primary key attributes specified on an item in the request do not match those in the corresponding table's primary key schema.

  • You try to perform multiple operations on the same item in the same BatchWriteItem request. For example, you cannot put and delete the same item in the same BatchWriteItem request.

  • There are more than 25 requests in the batch.

  • Any individual item in a batch exceeds 400 KB.

  • The total request size exceeds 16 MB.

Parameters:
batchWriteItemRequest Container for the necessary parameters to execute the BatchWriteItem operation on AmazonDynamoDBv2.
asyncHandler Asynchronous callback handler for events in the life-cycle of the request. Users could provide the implementation of the four callback methods in this interface to process the operation result or handle the exception.
Returns:
A Java Future object containing the response from the BatchWriteItem service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
            final BatchWriteItemRequest batchWriteItemRequest,
            final AsyncHandler<BatchWriteItemRequestBatchWriteItemResultasyncHandler)
                    throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<BatchWriteItemResult>() {
            public BatchWriteItemResult call() throws Exception {
              BatchWriteItemResult result;
                try {
                result = batchWriteItem(batchWriteItemRequest);
              } catch (Exception ex) {
                  asyncHandler.onError(ex);
            throw ex;
              }
              asyncHandler.onSuccess(batchWriteItemRequestresult);
                 return result;
        }
    });
    }
    
    

Returns information about the table, including the current status of the table, when it was created, the primary key schema, and any indexes on the table.

NOTE: If you issue a DescribeTable request immediately after a CreateTable request, DynamoDB might return a ResourceNotFoundException. This is because DescribeTable uses an eventually consistent query, and the metadata for your table might not be available at that moment. Wait for a few seconds, and then try the DescribeTable request again.

Parameters:
describeTableRequest Container for the necessary parameters to execute the DescribeTable operation on AmazonDynamoDBv2.
Returns:
A Java Future object containing the response from the DescribeTable service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
    public Future<DescribeTableResultdescribeTableAsync(final DescribeTableRequest describeTableRequest
            throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<DescribeTableResult>() {
            public DescribeTableResult call() throws Exception {
                return describeTable(describeTableRequest);
        }
    });
    }

    

Returns information about the table, including the current status of the table, when it was created, the primary key schema, and any indexes on the table.

NOTE: If you issue a DescribeTable request immediately after a CreateTable request, DynamoDB might return a ResourceNotFoundException. This is because DescribeTable uses an eventually consistent query, and the metadata for your table might not be available at that moment. Wait for a few seconds, and then try the DescribeTable request again.

Parameters:
describeTableRequest Container for the necessary parameters to execute the DescribeTable operation on AmazonDynamoDBv2.
asyncHandler Asynchronous callback handler for events in the life-cycle of the request. Users could provide the implementation of the four callback methods in this interface to process the operation result or handle the exception.
Returns:
A Java Future object containing the response from the DescribeTable service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
            final DescribeTableRequest describeTableRequest,
            final AsyncHandler<DescribeTableRequestDescribeTableResultasyncHandler)
                    throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<DescribeTableResult>() {
            public DescribeTableResult call() throws Exception {
              DescribeTableResult result;
                try {
                result = describeTable(describeTableRequest);
              } catch (Exception ex) {
                  asyncHandler.onError(ex);
            throw ex;
              }
              asyncHandler.onSuccess(describeTableRequestresult);
                 return result;
        }
    });
    }
    
    

The GetItem operation returns a set of attributes for the item with the given primary key. If there is no matching item, GetItem does not return any data.

GetItem provides an eventually consistent read by default. If your application requires a strongly consistent read, set ConsistentRead to true . Although a strongly consistent read might take more time than an eventually consistent read, it always returns the last updated value.

Parameters:
getItemRequest Container for the necessary parameters to execute the GetItem operation on AmazonDynamoDBv2.
Returns:
A Java Future object containing the response from the GetItem service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
    public Future<GetItemResultgetItemAsync(final GetItemRequest getItemRequest
            throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<GetItemResult>() {
            public GetItemResult call() throws Exception {
                return getItem(getItemRequest);
        }
    });
    }

    

The GetItem operation returns a set of attributes for the item with the given primary key. If there is no matching item, GetItem does not return any data.

GetItem provides an eventually consistent read by default. If your application requires a strongly consistent read, set ConsistentRead to true . Although a strongly consistent read might take more time than an eventually consistent read, it always returns the last updated value.

