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  * Copyright 2014-2015, 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
 * or in the "license" file accompanying this file. This file is distributed
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
public class S3ExecutionContext extends ExecutionContext {
    private static final Log log = LogFactory.getLog(AmazonS3Client.class);
    private Signer signer;
    public S3ExecutionContext(List<RequestHandler2requestHandler2s,
            boolean isMetricEnabledAmazonWebServiceClient awsClient) {
    public void setSigner(Signer signer) {
        this. = signer;

Returns the signer instance that should be used to sign the request sent to the given URL. This method will be called before either the first attempt of an S3 request, or a retry attempt for 307 redirect. In the second case, the URL passed here will be the full redirect location which includes not only the host component, but also the path, query parameters, etc.
    public Signer getSignerByURI(URI uri) {
        // Don't modify the signer region, if the client is configured with region override
        AmazonWebServiceClient awsClient = getAwsClient();
        if (awsClient != null &&
            awsClient.getSignerRegionOverride() != null) {
            return ;
        // Otherwise, parse region name from the host component of the URL and
        // assign it to the signer
        if ( instanceof RegionAwareSigner) {
            RegionAwareSigner regionSigner = (RegionAwareSigner);
            try {
                        uri.getHost(), "s3"));
            } catch (RuntimeException e) {
                .warn("Failed to parse the endpoint " + uri +
                        ", and skip re-assigning the signer region"e);
        return ;
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