Ezアプリ(J)メモ、アプリ内でのシステムスレッドに関して(スレッドセーフなアプリを目指して) Canvas ver.

MEMO.txt

スレッドセーフなアプリを作るため
システムスレッドに関する実験をしてみた
実験に使用したコードも添付する

アプリの状態遷移やキー入力などでどのスレッドが呼ばれるのか

３つのシステムスレッドを確認できた

スレッドＡ
　MIDletのコンストラクタ生成


スレッドＢ
　MIDletのstartApp,destroyApp,pauseAppのイベント


スレッドＣ
　CommandListenerのcommandActionのイベント
　CanvasのkeyPressed,keyRepeated,keyReleased,paintのイベント
 
 
 
 
実験の出力結果


EZAPLI(J) Emulator
Copyright 2010-2011 KDDI Corporation. All rights reserved.
MIDlet constructer: 223940028
myapp.ThreatTest@1a4cfaaa 100
MIDlet startApp: 481523300
make thread: -131535512
Canvas paint: -368117631
GameCanvas keyReleased[-6]: -368117631
MIDlet commandAction midlet.command: -368117631
GameCanvas keyReleased[-7]: -368117631
MIDlet commandAction canvas.command: -368117631
switch commandAction: from midlet to canvas
GameCanvas keyReleased[-7]: -368117631
Canvas commandAction canvas.command: -368117631
GameCanvas keyReleased[-6]: -368117631
Canvas commandAction midlet.command: -368117631
switch commandAction: from canvas to midlet
GameCanvas keyPressed[53]: -368117631
loop: -131535512
GameCanvas keyReleased[53]: -368117631
GameCanvas keyPressed[55]: -368117631
GameCanvas keyReleased[55]: -368117631
GameCanvas keyPressed[54]: -368117631
GameCanvas keyReleased[54]: -368117631
GameCanvas keyPressed[54]: -368117631
GameCanvas keyRepeated[54]: -368117631
GameCanvas keyReleased[54]: -368117631
myapp.ThreatTest@1a4cfaaa 103
MIDlet pauseApp: 481523300
myapp.ThreatTest@1a4cfaaa 0
myapp.ThreatTest@1a4cfaaa 0
myapp.ThreatTest@1a4cfaaa 100
MIDlet startApp: 481523300
Canvas paint: -368117631
myapp.ThreatTest@1a4cfaaa 103
MIDlet pauseApp: 481523300
myapp.ThreatTest@1a4cfaaa 0
myapp.ThreatTest@1a4cfaaa 0
myapp.ThreatTest@1a4cfaaa 7
MIDlet destroyApp: 481523300

TestCanvas.java

package myapp;

import java.util.Random;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.game.GameCanvas;

public class TestCanvas extends GameCanvas implements Runnable, CommandListener {

	static Command command = null;

	Random random = null;
	
	public TestCanvas() {
		super(false);
		command = new Command("CANV", Command.SCREEN, 2);
		addCommand(command);
		random = new Random();
	}

	public void run() {
		Graphics graphics = getGraphics();
		long wait0, wait1;
		for (;;) {
			wait0 = System.currentTimeMillis() + 200L;

			int keyState = getKeyStates();

			if (keyState == FIRE_PRESSED) {
				System.out
						.println("loop: " + Thread.currentThread().hashCode());
			} else if (keyState == GAME_C_PRESSED) {
				int x0 = random.nextInt(240);
				int y0 = random.nextInt(240);
				int x1 = random.nextInt(240);
				int y1 = random.nextInt(240);
				int r = 0xFF >> (random.nextInt(3) * 8);
				int g = 0xFF >> (random.nextInt(3) * 8);
				int b = 0xFF >> (random.nextInt(3) * 8);
				graphics.setColor(r,	g, b);
				graphics.drawLine(x0, y0, x1, y1);
				flushGraphics();
			}

			do {
				wait1 = System.currentTimeMillis();
			} while (wait1 < wait0);
		}
	}

	protected void keyPressed(int keyCode) {
		System.out.println("GameCanvas keyPressed[" + keyCode + "]: "
				+ Thread.currentThread().hashCode());
		super.keyPressed(keyCode);
	}

	public void commandAction(Command c, Displayable d) {
		if (c == command) {
			System.out.println("Canvas commandAction canvas.command: "
					+ Thread.currentThread().hashCode());
		}
		if (c == ThreadTest.command) {
			System.out.println("Canvas commandAction midlet.command: "
					+ Thread.currentThread().hashCode());
			setCommandListener(ThreadTest.instance);
			System.out.println("switch commandAction: from canvas to midlet");
		}
	}

	protected void keyReleased(int keyCode) {
		System.out.println("GameCanvas keyReleased[" + keyCode + "]: "
				+ Thread.currentThread().hashCode());
		super.keyReleased(keyCode);
	}

	protected void keyRepeated(int keyCode) {
		System.out.println("GameCanvas keyRepeated[" + keyCode + "]: "
				+ Thread.currentThread().hashCode());
		super.keyRepeated(keyCode);
	}

	public void paint(Graphics g) {
		System.out.println("Canvas paint: " + Thread.currentThread().hashCode());
		super.paint(g);
	}

}

ThreadTest.java

package myapp;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class ThreadTest extends MIDlet implements CommandListener {

	static ThreadTest instance = null;
	static Command command = null;
	TestCanvas canvas = null;
	Thread thread = null;

	public ThreadTest() {
		System.out.println("MIDlet constructer: "
				+ Thread.currentThread().hashCode());
		command = new Command("MIDL", Command.SCREEN, 1);
		canvas = new TestCanvas();
		canvas.addCommand(command);
		canvas.setCommandListener(this);
		Display.getDisplay(this).setCurrent(canvas);
	}

	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		System.out.println("MIDlet destroyApp: "
				+ Thread.currentThread().hashCode());

	}

	protected void pauseApp() {
		System.out.println("MIDlet pauseApp: "
				+ Thread.currentThread().hashCode());

	}

	protected void startApp() throws MIDletStateChangeException {
		System.out.println("MIDlet startApp: "
				+ Thread.currentThread().hashCode());
		if (thread == null) {
			instance = this;
			thread = new Thread(canvas);
			System.out.println("make thread: " + thread.hashCode());
			thread.start();
		}
	}

	public void commandAction(Command c, Displayable d) {
		if (c == command) {
			System.out.println("MIDlet commandAction midlet.command: "
					+ Thread.currentThread().hashCode());
		}
		if (c == TestCanvas.command) {
			System.out.println("MIDlet commandAction canvas.command: "
					+ Thread.currentThread().hashCode());
			canvas.setCommandListener(canvas);
			System.out.println("switch commandAction: from midlet to canvas");
		}
	}

}