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ActiveMQ example source code file (UdpTransportFactory.java)

This example ActiveMQ source code file (UdpTransportFactory.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

commandjoiner, exception, io, ioexception, map, net, network, openwireformat, openwireformat, reliabletransport, transport, transport, udptransport, udptransport, uri, util, wireformat, wireformat

The ActiveMQ UdpTransportFactory.java source code

/**
 * 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.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.UnknownHostException;
import java.util.HashMap;
import java.util.Map;

import org.apache.activemq.openwire.OpenWireFormat;
import org.apache.activemq.transport.CommandJoiner;
import org.apache.activemq.transport.InactivityMonitor;
import org.apache.activemq.transport.Transport;
import org.apache.activemq.transport.TransportFactory;
import org.apache.activemq.transport.TransportLoggerFactory;
import org.apache.activemq.transport.TransportServer;
import org.apache.activemq.transport.reliable.DefaultReplayStrategy;
import org.apache.activemq.transport.reliable.ExceptionIfDroppedReplayStrategy;
import org.apache.activemq.transport.reliable.ReliableTransport;
import org.apache.activemq.transport.reliable.ReplayStrategy;
import org.apache.activemq.transport.reliable.Replayer;
import org.apache.activemq.transport.tcp.TcpTransportFactory;
import org.apache.activemq.util.IOExceptionSupport;
import org.apache.activemq.util.IntrospectionSupport;
import org.apache.activemq.util.URISupport;
import org.apache.activemq.wireformat.WireFormat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author David Martin Clavo david(dot)martin(dot)clavo(at)gmail.com (logging improvement modifications)
 * 
 */
public class UdpTransportFactory extends TransportFactory {
    
    private static final Logger log = LoggerFactory.getLogger(TcpTransportFactory.class);
    
    public TransportServer doBind(final URI location) throws IOException {
        try {
            Map<String, String> options = new HashMap(URISupport.parseParameters(location));
            if (options.containsKey("port")) {
                throw new IllegalArgumentException("The port property cannot be specified on a UDP server transport - please use the port in the URI syntax");
            }
            WireFormat wf = createWireFormat(options);
            int port = location.getPort();
            OpenWireFormat openWireFormat = asOpenWireFormat(wf);
            UdpTransport transport = (UdpTransport) createTransport(location, wf);

            Transport configuredTransport = configure(transport, wf, options, true);
            UdpTransportServer server = new UdpTransportServer(location, transport, configuredTransport, createReplayStrategy());
            return server;
        } catch (URISyntaxException e) {
            throw IOExceptionSupport.create(e);
        } catch (Exception e) {
            throw IOExceptionSupport.create(e);
        }
    }

    public Transport configure(Transport transport, WireFormat format, Map options) throws Exception {
        return configure(transport, format, options, false);
    }

    public Transport compositeConfigure(Transport transport, WireFormat format, Map options) {
        IntrospectionSupport.setProperties(transport, options);
        final UdpTransport udpTransport = (UdpTransport)transport;

        // deal with fragmentation
        transport = new CommandJoiner(transport, asOpenWireFormat(format));

        if (udpTransport.isTrace()) {
            try {
                transport = TransportLoggerFactory.getInstance().createTransportLogger(transport);
            } catch (Throwable e) {
                log.error("Could not create TransportLogger object for: " + TransportLoggerFactory.defaultLogWriterName + ", reason: " + e, e);
            }
        }

        transport = new InactivityMonitor(transport, format);

        if (format instanceof OpenWireFormat) {
            transport = configureClientSideNegotiator(transport, format, udpTransport);
        }

        return transport;
    }

    protected Transport createTransport(URI location, WireFormat wf) throws UnknownHostException, IOException {
        OpenWireFormat wireFormat = asOpenWireFormat(wf);
        return new UdpTransport(wireFormat, location);
    }

    /**
     * Configures the transport
     * 
     * @param acceptServer true if this transport is used purely as an 'accept'
     *                transport for new connections which work like TCP
     *                SocketServers where new connections spin up a new separate
     *                UDP transport
     */
    protected Transport configure(Transport transport, WireFormat format, Map options, boolean acceptServer) throws Exception {
        IntrospectionSupport.setProperties(transport, options);
        UdpTransport udpTransport = (UdpTransport)transport;

        OpenWireFormat openWireFormat = asOpenWireFormat(format);

        if (udpTransport.isTrace()) {
            transport = TransportLoggerFactory.getInstance().createTransportLogger(transport);
        }

        transport = new InactivityMonitor(transport, format);

        if (!acceptServer && format instanceof OpenWireFormat) {
            transport = configureClientSideNegotiator(transport, format, udpTransport);
        }

        // deal with fragmentation

        if (acceptServer) {
            // lets not support a buffer of messages to enable reliable
            // messaging on the 'accept server' transport
            udpTransport.setReplayEnabled(false);

            // we don't want to do reliable checks on this transport as we
            // delegate to one that does
            transport = new CommandJoiner(transport, openWireFormat);
            return transport;
        } else {
            ReliableTransport reliableTransport = new ReliableTransport(transport, udpTransport);
            Replayer replayer = reliableTransport.getReplayer();
            reliableTransport.setReplayStrategy(createReplayStrategy(replayer));

            // Joiner must be on outside as the inbound messages must be
            // processed by the reliable transport first
            return new CommandJoiner(reliableTransport, openWireFormat);
        }
    }

    protected ReplayStrategy createReplayStrategy(Replayer replayer) {
        if (replayer != null) {
            return new DefaultReplayStrategy(5);
        }
        return new ExceptionIfDroppedReplayStrategy(1);
    }

    protected ReplayStrategy createReplayStrategy() {
        return new DefaultReplayStrategy(5);
    }

    protected Transport configureClientSideNegotiator(Transport transport, WireFormat format, final UdpTransport udpTransport) {
        return new ResponseRedirectInterceptor(transport, udpTransport);
    }

    protected OpenWireFormat asOpenWireFormat(WireFormat wf) {
        OpenWireFormat answer = (OpenWireFormat)wf;
        return answer;
    }
}

Other ActiveMQ examples (source code examples)

Here is a short list of links related to this ActiveMQ UdpTransportFactory.java source code file:



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