pcep/impl/src/main/java/org/opendaylight/protocol/pcep/impl/PCEPSessionNegotiator.java

   1 /*
   2  * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.protocol.pcep.impl;
   9
  10 import com.google.common.base.Optional;
  11 import com.google.common.primitives.UnsignedBytes;
  12 import io.netty.channel.Channel;
  13 import io.netty.channel.ChannelFuture;
  14 import io.netty.channel.ChannelFutureListener;
  15 import io.netty.util.concurrent.Promise;
  16 import java.net.InetSocketAddress;
  17 import java.util.Comparator;
  18 import java.util.concurrent.ExecutionException;
  19 import org.opendaylight.protocol.framework.AbstractSessionNegotiator;
  20 import org.opendaylight.protocol.framework.SessionListenerFactory;
  21 import org.opendaylight.protocol.pcep.PCEPSessionListener;
  22 import org.opendaylight.protocol.pcep.impl.PCEPPeerRegistry.SessionReference;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.Message;
  24 import org.slf4j.Logger;
  25 import org.slf4j.LoggerFactory;
  26
  27 public class PCEPSessionNegotiator extends AbstractSessionNegotiator<Message, PCEPSessionImpl> {
  28
  29     private static final Logger LOG = LoggerFactory.getLogger(PCEPSessionNegotiator.class);
  30
  31     private static final Comparator<byte[]> COMPARATOR = UnsignedBytes.lexicographicalComparator();
  32
  33     private final Channel channel;
  34
  35     private final Promise<PCEPSessionImpl> promise;
  36
  37     private final SessionListenerFactory<PCEPSessionListener> factory;
  38
  39     private final AbstractPCEPSessionNegotiatorFactory negFactory;
  40
  41     public PCEPSessionNegotiator(final Channel channel, final Promise<PCEPSessionImpl> promise, final SessionListenerFactory<PCEPSessionListener> factory,
  42         final AbstractPCEPSessionNegotiatorFactory negFactory) {
  43         super(promise, channel);
  44         this.channel = channel;
  45         this.promise = promise;
  46         this.factory = factory;
  47         this.negFactory = negFactory;
  48     }
  49
  50     @Override
  51     protected void startNegotiation() throws ExecutionException {
  52         final Object lock = this;
  53
  54         LOG.debug("Bootstrap negotiation for channel {} started", this.channel);
  55
  56         /*
  57          * We have a chance to see if there's a client session already
  58          * registered for this client.
  59          */
  60         final byte[] clientAddress = ((InetSocketAddress) this.channel.remoteAddress()).getAddress().getAddress();
  61         final PCEPPeerRegistry sessionReg = this.negFactory.getSessionRegistry();
  62
  63         synchronized (lock) {
  64             if (sessionReg.getSessionReference(clientAddress).isPresent()) {
  65                 final byte[] serverAddress = ((InetSocketAddress) this.channel.localAddress()).getAddress().getAddress();
  66                 if (COMPARATOR.compare(serverAddress, clientAddress) > 0) {
  67                     final Optional<SessionReference> sessionRefMaybe = sessionReg.removeSessionReference(clientAddress);
  68                     try {
  69                         if (sessionRefMaybe.isPresent()) {
  70                             sessionRefMaybe.get().close();
  71                         }
  72                     } catch (final Exception e) {
  73                         LOG.error("Unexpected failure to close old session", e);
  74                     }
  75                 } else {
  76                     negotiationFailed(new IllegalStateException("A conflicting session for address "
  77                             + ((InetSocketAddress) this.channel.remoteAddress()).getAddress() + " found."));
  78                     return;
  79                 }
  80             }
  81
  82             final Short sessionId = sessionReg.nextSession(clientAddress);
  83             final AbstractPCEPSessionNegotiator n = this.negFactory.createNegotiator(this.promise, this.factory.getSessionListener(), this.channel, sessionId);
  84
  85             sessionReg.putSessionReference(clientAddress, new SessionReference() {
  86                 @Override
  87                 public void close() throws ExecutionException {
  88                     try {
  89                         sessionReg.releaseSession(clientAddress, sessionId);
  90                     } finally {
  91                         PCEPSessionNegotiator.this.channel.close();
  92                     }
  93                 }
  94
  95                 @Override
  96                 public Short getSessionId() {
  97                     return sessionId;
  98                 }
  99             });
 100
 101             this.channel.closeFuture().addListener(new ChannelFutureListener() {
 102                 @Override
 103                 public void operationComplete(final ChannelFuture future) {
 104                     synchronized (lock) {
 105                         sessionReg.removeSessionReference(clientAddress);
 106                     }
 107                 }
 108             });
 109
 110             LOG.info("Replacing bootstrap negotiator for channel {}", this.channel);
 111             this.channel.pipeline().replace(this, "negotiator", n);
 112             n.startNegotiation();
 113         }
 114     }
 115
 116     @Override
 117     protected void handleMessage(final Message msg) {
 118         throw new IllegalStateException("Bootstrap negotiator should have been replaced");
 119     }
 120 }