bgp/rib-impl/src/main/java/org/opendaylight/protocol/bgp/rib/impl/protocol/BGPProtocolSessionPromise.java

   1 /*
   2  * Copyright (c) 2015 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.bgp.rib.impl.protocol;
   9
  10 import com.google.common.base.Preconditions;
  11 import io.netty.bootstrap.Bootstrap;
  12 import io.netty.channel.ChannelFuture;
  13 import io.netty.channel.ChannelFutureListener;
  14 import io.netty.channel.ChannelOption;
  15 import io.netty.channel.EventLoop;
  16 import io.netty.util.concurrent.DefaultPromise;
  17 import io.netty.util.concurrent.Future;
  18 import io.netty.util.concurrent.GlobalEventExecutor;
  19 import io.netty.util.concurrent.Promise;
  20 import java.net.InetSocketAddress;
  21 import java.util.concurrent.TimeUnit;
  22 import javax.annotation.concurrent.GuardedBy;
  23 import org.opendaylight.protocol.bgp.rib.spi.BGPSession;
  24 import org.slf4j.Logger;
  25 import org.slf4j.LoggerFactory;
  26
  27 public class BGPProtocolSessionPromise<S extends BGPSession> extends DefaultPromise<S> {
  28     private static final Logger LOG = LoggerFactory.getLogger(BGPProtocolSessionPromise.class);
  29     private static final int CONNECT_TIMEOUT = 5000;
  30
  31     private InetSocketAddress address;
  32     private final int retryTimer;
  33     private final Bootstrap bootstrap;
  34     @GuardedBy("this")
  35     private ChannelFuture pending;
  36
  37     public BGPProtocolSessionPromise(InetSocketAddress remoteAddress, int retryTimer, Bootstrap bootstrap) {
  38         super(GlobalEventExecutor.INSTANCE);
  39         this.address = Preconditions.checkNotNull(remoteAddress);
  40         this.retryTimer = retryTimer;
  41         this.bootstrap = Preconditions.checkNotNull(bootstrap);
  42     }
  43
  44     public synchronized void connect() {
  45         final BGPProtocolSessionPromise lock = this;
  46
  47         try {
  48             LOG.debug("Promise {} attempting connect for {}ms", lock, Integer.valueOf(CONNECT_TIMEOUT));
  49             if (this.address.isUnresolved()) {
  50                 this.address = new InetSocketAddress(this.address.getHostName(), this.address.getPort());
  51             }
  52
  53             this.bootstrap.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, CONNECT_TIMEOUT);
  54             this.bootstrap.remoteAddress(this.address);
  55             final ChannelFuture connectFuture = this.bootstrap.connect();
  56             connectFuture.addListener(new BGPProtocolSessionPromise.BootstrapConnectListener(lock));
  57             this.pending = connectFuture;
  58         } catch (Exception e) {
  59             LOG.info("Failed to connect to {}", this.address, e);
  60             this.setFailure(e);
  61         }
  62     }
  63
  64     public synchronized void reconnect() {
  65         if (this.retryTimer == 0) {
  66             LOG.debug("Retry timer value is 0. Reconnection will not be attempted");
  67             this.setFailure(this.pending.cause());
  68             return;
  69         }
  70
  71         final BGPProtocolSessionPromise lock = this;
  72         final EventLoop loop = this.pending.channel().eventLoop();
  73         loop.schedule(new Runnable() {
  74             @Override
  75             public void run() {
  76                 LOG.debug("Attempting to connect to {}", BGPProtocolSessionPromise.this.address);
  77                 final ChannelFuture reconnectFuture = BGPProtocolSessionPromise.this.bootstrap.connect();
  78                 reconnectFuture.addListener(new BootstrapConnectListener(lock));
  79                 BGPProtocolSessionPromise.this.pending = reconnectFuture;
  80             }
  81         }, this.retryTimer, TimeUnit.SECONDS);
  82         LOG.debug("Next reconnection attempt in {}s", this.retryTimer);
  83     }
  84
  85     @Override
  86     public synchronized boolean cancel(final boolean mayInterruptIfRunning) {
  87         if (super.cancel(mayInterruptIfRunning)) {
  88             this.pending.cancel(mayInterruptIfRunning);
  89             return true;
  90         } else {
  91             return false;
  92         }
  93     }
  94
  95     @Override
  96     public synchronized Promise<S> setSuccess(final S result) {
  97         LOG.debug("Promise {} completed", this);
  98         return super.setSuccess(result);
  99     }
 100
 101     private class BootstrapConnectListener implements ChannelFutureListener {
 102         private final Object lock;
 103
 104         public BootstrapConnectListener(final Object lock) {
 105             this.lock = lock;
 106         }
 107
 108         @Override
 109         public void operationComplete(final ChannelFuture channelFuture) throws Exception {
 110             synchronized (this.lock) {
 111                 BGPProtocolSessionPromise.LOG.debug("Promise {} connection resolved", this.lock);
 112                 Preconditions.checkState(BGPProtocolSessionPromise.this.pending.equals(channelFuture));
 113                 if (BGPProtocolSessionPromise.this.isCancelled()) {
 114                     if (channelFuture.isSuccess()) {
 115                         BGPProtocolSessionPromise.LOG.debug("Closing channel for cancelled promise {}", this.lock);
 116                         channelFuture.channel().close();
 117                     }
 118                 } else if (channelFuture.isSuccess()) {
 119                     BGPProtocolSessionPromise.LOG.debug("Promise {} connection successful", this.lock);
 120                 } else {
 121                     BGPProtocolSessionPromise.LOG.debug("Attempt to connect to {} failed", BGPProtocolSessionPromise.this.address, channelFuture.cause());
 122                     BGPProtocolSessionPromise.this.reconnect();
 123                 }
 124             }
 125         }
 126     }
 127 }