/**
* 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.TransportLogger;
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.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class UdpTransportFactory extends TransportFactory {
private static final Log log = LogFactory.getLog(TcpTransportFactory.class);
public TransportServer doBind(String brokerId, final URI location) throws IOException {
try {
Map<String, String> options = new HashMap<String, String>(URISupport.parseParamters(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 = new UdpTransport(openWireFormat, port);
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()) {
transport = new TransportLogger(transport);
}
transport = new InactivityMonitor(transport);
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 = new TransportLogger(transport);
}
transport = new InactivityMonitor(transport);
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;
}
}