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The source code/* * Copyright 1999-2004 The Apache Sofware Foundation. * * 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.apache.tomcat.util.hooks; import java.util.Vector; /** Hooks support. Hooks implement a chain-of-command pattern, and * are commonly used in most web servers as a mechanism of extensibility. * * This class doesn't deal with hook invocation - the program is expected * to use interfaces or base classes with the hooks beeing methods that * are invoked. Reflection-based invocation is very expensive and shouldn't * be used. * * The Hooks class will provide support for registering and maintaining * a list of modules implementing each hook. * * The module can be added automatically to the right lists by using * introspection ( if the module implements a certain method, it'll * be added to the chain for the hook with the same name ). It is also * possible for a module to explicitely register hooks. * * This class is modeled after Apache2.0 hooks - most web servers are using * this pattern, but so far A2.0 has the most flexible and powerfull * implementation */ public class Hooks { static org.apache.commons.logging.Log logger = org.apache.commons.logging.LogFactory.getLog(Hooks.class); public static final int INITIAL_HOOKS=24; int hookCount; String hookNames[]; Vector hooksV[]; Object hooks[][]; Vector allModulesV; Object allModules[]; private static final int dL=0; public Hooks() { this.hookCount=INITIAL_HOOKS; // XXX TODO: resizing hooksV=new Vector[hookCount]; for( int i=0; i |
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