GC日志监听器

这是一款基于LGame-Simple-0.2.5的小应用，能够针对用户指定的GC日志文件（仅限Sun JRE生成的）进行简单分析。PS：此示例中吾辈对图表的动态绘制也进行了初步尝试（比较痛苦到底是该封装jfreechart之类的图形库好，还是该自己写套小型图形库用的方便……不过那是N往后的计划了……）。

从技术角度来讲，此例并非一个完整的GC日志分析工具，而仅仅是一个用以显示GC日志数据的监听器。它的实现机理堪称简单至极，不过是利用-Xloggc输出JVM的GC记录，再以正则表达式解析到图表中显示罢了（当然，HPjtnue也是这样玩的）。

因此，隐藏在这个简单示例背后，如何更为高效，准确，有价值的分析出必要数据的方式以及方法，才是我们应该思考的问题（只对Java2D感兴趣的就研制表格绘制好了……）。

下载地址（将批处理中的gc日志地址改为需要监听的日志地址即可使用） ：http://loon-simple.googlecode.com/files/GCLog.7z

执行部分代码如下（详细代码在jar中）：

package org.loon.test;
import java.awt.Graphics2D;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import org.loon.framework.game.simple.GameScene;
import org.loon.framework.game.simple.core.LSystem;
import org.loon.framework.game.simple.core.graphics.Deploy;
import org.loon.framework.game.simple.core.graphics.Screen;
/**
 * 
 * Copyright 2008 - 2009
 * 
 * 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.
 * 
 * @project loonframework
 * @author chenpeng
 * @email：[e-mail]
 * @version 0.1
 */
public class Main extends Screen {
	private ChartSprite chart;
	private GC gc;
	public Main(String fileName) {
		this.gc = new GCLog(fileName);
		this.chart = new ChartSprite(getWidth(), getHeight());
		this.chart.showLegendOnRight();
		this.chart.setXDescription("Run Time");
		this.chart.setYDescription("bytes");
		this.chart.setShowSmallSquares(6);
		this.chart.setTitle("GC Line2D Chart");
		this.chart.setMaxValue(20000);
		this.chart.setValsDescription("0,0,0,0,0,0");
		this.chart.addComp("0,0,0,0,0,0", "Used");
		this.chart.addComp("0,0,0,0,0,0", "Free");
		this.chart.addComp("0,0,0,0,0,0", "Total");
		this.add(chart);
		Thread thread = new Thread() {
			public void run() {
				while (true) {
					GCData m = gc.read();
					if (m != null) {
						chart.updateComp(0, m.getUsedMemory());
						chart.updateComp(1, m.getFreeMemory());
						chart.updateComp(2, m.getTotalMemory());
						chart.updateDescription(m.getTime());
					}
					try {
						Thread.sleep(LSystem.SECOND);
					} catch (InterruptedException e) {
					}
				}
			}
		};
		thread.start();
	}
	public void draw(Graphics2D g) {
	}
	public void leftClick(MouseEvent e) {
	}
	public void middleClick(MouseEvent e) {
	}
	public void rightClick(MouseEvent e) {
	}
	public void onKey(KeyEvent e) {
	}
	public void onKeyUp(KeyEvent e) {
	}
	public static void main(final String[] args) {
		if (args.length == 0) {
			return;
		}
		GameScene frame = new GameScene("GC日志监听器", 480, 360);
		Deploy deploy = frame.getDeploy();
		deploy.setScreen(new Main(args[0]));
		deploy.setShowFPS(false);
		deploy.setLogo(false);
		deploy.setFPS(30);
		deploy.mainLoop();
		frame.showFrame();
	}
}

下载地址（将批处理中的gc日志地址改为需要监听的日志地址即可使用） ：http://loon-simple.googlecode.com/files/GCLog.7z