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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2011, Red Hat, Inc. and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.mobicents.media.server.component.oob;

import java.util.Iterator;

import org.mobicents.media.server.concurrent.ConcurrentMap;
import org.mobicents.media.server.scheduler.PriorityQueueScheduler;
import org.mobicents.media.server.scheduler.Task;
import org.mobicents.media.server.spi.memory.Frame;

/**
 * Implements compound oob splitter , one of core components of mms 3.0
 * 
 * @author Yulian Oifa
 */
public class OOBSplitter {
	// scheduler for mixer job scheduling
	private PriorityQueueScheduler scheduler;

	// The pools of components
	private ConcurrentMap insideComponents = new ConcurrentMap();
	private ConcurrentMap outsideComponents = new ConcurrentMap();

	private Iterator insideRIterator = insideComponents.valuesIterator();
	private Iterator insideSIterator = insideComponents.valuesIterator();

	private Iterator outsideRIterator = outsideComponents.valuesIterator();
	private Iterator outsideSIterator = outsideComponents.valuesIterator();

	private InsideMixTask insideMixer;
	private OutsideMixTask outsideMixer;
	private volatile boolean started = false;

	protected long mixCount = 0;

	public OOBSplitter(PriorityQueueScheduler scheduler) {
		this.scheduler = scheduler;
		this.insideMixer = new InsideMixTask();
		this.outsideMixer = new OutsideMixTask();
	}

	public void addInsideComponent(OOBComponent component) {
		insideComponents.put(component.getComponentId(), component);
	}

	public void addOutsideComponent(OOBComponent component) {
		outsideComponents.put(component.getComponentId(), component);
	}

	/**
	 * Releases inside component
	 * 
	 * @param component
	 */
	public void releaseInsideComponent(OOBComponent component) {
		insideComponents.remove(component.getComponentId());
	}

	/**
	 * Releases outside component
	 * 
	 * @param component
	 */
	public void releaseOutsideComponent(OOBComponent component) {
		outsideComponents.remove(component.getComponentId());
	}

	public void start() {
		mixCount = 0;
		started = true;
		scheduler.submit(insideMixer, PriorityQueueScheduler.MIXER_MIX_QUEUE);
		scheduler.submit(outsideMixer, PriorityQueueScheduler.MIXER_MIX_QUEUE);
	}

	public void stop() {
		started = false;
		insideMixer.cancel();
		outsideMixer.cancel();
	}

	private class InsideMixTask extends Task {

	    public InsideMixTask() {
			super();
		}

		@Override
		public int getQueueNumber() {
			return PriorityQueueScheduler.MIXER_MIX_QUEUE;
		}

		@Override
		public long perform() {
		    Frame current = null;

		    // summarize all
			insideRIterator = insideComponents.valuesIterator();
			while (insideRIterator.hasNext()) {
				OOBComponent component = insideRIterator.next();
				component.perform();
				current = component.getData();
				if (current != null) {
					break;
				}
			}

			if (current == null) {
				scheduler.submit(this, PriorityQueueScheduler.MIXER_MIX_QUEUE);
				mixCount++;
				return 0;
			}

			// get data for each component
			outsideSIterator = outsideComponents.valuesIterator();
			while (outsideSIterator.hasNext()) {
				OOBComponent component = outsideSIterator.next();
				if (!outsideSIterator.hasNext()) {
					component.offer(current);
				} else {
					component.offer(current.clone());
				}
			}

			scheduler.submit(this, PriorityQueueScheduler.MIXER_MIX_QUEUE);
			mixCount++;
			return 0;
		}
	}

	private class OutsideMixTask extends Task {

		public OutsideMixTask() {
			super();
		}

		@Override
		public int getQueueNumber() {
			return PriorityQueueScheduler.MIXER_MIX_QUEUE;
		}

		@Override
		public long perform() {
		    Frame current = null;
		    
			// summarize all
			outsideRIterator = outsideComponents.valuesIterator();
			while (outsideRIterator.hasNext()) {
				OOBComponent component = outsideRIterator.next();
				component.perform();
				current = component.getData();
				if (current != null) {
					break;
				}
			}

			if (current == null) {
				scheduler.submit(this, PriorityQueueScheduler.MIXER_MIX_QUEUE);
				mixCount++;
				return 0;
			}

			// get data for each component
			insideSIterator = insideComponents.valuesIterator();
			while (insideSIterator.hasNext()) {
				OOBComponent component = insideSIterator.next();
				if (!insideSIterator.hasNext()) {
					component.offer(current);
				} else {
					component.offer(current.clone());
				}
			}

			scheduler.submit(this, PriorityQueueScheduler.MIXER_MIX_QUEUE);
			mixCount++;
			return 0;
		}
	}
}