/*
* Copyright (C) 2007 The Guava 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 com.google.common.eventbus;
import com.google.common.annotations.Beta;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* Marks a method as an event subscriber.
*
* <p>The type of event will be indicated by the method's first (and only) parameter. If this
* annotation is applied to methods with zero parameters, or more than one parameter, the object
* containing the method will not be able to register for event delivery from the {@link EventBus}.
*
* <p>Unless also annotated with @{@link AllowConcurrentEvents}, event subscriber methods will be
* invoked serially by each event bus that they are registered with.
*
* @author Cliff Biffle
* @since 10.0
*/
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
@Beta
public @interface Subscribe {}