| /** |
| * Copyright 2011, Big Switch Networks, Inc. |
| * Originally created by David Erickson, Stanford University |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may |
| * not use this file except in compliance with the License. You may obtain |
| * a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations |
| * under the License. |
| **/ |
| |
| package org.onlab.onos.of.controller.impl; |
| |
| import java.util.concurrent.TimeUnit; |
| |
| import org.jboss.netty.channel.ChannelHandlerContext; |
| import org.jboss.netty.channel.ChannelStateEvent; |
| import org.jboss.netty.channel.Channels; |
| import org.jboss.netty.channel.SimpleChannelUpstreamHandler; |
| import org.jboss.netty.util.Timeout; |
| import org.jboss.netty.util.Timer; |
| import org.jboss.netty.util.TimerTask; |
| |
| /** |
| * Trigger a timeout if a switch fails to complete handshake soon enough. |
| */ |
| public class HandshakeTimeoutHandler |
| extends SimpleChannelUpstreamHandler { |
| static final HandshakeTimeoutException EXCEPTION = |
| new HandshakeTimeoutException(); |
| |
| final OFChannelHandler channelHandler; |
| final Timer timer; |
| final long timeoutNanos; |
| volatile Timeout timeout; |
| |
| public HandshakeTimeoutHandler(OFChannelHandler channelHandler, |
| Timer timer, |
| long timeoutSeconds) { |
| super(); |
| this.channelHandler = channelHandler; |
| this.timer = timer; |
| this.timeoutNanos = TimeUnit.SECONDS.toNanos(timeoutSeconds); |
| |
| } |
| |
| @Override |
| public void channelOpen(ChannelHandlerContext ctx, ChannelStateEvent e) |
| throws Exception { |
| if (timeoutNanos > 0) { |
| timeout = timer.newTimeout(new HandshakeTimeoutTask(ctx), |
| timeoutNanos, TimeUnit.NANOSECONDS); |
| } |
| ctx.sendUpstream(e); |
| } |
| |
| @Override |
| public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) |
| throws Exception { |
| if (timeout != null) { |
| timeout.cancel(); |
| timeout = null; |
| } |
| } |
| |
| private final class HandshakeTimeoutTask implements TimerTask { |
| |
| private final ChannelHandlerContext ctx; |
| |
| HandshakeTimeoutTask(ChannelHandlerContext ctx) { |
| this.ctx = ctx; |
| } |
| |
| @Override |
| public void run(Timeout t) throws Exception { |
| if (t.isCancelled()) { |
| return; |
| } |
| |
| if (!ctx.getChannel().isOpen()) { |
| return; |
| } |
| if (!channelHandler.isHandshakeComplete()) { |
| Channels.fireExceptionCaught(ctx, EXCEPTION); |
| } |
| } |
| } |
| } |