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.reliable;
  
  import java.io.IOException;
  import java.net.SocketAddress;
  import java.nio.ByteBuffer;
  import java.nio.channels.DatagramChannel;
  
  import org.apache.activemq.openwire.OpenWireFormat;
  import org.apache.activemq.transport.udp.ByteBufferPool;
  import org.apache.activemq.transport.udp.CommandDatagramChannel;
  import org.apache.activemq.transport.udp.DatagramHeaderMarshaller;
  import org.apache.activemq.transport.udp.UdpTransport;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class UnreliableCommandDatagramChannel extends CommandDatagramChannel {
  
     private static final Logger LOG = LoggerFactory.getLogger(UnreliableCommandDatagramChannel.class);
  
     private DropCommandStrategy dropCommandStrategy;
  
     public UnreliableCommandDatagramChannel(UdpTransport transport,
                                             OpenWireFormat wireFormat,
                                             int datagramSize,
                                             SocketAddress targetAddress,
                                             DatagramHeaderMarshaller headerMarshaller,
                                             ReplayBuffer replayBuffer,
                                             DatagramChannel channel,
                                             ByteBufferPool bufferPool,
                                             DropCommandStrategy strategy) {
        super(transport, wireFormat, datagramSize, targetAddress, headerMarshaller, channel, bufferPool);
        this.dropCommandStrategy = strategy;
     }
  
     @Override
     protected void sendWriteBuffer(int commandId,
                                    SocketAddress address,
                                    ByteBuffer writeBuffer,
                                    boolean redelivery) throws IOException {
        if (dropCommandStrategy.shouldDropCommand(commandId, address, redelivery)) {
           writeBuffer.flip();
           LOG.info("Dropping datagram with command: " + commandId);
  
           // lets still add it to the replay buffer though!
           getReplayBuffer().addBuffer(commandId, writeBuffer);
        } else {
           super.sendWriteBuffer(commandId, address, writeBuffer, redelivery);
        }
     }
  }
  