1 /* 2 * Copyright (C) 2007 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.eventbus; 18 19 import com.google.common.collect.Multimap; 20 21 /** 22 * A method for finding event handler methods in objects, for use by 23 * {@link EventBus}. 24 * 25 * @author Cliff Biffle 26 */ 27 interface HandlerFindingStrategy { 28 29 /** 30 * Finds all suitable event handler methods in {@code source}, organizes them 31 * by the type of event they handle, and wraps them in {@link EventHandler}s. 32 * 33 * @param source object whose handlers are desired. 34 * @return EventHandler objects for each handler method, organized by event 35 * type. 36 * 37 * @throws IllegalArgumentException if {@code source} is not appropriate for 38 * this strategy (in ways that this interface does not define). 39 */ findAllHandlers(Object source)40 Multimap<Class<?>, EventHandler> findAllHandlers(Object source); 41 42 } 43