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/*
* Copyright (c) 2001-2007 Sun Microsystems, Inc. All rights reserved.
*
* The Sun Project JXTA(TM) Software License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by Sun Microsystems, Inc. for JXTA(TM) technology."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
* not be used to endorse or promote products derived from this software
* without prior written permission. For written permission, please contact
* Project JXTA at http://www.jxta.org.
*
* 5. Products derived from this software may not be called "JXTA", nor may
* "JXTA" appear in their name, without prior written permission of Sun.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SUN
* MICROSYSTEMS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* JXTA is a registered trademark of Sun Microsystems, Inc. in the United
* States and other countries.
*
* Please see the license information page at :
* for instructions on use of
* the license in source files.
*
* ====================================================================
*
* This software consists of voluntary contributions made by many individuals
* on behalf of Project JXTA. For more information on Project JXTA, please see
* http://www.jxta.org.
*
* This license is based on the BSD license adopted by the Apache Foundation.
*/
package net.jxta.impl.endpoint.relay;
import java.util.NoSuchElementException;
import java.util.logging.Level;
import net.jxta.logging.Logging;
import java.util.logging.Logger;
import net.jxta.discovery.DiscoveryService;
import net.jxta.document.Advertisement;
import net.jxta.document.AdvertisementFactory;
import net.jxta.document.XMLDocument;
import net.jxta.endpoint.EndpointAddress;
import net.jxta.endpoint.EndpointListener;
import net.jxta.endpoint.EndpointService;
import net.jxta.endpoint.Message;
import net.jxta.endpoint.MessageElement;
import net.jxta.endpoint.StringMessageElement;
import net.jxta.id.ID;
import net.jxta.peergroup.PeerGroup;
import net.jxta.protocol.ConfigParams;
import net.jxta.protocol.ModuleImplAdvertisement;
import net.jxta.platform.Module;
import net.jxta.exception.PeerGroupException;
import net.jxta.impl.util.TimeUtils;
import net.jxta.impl.protocol.RelayConfigAdv;
import net.jxta.pipe.PipeService;
/**
* The Relay Server supports the following commands:
*
* CONNECT - message contains PEERID, optional LEASE
* DISCONNECT - message contains PEERID.
* GETSERVER - message contains PEERID.
*/
public final class RelayTransport implements EndpointListener, Module {
/**
* Logger
*/
private final static Logger LOG = Logger.getLogger(RelayTransport.class.getName());
// // constants ////
static final String protocolName = "relay";
static final String RELAY_NS = "relay";
static final String REQUEST_ELEMENT = "request";
static final String RESPONSE_ELEMENT = "response";
static final String PEERID_ELEMENT = "peerid";
static final String LEASE_ELEMENT = "lease";
static final String RELAY_ADV_ELEMENT = "relayAdv";
static final String CONNECT_REQUEST = "connect";
static final MessageElement CONNECT_REQUEST_ELEMENT = new StringMessageElement(REQUEST_ELEMENT, CONNECT_REQUEST, null);
static final String DISCONNECT_REQUEST = "disconnect";
static final MessageElement DISCONNECT_REQUEST_ELEMENT = new StringMessageElement(REQUEST_ELEMENT, DISCONNECT_REQUEST, null);
static final String PID_REQUEST = "pid";
static final MessageElement PID_REQUEST_ELEMENT = new StringMessageElement(REQUEST_ELEMENT, PID_REQUEST, null);
static final String CONNECTED_RESPONSE = "connected";
static final MessageElement CONNECTED_RESPONSE_ELEMENT = new StringMessageElement(RESPONSE_ELEMENT, CONNECTED_RESPONSE, null);
static final String DISCONNECTED_RESPONSE = "disconnected";
static final MessageElement DISCONNECTED_RESPONSE_ELEMENT = new StringMessageElement(RESPONSE_ELEMENT, DISCONNECTED_RESPONSE
,
null);
static final String PID_RESPONSE = "pid";
static final MessageElement PID_RESPONSE_ELEMENT = new StringMessageElement(RESPONSE_ELEMENT, PID_RESPONSE, null);
static final int DEFAULT_MAX_CLIENTS = 150;
static final int DEFAULT_MAX_SERVERS = 1;
// Note the weird time below can be decreased but should not be increased
// otherwise there will not be enough traffic for the other side to
// keep the connection open.
