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} catch(Exception e) { myDungeon.errorMsg(e); } myDungeonCanvas.flushKeys(); myShouldStop = false; myShouldPause = false; // this is the main animation loop of the // game which advances the animation // and checks for keystrokes: while(true) { if(myShouldStop) { break; } myLastRefreshTime = System.currentTimeMillis(); myDungeonCanvas.checkKeys(); myDungeonCanvas.updateScreen(); // pause to make sure not more than 20 frames // per second are shown: synchronized(this) { try { wait(getWaitTime()); } catch(Exception e) {} } // don't advance while the game is paused: if(myShouldPause) { synchronized(this) { try { wait(); } catch(Exception e) {} } } } } } In this example, the main MIDlet class (Dungeon.java, see Listing 10-7) handles the initialization, game state changes, and error alerts. Looking in the startApp() method, you can see the timing on how the splash screen and game thread are started up, keeping in mind that the call that loads and initializes the custom data is the first call in the game thread s run method (see Listing 10-12 later in this chapter for the implementation of the DungeonManager.init method). So the resource-loading procedure isn t done by the AMS thread that calls startApp() (and which needs to return quickly); rather, it is the first action performed on the game thread once it is started. It s OK to do some resource loading from calls within the startApp() method (in this example, the simple logo is loaded before spawning a new thread), but extensive resource loading (as done by the Customizer and the DungeonManager s init() method) should be done on a new thread, as in this example, because some platforms will crash if the startApp() method takes too long before returning.

CHAPTER 8 JOHNNXT IS ALIVE!

11. You need to create several supporting private methods. These handle the actual access to the cache manager. Copy the code in Listing 11-11 and add it to the class definition.

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Looking at Listing 10-6, you might notice that the splash screen is set to null after being used so that its data can be garbage collected, but the Customizer is held in memory for the duration of the game. I could have written the game in such a way that the Customizer is no longer used after the initialization phase (and hence can be garbage collected), but I didn t bother because the Customizer really isn t holding all that much data. It might be useful to add a step that throws away the label images Hashtable after it is used (since the label images aren t reused once the label sprites are created; see Listing 10-8 in the next section). Listing 10-7. Dungeon.java package net.frog_parrot.dungeon; import javax.microedition.midlet.*; import javax.microedition.lcdui.*; import net.frog_parrot.util.*; /** * This is the main class of the dungeon game. * * @author Carol Hamer */ public class Dungeon extends MIDlet implements CommandListener { //----------------------------------------------------// game object fields /** * The canvas that the dungeon is drawn on. */ DungeonCanvas myCanvas; /** * the thread that advances the game clock. */ GameThread myGameThread; //----------------------------------------------------// initialization /** * Initialize the canvas. */ public Dungeon() { try { myCanvas = new DungeonCanvas(this); } catch(Exception e) { // if there's an error during creation,

Listing 11-11. Adding the GetSecurityCacheItem, GetCacheExpirations, and ConvertExpirationToSeconds Methods public SecurityCacheItem GetSecurityCacheItem(IToken token) { return GetSecurityCacheItem(token, false); } private SecurityCacheItem GetSecurityCacheItem( IToken token, bool createIfNull) { SecurityCacheItem item = null; item = securityCacheManager.GetData(token.Value) as SecurityCacheItem; if (item == null && createIfNull) { item = new SecurityCacheItem(); securityCacheManager.Add(token.Value, item, CacheItemPriority.Normal, null, GetCacheExpirations()); } return item; } private ICacheItemExpiration[] GetCacheExpirations() { ICacheItemExpiration[] cachingExpirations = new ICacheItemExpiration[2]; cachingExpirations[0] = new AbsoluteTime( new TimeSpan(0, 0, ConvertExpirationTimeToSeconds(absoluteExpiration))); cachingExpirations[1] = new SlidingTime( new TimeSpan(0, 0, ConvertExpirationTimeToSeconds(slidingExpiration))); return cachingExpirations; } private int ConvertExpirationTimeToSeconds( int expirationInMinutes) { return expirationInMinutes * 60; }

where sound is one of the constants in Table 8-3 and where the wait_completion can be true (the program waits until the sound has been completely executed) or false (the program starts the sound and continues at once). Table 8-3. Opcodes to Play JohnNXT Sounds

12. The code for the SaveSecurityCacheItem method and its overload differ from the other save methods in that they do not call the GetSecurityCacheItem method to save their data. The second version of the method actually calls the cache manager directly. Copy the code in Listing 11-12 into the class to implement this functionality.

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