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