/* * Copyright 2012 NGDATA nv * * 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.lilyproject.plugin; /** * Interface to be implemented by the user of a particular * type of plugin. * * <p>The {@link #pluginAdded} and {@link #pluginRemoved} methods will * never be called concurrently by multiple threads. */ public interface PluginUser<T> { /** * Notification of an available plugin. * * <p>Plugin users can be guaranteed that there won't be two * plugins registred with the same name (unless previously removed via * {@link #pluginRemoved}. The name also won't be null, an empty string, * or a whitespace string. */ void pluginAdded(PluginHandle<T> pluginHandle); void pluginRemoved(PluginHandle<T> pluginHandle); }