2 * Copyright (c) 2015 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.bgp.rib.impl.protocol;
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;
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;
31 private InetSocketAddress address;
32 private final int retryTimer;
33 private final Bootstrap bootstrap;
35 private Future<?> pending;
37 public BGPProtocolSessionPromise(InetSocketAddress address, int retryTimer, Bootstrap bootstrap) {
38 super(GlobalEventExecutor.INSTANCE);
39 this.address = Preconditions.checkNotNull(address);
40 this.retryTimer = retryTimer;
41 this.bootstrap = Preconditions.checkNotNull(bootstrap);
44 public synchronized void connect() {
45 final BGPProtocolSessionPromise lock = this;
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());
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);
65 public synchronized boolean cancel(final boolean mayInterruptIfRunning) {
66 if (super.cancel(mayInterruptIfRunning)) {
67 this.pending.cancel(mayInterruptIfRunning);
75 public synchronized Promise<S> setSuccess(final S result) {
76 LOG.debug("Promise {} completed", this);
77 return super.setSuccess(result);
80 private class BootstrapConnectListener implements ChannelFutureListener {
81 private final Object lock;
83 public BootstrapConnectListener(final Object lock) {
88 public void operationComplete(final ChannelFuture channelFuture) throws Exception {
89 synchronized (this.lock) {
90 BGPProtocolSessionPromise.LOG.debug("Promise {} connection resolved", this.lock);
91 Preconditions.checkState(BGPProtocolSessionPromise.this.pending.equals(channelFuture));
92 if (BGPProtocolSessionPromise.this.isCancelled()) {
93 if (channelFuture.isSuccess()) {
94 BGPProtocolSessionPromise.LOG.debug("Closing channel for cancelled promise {}", this.lock);
95 channelFuture.channel().close();
97 } else if (channelFuture.isSuccess()) {
98 BGPProtocolSessionPromise.LOG.debug("Promise {} connection successful", this.lock);
100 BGPProtocolSessionPromise.LOG.debug("Attempt to connect to {} failed", BGPProtocolSessionPromise.this.address, channelFuture.cause());
102 if (BGPProtocolSessionPromise.this.retryTimer == 0) {
103 BGPProtocolSessionPromise.LOG.debug("Retry timer value is 0. Reconnection will not be attempted");
104 BGPProtocolSessionPromise.this.setFailure(channelFuture.cause());
108 final EventLoop loop = channelFuture.channel().eventLoop();
109 loop.schedule(new Runnable() {
112 BGPProtocolSessionPromise.LOG.debug("Attempting to connect to {}", BGPProtocolSessionPromise.this.address);
113 final Future reconnectFuture = BGPProtocolSessionPromise.this.bootstrap.connect();
114 reconnectFuture.addListener(BGPProtocolSessionPromise.BootstrapConnectListener.this);
115 BGPProtocolSessionPromise.this.pending = reconnectFuture;
117 }, BGPProtocolSessionPromise.this.retryTimer, TimeUnit.SECONDS);
118 BGPProtocolSessionPromise.LOG.debug("Next reconnection attempt in {}s", BGPProtocolSessionPromise.this.retryTimer);