001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.geronimo.kernel.util; 018 019 import java.util.List; 020 import java.lang.ref.WeakReference; 021 import java.util.ArrayList; 022 023 024 public class ClassLoaderRegistry { 025 private final static List<WeakReference> list = new ArrayList<WeakReference>(); 026 027 public synchronized static List getList(){ 028 List<ClassLoader> ret = new ArrayList<ClassLoader>(); 029 for(int i=0;i<list.size();i++) 030 if(list.get(i) != null) { 031 ret.add((ClassLoader)list.get(i).get()); 032 } 033 else { 034 list.remove(i); 035 } 036 return ret; 037 } 038 039 public synchronized static boolean add(ClassLoader cloader){ 040 if(contains(cloader)) { 041 return false; 042 } 043 return list.add(new WeakReference<ClassLoader>(cloader)); 044 } 045 046 public synchronized static boolean contains(ClassLoader cloader){ 047 for(int i=0;i<list.size();i++) { 048 WeakReference wk = list.get(i); 049 if(wk.get() == null) { 050 list.remove(i); 051 } 052 else if(wk.get().equals(cloader)) 053 return true; 054 } 055 return false; 056 } 057 058 public synchronized static boolean remove(ClassLoader cloader){ 059 boolean result = false; 060 for(int i=0;i<list.size();i++){ 061 WeakReference wk = list.get(i); 062 if(wk.get() == null)list.remove(i); 063 else if(wk.get().equals(cloader)){ 064 list.remove(i); 065 result = true; 066 } 067 } 068 return result; 069 } 070 }