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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;

/**
 * @Execute annotation is used on methods of interface annotated with {@link Workflow} 
 * to specify the entry-point for WorkflowType.  
 * 
 * @Execute method can only have void or {@link Promise} return types.
 * Parameters of type {@link Promise} are not allowed.
 * 
 * @see Workflow, WorkflowWorker
 * @author fateev, samar
 * 
 */
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Execute {

    /**
     * Optional name of the workflow type. When missing defaults to the
     * annotated method name. Maximum length is 256 characters.
     */
    String name() default "";

    /**
     * Required version of the workflow type. Maximum length is 64 characters.
     */
    String version();

}