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POHow to handle periodic updating of many objects?
 

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  1. POHow to handle periodic updating of many objects?
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    <p>I am working on a little Java game, leaning on the classic Asteroids.</p> <p>In this game there are a ton of objects which need to be updated in certain time intervals:</p> <p>Every frame: Objects that move or rotate.<br/> Every second: The game timer.<br/> Every few seconds: Enemy AI, enemy spawning<br/> Every some-second: Firing a new bullet from the ship weapon.</p> <p>Currently I'm handling it like this:</p> <pre><code>//This method is called by a timer that is run every 30 milliseconds //It will iterate through all objects that require periodic updates and call their //update method every 30ms. public void frameUpdateLoop(){ for( Updating u : allObjectsThatNeedPeriodicUpdates ){ u.update(); } } public class EnemySpawner implements Updating{ private static final int SPAWN_TRESHOLD=500; private int timeUntilNewEnemySpawns=SPAWN_TRESHOLD; //This method is called by frameUpdateLoop() //It is only supposed to do work once every 500ms, but is called every //30ms nonetheless. public void update(){ timeUntilNewEnemySpawns -= 30; //Subtract time since last update if( timeUntilNewEnemySpawns &lt;= 0){ SpawnNewEnemy(); timeUntilNewEnemySpawns = SPAWN_TRESHOLD; } } } </code></pre> <p>Of course this is only an example of how I am using it, so I removed the unnecessary parts.</p> <p>My question is: <em>Is that the right (=a good way) of implementing such an update system?</em> When reading around I noticed that most of the time a Timer is used for such a task.</p> <p>But that would require me to have dozens of timers running at once (one for each object that requires updating). <br/> If I understand correctly each instance of a Timer also creates a new thread, so I fear that this could become a problem at some point (thread-handling performance loss outweights my current system - or the number of threads becomes too large).</p> <p>I'm sort of new to Java so I don't know if my fears are baseless or if it really is a bad idea to have so many Timers.</p> <p>Thank you very much for suggestions, tips and corrections on this topic!</p>
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