Shuyi Chen | d7955ce | 2013-05-22 14:51:55 -0700 | [diff] [blame] | 1 | /** |
| 2 | * $RCSfile$ |
| 3 | * $Revision$ |
| 4 | * $Date$ |
| 5 | * |
| 6 | * Copyright 2003-2006 Jive Software. |
| 7 | * |
| 8 | * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); |
| 9 | * you may not use this file except in compliance with the License. |
| 10 | * You may obtain a copy of the License at |
| 11 | * |
| 12 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 13 | * |
| 14 | * Unless required by applicable law or agreed to in writing, software |
| 15 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 16 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 17 | * See the License for the specific language governing permissions and |
| 18 | * limitations under the License. |
| 19 | */ |
| 20 | package org.jivesoftware.smackx.filetransfer; |
| 21 | |
| 22 | import org.jivesoftware.smack.PacketCollector; |
| 23 | import org.jivesoftware.smack.SmackConfiguration; |
| 24 | import org.jivesoftware.smack.Connection; |
| 25 | import org.jivesoftware.smack.XMPPException; |
| 26 | import org.jivesoftware.smack.filter.OrFilter; |
| 27 | import org.jivesoftware.smack.filter.PacketFilter; |
| 28 | import org.jivesoftware.smack.packet.Packet; |
| 29 | import org.jivesoftware.smackx.packet.StreamInitiation; |
| 30 | |
| 31 | import java.io.InputStream; |
| 32 | import java.io.OutputStream; |
| 33 | import java.util.concurrent.*; |
| 34 | import java.util.List; |
| 35 | import java.util.ArrayList; |
| 36 | |
| 37 | |
| 38 | /** |
| 39 | * The fault tolerant negotiator takes two stream negotiators, the primary and the secondary |
| 40 | * negotiator. If the primary negotiator fails during the stream negotiaton process, the second |
| 41 | * negotiator is used. |
| 42 | */ |
| 43 | public class FaultTolerantNegotiator extends StreamNegotiator { |
| 44 | |
| 45 | private StreamNegotiator primaryNegotiator; |
| 46 | private StreamNegotiator secondaryNegotiator; |
| 47 | private Connection connection; |
| 48 | private PacketFilter primaryFilter; |
| 49 | private PacketFilter secondaryFilter; |
| 50 | |
| 51 | public FaultTolerantNegotiator(Connection connection, StreamNegotiator primary, |
| 52 | StreamNegotiator secondary) { |
| 53 | this.primaryNegotiator = primary; |
| 54 | this.secondaryNegotiator = secondary; |
| 55 | this.connection = connection; |
| 56 | } |
| 57 | |
| 58 | public PacketFilter getInitiationPacketFilter(String from, String streamID) { |
| 59 | if (primaryFilter == null || secondaryFilter == null) { |
| 60 | primaryFilter = primaryNegotiator.getInitiationPacketFilter(from, streamID); |
| 61 | secondaryFilter = secondaryNegotiator.getInitiationPacketFilter(from, streamID); |
| 62 | } |
| 63 | return new OrFilter(primaryFilter, secondaryFilter); |
| 64 | } |
| 65 | |
| 66 | InputStream negotiateIncomingStream(Packet streamInitiation) throws XMPPException { |
| 67 | throw new UnsupportedOperationException("Negotiation only handled by create incoming " + |
| 68 | "stream method."); |
| 69 | } |
| 70 | |
| 71 | final Packet initiateIncomingStream(Connection connection, StreamInitiation initiation) { |
| 72 | throw new UnsupportedOperationException("Initiation handled by createIncomingStream " + |
| 73 | "method"); |
| 74 | } |
| 75 | |
| 76 | public InputStream createIncomingStream(StreamInitiation initiation) throws XMPPException { |
| 77 | PacketCollector collector = connection.createPacketCollector( |
| 78 | getInitiationPacketFilter(initiation.getFrom(), initiation.getSessionID())); |
| 79 | |
| 80 | connection.sendPacket(super.createInitiationAccept(initiation, getNamespaces())); |
