com.amazonaws.services.simpleworkflow.flow.worker.CurrentActivityExecutionContext Maven / Gradle / Ivy

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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 2012-2014 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.services.simpleworkflow.flow.worker;

import com.amazonaws.services.simpleworkflow.flow.ActivityExecutionContext;
import com.amazonaws.services.simpleworkflow.flow.ActivityExecutionContextProviderImpl;

/**
 * Thread local store of the context object passed to an activity
 * implementation. Avoid using this class directly. Use
 * {@link ActivityExecutionContextProviderImpl} instead.
 * 
 * @author fateev
 */
public class CurrentActivityExecutionContext {

    private final static ThreadLocal CURRENT = new ThreadLocal();

    /**
     * This is used by activity implementation to get access to the current
     * ActivityExecutionContext
     */
    public static ActivityExecutionContext get() {
        ActivityExecutionContext result = CURRENT.get();
        if (result == null) {
            throw new IllegalStateException("ActivityExecutionContext can be used only inside of acitivty implementation methods");
        }
        return result;
    };

    public static boolean isSet() {
        return CURRENT.get() != null;
    }

    public static void set(ActivityExecutionContext context) {
        if (context == null) {
            throw new IllegalArgumentException("null context");
        }
        CURRENT.set(context);
    }

    public static void unset() {
        CURRENT.set(null);
    }

    private CurrentActivityExecutionContext() {

    }
}