Parameters:
getItemRequest Container for the necessary parameters to execute the GetItem operation on AmazonDynamoDBv2.
asyncHandler Asynchronous callback handler for events in the life-cycle of the request. Users could provide the implementation of the four callback methods in this interface to process the operation result or handle the exception.
Returns:
A Java Future object containing the response from the GetItem service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
            final GetItemRequest getItemRequest,
            final AsyncHandler<GetItemRequestGetItemResultasyncHandler)
                    throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<GetItemResult>() {
            public GetItemResult call() throws Exception {
              GetItemResult result;
                try {
                result = getItem(getItemRequest);
              } catch (Exception ex) {
                  asyncHandler.onError(ex);
            throw ex;
              }
              asyncHandler.onSuccess(getItemRequestresult);
                 return result;
        }
    });
    }
    
    

Deletes a single item in a table by primary key. You can perform a conditional delete operation that deletes the item if it exists, or if it has an expected attribute value.

In addition to deleting an item, you can also return the item's attribute values in the same operation, using the ReturnValues parameter.

Unless you specify conditions, the DeleteItem is an idempotent operation; running it multiple times on the same item or attribute does not result in an error response.

Conditional deletes are useful for deleting items only if specific conditions are met. If those conditions are met, DynamoDB performs the delete. Otherwise, the item is not deleted.

Parameters:
deleteItemRequest Container for the necessary parameters to execute the DeleteItem operation on AmazonDynamoDBv2.
Returns:
A Java Future object containing the response from the DeleteItem service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
    public Future<DeleteItemResultdeleteItemAsync(final DeleteItemRequest deleteItemRequest
            throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<DeleteItemResult>() {
            public DeleteItemResult call() throws Exception {
                return deleteItem(deleteItemRequest);
        }
    });
    }

    

Deletes a single item in a table by primary key. You can perform a conditional delete operation that deletes the item if it exists, or if it has an expected attribute value.

In addition to deleting an item, you can also return the item's attribute values in the same operation, using the ReturnValues parameter.

Unless you specify conditions, the DeleteItem is an idempotent operation; running it multiple times on the same item or attribute does not result in an error response.

Conditional deletes are useful for deleting items only if specific conditions are met. If those conditions are met, DynamoDB performs the delete. Otherwise, the item is not deleted.

Parameters:
deleteItemRequest Container for the necessary parameters to execute the DeleteItem operation on AmazonDynamoDBv2.
asyncHandler Asynchronous callback handler for events in the life-cycle of the request. Users could provide the implementation of the four callback methods in this interface to process the operation result or handle the exception.
Returns:
A Java Future object containing the response from the DeleteItem service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
            final DeleteItemRequest deleteItemRequest,
            final AsyncHandler<DeleteItemRequestDeleteItemResultasyncHandler)
                    throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<DeleteItemResult>() {
            public DeleteItemResult call() throws Exception {
              DeleteItemResult result;
                try {
                result = deleteItem(deleteItemRequest);
              } catch (Exception ex) {
                  asyncHandler.onError(ex);
            throw ex;
              }
              asyncHandler.onSuccess(deleteItemRequestresult);
                 return result;
        }
    });
    }
    
    

The CreateTable operation adds a new table to your account. In an AWS account, table names must be unique within each region. That is, you can have two tables with same name if you create the tables in different regions.

CreateTable is an asynchronous operation. Upon receiving a CreateTable request, DynamoDB immediately returns a response with a TableStatus of CREATING . After the table is created, DynamoDB sets the TableStatus to ACTIVE . You can perform read and write operations only on an ACTIVE table.

You can optionally define secondary indexes on the new table, as part of the CreateTable operation. If you want to create multiple tables with secondary indexes on them, you must create the tables sequentially. Only one table with secondary indexes can be in the CREATING state at any given time.

You can use the DescribeTable API to check the table status.

Parameters:
createTableRequest Container for the necessary parameters to execute the CreateTable operation on AmazonDynamoDBv2.
Returns:
A Java Future object containing the response from the CreateTable service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
    public Future<CreateTableResultcreateTableAsync(final CreateTableRequest createTableRequest
            throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<CreateTableResult>() {
            public CreateTableResult call() throws Exception {
                return createTable(createTableRequest);
        }
    });
    }

    

The CreateTable operation adds a new table to your account. In an AWS account, table names must be unique within each region. That is, you can have two tables with same name if you create the tables in different regions.