static final long DEFAULT_LEASE = TimeUtils.ANHOUR;
static final long DEFAULT_STALL_TIMEOUT = 15 * TimeUtils.ASECOND;
static final long DEFAULT_POLL_INTERVAL = 15 * TimeUtils.ASECOND; // (the poll costs very little)
static final long DEFAULT_BROADCAST_INTERVAL = 10 * TimeUtils.AMINUTE;
static final int DEFAULT_CLIENT_QUEUE_SIZE = 20;
private PeerGroup group = null;
private String serviceName = null;
private RelayClient relayClient = null;
private RelayServer relayServer = null;
/**
* {@inheritDoc}
*/
public void init(PeerGroup group, ID assignedID, Advertisement implAdv) throws PeerGroupException {
this.group = group;
ModuleImplAdvertisement implAdvertisement = (ModuleImplAdvertisement) implAdv;
this.serviceName = assignedID.getUniqueValue().toString();
ConfigParams confAdv = group.getConfigAdvertisement();
// Get the config. If we do not have a config, we're done; we just keep
// the defaults (edge peer/no auto-rdv)
RelayConfigAdv relayConfigAdv = null;
if (confAdv != null) {
Advertisement adv = null;
try {
XMLDocument configDoc = (XMLDocument) confAdv.getServiceParam(assignedID);
if (null != configDoc) {
adv = AdvertisementFactory.newAdvertisement(configDoc);
}
} catch (NoSuchElementException failed) {
//ignored
} catch (IllegalArgumentException failed) {
if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
LOG.log(Level.SEVERE, "Error in relay advertisement", failed);
}
throw failed;
}
if (adv instanceof RelayConfigAdv) {
relayConfigAdv = (RelayConfigAdv) adv;
} else {
relayConfigAdv = (RelayConfigAdv) AdvertisementFactory.newAdvertisement(RelayConfigAdv.getAdvertisementType());
}
}
// XXX bondolo 20041030 I'd like to move these to startApp so that we
// can pass endpointService and share the instance.
if (relayConfigAdv.isServerEnabled()) {
relayServer = new RelayServer(group, serviceName, relayConfigAdv);
}
if (relayConfigAdv.isClientEnabled()) {
relayClient = new RelayClient(group, serviceName, relayConfigAdv);
}
if (Logging.SHOW_CONFIG && LOG.isLoggable(Level.CONFIG)) {
StringBuilder configInfo = new StringBuilder("Configuring Relay Message Transport : " + assignedID);
if (implAdvertisement != null) {
configInfo.append("\n\tImplementation :");
configInfo.append("\n\t\tModule Spec ID: ").append(implAdvertisement.getModuleSpecID());
configInfo.append("\n\t\tImpl Description : ").append(implAdvertisement.getDescription());
configInfo.append("\n\t\tImpl URI : ").append(implAdvertisement.getUri());
configInfo.append("\n\t\tImpl Code : ").append(implAdvertisement.getCode());
}
configInfo.append("\n\tGroup Params :");
configInfo.append("\n\t\tGroup : ").append(group);
configInfo.append("\n\t\tPeer ID : ").append(group.getPeerID());
configInfo.append("\n\tConfiguration :");
configInfo.append("\n\t\tService Name : ").append(serviceName);
configInfo.append("\n\t\tisServer : ").append(relayConfigAdv.isServerEnabled());
configInfo.append("\n\t\tisClient : ").append(relayConfigAdv.isClientEnabled());
LOG.config(configInfo.toString());
}
}
/**
* {@inheritDoc}
*/
public int startApp(String[] args) {
EndpointService endpoint = group.getEndpointService();
if (null == endpoint) {
if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
LOG.warning("Stalled until there is an endpoint service");
}
return START_AGAIN_STALLED;
}
// XXX bondolo 20041025 Server depends upon discovery and its non-optional.
DiscoveryService discovery = group.getDiscoveryService();
if (null == discovery) {
if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
LOG.warning("Stalled until there is a discovery service");
}
return START_AGAIN_STALLED;
}
// XXX bondolo 20041025 Server depends upon pipes and its non-optional.
