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 static java.util.Objects.requireNonNull;
  11
  12 import com.google.common.base.Preconditions;
  13 import io.netty.bootstrap.Bootstrap;
  14 import io.netty.channel.ChannelFuture;
  15 import io.netty.channel.ChannelFutureListener;
  16 import io.netty.channel.ChannelOption;
  17 import io.netty.channel.EventLoop;
  18 import io.netty.util.concurrent.DefaultPromise;
  19 import io.netty.util.concurrent.EventExecutor;
  20 import io.netty.util.concurrent.Future;
  21 import io.netty.util.concurrent.Promise;
  22 import java.net.InetSocketAddress;
  23 import java.util.concurrent.TimeUnit;
  24 import javax.annotation.concurrent.GuardedBy;
  25 import javax.annotation.concurrent.ThreadSafe;
  26 import org.opendaylight.protocol.pcep.PCEPSession;
  27 import org.slf4j.Logger;
  28 import org.slf4j.LoggerFactory;
  29
  30 @ThreadSafe
  31 public final class PCEPProtocolSessionPromise<S extends PCEPSession> extends DefaultPromise<S> {
  32     private static final Logger LOG = LoggerFactory.getLogger(PCEPProtocolSessionPromise.class);
  33     private InetSocketAddress address;
  34     private final int retryTimer;
  35     private final int connectTimeout;
  36     private final Bootstrap b;
  37     @GuardedBy("this")
  38     private Future<?> pending;
  39
  40     PCEPProtocolSessionPromise(final EventExecutor executor, final InetSocketAddress address,
  41             final int retryTimer, final int connectTimeout, final Bootstrap b) {
  42         super(executor);
  43         this.address = requireNonNull(address);
  44         this.retryTimer = retryTimer;
  45         this.connectTimeout = connectTimeout;
  46         this.b = requireNonNull(b);
  47     }
  48
  49     synchronized void connect() {
  50         final PCEPProtocolSessionPromise<?> lock = this;
  51
  52         try {
  53             LOG.debug("Promise {} attempting connect for {}ms", lock, this.connectTimeout);
  54             if (this.address.isUnresolved()) {
  55                 this.address = new InetSocketAddress(this.address.getHostName(), this.address.getPort());
  56             }
  57
  58             this.b.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, this.connectTimeout);
  59             this.b.remoteAddress(this.address);
  60             final ChannelFuture connectFuture = this.b.connect();
  61             connectFuture.addListener(new BootstrapConnectListener());
  62             this.pending = connectFuture;
  63         } catch (Exception e) {
  64             LOG.info("Failed to connect to {}", this.address, e);
  65             this.setFailure(e);
  66         }
  67     }
  68
  69     @Override
  70     public synchronized boolean cancel(final boolean mayInterruptIfRunning) {
  71         if (super.cancel(mayInterruptIfRunning)) {
  72             this.pending.cancel(mayInterruptIfRunning);
  73             return true;
  74         }
  75
  76         return false;
  77     }
  78
  79     @Override
  80     public synchronized Promise<S> setSuccess(final S result) {
  81         LOG.debug("Promise {} completed", this);
  82         return super.setSuccess(result);
  83     }
  84
  85     private class BootstrapConnectListener implements ChannelFutureListener {
  86         @Override
  87         public void operationComplete(final ChannelFuture cf) {
  88             synchronized (PCEPProtocolSessionPromise.this) {
  89                 PCEPProtocolSessionPromise.LOG.debug("Promise {} connection resolved",
  90                         PCEPProtocolSessionPromise.this);
  91                 Preconditions.checkState(PCEPProtocolSessionPromise.this.pending.equals(cf));
  92                 if (PCEPProtocolSessionPromise.this.isCancelled()) {
  93                     if (cf.isSuccess()) {
  94                         PCEPProtocolSessionPromise.LOG.debug("Closing channel for cancelled promise {}",
  95                                 PCEPProtocolSessionPromise.this);
  96                         cf.channel().close();
  97                     }
  98                 } else if (cf.isSuccess()) {
  99                     PCEPProtocolSessionPromise.LOG.debug("Promise {} connection successful",
 100                             PCEPProtocolSessionPromise.this);
 101                 } else {
 102                     PCEPProtocolSessionPromise.LOG.debug("Attempt to connect to {} failed",
 103                             PCEPProtocolSessionPromise.this.address, cf.cause());
 104
 105                     if (PCEPProtocolSessionPromise.this.retryTimer == 0) {
 106                         PCEPProtocolSessionPromise.LOG
 107                                 .debug("Retry timer value is 0. Reconnection will not be attempted");
 108                         PCEPProtocolSessionPromise.this.setFailure(cf.cause());
 109                         return;
 110                     }
 111
 112                     final EventLoop loop = cf.channel().eventLoop();
 113                     loop.schedule(() -> {
 114                         synchronized (PCEPProtocolSessionPromise.this) {
 115                             PCEPProtocolSessionPromise.LOG.debug("Attempting to connect to {}",
 116                                     PCEPProtocolSessionPromise.this.address);
 117                             final Future<Void> reconnectFuture = PCEPProtocolSessionPromise.this.b.connect();
 118                             reconnectFuture.addListener(BootstrapConnectListener.this);
 119                             PCEPProtocolSessionPromise.this.pending = reconnectFuture;
 120                         }
 121                     }, PCEPProtocolSessionPromise.this.retryTimer, TimeUnit.SECONDS);
 122                     PCEPProtocolSessionPromise.LOG.debug("Next reconnection attempt in {}s",
 123                             PCEPProtocolSessionPromise.this.retryTimer);
 124                 }
 125             }
 126         }
 127     }
 128 }