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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.datapipeline;
 
Interface for accessing DataPipeline.

AWS Data Pipeline configures and manages a data-driven workflow called a pipeline. AWS Data Pipeline handles the details of scheduling and ensuring that data dependencies are met so that your application can focus on processing the data.

AWS Data Pipeline provides a JAR implementation of a task runner called AWS Data Pipeline Task Runner. AWS Data Pipeline Task Runner provides logic for common data management scenarios, such as performing database queries and running data analysis using Amazon Elastic MapReduce (Amazon EMR). You can use AWS Data Pipeline Task Runner as your task runner, or you can write your own task runner to provide custom data management.

AWS Data Pipeline implements two main sets of functionality. Use the first set to create a pipeline and define data sources, schedules, dependencies, and the transforms to be performed on the data. Use the second set in your task runner application to receive the next task ready for processing. The logic for performing the task, such as querying the data, running data analysis, or converting the data from one format to another, is contained within the task runner. The task runner performs the task assigned to it by the web service, reporting progress to the web service as it does so. When the task is done, the task runner reports the final success or failure of the task to the web service.

 
 public interface DataPipeline {

    
Overrides the default endpoint for this client ("datapipeline.us-east-1.amazonaws.com"). Callers can use this method to control which AWS region they want to work with.

Callers can pass in just the endpoint (ex: "datapipeline.us-east-1.amazonaws.com") or a full URL, including the protocol (ex: "datapipeline.us-east-1.amazonaws.com"). If the protocol is not specified here, the default protocol from this client's com.amazonaws.ClientConfiguration will be used, which by default is HTTPS.

For more information on using AWS regions with the AWS SDK for Java, and a complete list of all available endpoints for all AWS services, see: http://developer.amazonwebservices.com/connect/entry.jspa?externalID=3912

This method is not threadsafe. An endpoint should be configured when the client is created and before any service requests are made. Changing it afterwards creates inevitable race conditions for any service requests in transit or retrying.

Parameters:
endpoint The endpoint (ex: "datapipeline.us-east-1.amazonaws.com") or a full URL, including the protocol (ex: "datapipeline.us-east-1.amazonaws.com") of the region specific AWS endpoint this client will communicate with.
Throws:
java.lang.IllegalArgumentException If any problems are detected with the specified endpoint.
 
     public void setEndpoint(String endpointthrows java.lang.IllegalArgumentException;

    
An alternative to setEndpoint(java.lang.String), sets the regional endpoint for this client's service calls. Callers can use this method to control which AWS region they want to work with.

By default, all service endpoints in all regions use the https protocol. To use http instead, specify it in the com.amazonaws.ClientConfiguration supplied at construction.

This method is not threadsafe. A region should be configured when the client is created and before any service requests are made. Changing it afterwards creates inevitable race conditions for any service requests in transit or retrying.

    public void setRegion(Region regionthrows java.lang.IllegalArgumentException;
    
    

Validates the specified pipeline and starts processing pipeline tasks. If the pipeline does not pass validation, activation fails.

If you need to pause the pipeline to investigate an issue with a component, such as a data source or script, call DeactivatePipeline.

To activate a finished pipeline, modify the end date for the pipeline and then activate it.

Parameters:
activatePipelineRequest Container for the necessary parameters to execute the ActivatePipeline service method on DataPipeline.
Returns:
The response from the ActivatePipeline service method, as returned by DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.PipelineNotFoundException
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
com.amazonaws.services.datapipeline.model.PipelineDeletedException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
    public ActivatePipelineResult activatePipeline(ActivatePipelineRequest activatePipelineRequest
            throws AmazonServiceExceptionAmazonClientException;

    

Lists the pipeline identifiers for all active pipelines that you have permission to access.

Parameters:
listPipelinesRequest Container for the necessary parameters to execute the ListPipelines service method on DataPipeline.
Returns:
The response from the ListPipelines service method, as returned by DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
    public ListPipelinesResult listPipelines(ListPipelinesRequest listPipelinesRequest
            throws AmazonServiceExceptionAmazonClientException;

    

Task runners call ReportTaskProgress when assigned a task to acknowledge that it has the task. If the web service does not receive this acknowledgement within 2 minutes, it assigns the task in a subsequent PollForTask call. After this initial acknowledgement, the task runner only needs to report progress every 15 minutes to maintain its ownership of the task. You can change this reporting time from 15 minutes by specifying a reportProgressTimeout field in your pipeline.

