trunk/activemq-core/src/test/java/org/apache/activemq/transport/reliable/UnreliableCommandDatagramChannel.java

/**
 * 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;
    }

    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);
        }
    }
}