/WebBBSC/src/webbbsc/NativeWorker.java

 1package webbbsc;
 2
 3/**
 4 * @author Victor
 5 * Interface to a native (written in c++, multithreaded) toolkit for calculating Black Jack base strategies 
 6 */
 7public class NativeWorker extends Thread{
 8//public:
 9	/**
10	 * @param acc: the object to receive strategy in serialized form on calculation finish
11	 */
12	public void attachStrategyAcceptor(IRawStrategyAcceptor acc){
13		acceptor = acc;
14	}
15
16	@Override
17	public void run(){
18		if(progress != null)
19			progress.setProgress(0f);
20		if(!prepareCalculation())
21			return;
22		
23		//buildNextPiece() is by far the most CPU time consuming here
24		while(!stopped && buildNextPiece()){
25			if(!stopped){
26				float currentProgress = getProgress();
27				if(currentProgress >= 1.0f && acceptor != null)
28					acceptor.acceptStrategy(getRawStrategy());
29				if(progress != null)
30					progress.setProgress(currentProgress);
31			}
32		}
33	}
34
35	public void setRules(Rules newRules){
36		rules = newRules;
37	}
38
39	public void inhibit(boolean stop){
40		stopped = stop;
41	}
42
43	public void terminate(){
44		inhibit(true);
45		while(isAlive()){
46			try{
47				join(1000);
48			}catch(InterruptedException e){
49			}
50			interrupt();
51		}
52		releaseCalculator();
53	}
54
55	/**
56	 * @param progr: interface for calling back progress changes
57	 */
58	public void attachProgress(IProgressable progr){
59		progress = progr;
60	}
61
62//private:
63	private native void createCalculator();
64	private native void releaseCalculator();
65
66	private Rules rules = new Rules();
67
68	private long calculatorHandle = 0;
69
70	private volatile boolean stopped = false;
71	private IProgressable progress;
72	private IRawStrategyAcceptor acceptor;
73
74	private native boolean buildNextPiece();
75	private native boolean prepareCalculation();
76
77	//progress value is between 0 and 1
78	private native float getProgress();
79
80	private native byte[] getRawStrategy();
81
82
83	static {
84		try {
85			System.loadLibrary("BJEngine");
86		} catch (UnsatisfiedLinkError e) {
87			System.err.println("Native code library failed to load: " + e);
88		}
89	}
90}