If a task runner does not report its status after 5 minutes, AWS Data Pipeline assumes that the task runner is unable to process the task and reassigns the task in a subsequent response to PollForTask. Task runners should call ReportTaskProgress every 60 seconds.

Parameters:
reportTaskProgressRequest Container for the necessary parameters to execute the ReportTaskProgress service method on DataPipeline.
Returns:
The response from the ReportTaskProgress service method, as returned by DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.PipelineNotFoundException
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
com.amazonaws.services.datapipeline.model.TaskNotFoundException
com.amazonaws.services.datapipeline.model.PipelineDeletedException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
    public ReportTaskProgressResult reportTaskProgress(ReportTaskProgressRequest reportTaskProgressRequest
            throws AmazonServiceExceptionAmazonClientException;

    

Task runners call PollForTask to receive a task to perform from AWS Data Pipeline. The task runner specifies which tasks it can perform by setting a value for the workerGroup parameter. The task returned can come from any of the pipelines that match the workerGroup value passed in by the task runner and that was launched using the IAM user credentials specified by the task runner.

If tasks are ready in the work queue, PollForTask returns a response immediately. If no tasks are available in the queue, PollForTask uses long-polling and holds on to a poll connection for up to a 90 seconds, during which time the first newly scheduled task is handed to the task runner. To accomodate this, set the socket timeout in your task runner to 90 seconds. The task runner should not call PollForTask again on the same workerGroup until it receives a response, and this can take up to 90 seconds.

Parameters:
pollForTaskRequest Container for the necessary parameters to execute the PollForTask service method on DataPipeline.
Returns:
The response from the PollForTask service method, as returned by DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
com.amazonaws.services.datapipeline.model.TaskNotFoundException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
    public PollForTaskResult pollForTask(PollForTaskRequest pollForTaskRequest
            throws AmazonServiceExceptionAmazonClientException;

    

Validates the specified pipeline definition to ensure that it is well formed and can be run without error.

Parameters:
validatePipelineDefinitionRequest Container for the necessary parameters to execute the ValidatePipelineDefinition service method on DataPipeline.
Returns:
The response from the ValidatePipelineDefinition service method, as returned by DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.PipelineNotFoundException
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
com.amazonaws.services.datapipeline.model.PipelineDeletedException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
            throws AmazonServiceExceptionAmazonClientException;

    

Queries the specified pipeline for the names of objects that match the specified set of conditions.

Parameters:
queryObjectsRequest Container for the necessary parameters to execute the QueryObjects service method on DataPipeline.
Returns:
The response from the QueryObjects service method, as returned by DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.PipelineNotFoundException
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
com.amazonaws.services.datapipeline.model.PipelineDeletedException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
    public QueryObjectsResult queryObjects(QueryObjectsRequest queryObjectsRequest
            throws AmazonServiceExceptionAmazonClientException;

    

Requests that the status of the specified physical or logical pipeline objects be updated in the specified pipeline. This update might not occur immediately, but is eventually consistent. The status that can be set depends on the type of object (for example, DataNode or Activity). You cannot perform this operation on FINISHED pipelines and attempting to do so returns InvalidRequestException .

Parameters:
setStatusRequest Container for the necessary parameters to execute the SetStatus service method on DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.PipelineNotFoundException
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
com.amazonaws.services.datapipeline.model.PipelineDeletedException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
    public void setStatus(SetStatusRequest setStatusRequest
            throws AmazonServiceExceptionAmazonClientException;

    

Deletes a pipeline, its pipeline definition, and its run history. AWS Data Pipeline attempts to cancel instances associated with the pipeline that are currently being processed by task runners.

Deleting a pipeline cannot be undone. You cannot query or restore a deleted pipeline. To temporarily pause a pipeline instead of deleting it, call SetStatus with the status set to PAUSE on individual components. Components that are paused by SetStatus can be resumed.

