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