PipeService pipeService = group.getPipeService();
if (null == pipeService) {
if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
LOG.warning("Stalled until there is a pipe service");
}
return START_AGAIN_STALLED;
}
endpoint.addIncomingMessageListener(this, serviceName, null);
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Message Listener added " + serviceName);
}
if (relayServer != null) {
if (!relayServer.startServer()) {
return -1; // cannot start
}
}
if (relayClient != null) {
if (!relayClient.startClient()) {
return -1; // cannot start
}
}
if (Logging.SHOW_INFO && LOG.isLoggable(Level.INFO)) {
LOG.info("Relay Message Transport started");
}
return 0;
}
/**
* {@inheritDoc}
*/
public void stopApp() {
// remove listener
EndpointService endpoint = group.getEndpointService();
if (endpoint == null) {
if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
LOG.warning("could not get EndpointService");
}
} else {
endpoint.removeIncomingMessageListener(serviceName, null);
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Message Listener removed " + serviceName);
}
}
if (relayServer != null) {
relayServer.stopServer();
}
if (relayClient != null) {
relayClient.stopClient();
}
if (Logging.SHOW_INFO && LOG.isLoggable(Level.INFO)) {
LOG.info("Relay Message Transport stopped");
}
}
/**
* {@inheritDoc}
*/
public void processIncomingMessage(Message message, EndpointAddress srcAddr, EndpointAddress dstAddr) {
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Started for " + message + "\tsrc=" + srcAddr);
}
MessageElement element;
// check if it is a request
element = message.getMessageElement(RelayTransport.RELAY_NS, REQUEST_ELEMENT);
if (element != null) {
// this is a request, pass it to the relayServer
if (relayServer != null) {
relayServer.handleRequest(message, dstAddr);
}
} else {
// check if it is a response
element = message.getMessageElement(RelayTransport.RELAY_NS, RESPONSE_ELEMENT);
if (element != null) {
// this is a response, pass it to the relayClient
if (relayClient != null) {
relayClient.handleResponse(message, dstAddr);
}
}
}
}
protected PeerGroup getGroup() {
return group;
}
protected String getServiceName() {
return serviceName;
}
// This is for reference only, the Desktop client implementation does not
// use that server feature
static Message createPIDRequestMessage() {
Message message = new Message();
message.addMessageElement(RELAY_NS, PID_REQUEST_ELEMENT);
return message;
}
static Message createPIDResponseMessage(String pidStr) {
Message message = new Message();
message.addMessageElement(RELAY_NS, PID_RESPONSE_ELEMENT);
setString(message, PEERID_ELEMENT, pidStr);
return message;
}
static Message createConnectMessage(long lease, boolean doReturnAdv, boolean doFlushQueue) {
Message message = new Message();
String request = createConnectString(lease, doReturnAdv, doFlushQueue);
setString(message, REQUEST_ELEMENT, request);
return message;
}
static String createConnectString(long lease, boolean doReturnAdv, boolean doFlushQueue) {
String request = CONNECT_REQUEST;
if (lease > 0) {
request += "," + Long.toString(lease);
} else {
request += ",";
}
if (doFlushQueue) {
request += ",flush";
} else {
request += ",keep";
}
if (doReturnAdv) {
request += ",true";
} else {
request += ",other";
}
return request;
}
static Message createConnectedMessage(long lease) {
Message message = new Message();
message.addMessageElement(RELAY_NS, CONNECTED_RESPONSE_ELEMENT);
if (lease > 0) {
setString(message, LEASE_ELEMENT, Long.toString(lease));
}
return message;
}
static Message createDisconnectMessage() {
Message message = new Message();
message.addMessageElement(RELAY_NS, DISCONNECT_REQUEST_ELEMENT);
return message;
}
static Message createDisconnectedMessage() {
Message message = new Message();
message.addMessageElement(RELAY_NS, DISCONNECTED_RESPONSE_ELEMENT);
return message;
}
/**
* Convinence function for setting a string element with the relay namespace
*
* @param message the message
* @param elementName message element name
* @param value the value of the string
*/
static void setString(Message message, String elementName, String value) {
// create a new String Element with the given value
StringMessageElement sme = new StringMessageElement(elementName, value, null);
// add the new element to the message
message.addMessageElement(RELAY_NS, sme);
}
/**
* Convinence function for getting a String from the element with the given
* tag and relay namespace
*
* @param message the message
* @param elementName the value of the string
* @return the string value, null if the element does not exist
*/
static String getString(Message message, String elementName) {
// get the requested element
MessageElement element = message.getMessageElement(RelayTransport.RELAY_NS, elementName);
// if the element is not present, return null
if (element == null) {
return null;
}
return element.toString();
}
}