Parameters:
deletePipelineRequest Container for the necessary parameters to execute the DeletePipeline service method on DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.PipelineNotFoundException
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
    public void deletePipeline(DeletePipelineRequest deletePipelineRequest
            throws AmazonServiceExceptionAmazonClientException;

    

Deactivates the specified running pipeline. The pipeline is set to the DEACTIVATING state until the deactivation process completes.

To resume a deactivated pipeline, use ActivatePipeline. By default, the pipeline resumes from the last completed execution. Optionally, you can specify the date and time to resume the pipeline.

Parameters:
deactivatePipelineRequest Container for the necessary parameters to execute the DeactivatePipeline service method on DataPipeline.
Returns:
The response from the DeactivatePipeline service method, as returned by DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.PipelineNotFoundException
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
com.amazonaws.services.datapipeline.model.PipelineDeletedException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
    public DeactivatePipelineResult deactivatePipeline(DeactivatePipelineRequest deactivatePipelineRequest
            throws AmazonServiceExceptionAmazonClientException;

    

Gets the definition of the specified pipeline. You can call GetPipelineDefinition to retrieve the pipeline definition that you provided using PutPipelineDefinition.

Parameters:
getPipelineDefinitionRequest Container for the necessary parameters to execute the GetPipelineDefinition service method on DataPipeline.
Returns:
The response from the GetPipelineDefinition service method, as returned by DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.PipelineNotFoundException
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
com.amazonaws.services.datapipeline.model.PipelineDeletedException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
            throws AmazonServiceExceptionAmazonClientException;

    

Task runners call SetTaskStatus to notify AWS Data Pipeline that a task is completed and provide information about the final status. A task runner makes this call regardless of whether the task was sucessful. A task runner does not need to call SetTaskStatus for tasks that are canceled by the web service during a call to ReportTaskProgress.

Parameters:
setTaskStatusRequest Container for the necessary parameters to execute the SetTaskStatus service method on DataPipeline.
Returns:
The response from the SetTaskStatus service method, as returned by DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.PipelineNotFoundException
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
com.amazonaws.services.datapipeline.model.TaskNotFoundException
com.amazonaws.services.datapipeline.model.PipelineDeletedException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
    public SetTaskStatusResult setTaskStatus(SetTaskStatusRequest setTaskStatusRequest
            throws AmazonServiceExceptionAmazonClientException;

    

Task runners call EvaluateExpression to evaluate a string in the context of the specified object. For example, a task runner can evaluate SQL queries stored in Amazon S3.

Parameters:
evaluateExpressionRequest Container for the necessary parameters to execute the EvaluateExpression service method on DataPipeline.
Returns:
The response from the EvaluateExpression service method, as returned by DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.PipelineNotFoundException
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
com.amazonaws.services.datapipeline.model.TaskNotFoundException
com.amazonaws.services.datapipeline.model.PipelineDeletedException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
    public EvaluateExpressionResult evaluateExpression(EvaluateExpressionRequest evaluateExpressionRequest
            throws AmazonServiceExceptionAmazonClientException;

    

Retrieves metadata about one or more pipelines. The information retrieved includes the name of the pipeline, the pipeline identifier, its current state, and the user account that owns the pipeline. Using account credentials, you can retrieve metadata about pipelines that you or your IAM users have created. If you are using an IAM user account, you can retrieve metadata about only those pipelines for which you have read permissions.

To retrieve the full pipeline definition instead of metadata about the pipeline, call GetPipelineDefinition.

Parameters:
describePipelinesRequest Container for the necessary parameters to execute the DescribePipelines service method on DataPipeline.
Returns:
The response from the DescribePipelines service method, as returned by DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.PipelineNotFoundException
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
com.amazonaws.services.datapipeline.model.PipelineDeletedException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
    public DescribePipelinesResult describePipelines(DescribePipelinesRequest describePipelinesRequest
            throws AmazonServiceExceptionAmazonClientException;

    

Creates a new, empty pipeline. Use PutPipelineDefinition to populate the pipeline.

Parameters:
createPipelineRequest Container for the necessary parameters to execute the CreatePipeline service method on DataPipeline.
Returns:
The response from the CreatePipeline service method, as returned by DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
    public CreatePipelineResult createPipeline(CreatePipelineRequest createPipelineRequest
            throws AmazonServiceExceptionAmazonClientException;

    

Gets the object definitions for a set of objects associated with the pipeline. Object definitions are composed of a set of fields that define the properties of the object.

