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The AWS SDK for Java with support for OSGi. The AWS SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2010-2016 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.util;

import com.amazonaws.AmazonClientException;
import com.amazonaws.ResponseMetadata;
import com.amazonaws.annotation.SdkInternalApi;

/**
 * No-op response metadata cache used when a client instance is configured
 * without response metadata caching enabled.
 */
@SdkInternalApi
public class NullResponseMetadataCache implements MetadataCache {

    @Override
    public void add(Object obj, ResponseMetadata metadata) {
        // deliberately left blank
    }

    @Override
    public ResponseMetadata get(Object obj) {
        throw new AmazonClientException("Response metadata caching is not enabled");
    }

}