/*
* Copyright 2015-2016 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License 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 org.springframework.statemachine.annotation;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.util.Map;
import org.springframework.messaging.Message;
import org.springframework.statemachine.ExtendedState;
import org.springframework.statemachine.StateMachine;
/**
* Indicates that a method is candidate to be called when {@link ExtendedState}
* is changed.
* <p>
* A method annotated with @OnExtendedStateChanged may accept a parameter of type
* {@link ExtendedState}, {@link Map} if map argument itself is annotated
* with {@link EventHeaders}, {@link StateMachine}, {@link Message} or {@link Exception}.
* <p>
* Return value can be anything and is effectively discarded.
*
* @author Janne Valkealahti
*
*/
@Target({ ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
@Inherited
@Documented
public @interface OnExtendedStateChanged {
/**
* The extended state variable keys.
*
* @return The extended state variable keys
*/
String[] key() default {};
}