| 81 | |
| 82 | ExecutorService threadPoolExecutor = Executors.newFixedThreadPool(2); |
| 83 | CompletionService<InputStream> service |
| 84 | = new ExecutorCompletionService<InputStream>(threadPoolExecutor); |
| 85 | List<Future<InputStream>> futures = new ArrayList<Future<InputStream>>(); |
| 86 | InputStream stream = null; |
| 87 | XMPPException exception = null; |
| 88 | try { |
| 89 | futures.add(service.submit(new NegotiatorService(collector))); |
| 90 | futures.add(service.submit(new NegotiatorService(collector))); |
| 91 | |
| 92 | int i = 0; |
| 93 | while (stream == null && i < futures.size()) { |
| 94 | Future<InputStream> future; |
| 95 | try { |
| 96 | i++; |
| 97 | future = service.poll(10, TimeUnit.SECONDS); |
| 98 | } |
| 99 | catch (InterruptedException e) { |
| 100 | continue; |
| 101 | } |
| 102 | |
| 103 | if (future == null) { |
| 104 | continue; |
| 105 | } |
| 106 | |
| 107 | try { |
| 108 | stream = future.get(); |
| 109 | } |
| 110 | catch (InterruptedException e) { |
| 111 | /* Do Nothing */ |
| 112 | } |
| 113 | catch (ExecutionException e) { |
| 114 | exception = new XMPPException(e.getCause()); |
| 115 | } |
| 116 | } |
| 117 | } |
| 118 | finally { |
| 119 | for (Future<InputStream> future : futures) { |
| 120 | future.cancel(true); |
| 121 | } |
| 122 | collector.cancel(); |
| 123 | threadPoolExecutor.shutdownNow(); |
| 124 | } |
| 125 | if (stream == null) { |
| 126 | if (exception != null) { |
| 127 | throw exception; |
| 128 | } |
| 129 | else { |
| 130 | throw new XMPPException("File transfer negotiation failed."); |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | return stream; |
| 135 | } |
| 136 | |
| 137 | private StreamNegotiator determineNegotiator(Packet streamInitiation) { |
| 138 | return primaryFilter.accept(streamInitiation) ? primaryNegotiator : secondaryNegotiator; |
| 139 | } |
| 140 | |
| 141 | public OutputStream createOutgoingStream(String streamID, String initiator, String target) |
| 142 | throws XMPPException { |
| 143 | OutputStream stream; |
| 144 | try { |
| 145 | stream = primaryNegotiator.createOutgoingStream(streamID, initiator, target); |
| 146 | } |
| 147 | catch (XMPPException ex) { |
| 148 | stream = secondaryNegotiator.createOutgoingStream(streamID, initiator, target); |
| 149 | } |
| 150 | |
| 151 | return stream; |
| 152 | } |
| 153 | |
| 154 | public String[] getNamespaces() { |
| 155 | String[] primary = primaryNegotiator.getNamespaces(); |
| 156 | String[] secondary = secondaryNegotiator.getNamespaces(); |
| 157 | |
| 158 | String[] namespaces = new String[primary.length + secondary.length]; |
| 159 | System.arraycopy(primary, 0, namespaces, 0, primary.length); |
| 160 | System.arraycopy(secondary, 0, namespaces, primary.length, secondary.length); |
| 161 | |
| 162 | return namespaces; |
| 163 | } |
| 164 | |
| 165 | public void cleanup() { |
| 166 | } |
| 167 | |
| 168 | private class NegotiatorService implements Callable<InputStream> { |
| 169 | |
| 170 | private PacketCollector collector; |
| 171 | |
| 172 | NegotiatorService(PacketCollector collector) { |
| 173 | this.collector = collector; |
| 174 | } |
| 175 | |
| 176 | public InputStream call() throws Exception { |
| 177 | Packet streamInitiation = collector.nextResult( |
| 178 | SmackConfiguration.getPacketReplyTimeout() * 2); |
| 179 | if (streamInitiation == null) { |
| 180 | throw new XMPPException("No response from remote client"); |
| 181 | } |
| 182 | StreamNegotiator negotiator = determineNegotiator(streamInitiation); |
| 183 | return negotiator.negotiateIncomingStream(streamInitiation); |
| 184 | } |
| 185 | } |
| 186 | } |