Parameters:
describeObjectsRequest Container for the necessary parameters to execute the DescribeObjects service method on DataPipeline.
Returns:
The response from the DescribeObjects service method, as returned by DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.PipelineNotFoundException
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
com.amazonaws.services.datapipeline.model.PipelineDeletedException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
    public DescribeObjectsResult describeObjects(DescribeObjectsRequest describeObjectsRequest
            throws AmazonServiceExceptionAmazonClientException;

    

Removes existing tags from the specified pipeline.

Parameters:
removeTagsRequest Container for the necessary parameters to execute the RemoveTags service method on DataPipeline.
Returns:
The response from the RemoveTags service method, as returned by DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.PipelineNotFoundException
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
com.amazonaws.services.datapipeline.model.PipelineDeletedException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
    public RemoveTagsResult removeTags(RemoveTagsRequest removeTagsRequest
            throws AmazonServiceExceptionAmazonClientException;

    

Task runners call ReportTaskRunnerHeartbeat every 15 minutes to indicate that they are operational. If the AWS Data Pipeline Task Runner is launched on a resource managed by AWS Data Pipeline, the web service can use this call to detect when the task runner application has failed and restart a new instance.

Parameters:
reportTaskRunnerHeartbeatRequest Container for the necessary parameters to execute the ReportTaskRunnerHeartbeat service method on DataPipeline.
Returns:
The response from the ReportTaskRunnerHeartbeat service method, as returned by DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
            throws AmazonServiceExceptionAmazonClientException;

    

Adds or modifies tags for the specified pipeline.

Parameters:
addTagsRequest Container for the necessary parameters to execute the AddTags service method on DataPipeline.
Returns:
The response from the AddTags service method, as returned by DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.PipelineNotFoundException
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
com.amazonaws.services.datapipeline.model.PipelineDeletedException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
    public AddTagsResult addTags(AddTagsRequest addTagsRequest
            throws AmazonServiceExceptionAmazonClientException;

    

Adds tasks, schedules, and preconditions to the specified pipeline. You can use PutPipelineDefinition to populate a new pipeline.

PutPipelineDefinition also validates the configuration as it adds it to the pipeline. Changes to the pipeline are saved unless one of the following three validation errors exists in the pipeline.

  1. An object is missing a name or identifier field.
  2. A string or reference field is empty.
  3. The number of objects in the pipeline exceeds the maximum allowed objects.
  4. The pipeline is in a FINISHED state.

Pipeline object definitions are passed to the PutPipelineDefinition action and returned by the GetPipelineDefinition action.

Parameters:
putPipelineDefinitionRequest Container for the necessary parameters to execute the PutPipelineDefinition service method on DataPipeline.
Returns:
The response from the PutPipelineDefinition service method, as returned by DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.PipelineNotFoundException
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
com.amazonaws.services.datapipeline.model.PipelineDeletedException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
            throws AmazonServiceExceptionAmazonClientException;

    

Lists the pipeline identifiers for all active pipelines that you have permission to access.

Returns:
The response from the ListPipelines service method, as returned by DataPipeline.
Throws:
com.amazonaws.services.datapipeline.model.InternalServiceErrorException
com.amazonaws.services.datapipeline.model.InvalidRequestException
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 DataPipeline indicating either a problem with the data in the request, or a server side issue.
Shuts down this client object, releasing any resources that might be held open. This is an optional method, and callers are not expected to call it, but can if they want to explicitly release any open resources. Once a client has been shutdown, it should not be used to make any more requests.
    public void shutdown();
    
    
Returns additional metadata for a previously executed successful request, typically used for debugging issues where a service isn't acting as expected. This data isn't considered part of the result data returned by an operation, so it's available through this separate, diagnostic interface.

Response metadata is only cached for a limited period of time, so if you need to access this extra diagnostic information for an executed request, you should use this method to retrieve it as soon as possible after executing a request.

Parameters:
request The originally executed request.
Returns:
The response metadata for the specified request, or null if none is available.
}
        
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