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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.annotations;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import com.amazonaws.services.simpleworkflow.flow.core.Promise;
import com.amazonaws.services.simpleworkflow.flow.core.TryCatchFinally;

/**
 * Call to @Asynchronous method always returns immediately without executing it
 * code. Method body is scheduled for execution after all parameters that extend
 * {@link Promise} and not marked with {@link NoWait} are ready. The only valid
 * return types for @Asynchronous method are void and
 * {@link Promise}.
 * 
 * @author fateev
 */
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Asynchronous {

    /**
     * if set to true treats asynchronous task as a daemon task, allowing the
     * parent asynchronous scope to close if all non-daemon child tasks
     * completes. Default is false which means use the value of the
     * parent task. See {@link TryCatchFinally} for more info on daemon
     * semantic.
     */
    boolean daemon() default false;
}