package javagapi;import javax.microedition.midlet.MIDlet;import javax.microedition.lcdui.Display;/*!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!             For speed, this is not threadsafe.	     However if the following assumptions hold,	     it should work.	     Assumptions made: read or write from	        byte or boolean is atomic operation.		The user will not press keys at a rate		that is faster than this thread can		handle them. The keys presses are stored		in an 8 slot circular buffer in GameShell.  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*//** (C) 2002 Sony Ericsson Mobile Communications AB. All rights reserved.  * Sends GATimerEvents periodically to a game.  * @author LD/SEM/GUN/MI Stefan Olsson, ecssnon  * @version 1.0  */class GameTimerThread extends Thread{    /** Used by GASetTimer and GAKillTimer to communicate the new period.      * A killed timer has the period Long.MAX_VALUE.      */    public long[] period = { Long.MAX_VALUE, Long.MAX_VALUE, Long.MAX_VALUE };    /** Used by GASetTimer and GAKillTimer to communicate to the thread the      * fact that the period has been updated.      */    public boolean[] periodUpdated = { false, false, false};    GameShell game;    MIDlet midlet;    /** GACheckForRefresh calls repaint() and       * sets this to false. The ensuing call to paint() sets it to true.      * While it is false, the game loop will only steal clock cycles,      * waiting for it to become true, so that the canvas will not repaint      * while the game is handling an event.      */    public boolean paintNotScheduled;    byte keysUpdated = 0;    /** Allocates a new GameTimerThread object. The purpose of this thread      * is to send all events except GAMenuSettingsEvent and GAStartEvent to      * the game.      * <p>      * As soon as game.gameMain returns false a GATerminateEvent is sent and      * the thread exits after the game has handled this event.      *      * @param g The game that will receive events.      */    public GameTimerThread(GameShell g){	game = g;    }    public void setMIDlet(MIDlet m) {	midlet = m;    }    /** Creates and dispatches events to the game. Once the game has begun,      * this thread will actually excecute the game code. There is only one      * GameTimerThread per game.      * <p>      * Please note that this method does a busy wait, i.e. it uses clock cycles      * even when waiting to dispatch the next timer event.      */    public void run() {	///*timer*/long t0;	///*timer*/long dt=0;	boolean notQuit = true;	GAEvent curEvent = new GAEvent();	int keyPos = -1;	long newT;	long[] oldT = new long[3];	oldT[0] = System.currentTimeMillis();	oldT[1] = oldT[0];	oldT[2] = oldT[0];	int i = 0;	long[] oldPeriod = new long[3];	try{	while(notQuit) {	    //System.out.println("Loop da loop! paintNotScheduled = "+paintNotScheduled);	    newT = System.currentTimeMillis();	    if(paintNotScheduled) {	    //System.out.println("keysUpdated = "+keysUpdated);	    if(keysUpdated>0) {		keysUpdated--;		keyPos++;		if(keyPos == 8) keyPos = 0;		curEvent.type = GameShell.GAKeyboardEvent;		curEvent.press = game.keyPressedArray[keyPos];		curEvent.key = game.keyArray[keyPos];		oldPeriod[0]=period[0];		oldPeriod[1]=period[1];		oldPeriod[2]=period[2];		//System.out.println("::::::Sending key event");		//System.out.println("MAIN THREAD SENDING KEY EVENT");		if(!game.gameMain(curEvent)) notQuit = false;		if(periodUpdated[0]) { if(oldPeriod[1]==Long.MAX_VALUE) oldT[1]=newT; periodUpdated[1]=false; }		if(periodUpdated[1]) { if(oldPeriod[1]==Long.MAX_VALUE) oldT[1]=newT; periodUpdated[1]=false; }		if(periodUpdated[2]) { if(oldPeriod[2]==Long.MAX_VALUE) oldT[2]=newT; periodUpdated[2]=false; }	    }	    else if(newT-oldT[0]>period[0]) {		//System.out.println("Timer thread 0 is late by "+(newT-oldT[0]-period[0])+" millis");		oldT[0] = newT;		curEvent.type = GameShell.GATimerEvent;		curEvent.timerId = 0;		//System.out.println("::::::Sending timer 0 event");		oldPeriod[1]=period[1];		oldPeriod[2]=period[2];		///*timer*/t0 = System.currentTimeMillis();		if(!game.gameMain(curEvent)) notQuit = false;		///*timer*/dt = System.currentTimeMillis()-t0;		//System.out.println("The call to game.gameMain took "+dt+" millis to execute");		if(periodUpdated[1]) { if(oldPeriod[1]==Long.MAX_VALUE) oldT[1]=newT; periodUpdated[1]=false; }		if(periodUpdated[2]) { if(oldPeriod[2]==Long.MAX_VALUE) oldT[2]=newT; periodUpdated[2]=false; }	    }	    else if(newT-oldT[1]>period[1]) {		//System.out.println("Timer thread 1 is late by "+(newT-oldT[1]-period[1])+" millis");		oldT[1] = newT;		curEvent.type = GameShell.GATimerEvent;		curEvent.timerId = 1;		//System.out.println("::::::Sending timer 1 event");		oldPeriod[0]=period[0];		oldPeriod[2]=period[2];		if(!game.gameMain(curEvent)) notQuit = false;		if(periodUpdated[0]) { if(oldPeriod[0]==Long.MAX_VALUE) oldT[0]=newT; periodUpdated[0]=false; }		if(periodUpdated[2]) { if(oldPeriod[2]==Long.MAX_VALUE) oldT[2]=newT; periodUpdated[2]=false; }	    }	    else if(newT-oldT[2]>period[2]) {		//System.out.println("Timer thread 2 is late by "+(newT-oldT[2]-period[2])+" millis");		oldT[2] = newT;		curEvent.type = GameShell.GATimerEvent;		curEvent.timerId = 2;		//System.out.println("::::::Sending timer 2 event");		oldPeriod[0]=period[0];		oldPeriod[1]=period[1];		if(!game.gameMain(curEvent)) notQuit = false;		if(periodUpdated[0]) { if(oldPeriod[0]==Long.MAX_VALUE) oldT[0]=newT; periodUpdated[0]=false; }		if(periodUpdated[1]) { if(oldPeriod[1]==Long.MAX_VALUE) oldT[1]=newT; periodUpdated[1]=false; }	    }	    }	}	}	catch( Exception ex ) { ex.printStackTrace(); }	//System.out.println("MAIN THREAD SENDING TERMINATE EVENT");	curEvent.type = GameShell.GATerminateEvent;	try{	game.gameMain(curEvent);	}	catch( Exception ex ) { ex.printStackTrace(); }	Display display = Display.getDisplay(midlet);	MenuReturner mr = new MenuReturner(midlet);	//System.out.println("MAIN THREAD SERIALLY INVOKING MENURETURNER");	display.callSerially(mr);    }}class MenuReturner implements Runnable {    MIDlet midlet;    public MenuReturner(MIDlet m) {	midlet = m;    }    public void run() {	if(midlet instanceof GameMIDlet)	    ((GameMIDlet)midlet).returnToMenu();    }}