CreateTable is an asynchronous operation. Upon receiving a CreateTable request, DynamoDB immediately returns a response with a TableStatus of CREATING . After the table is created, DynamoDB sets the TableStatus to ACTIVE . You can perform read and write operations only on an ACTIVE table.

You can optionally define secondary indexes on the new table, as part of the CreateTable operation. If you want to create multiple tables with secondary indexes on them, you must create the tables sequentially. Only one table with secondary indexes can be in the CREATING state at any given time.

You can use the DescribeTable API to check the table status.

Parameters:
createTableRequest Container for the necessary parameters to execute the CreateTable operation on AmazonDynamoDBv2.
asyncHandler Asynchronous callback handler for events in the life-cycle of the request. Users could provide the implementation of the four callback methods in this interface to process the operation result or handle the exception.
Returns:
A Java Future object containing the response from the CreateTable service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
            final CreateTableRequest createTableRequest,
            final AsyncHandler<CreateTableRequestCreateTableResultasyncHandler)
                    throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<CreateTableResult>() {
            public CreateTableResult call() throws Exception {
              CreateTableResult result;
                try {
                result = createTable(createTableRequest);
              } catch (Exception ex) {
                  asyncHandler.onError(ex);
            throw ex;
              }
              asyncHandler.onSuccess(createTableRequestresult);
                 return result;
        }
    });
    }
    
    

A Query operation uses the primary key of a table or a secondary index to directly access items from that table or index.

Use the KeyConditionExpression parameter to provide a specific hash key value. The Query operation will return all of the items from the table or index with that hash key value. You can optionally narrow the scope of the Query operation by specifying a range key value and a comparison operator in KeyConditionExpression . You can use the ScanIndexForward parameter to get results in forward or reverse order, by range key or by index key.

Queries that do not return results consume the minimum number of read capacity units for that type of read operation.

If the total number of items meeting the query criteria exceeds the result set size limit of 1 MB, the query stops and results are returned to the user with the LastEvaluatedKey element to continue the query in a subsequent operation. Unlike a Scan operation, a Query operation never returns both an empty result set and a LastEvaluatedKey value. LastEvaluatedKey is only provided if the results exceed 1 MB, or if you have used the Limit parameter.

You can query a table, a local secondary index, or a global secondary index. For a query on a table or on a local secondary index, you can set the ConsistentRead parameter to true and obtain a strongly consistent result. Global secondary indexes support eventually consistent reads only, so do not specify ConsistentRead when querying a global secondary index.

Parameters:
queryRequest Container for the necessary parameters to execute the Query operation on AmazonDynamoDBv2.
Returns:
A Java Future object containing the response from the Query service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
    public Future<QueryResultqueryAsync(final QueryRequest queryRequest
            throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<QueryResult>() {
            public QueryResult call() throws Exception {
                return query(queryRequest);
        }
    });
    }

    

A Query operation uses the primary key of a table or a secondary index to directly access items from that table or index.

Use the KeyConditionExpression parameter to provide a specific hash key value. The Query operation will return all of the items from the table or index with that hash key value. You can optionally narrow the scope of the Query operation by specifying a range key value and a comparison operator in KeyConditionExpression . You can use the ScanIndexForward parameter to get results in forward or reverse order, by range key or by index key.

Queries that do not return results consume the minimum number of read capacity units for that type of read operation.

If the total number of items meeting the query criteria exceeds the result set size limit of 1 MB, the query stops and results are returned to the user with the LastEvaluatedKey element to continue the query in a subsequent operation. Unlike a Scan operation, a Query operation never returns both an empty result set and a LastEvaluatedKey value. LastEvaluatedKey is only provided if the results exceed 1 MB, or if you have used the Limit parameter.

You can query a table, a local secondary index, or a global secondary index. For a query on a table or on a local secondary index, you can set the ConsistentRead parameter to true and obtain a strongly consistent result. Global secondary indexes support eventually consistent reads only, so do not specify ConsistentRead when querying a global secondary index.

