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.pcep.PCEPSessionListenerFactory;
  20 import org.opendaylight.protocol.pcep.impl.PCEPPeerRegistry.SessionReference;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.Message;
  22 import org.slf4j.Logger;
  23 import org.slf4j.LoggerFactory;
  24
  25 public class PCEPSessionNegotiator extends AbstractSessionNegotiator {
  26
  27     private static final Logger LOG = LoggerFactory.getLogger(PCEPSessionNegotiator.class);
  28
  29     private static final Comparator<byte[]> COMPARATOR = UnsignedBytes.lexicographicalComparator();
  30
  31     private final PCEPSessionListenerFactory factory;
  32
  33     private final AbstractPCEPSessionNegotiatorFactory negFactory;
  34
  35     public PCEPSessionNegotiator(final Channel channel, final Promise<PCEPSessionImpl> promise, final PCEPSessionListenerFactory factory,
  36         final AbstractPCEPSessionNegotiatorFactory negFactory) {
  37         super(promise, channel);
  38         this.factory = factory;
  39         this.negFactory = negFactory;
  40     }
  41
  42     protected void startNegotiation() throws ExecutionException {
  43         final Object lock = this;
  44
  45         LOG.debug("Bootstrap negotiation for channel {} started", this.channel);
  46
  47         /*
  48          * We have a chance to see if there's a client session already
  49          * registered for this client.
  50          */
  51         final byte[] clientAddress = ((InetSocketAddress) this.channel.remoteAddress()).getAddress().getAddress();
  52         final PCEPPeerRegistry sessionReg = this.negFactory.getSessionRegistry();
  53
  54         synchronized (lock) {
  55             if (sessionReg.getSessionReference(clientAddress).isPresent()) {
  56                 final byte[] serverAddress = ((InetSocketAddress) this.channel.localAddress()).getAddress().getAddress();
  57                 if (COMPARATOR.compare(serverAddress, clientAddress) > 0) {
  58                     final Optional<SessionReference> sessionRefMaybe = sessionReg.removeSessionReference(clientAddress);
  59                     try {
  60                         if (sessionRefMaybe.isPresent()) {
  61                             sessionRefMaybe.get().close();
  62                         }
  63                     } catch (final Exception e) {
  64                         LOG.error("Unexpected failure to close old session", e);
  65                     }
  66                 } else {
  67                     negotiationFailed(new IllegalStateException("A conflicting session for address "
  68                             + ((InetSocketAddress) this.channel.remoteAddress()).getAddress() + " found."));
  69                     return;
  70                 }
  71             }
  72
  73             final Short sessionId = sessionReg.nextSession(clientAddress);
  74             final AbstractPCEPSessionNegotiator n = this.negFactory.createNegotiator(this.promise, this.factory.getSessionListener(), this.channel, sessionId);
  75
  76             sessionReg.putSessionReference(clientAddress, new SessionReference() {
  77                 @Override
  78                 public void close() throws ExecutionException {
  79                     try {
  80                         sessionReg.releaseSession(clientAddress, sessionId);
  81                     } finally {
  82                         PCEPSessionNegotiator.this.channel.close();
  83                     }
  84                 }
  85
  86                 @Override
  87                 public Short getSessionId() {
  88                     return sessionId;
  89                 }
  90             });
  91
  92             this.channel.closeFuture().addListener(new ChannelFutureListener() {
  93                 @Override
  94                 public void operationComplete(final ChannelFuture future) {
  95                     synchronized (lock) {
  96                         sessionReg.removeSessionReference(clientAddress);
  97                     }
  98                 }
  99             });
 100
 101             LOG.info("Replacing bootstrap negotiator for channel {}", this.channel);
 102             this.channel.pipeline().replace(this, "negotiator", n);
 103             n.startNegotiation();
 104         }
 105     }
 106
 107     protected void handleMessage(final Message msg) {
 108         throw new IllegalStateException("Bootstrap negotiator should have been replaced");
 109     }
 110 }