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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 2015-2016 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.http.conn;

import org.apache.http.HttpResponse;
import org.apache.http.conn.ConnectionKeepAliveStrategy;
import org.apache.http.impl.client.DefaultConnectionKeepAliveStrategy;
import org.apache.http.protocol.HttpContext;

/**
 * The AWS SDK for Java's implementation of the
 * {@code ConnectionKeepAliveStrategy} interface. Allows a user-configurable
 * maximum idle time for connections.
 */
public class SdkConnectionKeepAliveStrategy
        implements ConnectionKeepAliveStrategy {

    private final long maxIdleTime;

    /**
     * @param maxIdleTime the maximum time a connection may be idle
     */
    public SdkConnectionKeepAliveStrategy(long maxIdleTime) {
        this.maxIdleTime = maxIdleTime;
    }

    @Override
    public long getKeepAliveDuration(
            HttpResponse response,
            HttpContext context) {

        // If there's a Keep-Alive timeout directive in the response and it's
        // shorter than our configured max, honor that. Otherwise go with the
        // configured maximum.

        long duration = DefaultConnectionKeepAliveStrategy.INSTANCE
                .getKeepAliveDuration(response, context);

        if (0 < duration && duration < maxIdleTime) {
            return duration;
        }

        return maxIdleTime;
    }
}