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 */ 017package org.apache.activemq.transport.udp; 018 019import java.nio.ByteBuffer; 020import java.util.ArrayList; 021import java.util.List; 022 023/** 024 * A default implementation of {@link SimpleBufferPool} which keeps a pool of direct 025 * byte buffers. 026 */ 027public class DefaultBufferPool extends SimpleBufferPool implements ByteBufferPool { 028 029 private List<ByteBuffer> buffers = new ArrayList<ByteBuffer>(); 030 private Object lock = new Object(); 031 032 public DefaultBufferPool() { 033 super(true); 034 } 035 036 public DefaultBufferPool(boolean useDirect) { 037 super(useDirect); 038 } 039 040 @Override 041 public synchronized ByteBuffer borrowBuffer() { 042 synchronized (lock) { 043 int size = buffers.size(); 044 if (size > 0) { 045 return buffers.remove(size - 1); 046 } 047 } 048 return createBuffer(); 049 } 050 051 @Override 052 public void returnBuffer(ByteBuffer buffer) { 053 synchronized (lock) { 054 buffers.add(buffer); 055 } 056 } 057 058 @Override 059 public void start() throws Exception { 060 } 061 062 @Override 063 public void stop() throws Exception { 064 synchronized (lock) { 065 /* 066 * for (Iterator iter = buffers.iterator(); iter.hasNext();) { 067 * ByteBuffer buffer = (ByteBuffer) iter.next(); } 068 */ 069 buffers.clear(); 070 } 071 } 072}