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