CpuMetrics.java

/*
  CpuMetrics.java

  (c) 2011-2013 Edward Swartz

  All rights reserved. This program and the accompanying materials
  are made available under the terms of the Eclipse Public License v1.0
  which accompanies this distribution, and is available at
  http://www.eclipse.org/legal/epl-v10.html
 */
package v9t9.common.cpu;

import java.util.ArrayList;
import java.util.List;

import ejs.base.utils.ListenerList;
import ejs.base.utils.ListenerList.IFire;


/**
 * Track the metrics of the CPU
 * @author Ed
 *
 */
public class CpuMetrics implements ICpuMetrics {
 
	public interface IMetricsListener {
		void metricsChanged();
	}
	
	private ListenerList<IMetricsListener> metricsListeners;
	
	private ArrayList<MetricEntry> entries;
	public CpuMetrics() {
		entries = new ArrayList<MetricEntry>();
		metricsListeners = new ListenerList<IMetricsListener>();
	}
	
	/* (non-Javadoc)
	 * @see v9t9.emulator.runtime.cpu.ICpuMetrics#addListener(v9t9.emulator.runtime.cpu.CpuMetrics.IMetricsListener)
	 */
	@Override
	public void addListener(IMetricsListener listener) {
		metricsListeners.add(listener);
	}
	
	/* (non-Javadoc)
	 * @see v9t9.emulator.runtime.cpu.ICpuMetrics#removeListener(v9t9.emulator.runtime.cpu.CpuMetrics.IMetricsListener)
	 */
	@Override
	public void removeListener(IMetricsListener listener) {
		metricsListeners.remove(listener);
	}
	/* (non-Javadoc)
	 * @see v9t9.emulator.runtime.cpu.ICpuMetrics#log(long, long, int, int, int, long, long, long)
	 */
	@Override
	public void log(MetricEntry entry) {
        if (entry.getCycles() == 0) {
        	return;
        }
        
        //System.out.println(entry.toSummary());
        
        synchronized (entries) {
	        if (entries.size() >= 1024) 
	        	entries.subList(0, entries.size() - 512).clear();
	        	//entries = new ArrayList<MetricEntry>(entries.subList(entries.size() - 512, entries.size()));
	        
			entries.add(entry);
        }
		
        //nLastCycleCount = totalCycles;
        
        fireListeners();
	}
	private void fireListeners() {
		metricsListeners.fire(new IFire<CpuMetrics.IMetricsListener>() {

			@Override
			public void fire(IMetricsListener listener) {
				try {
					listener.metricsChanged();
				} catch (Throwable t) {
					t.printStackTrace();
				}
			}
		});
	}

	/* (non-Javadoc)
	 * @see v9t9.emulator.runtime.cpu.ICpuMetrics#getLastEntries(int)
	 */
	@Override
	public MetricEntry[] getLastEntries(int x) {
		synchronized (entries) {
			int idx = Math.max(0, entries.size() - x);
			List<MetricEntry> subList = entries.subList(idx, entries.size());
			return subList.toArray(new MetricEntry[subList.size()]);
		}
	}

	/* (non-Javadoc)
	 * @see v9t9.emulator.runtime.cpu.ICpuMetrics#getEntry(int, int)
	 */
	@Override
	public MetricEntry getEntry(int i, int of) {
		synchronized (entries) {
			int idx = Math.max(0, entries.size() - of);
			if (idx + i >= 0  && idx + i < entries.size())
				return entries.get(idx + i);
		}
		return null;
	}

	/* (non-Javadoc)
	 * @see v9t9.emulator.runtime.cpu.ICpuMetrics#resetLastCycleCount()
	 */
	//@Override
	//public void resetLastCycleCount() {
	//	nLastCycleCount = 0;
	//}
	
}