Parameters:
queryRequest Container for the necessary parameters to execute the Query operation on AmazonDynamoDBv2.
asyncHandler Asynchronous callback handler for events in the life-cycle of the request. Users could provide the implementation of the four callback methods in this interface to process the operation result or handle the exception.
Returns:
A Java Future object containing the response from the Query service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
    public Future<QueryResultqueryAsync(
            final QueryRequest queryRequest,
            final AsyncHandler<QueryRequestQueryResultasyncHandler)
                    throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<QueryResult>() {
            public QueryResult call() throws Exception {
              QueryResult result;
                try {
                result = query(queryRequest);
              } catch (Exception ex) {
                  asyncHandler.onError(ex);
            throw ex;
              }
              asyncHandler.onSuccess(queryRequestresult);
                 return result;
        }
    });
    }
    
    

Creates a new item, or replaces an old item with a new item. If an item that has the same primary key as the new item already exists in the specified table, the new item completely replaces the existing item. You can perform a conditional put operation (add a new item if one with the specified primary key doesn't exist), or replace an existing item if it has certain attribute values.

In addition to putting an item, you can also return the item's attribute values in the same operation, using the ReturnValues parameter.

When you add an item, the primary key attribute(s) are the only required attributes. Attribute values cannot be null. String and Binary type attributes must have lengths greater than zero. Set type attributes cannot be empty. Requests with empty values will be rejected with a ValidationException exception.

You can request that PutItem return either a copy of the original item (before the update) or a copy of the updated item (after the update). For more information, see the ReturnValues description below.

NOTE: To prevent a new item from replacing an existing item, use a conditional put operation with ComparisonOperator set to NULL for the primary key attribute, or attributes.

For more information about using this API, see Working with Items in the Amazon DynamoDB Developer Guide .

Parameters:
putItemRequest Container for the necessary parameters to execute the PutItem operation on AmazonDynamoDBv2.
Returns:
A Java Future object containing the response from the PutItem service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
    public Future<PutItemResultputItemAsync(final PutItemRequest putItemRequest
            throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<PutItemResult>() {
            public PutItemResult call() throws Exception {
                return putItem(putItemRequest);
        }
    });
    }

    

Creates a new item, or replaces an old item with a new item. If an item that has the same primary key as the new item already exists in the specified table, the new item completely replaces the existing item. You can perform a conditional put operation (add a new item if one with the specified primary key doesn't exist), or replace an existing item if it has certain attribute values.

In addition to putting an item, you can also return the item's attribute values in the same operation, using the ReturnValues parameter.

When you add an item, the primary key attribute(s) are the only required attributes. Attribute values cannot be null. String and Binary type attributes must have lengths greater than zero. Set type attributes cannot be empty. Requests with empty values will be rejected with a ValidationException exception.

You can request that PutItem return either a copy of the original item (before the update) or a copy of the updated item (after the update). For more information, see the ReturnValues description below.

NOTE: To prevent a new item from replacing an existing item, use a conditional put operation with ComparisonOperator set to NULL for the primary key attribute, or attributes.

For more information about using this API, see Working with Items in the Amazon DynamoDB Developer Guide .

Parameters:
putItemRequest Container for the necessary parameters to execute the PutItem operation on AmazonDynamoDBv2.
asyncHandler Asynchronous callback handler for events in the life-cycle of the request. Users could provide the implementation of the four callback methods in this interface to process the operation result or handle the exception.
Returns:
A Java Future object containing the response from the PutItem service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
            final PutItemRequest putItemRequest,
            final AsyncHandler<PutItemRequestPutItemResultasyncHandler)
                    throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<PutItemResult>() {
            public PutItemResult call() throws Exception {
              PutItemResult result;
                try {
                result = putItem(putItemRequest);
              } catch (Exception ex) {
                  asyncHandler.onError(ex);
            throw ex;
              }
              asyncHandler.onSuccess(putItemRequestresult);
                 return result;
        }
    });
    }
    
    

Returns an array of table names associated with the current account and endpoint. The output from ListTables is paginated, with each page returning a maximum of 100 table names.

Parameters:
listTablesRequest Container for the necessary parameters to execute the ListTables operation on AmazonDynamoDBv2.
Returns:
A Java Future object containing the response from the ListTables service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
    public Future<ListTablesResultlistTablesAsync(final ListTablesRequest listTablesRequest
            throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<ListTablesResult>() {
            public ListTablesResult call() throws Exception {
                return listTables(listTablesRequest);
        }
    });
    }

    

Returns an array of table names associated with the current account and endpoint. The output from ListTables is paginated, with each page returning a maximum of 100 table names.

