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  /*
   * Copyright 2011-2015 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.http;
 
 import java.net.URI;
 import java.util.List;
 
 
 
 public class ExecutionContext {
     private final AWSRequestMetrics awsRequestMetrics;
     private final List<RequestHandler2requestHandler2s;
     private String contextUserAgent;
     private final AmazonWebServiceClient awsClient;

    
Optional credentials to enable the runtime layer to handle signing requests (and resigning on retries).
 
     private AWSCredentials credentials;

    
An internal retry strategy for auth errors. This is currently only used by the S3 client for auto-resolving V4-required regions.
 
For testing purposes.
 
     public ExecutionContext(boolean isMetricEnabled) {
         this(nullisMetricEnablednull);
     }
    
For testing purposes.
 
     public ExecutionContext() { this(nullfalsenull); }
 
     public ExecutionContext(List<RequestHandler2requestHandler2s,
                             boolean isMetricEnabled,
                             AmazonWebServiceClient awsClient) {
         this. = requestHandler2s;
          = isMetricEnabled
                           ? new AWSRequestMetricsFullSupport()
                           : new AWSRequestMetrics();
         this. = awsClient;
     }
 
     public String getContextUserAgent() {
         return ;
     }
 
     public void setContextUserAgent(String contextUserAgent) {
         this. = contextUserAgent;
     }
 
     public List<RequestHandler2getRequestHandler2s() {
         return ;
     }
 
         return ;
     }
 
     protected AmazonWebServiceClient getAwsClient() {
         return ;
     }

    
There is in general no need to set the signer in the execution context, since the signer for each request may differ depending on the URI of the request. The exception is S3 where the signer is currently determined only when the S3 client is constructed. Hence the need for this method. We may consider supporting a per request level signer determination for S3 later on.
 
     public void setSigner(Signer signer) {}

    
Returns the signer for the given uri. Note S3 in particular overrides this method.
 
     public Signer getSignerByURI(URI uri) {
         return  == null ? null : .getSignerByURI(uri);
    }

    
Returns the optional credentials used to sign the associated request.

Returns:
The optional credentials used to sign the associated request.
    public AWSCredentials getCredentials() {
        return ;
    }

    
Sets the optional credentials used to sign the associated request. If no credentials are specified as part of a request's ExecutionContext, then the runtime layer will not attempt to sign (or resign on retries) requests.

Parameters:
credentials The optional credentials used to sign the associated request.
    public void setCredentials(AWSCredentials credentials) {
        this. = credentials;
    }

    
Returns the retry strategy for auth errors. This is currently only used by the S3 client for auto-resolving sigv4-required regions.

Note that this will be checked BEFORE the HTTP client consults the user-specified RetryPolicy. i.e. if the configured AuthErrorRetryStrategy says the request should be retried, the retry will be performed internally and the effect is transparent to the user's RetryPolicy.

        return ;
    }

    
Sets the optional auth error retry strategy for this request execution.

    public void setAuthErrorRetryStrategy(
            AuthErrorRetryStrategy authErrorRetryStrategy) {
        this. = authErrorRetryStrategy;
    }
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