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/*
* Copyright 2014 Open Networking Laboratory
*
* 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.onosproject.openflow.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);
}
}
}
}
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