Parameters:
listTablesRequest Container for the necessary parameters to execute the ListTables operation on AmazonDynamoDBv2.
asyncHandler Asynchronous callback handler for events in the life-cycle of the request. Users could provide the implementation of the four callback methods in this interface to process the operation result or handle the exception.
Returns:
A Java Future object containing the response from the ListTables service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
            final ListTablesRequest listTablesRequest,
            final AsyncHandler<ListTablesRequestListTablesResultasyncHandler)
                    throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<ListTablesResult>() {
            public ListTablesResult call() throws Exception {
              ListTablesResult result;
                try {
                result = listTables(listTablesRequest);
              } catch (Exception ex) {
                  asyncHandler.onError(ex);
            throw ex;
              }
              asyncHandler.onSuccess(listTablesRequestresult);
                 return result;
        }
    });
    }
    
    

Edits an existing item's attributes, or adds a new item to the table if it does not already exist. You can put, delete, or add attribute values. You can also perform a conditional update on an existing item (insert a new attribute name-value pair if it doesn't exist, or replace an existing name-value pair if it has certain expected attribute values). If conditions are specified and the item does not exist, then the operation fails and a new item is not created.

You can also return the item's attribute values in the same UpdateItem operation using the ReturnValues parameter.

Parameters:
updateItemRequest Container for the necessary parameters to execute the UpdateItem operation on AmazonDynamoDBv2.
Returns:
A Java Future object containing the response from the UpdateItem service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
    public Future<UpdateItemResultupdateItemAsync(final UpdateItemRequest updateItemRequest
            throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<UpdateItemResult>() {
            public UpdateItemResult call() throws Exception {
                return updateItem(updateItemRequest);
        }
    });
    }

    

Edits an existing item's attributes, or adds a new item to the table if it does not already exist. You can put, delete, or add attribute values. You can also perform a conditional update on an existing item (insert a new attribute name-value pair if it doesn't exist, or replace an existing name-value pair if it has certain expected attribute values). If conditions are specified and the item does not exist, then the operation fails and a new item is not created.

You can also return the item's attribute values in the same UpdateItem operation using the ReturnValues parameter.

Parameters:
updateItemRequest Container for the necessary parameters to execute the UpdateItem operation on AmazonDynamoDBv2.
asyncHandler Asynchronous callback handler for events in the life-cycle of the request. Users could provide the implementation of the four callback methods in this interface to process the operation result or handle the exception.
Returns:
A Java Future object containing the response from the UpdateItem service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
            final UpdateItemRequest updateItemRequest,
            final AsyncHandler<UpdateItemRequestUpdateItemResultasyncHandler)
                    throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<UpdateItemResult>() {
            public UpdateItemResult call() throws Exception {
              UpdateItemResult result;
                try {
                result = updateItem(updateItemRequest);
              } catch (Exception ex) {
                  asyncHandler.onError(ex);
            throw ex;
              }
              asyncHandler.onSuccess(updateItemRequestresult);
                 return result;
        }
    });
    }
    
    

The BatchGetItem operation returns the attributes of one or more items from one or more tables. You identify requested items by primary key.

A single operation can retrieve up to 16 MB of data, which can contain as many as 100 items. BatchGetItem will return a partial result if the response size limit is exceeded, the table's provisioned throughput is exceeded, or an internal processing failure occurs. If a partial result is returned, the operation returns a value for UnprocessedKeys . You can use this value to retry the operation starting with the next item to get.

For example, if you ask to retrieve 100 items, but each individual item is 300 KB in size, the system returns 52 items (so as not to exceed the 16 MB limit). It also returns an appropriate UnprocessedKeys value so you can get the next page of results. If desired, your application can include its own logic to assemble the pages of results into one data set.

If none of the items can be processed due to insufficient provisioned throughput on all of the tables in the request, then BatchGetItem will return a ProvisionedThroughputExceededException . If at least one of the items is successfully processed, then BatchGetItem completes successfully, while returning the keys of the unread items in UnprocessedKeys .

IMPORTANT: If DynamoDB returns any unprocessed items, you should retry the batch operation on those items. However, we strongly recommend that you use an exponential backoff algorithm. If you retry the batch operation immediately, the underlying read or write requests can still fail due to throttling on the individual tables. If you delay the batch operation using exponential backoff, the individual requests in the batch are much more likely to succeed. For more information, see Batch Operations and Error Handling in the Amazon DynamoDB Developer Guide.

