content: /**
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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.activemq.transport.udp;
  
  import java.nio.ByteBuffer;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * A default implementation of {@link SimpleBufferPool} which keeps a pool of direct
   * byte buffers.
   */
  public class DefaultBufferPool extends SimpleBufferPool implements ByteBufferPool {
  
      private List<ByteBuffer> buffers = new ArrayList<ByteBuffer>();
      private Object lock = new Object();
  
      public DefaultBufferPool() {
          super(true);
      }
  
      public DefaultBufferPool(boolean useDirect) {
          super(useDirect);
      }
  
      @Override
      public synchronized ByteBuffer borrowBuffer() {
          synchronized (lock) {
              int size = buffers.size();
              if (size > 0) {
                  return buffers.remove(size - 1);
              }
          }
          return createBuffer();
      }
  
      @Override
      public void returnBuffer(ByteBuffer buffer) {
          synchronized (lock) {
              buffers.add(buffer);
          }
      }
  
      @Override
      public void start() throws Exception {
      }
  
      @Override
      public void stop() throws Exception {
          synchronized (lock) {
              /*
               * for (Iterator iter = buffers.iterator(); iter.hasNext();) {
               * ByteBuffer buffer = (ByteBuffer) iter.next(); }
               */
              buffers.clear();
          }
      }
  }
  