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The Amazon Web Services 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 2010-2014 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.protocol;

import java.io.IOException;

import org.apache.http.HttpClientConnection;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.HttpRequestExecutor;

import com.amazonaws.util.AWSRequestMetrics;
import com.amazonaws.util.AWSRequestMetrics.Field;

/**
 * Used to capture the http send-request and receive-response latency metrics
 * of the http client library, with no retries involved.
 */
public class SdkHttpRequestExecutor extends HttpRequestExecutor {
    @Override
    protected HttpResponse doSendRequest(
            final HttpRequest request,
            final HttpClientConnection conn,
            final HttpContext context)
                throws IOException, HttpException {
        AWSRequestMetrics awsRequestMetrics = (AWSRequestMetrics) context
                .getAttribute(AWSRequestMetrics.class.getSimpleName());
        if (awsRequestMetrics == null) {
            return super.doSendRequest(request, conn, context);
        }
        awsRequestMetrics.startEvent(Field.HttpClientSendRequestTime);
        try {
            return super.doSendRequest(request, conn, context);
        } finally {
            awsRequestMetrics.endEvent(Field.HttpClientSendRequestTime);
        }
    }

    @Override
    protected HttpResponse doReceiveResponse(
            final HttpRequest          request,
            final HttpClientConnection conn,
            final HttpContext          context)
                throws HttpException, IOException {
        AWSRequestMetrics awsRequestMetrics = (AWSRequestMetrics) context
                .getAttribute(AWSRequestMetrics.class.getSimpleName());
        if (awsRequestMetrics == null) {
            return super.doReceiveResponse(request, conn, context);
        }
        awsRequestMetrics.startEvent(Field.HttpClientReceiveResponseTime);
        try {
            return super.doReceiveResponse(request, conn, context);
        } finally {
            awsRequestMetrics.endEvent(Field.HttpClientReceiveResponseTime);
        }
    }
}