1 /* 2 * Copyright (C) 2007 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except 5 * in compliance with the License. You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software distributed under the License 10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express 11 * or implied. See the License for the specific language governing permissions and limitations under 12 * the License. 13 */ 14 15 package com.google.common.eventbus; 16 17 import com.google.common.annotations.Beta; 18 import java.lang.annotation.ElementType; 19 import java.lang.annotation.Retention; 20 import java.lang.annotation.RetentionPolicy; 21 import java.lang.annotation.Target; 22 23 /** 24 * Marks a method as an event subscriber. 25 * 26 * <p>The type of event will be indicated by the method's first (and only) parameter, which cannot 27 * be primitive. If this annotation is applied to methods with zero parameters, or more than one 28 * parameter, the object containing the method will not be able to register for event delivery from 29 * the {@link EventBus}. 30 * 31 * <p>Unless also annotated with @{@link AllowConcurrentEvents}, event subscriber methods will be 32 * invoked serially by each event bus that they are registered with. 33 * 34 * @author Cliff Biffle 35 * @since 10.0 36 */ 37 @Retention(RetentionPolicy.RUNTIME) 38 @Target(ElementType.METHOD) 39 @Beta 40 public @interface Subscribe {} 41