/**
*    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 net.floodlightcontroller.core.internal;

import java.util.concurrent.ThreadPoolExecutor;

import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.handler.execution.ExecutionHandler;
import org.jboss.netty.handler.timeout.IdleStateHandler;
import org.jboss.netty.handler.timeout.ReadTimeoutHandler;
import org.jboss.netty.util.ExternalResourceReleasable;
import org.jboss.netty.util.HashedWheelTimer;
import org.jboss.netty.util.Timer;

/**
 * Creates a ChannelPipeline for a server-side openflow channel
 * @author readams
 */
public class OpenflowPipelineFactory
    implements ChannelPipelineFactory, ExternalResourceReleasable {

    private static final long HANDSHAKE_TIMEOUT_SECS = 10;
    protected Controller controller;
    protected ThreadPoolExecutor pipelineExecutor;
    protected Timer timer;
    protected IdleStateHandler idleHandler;
    protected ReadTimeoutHandler readTimeoutHandler;

    public OpenflowPipelineFactory(Controller controller,
                                   ThreadPoolExecutor pipelineExecutor) {
        super();
        this.controller = controller;
        this.pipelineExecutor = pipelineExecutor;
        this.timer = new HashedWheelTimer();
        this.idleHandler = new IdleStateHandler(timer, 20, 25, 0);
        this.readTimeoutHandler = new ReadTimeoutHandler(timer, 30);
    }

    @Override
    public ChannelPipeline getPipeline() throws Exception {
        OFChannelHandler handler = new OFChannelHandler(controller);

        ChannelPipeline pipeline = Channels.pipeline();
        pipeline.addLast("ofmessagedecoder", new OFMessageDecoder());
        pipeline.addLast("ofmessageencoder", new OFMessageEncoder());
        pipeline.addLast("idle", idleHandler);
        pipeline.addLast("timeout", readTimeoutHandler);
        pipeline.addLast("handshaketimeout",
                new HandshakeTimeoutHandler(handler, timer, HANDSHAKE_TIMEOUT_SECS));
        if (pipelineExecutor != null)
            pipeline.addLast("pipelineExecutor",
                             new ExecutionHandler(pipelineExecutor));
        pipeline.addLast("handler", handler);
        return pipeline;
    }

    @Override
    public void releaseExternalResources() {
        timer.stop();
    }
}