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/**
* $RCSfile$
* $Revision$
* $Date$
*
* Copyright 2003-2006 Jive Software.
*
* All rights reserved. Licensed 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.jivesoftware.smackx.filetransfer;
import org.jivesoftware.smack.PacketCollector;
import org.jivesoftware.smack.SmackConfiguration;
import org.jivesoftware.smack.Connection;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.filter.OrFilter;
import org.jivesoftware.smack.filter.PacketFilter;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smackx.packet.StreamInitiation;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.concurrent.*;
import java.util.List;
import java.util.ArrayList;
/**
* The fault tolerant negotiator takes two stream negotiators, the primary and the secondary
* negotiator. If the primary negotiator fails during the stream negotiaton process, the second
* negotiator is used.
*/
public class FaultTolerantNegotiator extends StreamNegotiator {
private StreamNegotiator primaryNegotiator;
private StreamNegotiator secondaryNegotiator;
private Connection connection;
private PacketFilter primaryFilter;
private PacketFilter secondaryFilter;
public FaultTolerantNegotiator(Connection connection, StreamNegotiator primary,
StreamNegotiator secondary) {
this.primaryNegotiator = primary;
this.secondaryNegotiator = secondary;
this.connection = connection;
}
public PacketFilter getInitiationPacketFilter(String from, String streamID) {
if (primaryFilter == null || secondaryFilter == null) {
primaryFilter = primaryNegotiator.getInitiationPacketFilter(from, streamID);
secondaryFilter = secondaryNegotiator.getInitiationPacketFilter(from, streamID);
}
return new OrFilter(primaryFilter, secondaryFilter);
}
InputStream negotiateIncomingStream(Packet streamInitiation) throws XMPPException {
throw new UnsupportedOperationException("Negotiation only handled by create incoming " +
"stream method.");
}
final Packet initiateIncomingStream(Connection connection, StreamInitiation initiation) {
throw new UnsupportedOperationException("Initiation handled by createIncomingStream " +
"method");
}
public InputStream createIncomingStream(StreamInitiation initiation) throws XMPPException {
PacketCollector collector = connection.createPacketCollector(
getInitiationPacketFilter(initiation.getFrom(), initiation.getSessionID()));
connection.sendPacket(super.createInitiationAccept(initiation, getNamespaces()));
ExecutorService threadPoolExecutor = Executors.newFixedThreadPool(2);
CompletionService<InputStream> service
= new ExecutorCompletionService<InputStream>(threadPoolExecutor);
List<Future<InputStream>> futures = new ArrayList<Future<InputStream>>();
InputStream stream = null;
XMPPException exception = null;
try {
futures.add(service.submit(new NegotiatorService(collector)));
futures.add(service.submit(new NegotiatorService(collector)));
int i = 0;
while (stream == null && i < futures.size()) {
Future<InputStream> future;
try {
i++;
future = service.poll(10, TimeUnit.SECONDS);
}
catch (InterruptedException e) {
continue;
}
if (future == null) {
continue;
}
try {
stream = future.get();
}
catch (InterruptedException e) {
/* Do Nothing */
}
catch (ExecutionException e) {
exception = new XMPPException(e.getCause());
}
}
}
finally {
for (Future<InputStream> future : futures) {
future.cancel(true);
}
collector.cancel();
threadPoolExecutor.shutdownNow();
}
if (stream == null) {
if (exception != null) {
throw exception;
}
else {
throw new XMPPException("File transfer negotiation failed.");
}
}
return stream;
}
private StreamNegotiator determineNegotiator(Packet streamInitiation) {
return primaryFilter.accept(streamInitiation) ? primaryNegotiator : secondaryNegotiator;
}
public OutputStream createOutgoingStream(String streamID, String initiator, String target)
throws XMPPException {
OutputStream stream;
try {
stream = primaryNegotiator.createOutgoingStream(streamID, initiator, target);
}
catch (XMPPException ex) {
stream = secondaryNegotiator.createOutgoingStream(streamID, initiator, target);
}
return stream;
}
public String[] getNamespaces() {
String[] primary = primaryNegotiator.getNamespaces();
String[] secondary = secondaryNegotiator.getNamespaces();
String[] namespaces = new String[primary.length + secondary.length];
System.arraycopy(primary, 0, namespaces, 0, primary.length);
System.arraycopy(secondary, 0, namespaces, primary.length, secondary.length);
return namespaces;
}
public void cleanup() {
}
private class NegotiatorService implements Callable<InputStream> {
private PacketCollector collector;
NegotiatorService(PacketCollector collector) {
this.collector = collector;
}
public InputStream call() throws Exception {
Packet streamInitiation = collector.nextResult(
SmackConfiguration.getPacketReplyTimeout() * 2);
if (streamInitiation == null) {
throw new XMPPException("No response from remote client");
}
StreamNegotiator negotiator = determineNegotiator(streamInitiation);
return negotiator.negotiateIncomingStream(streamInitiation);
}
}
}
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