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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;
import net.jxta.document.Advertisement;
import net.jxta.endpoint.ChannelMessenger;
import net.jxta.endpoint.EndpointAddress;
import net.jxta.endpoint.EndpointListener;
import net.jxta.endpoint.EndpointService;
import net.jxta.endpoint.ListenerAdaptor;
import net.jxta.endpoint.Message;
import net.jxta.endpoint.MessageFilterListener;
import net.jxta.endpoint.MessageTransport;
import net.jxta.endpoint.Messenger;
import net.jxta.endpoint.MessengerEventListener;
import net.jxta.id.ID;
import net.jxta.impl.util.TimeUtils;
import net.jxta.impl.peergroup.StdPeerGroup;
import net.jxta.peergroup.PeerGroup;
import net.jxta.protocol.ModuleImplAdvertisement;
import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.util.Iterator;
import java.util.Map;
import java.util.WeakHashMap;
import net.jxta.platform.Module;
/**
* Provides an interface object appropriate for applications using the endpoint
* service. The interface provides a number of convenience features and
* implementation necessary for legacy features.
*/
class EndpointServiceInterface implements EndpointService {
/**
* The service interface that we will be fronting.
*/
private final EndpointServiceImpl theRealThing;
/**
* The number of active instances of this class. We use this for deciding
* when to instantiate and shutdown the listener adaptor.
*/
private static int activeInstanceCount = 0;
/**
* Provides emulation of the legacy send-message-with-listener and get-messenger-with-listener APIs.
*/
private static ListenerAdaptor listenerAdaptor;
/**
* The cache of channels. If a given owner of this EndpointService interface
* object requests channels for the same exact destination multiple times,
* we will return the same channel object as much as possible. We keep
* channels in a weak map, so that when channels are discarded, they
* eventually disappear. Channels that have messages in them are always
* referenced. Therefore, this prevents the creation of more than one
* channel with messages in it for the same destination in the same context
* (owner of interface object - typically one module). This is required to
* properly support the common (and convenient) pattern:
*
* m = endpointServiceInterface.getMessenger(); messenger.sendMessage(); m = null;
*
* If that was not kept in check, it would be possible to inadvertently
* create an infinite number of channels with pending messages, thus an
* infinite number of messages too.
*/
private final Map> channelCache = new WeakHashMap>();
/**
* Builds a new interface object.
*
* @param endpointService the endpoint service that we will front.
*/
public EndpointServiceInterface(EndpointServiceImpl endpointService) {
theRealThing = endpointService;
synchronized (this.getClass()) {
activeInstanceCount++;
if (1 == activeInstanceCount) {
listenerAdaptor = new ListenerAdaptor(Thread.currentThread().getThreadGroup(), ((StdPeerGroup) endpointService.getGroup()).getExecutor());
}
}
}
/**
* {@inheritDoc}
*
* This is rather heavy-weight if instances are frequently created and
* discarded since finalization significantly delays GC.
*/
@Override
protected void finalize() throws Throwable {
synchronized (this.getClass()) {
activeInstanceCount--;
if (0 == activeInstanceCount) {
listenerAdaptor.shutdown();
listenerAdaptor = null;
}
}
super.finalize();
}
/**
* {@inheritDoc}
*
* it is there only to satisfy the requirements of the interface that we
* implement. Ultimately, the API should define two levels of interfaces :
* one for the real service implementation and one for the interface object.
* Right now it feels a bit heavy to so that since the only different
* between the two would be init() and may-be getName().
*/
public void init(PeerGroup peerGroup, ID id, Advertisement implAdv) {
}
/**
* {@inheritDoc}
*
* This is here for temporary class hierarchy reasons.
* it is ALWAYS ignored. By definition, the interface object
* protects the real object's start/stop methods from being called
*/
public int startApp(String[] arg) {
return Module.START_OK;
}
/**
* {@inheritDoc}
*
* This is here for temporary class hierarchy reasons.
* it is ALWAYS ignored. By definition, the interface object
* protects the real object's start/stop methods from being called
*
* This request is currently ignored.
*/
public void stopApp() {
}
/**
* {@inheritDoc}
*/
public ModuleImplAdvertisement getImplAdvertisement() {
return theRealThing.getImplAdvertisement();
}
/**
* {@inheritDoc}
*
* Sort of absurd but this is part of the API we're implementing.
