net.jxta.impl.rendezvous.StdRendezVousService Maven / Gradle / Ivy
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package net.jxta.impl.rendezvous;
import net.jxta.endpoint.EndpointAddress;
import net.jxta.endpoint.EndpointListener;
import net.jxta.endpoint.Message;
import net.jxta.endpoint.Messenger;
import net.jxta.endpoint.TextDocumentMessageElement;
import net.jxta.id.ID;
import net.jxta.id.IDFactory;
import net.jxta.impl.endpoint.EndpointUtils;
import net.jxta.impl.rendezvous.rdv.RdvPeerRdvService;
import net.jxta.impl.rendezvous.rendezvousMeter.RendezvousMeterBuildSettings;
import net.jxta.impl.rendezvous.rpv.PeerViewElement;
import net.jxta.logging.Logging;
import net.jxta.peergroup.PeerGroup;
import net.jxta.protocol.PeerAdvertisement;
import net.jxta.protocol.RouteAdvertisement;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.List;
import java.util.Timer;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Base class for providers which implement the JXTA Standard Rendezvous
* Protocol.
*
* @see JXTA Protocols Specification : Rendezvous Protocol
*/
public abstract class StdRendezVousService extends RendezVousServiceProvider {
/**
* Logger
*/
private final static Logger LOG = Logger.getLogger(StdRendezVousService.class.getName());
public final static String ConnectRequest = "Connect";
public final static String DisconnectRequest = "Disconnect";
public final static String ConnectedPeerReply = "ConnectedPeer";
public final static String ConnectedLeaseReply = "ConnectedLease";
public final static String ConnectedRdvAdvReply = "RdvAdvReply";
/**
* Default Maximum TTL.
*/
protected static final int DEFAULT_MAX_TTL = 200;
protected final String pName;
protected final String pParam;
/**
* The registered handler for messages using the Standard Rendezvous
* Protocol.
*
* @see JXTA Protocols Specification : Rendezvous Protocol
*/
private StdRdvProtocolListener handler;
protected final Timer timer;
/**
* Interface for listeners to : <assignedID>/
*/
protected interface StdRdvProtocolListener extends EndpointListener {}
/**
* Constructor
*
* @param group the PeerGroup
* @param rdvService the parent rendezvous service
*/
protected StdRendezVousService(PeerGroup group, RendezVousServiceImpl rdvService) {
super(group, rdvService);
MAX_TTL = DEFAULT_MAX_TTL;
pName = rdvService.getAssignedID().toString();
pParam = group.getPeerGroupID().getUniqueValue().toString();
timer = new Timer("StdRendezVousService Timer for " + group.getPeerGroupID(), true);
}
/**
* {@inheritDoc}
*/
protected int startApp(String[] argv, StdRdvProtocolListener handler) {
this.handler = handler;
rdvService.endpoint.addIncomingMessageListener(handler, pName, null);
return super.startApp(argv);
}
/**
* {@inheritDoc}
*/
@Override
public void stopApp() {
EndpointListener shouldbehandler = rdvService.endpoint.removeIncomingMessageListener(pName, null);
if (handler != shouldbehandler) {
if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
LOG.warning("Unregistered listener was not as expected." + handler + " != " + shouldbehandler);
}
}
timer.cancel();
super.stopApp();
}
/**
* {@inheritDoc}
*/
@Override
public void processReceivedMessage(Message message, RendezVousPropagateMessage propHdr, EndpointAddress srcAddr, EndpointAddress dstAddr) {
if (srcAddr.getProtocolName().equalsIgnoreCase("jxta")) {
String idstr = ID.URIEncodingName + ":" + ID.URNNamespace + ":" + srcAddr.getProtocolAddress();
ID peerid;
try {
peerid = IDFactory.fromURI(new URI(idstr));
} catch (URISyntaxException badID) {
if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
LOG.log(Level.WARNING, "Bad ID in message", badID);
}
return;
}
if (!group.getPeerID().equals(peerid)) {
PeerConnection pConn = getPeerConnection(peerid);
if (null == pConn) {
PeerViewElement pve;
if (this instanceof RdvPeerRdvService) {
// cheap hack....
pve = ((RdvPeerRdvService) this).rpv.getPeerViewElement(peerid);
} else {
pve = null;
}
if (null == pve) {
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Received " + message + " (" + propHdr.getMsgId() + ") from unrecognized peer : " + peerid);
}
propHdr.setTTL(Math.min(propHdr.getTTL(), 3)); // will be reduced during repropagate stage.
