2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
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
8 package org.opendaylight.protocol.framework;
10 import io.netty.bootstrap.Bootstrap;
11 import io.netty.channel.ChannelFuture;
12 import io.netty.channel.ChannelFutureListener;
13 import io.netty.channel.ChannelOption;
14 import io.netty.util.concurrent.DefaultPromise;
15 import io.netty.util.concurrent.Future;
16 import io.netty.util.concurrent.FutureListener;
17 import io.netty.util.concurrent.Promise;
19 import java.net.InetSocketAddress;
21 import javax.annotation.concurrent.GuardedBy;
22 import javax.annotation.concurrent.ThreadSafe;
24 import org.slf4j.Logger;
25 import org.slf4j.LoggerFactory;
27 import com.google.common.base.Preconditions;
30 final class ProtocolSessionPromise<S extends ProtocolSession<?>> extends DefaultPromise<S> {
31 private static final Logger LOG = LoggerFactory.getLogger(ProtocolSessionPromise.class);
32 private final ReconnectStrategy strategy;
33 private final InetSocketAddress address;
34 private final Bootstrap b;
37 private Future<?> pending;
39 ProtocolSessionPromise(final InetSocketAddress address, final ReconnectStrategy strategy, final Bootstrap b) {
40 this.strategy = Preconditions.checkNotNull(strategy);
41 this.address = Preconditions.checkNotNull(address);
42 this.b = Preconditions.checkNotNull(b);
45 synchronized void connect() {
46 final Object lock = this;
49 final int timeout = this.strategy.getConnectTimeout();
51 LOG.debug("Promise {} attempting connect for {}ms", lock, timeout);
53 this.b.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, timeout);
54 this.pending = this.b.connect(this.address).addListener(new ChannelFutureListener() {
56 public void operationComplete(final ChannelFuture cf) throws Exception {
59 LOG.debug("Promise {} connection resolved", lock);
61 // Triggered when a connection attempt is resolved.
62 Preconditions.checkState(ProtocolSessionPromise.this.pending == cf);
65 * The promise we gave out could have been cancelled,
66 * which cascades to the connect getting cancelled,
67 * but there is a slight race window, where the connect
68 * is already resolved, but the listener has not yet
69 * been notified -- cancellation at that point won't
70 * stop the notification arriving, so we have to close
75 LOG.debug("Closing channel for cancelled promise {}", lock);
81 if (!cf.isSuccess()) {
82 final Future<Void> rf = ProtocolSessionPromise.this.strategy.scheduleReconnect(cf.cause());
83 rf.addListener(new FutureListener<Void>() {
85 public void operationComplete(final Future<Void> sf) {
87 // Triggered when a connection attempt is to be made.
88 Preconditions.checkState(ProtocolSessionPromise.this.pending == sf);
91 * The promise we gave out could have been cancelled,
92 * which cascades to the reconnect attempt getting
93 * cancelled, but there is a slight race window, where
94 * the reconnect attempt is already enqueued, but the
95 * listener has not yet been notified -- if cancellation
96 * happens at that point, we need to catch it here.
102 setFailure(sf.cause());
109 ProtocolSessionPromise.this.pending = rf;
111 LOG.debug("Promise {} connection successful", lock);
116 } catch (final Exception e) {
122 public synchronized boolean cancel(final boolean mayInterruptIfRunning) {
123 if (super.cancel(mayInterruptIfRunning)) {
124 this.pending.cancel(mayInterruptIfRunning);
132 public synchronized Promise<S> setSuccess(final S result) {
133 LOG.debug("Promise {} completed", this);
134 this.strategy.reconnectSuccessful();
135 return super.setSuccess(result);