* We would not do a two-level API just for that.
*/
public EndpointService getInterface() {
return this;
}
/**
* {@inheritDoc}
*/
public PeerGroup getGroup() {
return theRealThing.getGroup();
}
/**
* {@inheritDoc}
*/
public Messenger getCanonicalMessenger(EndpointAddress addr, Object hint) {
// XXX: maybe we should enforce the stripping of the address here.
// That would prevent application from making canonical messengers with a variety of service names and
// service params. On the other hand that would cost useless cloning of endp addrs and prevent future
// flexibility regarding QOS params, possibly. Be liberal for now.
return theRealThing.getCanonicalMessenger(addr, hint);
}
/**
* {@inheritDoc}
*/
public Messenger getMessengerImmediate(EndpointAddress addr, Object hint) {
// Note: for now, the hint is not used for canonicalization (hint != QOS).
synchronized (channelCache) {
Reference existing = channelCache.get(addr);
if (existing != null) {
Messenger messenger = existing.get();
if ((messenger != null) && ((messenger.getState() & Messenger.USABLE) != 0)) {
return messenger;
}
}
}
// We do not have a good one at hand. Make a new one.
// Use the stripped address to get a canonical msngr; not doing so
// would reduce the sharing to almost nothing.
EndpointAddress plainAddr = new EndpointAddress(addr, null, null);
Messenger found = theRealThing.getCanonicalMessenger(plainAddr, hint);
// Address must not be a supported one.
if (found == null) {
return null;
}
// Get a channel for that servicename and serviceparam. redirect to this group.
// NOTE: This assumes that theRealThing.getGroup() is really the group where the application that obtained
// this interface object lives. This is the case today because all groups have their own endpoint service.
// In the future, interface objects may refer to a group context that is not necessarily the group where
// "therealThing" lives. When that happens, this interface object will have to know which group it works
// for without asking "theRealThing".
ChannelMessenger res = (ChannelMessenger) found.getChannelMessenger(theRealThing.getGroup().getPeerGroupID(),
addr.getServiceName(), addr.getServiceParameter());
synchronized (channelCache) {
// We have to check again. May be we did all that in parallel with some other thread and it beat
// us to the finish line. In which case, substitute the existing one and throw ours away.
Reference existing = channelCache.get(addr);
if (existing != null) {
Messenger messenger = existing.get();
if ((messenger != null) && ((messenger.getState() & Messenger.USABLE) != 0)) {
return messenger;
}
}
// The listenerAdaptor of this interface obj is used to support the sendMessage-with-listener API.
res.setMessageWatcher(listenerAdaptor);
channelCache.put(res.getDestinationAddress(), new WeakReference(res));
}
return res;
}
/**
* {@inheritDoc}
*/
public Messenger getMessenger(EndpointAddress addr) {
return getMessenger(addr, null);
}
/**
* {@inheritDoc}
*/
public Messenger getMessenger(EndpointAddress addr, Object hint) {
// Get an unresolved messenger (that's immediate).
Messenger messenger = getMessengerImmediate(addr, hint);
if (messenger == null) {
return null;
}
// Now ask the messenger to resolve: this legacy blocking API ensures
// that only successfully resolved messengers are ever returned.
messenger.resolve();
try {
messenger.waitState(Messenger.RESOLVED | Messenger.TERMINAL, TimeUtils.AMINUTE);
} catch (InterruptedException ie) {
Thread.interrupted();
}
// check the state
int state = messenger.getState();
if ((state & Messenger.TERMINAL) != 0) {
return null;
}
if ((state & Messenger.RESOLVED) == 0) {
// Not failed yet. But too late for us.
return null;
}
return messenger;
}
/**
* {@inheritDoc}
*/
public void propagate(Message msg, String serviceName, String serviceParam) {
theRealThing.propagate(msg, serviceName, serviceParam, Integer.MAX_VALUE);
}
/**
* {@inheritDoc}
*/
public void propagate(Message msg, String serviceName, String serviceParam, int initialTTL) {
theRealThing.propagate(msg, serviceName, serviceParam, initialTTL);
}
/**
* {@inheritDoc}
*/
public void demux(Message msg) {
theRealThing.demux(msg);
}
/**
* {@inheritDoc}
*/
public void processIncomingMessage(Message message, EndpointAddress source, EndpointAddress destination) {
theRealThing.processIncomingMessage(message, source, destination);
}
/**
* {@inheritDoc}
*/
@Deprecated
public boolean ping(EndpointAddress addr) {
return null != getMessengerImmediate(addr, null);
}
/**
* {@inheritDoc}
*/
public MessengerEventListener addMessageTransport(MessageTransport transpt) {
// FIXME TOO: We should probably make the interface refuse to do it.
