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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;

/**
 * Used for clock skew adjustment between the client JVM where the SDK is run,
 * and the server side.
 */
public class SDKGlobalTime {
    /**
     * globalTimeOffset is a time difference in seconds between the running JVM
     * and AWS. Used to globally adjust the client clock skew. Java SDK already
     * provides timeOffset and accessor methods in Request class but
     * those are used per request, whereas this variable will adjust clock skew
     * globally. Java SDK detects clock skew errors and adjusts global clock
     * skew automatically.
     */
    private static volatile int globalTimeOffset;

    /**
     * Sets the global time difference in seconds between the running JVM and
     * AWS. If this value is set then all the subsequent instantiation of an
     * AmazonHttpClient will start using this
     * value to generate timestamps.
     *
     * @param timeOffset
     *            the time difference in seconds between the running JVM and AWS
     */
    public  static void setGlobalTimeOffset(int timeOffset) {
        globalTimeOffset = timeOffset;
    }

    /**
     * Gets the global time difference in seconds between the running JVM and
     * AWS. See Request#getTimeOffset() if global time offset is
     * not set.
     */
    public static int getGlobalTimeOffset() {
        return globalTimeOffset;
    }
}