By default, BatchGetItem performs eventually consistent reads on every table in the request. If you want strongly consistent reads instead, you can set ConsistentRead to true for any or all tables.

In order to minimize response latency, BatchGetItem retrieves items in parallel.

When designing your application, keep in mind that DynamoDB does not return attributes in any particular order. To help parse the response by item, include the primary key values for the items in your request in the AttributesToGet parameter.

If a requested item does not exist, it is not returned in the result. Requests for nonexistent items consume the minimum read capacity units according to the type of read. For more information, see Capacity Units Calculations in the Amazon DynamoDB Developer Guide .

Parameters:
batchGetItemRequest Container for the necessary parameters to execute the BatchGetItem operation on AmazonDynamoDBv2.
Returns:
A Java Future object containing the response from the BatchGetItem service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
    public Future<BatchGetItemResultbatchGetItemAsync(final BatchGetItemRequest batchGetItemRequest
            throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<BatchGetItemResult>() {
            public BatchGetItemResult call() throws Exception {
                return batchGetItem(batchGetItemRequest);
        }
    });
    }

    

The BatchGetItem operation returns the attributes of one or more items from one or more tables. You identify requested items by primary key.

A single operation can retrieve up to 16 MB of data, which can contain as many as 100 items. BatchGetItem will return a partial result if the response size limit is exceeded, the table's provisioned throughput is exceeded, or an internal processing failure occurs. If a partial result is returned, the operation returns a value for UnprocessedKeys . You can use this value to retry the operation starting with the next item to get.

For example, if you ask to retrieve 100 items, but each individual item is 300 KB in size, the system returns 52 items (so as not to exceed the 16 MB limit). It also returns an appropriate UnprocessedKeys value so you can get the next page of results. If desired, your application can include its own logic to assemble the pages of results into one data set.

If none of the items can be processed due to insufficient provisioned throughput on all of the tables in the request, then BatchGetItem will return a ProvisionedThroughputExceededException . If at least one of the items is successfully processed, then BatchGetItem completes successfully, while returning the keys of the unread items in UnprocessedKeys .

IMPORTANT: If DynamoDB returns any unprocessed items, you should retry the batch operation on those items. However, we strongly recommend that you use an exponential backoff algorithm. If you retry the batch operation immediately, the underlying read or write requests can still fail due to throttling on the individual tables. If you delay the batch operation using exponential backoff, the individual requests in the batch are much more likely to succeed. For more information, see Batch Operations and Error Handling in the Amazon DynamoDB Developer Guide.

By default, BatchGetItem performs eventually consistent reads on every table in the request. If you want strongly consistent reads instead, you can set ConsistentRead to true for any or all tables.

In order to minimize response latency, BatchGetItem retrieves items in parallel.

When designing your application, keep in mind that DynamoDB does not return attributes in any particular order. To help parse the response by item, include the primary key values for the items in your request in the AttributesToGet parameter.

If a requested item does not exist, it is not returned in the result. Requests for nonexistent items consume the minimum read capacity units according to the type of read. For more information, see Capacity Units Calculations in the Amazon DynamoDB Developer Guide .

Parameters:
batchGetItemRequest Container for the necessary parameters to execute the BatchGetItem operation on AmazonDynamoDBv2.
asyncHandler Asynchronous callback handler for events in the life-cycle of the request. Users could provide the implementation of the four callback methods in this interface to process the operation result or handle the exception.
Returns:
A Java Future object containing the response from the BatchGetItem service method, as returned by AmazonDynamoDBv2.
Throws:
com.amazonaws.AmazonClientException If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonDynamoDBv2 indicating either a problem with the data in the request, or a server side issue.
            final BatchGetItemRequest batchGetItemRequest,
            final AsyncHandler<BatchGetItemRequestBatchGetItemResultasyncHandler)
                    throws AmazonServiceExceptionAmazonClientException {
        return .submit(new Callable<BatchGetItemResult>() {
            public BatchGetItemResult call() throws Exception {
              BatchGetItemResult result;
                try {
                result = batchGetItem(batchGetItemRequest);
              } catch (Exception ex) {
                  asyncHandler.onError(ex);
            throw ex;
              }
              asyncHandler.onSuccess(batchGetItemRequestresult);
                 return result;
        }
    });
    }
    
}
        
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