// But that will have to wait until we have criteria to decide who
// gets an interface object and who gets the real thing. In the
// meantime just do it.
return theRealThing.addMessageTransport(transpt);
}
/**
* {@inheritDoc}
*/
public boolean removeMessageTransport(MessageTransport transpt) {
// FIXME TOO: We should probably make the interface refuse to do it.
// But that will have to wait until we have criteria to decide who
// gets an interface object and who gets the real thing. In the
// meantime just do it.
return theRealThing.removeMessageTransport(transpt);
}
/**
* {@inheritDoc}
*/
public Iterator getAllMessageTransports() {
return theRealThing.getAllMessageTransports();
}
/**
* {@inheritDoc}
*/
public MessageTransport getMessageTransport(String name) {
return theRealThing.getMessageTransport(name);
}
/**
* {@inheritDoc}
*/
public boolean addIncomingMessageListener(EndpointListener listener, String serviceName, String serviceParam) {
return theRealThing.addIncomingMessageListener(listener, serviceName, serviceParam);
}
/**
* {@inheritDoc}
*/
public EndpointListener getIncomingMessageListener(String serviceName, String serviceParam) {
return theRealThing.getIncomingMessageListener(serviceName, serviceParam);
}
/**
* {@inheritDoc}
*/
public void addIncomingMessageFilterListener(MessageFilterListener listener, String namespace, String name) {
theRealThing.addIncomingMessageFilterListener(listener, namespace, name);
}
/**
* {@inheritDoc}
*/
public void addOutgoingMessageFilterListener(MessageFilterListener listener, String namespace, String name) {
theRealThing.addOutgoingMessageFilterListener(listener, namespace, name);
}
/**
* {@inheritDoc}
*/
public MessageFilterListener removeIncomingMessageFilterListener(MessageFilterListener listener, String namespace, String name) {
return theRealThing.removeIncomingMessageFilterListener(listener, namespace, name);
}
/**
* {@inheritDoc}
*/
public MessageFilterListener removeOutgoingMessageFilterListener(MessageFilterListener listener, String namespace, String name) {
return theRealThing.removeOutgoingMessageFilterListener(listener, namespace, name);
}
/**
* {@inheritDoc}
*/
public EndpointListener removeIncomingMessageListener(String serviceName, String serviceParam) {
return theRealThing.removeIncomingMessageListener(serviceName, serviceParam);
}
/**
* {@inheritDoc}
*/
public boolean addMessengerEventListener(MessengerEventListener listener, int prio) {
return theRealThing.addMessengerEventListener(listener, prio);
}
/**
* {@inheritDoc}
*/
public boolean removeMessengerEventListener(MessengerEventListener listener, int prio) {
return theRealThing.removeMessengerEventListener(listener, prio);
}
/**
* {@inheritDoc}
*
* @deprecated legacy support
*/
@Deprecated
public boolean getMessenger(MessengerEventListener listener, EndpointAddress addr, Object hint) {
Messenger messenger = getMessengerImmediate(addr, hint);
if (messenger == null) {
return false;
}
if (!listenerAdaptor.watchMessenger(listener, messenger)) {
return false;
}
// Make sure that resolution is being attempted if not already in progress.
messenger.resolve();
return true;
}
/**
* Returns a Direct Messenger that may be used to send messages via this endpoint to the specified destination.
*
* @param addr the destination address.
* @param hint the messenger hint, if any, otherwise null.
* @param exclusive if true avoids caching the messenger
* @return The messenger or {@code null} is returned if the destination address is not reachable.
*/
public Messenger getDirectMessenger(EndpointAddress addr, Object hint, boolean exclusive) {
return theRealThing.getDirectMessenger(addr, hint, exclusive);
}
}