// FIXME 20040503 bondolo need to add tombstones so that we don't end up spamming disconnects.
if (rdvService.isRendezVous() || (getPeerConnections().length > 0)) {
// edge peers with no rdv should not send disconnect.
sendDisconnect(peerid, null);
}
} else {
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Received " + message + " (" + propHdr.getMsgId() + ") from " + pve);
}
}
} else {
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Received " + message + " (" + propHdr.getMsgId() + ") from " + pConn);
}
}
} else {
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Received " + message + " (" + propHdr.getMsgId() + ") from loopback.");
}
}
} else {
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Received " + message + " (" + propHdr.getMsgId() + ") from network -- repropagating with TTL 2");
}
propHdr.setTTL(Math.min(propHdr.getTTL(), 3)); // will be reduced during repropagate stage.
}
super.processReceivedMessage(message, propHdr, srcAddr, dstAddr);
}
/**
* {@inheritDoc}
*/
@Override
public void propagate(Enumeration destPeerIDs, Message msg, String serviceName, String serviceParam, int initialTTL) {
msg = msg.clone();
int useTTL = Math.min(initialTTL, MAX_TTL);
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine(
"Propagating " + msg + "(TTL=" + useTTL + ") to :" + "\n\tsvc name:" + serviceName + "\tsvc params:"
+ serviceParam);
}
RendezVousPropagateMessage propHdr = updatePropHeader(msg, getPropHeader(msg), serviceName, serviceParam, useTTL);
if (null != propHdr) {
int numPeers = 0;
try {
while (destPeerIDs.hasMoreElements()) {
ID dest = destPeerIDs.nextElement();
try {
PeerConnection pConn = getPeerConnection(dest);
// TODO: make use of PeerView connections as well
if (null == pConn) {
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Sending " + msg + " (" + propHdr.getMsgId() + ") to " + dest);
}
EndpointAddress addr = mkAddress(dest, PropSName, PropPName);
Messenger messenger = rdvService.endpoint.getMessengerImmediate(addr, null);
if (null != messenger) {
try {
messenger.sendMessage(msg);
} catch (IOException ignored) {
continue;
}
} else {
continue;
}
} else {
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Sending " + msg + " (" + propHdr.getMsgId() + ") to " + pConn);
}
if (pConn.isConnected()) {
pConn.sendMessage(msg.clone(), PropSName, PropPName);
} else {
continue;
}
}
numPeers++;
} catch (Exception failed) {
if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
LOG.warning("Failed to send " + msg + " (" + propHdr.getMsgId() + ") to " + dest);
}
}
}
} finally {
if (RendezvousMeterBuildSettings.RENDEZVOUS_METERING && (rendezvousMeter != null)) {
rendezvousMeter.propagateToPeers(numPeers);
}
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Propagated " + msg + " (" + propHdr.getMsgId() + ") to " + numPeers + " peers.");
}
}
} else {
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Declined to send " + msg + " ( no propHdr )");
}
}
}
/**
* {@inheritDoc}
*/
@Override
public void propagateToNeighbors(Message msg, String serviceName, String serviceParam, int initialTTL) throws IOException {
msg = msg.clone();
int useTTL = Math.min(initialTTL, MAX_TTL);
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Propagating " + msg + "(TTL=" + useTTL + ") to neighbors to :" + "\n\tsvc name:" + serviceName+ "\tsvc params:" + serviceParam);
}
RendezVousPropagateMessage propHdr = updatePropHeader(msg, getPropHeader(msg), serviceName, serviceParam, useTTL);
if (null != propHdr) {
try {
sendToNetwork(msg, propHdr);
if (RendezvousMeterBuildSettings.RENDEZVOUS_METERING && (rendezvousMeter != null)) {
rendezvousMeter.propagateToNeighbors();
}
} catch (IOException failed) {
if (RendezvousMeterBuildSettings.RENDEZVOUS_METERING && (rendezvousMeter != null)) {
rendezvousMeter.propagateToNeighborsFailed();
}
throw failed;
}
}
}
/**
* {@inheritDoc}
*/
@Override
protected void repropagate(Message msg, RendezVousPropagateMessage propHdr, String serviceName, String serviceParam) {
msg = msg.clone();
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Repropagating " + msg + " (" + propHdr.getMsgId() + ")");
}
if (RendezvousMeterBuildSettings.RENDEZVOUS_METERING && (rendezvousMeter != null)) {
rendezvousMeter.receivedMessageRepropagatedInGroup();
}
try {
propHdr = updatePropHeader(msg, propHdr, serviceName, serviceParam, MAX_TTL);
if (null != propHdr) {
// Note (hamada): This is an unnecessary operation, and serves
// no purpose other than the additional loads it imposes on the
// rendezvous. Local subnet network operations should be (and are)
// sufficient to achieve the goal.
