/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.jmeter.visualizers;

import java.io.Serializable;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

import org.apache.jmeter.samplers.Clearable;
import org.apache.jmeter.samplers.SampleResult;
import org.apache.jorphan.logging.LoggingManager;
import org.apache.log.Logger;

/**
 * The model that collects the average of the set of pages to be sampled.
 * 
 */

public class GraphAccumModel implements Clearable, Serializable {
	private static final Logger log = LoggingManager.getLoggerForClass();

	protected String name;

	protected List samples;

	protected List listeners;

	protected long averageSum = 0;

	protected long variationSum = 0;

	protected long counter = 0;

	protected long previous = 0;

	protected long max = 1;

	protected boolean bigChange = false;

	protected SampleResult current;

	/**
	 * Constructor.
	 */
	public GraphAccumModel() {
		log.debug("Start : GraphAccumModel1");
		listeners = new LinkedList();
		samples = Collections.synchronizedList(new LinkedList());
		log.debug("End : GraphAccumModel1");
	}

	/**
	 * Sets the Name attribute of the GraphModel object.
	 * 
	 * @param name
	 *            the new Name value
	 */
	public void setName(String name) {
		this.name = name;
	}

	/**
	 * Gets the SampleCount attribute of the GraphAccumModel object.
	 * 
	 * @return the SampleCount value
	 */
	public int getSampleCount() {
		return samples.size();
	}

	/**
	 * Gets the List attribute of the GraphAccumModel object.
	 * 
	 * @return the List value
	 */
	public List getList() {
		return samples;
	}

	/**
	 * Gets the Name attribute of the GraphModel object.
	 * 
	 * @return the Name value
	 */
	public String getName() {
		return name;
	}

	/**
	 * Gets the Max attribute of the GraphAccumModel object.
	 * 
	 * @return the Max value
	 */
	public long getMax() {
		log.debug("getMax1 : Returning - " + max);
		return max;
	}

	/**
	 * Adds a feature to the ModelListener attribute of the GraphAccumModel
	 * object.
	 * 
	 * @param listener
	 *            the feature to be added to the GraphAccumListener attribute.
	 */
	public void addGraphAccumListener(GraphAccumListener listener) {
		listeners.add(listener);
	}

	/**
	 * Clear the results.
	 */
	public void clearData() {
		log.debug("Start : clear1");
		samples.clear();
		max = 1;
		bigChange = true;
		this.fireDataChanged();
		log.debug("End : clear1");
	}

	/**
	 * Add the new sample to the results.
	 * 
	 * @param res
	 *            sample containing the results
	 */
	public void addNewSample(SampleResult res) {
		log.debug("Start : addNewSample1");
		// Set time to time taken to load this url without components (e.g.
		// images etc)
		long totalTime = res.getTime();

		if (log.isDebugEnabled()) {
			log.debug("addNewSample1 : time - " + totalTime);
			log.debug("addNewSample1 : max - " + max);
		}
		if (totalTime > max) {
			bigChange = true;
			max = totalTime;
		}
		current = res;
		samples.add(res);
		log.debug("End : addNewSample1");
		fireDataChanged();
	}

	/**
	 * Depending on whether the graph needs to be rescale call the appropriate
	 * methods.
	 */
	protected void fireDataChanged() {
		log.debug("Start : fireDataChanged1");
		Iterator iter = listeners.iterator();

		if (bigChange) {
			while (iter.hasNext()) {
				((GraphAccumListener) iter.next()).updateGui();
			}
			bigChange = false;
		} else {
			quickUpdate(current);
		}
		log.debug("End : fireDataChanged1");
	}

	/**
	 * The sample to be added did not exceed the current set of samples so do
	 * not need to rescale graph.
	 */
	protected void quickUpdate(SampleResult s) {
		Iterator iter = listeners.iterator();
		{
			while (iter.hasNext()) {
				((GraphAccumListener) iter.next()).updateGui(s);
			}
		}
	}
}