// sendToEachConnection(msg, propHdr);
sendToNetwork(msg, propHdr);
} else {
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("No propagate header, declining to repropagate " + msg + ")");
}
}
} catch (Exception ez1) {
// Not much we can do
if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
if (propHdr != null) {
LOG.log(Level.WARNING, "Failed to repropagate " + msg + " (" + propHdr.getMsgId() + ")", ez1);
} else {
LOG.log(Level.WARNING, "Could to repropagate " + msg, ez1);
}
}
}
}
/**
* Returns the peer connection or null if not present.
*
* @param id the node ID
* @return PeerConnection the peer connection or null if not present.
*/
public abstract PeerConnection getPeerConnection(ID id);
/**
* Returns an array of the current peer connections.
*
* @return An array of the current peer connections.
*/
protected abstract PeerConnection[] getPeerConnections();
/**
* Sends to all connected peers.
*
* Note: The original msg is not modified and may be reused upon return.
*
* @param msg The message to be sent.
* @param propHdr The propagation header associated with the message.
* @return the number of nodes the message was sent to
*/
protected int sendToEachConnection(Message msg, RendezVousPropagateMessage propHdr) {
List peers = Arrays.asList(getPeerConnections());
int sentToPeers = 0;
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Sending " + msg + "(" + propHdr.getMsgId() + ") to " + peers.size() + " peers.");
}
for (PeerConnection pConn : peers) {
// Check if this rendezvous has already processed this propagated message.
if (!pConn.isConnected()) {
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Skipping " + pConn + " for " + msg + "(" + propHdr.getMsgId() + ") -- disconnected.");
}
// next!
continue;
}
if (propHdr.isVisited(pConn.getPeerID().toURI())) {
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Skipping " + pConn + " for " + msg + "(" + propHdr.getMsgId() + ") -- already visited.");
}
// next!
continue;
}
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Sending " + msg + "(" + propHdr.getMsgId() + ") to " + pConn);
}
if (pConn.sendMessage(msg.clone(), PropSName, PropPName)) {
sentToPeers++;
}
}
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Sent " + msg + "(" + propHdr.getMsgId() + ") to " + sentToPeers + " of " + peers.size() + " peers.");
}
return sentToPeers;
}
/**
* Sends a disconnect message to the specified peer.
*
* @param peerid The peer to be disconnected.
* @param padv The peer to be disconnected.
*/
protected void sendDisconnect(ID peerid, PeerAdvertisement padv) {
Message msg = new Message();
// The request simply includes the local peer advertisement.
try {
msg.replaceMessageElement("jxta", new TextDocumentMessageElement(DisconnectRequest, getPeerAdvertisementDoc(), null));
EndpointAddress addr = mkAddress(peerid, null, null);
RouteAdvertisement hint = null;
if (null != padv) {
hint = EndpointUtils.extractRouteAdv(padv);
}
Messenger messenger = rdvService.endpoint.getMessengerImmediate(addr, hint);
if (null == messenger) {
if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
LOG.warning("Could not get messenger for " + peerid);
}
return;
}
messenger.sendMessage(msg, pName, pParam);
} catch (Exception e) {
if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
LOG.log(Level.WARNING, "sendDisconnect failed", e);
}
}
}
/**
* Sends a disconnect message to the specified peer.
*
* @param pConn The peer to be disconnected.
*/
protected void sendDisconnect(PeerConnection pConn) {
Message msg = new Message();
// The request simply includes the local peer advertisement.
try {
msg.replaceMessageElement("jxta", new TextDocumentMessageElement(DisconnectRequest, getPeerAdvertisementDoc(), null));
pConn.sendMessage(msg, pName, pParam);
} catch (Exception e) {
if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
LOG.log(Level.WARNING, "sendDisconnect failed", e);
}
}
}
}