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1 package tests.jfun.parsec;
2
3 import junit.framework.TestCase;
4
5
11 public class LoopBenchmark extends TestCase{
12 public class State{
13 private boolean ok;
14 State(){
15 this.ok = false;
16 }
17 void setOk(boolean ok){
18 this.ok = ok;
19 }
20 boolean isOk(){
21 return ok;
22 }
23 }
24 interface Factory{
25 Object  create(State state);
26 }
27 class FailedFactory implements Factory{
28 public Object create(State state){
29 state.setOk(false);
30 return null;
31 }
32 }
33 static final int times = 10000000;
34 public void test1(){
35 final Factory factory = new FailedFactory();
36 final State state = new State();
37 benchmarkFactory(factory, state);
38 benchmarkException(new ErrorFactory(), state);
39 benchmarkException(new ThrowingFactory(), state);
40 }
41
42 private void benchmarkFactory(Factory factory, State state){
43 final long startTime = System.currentTimeMillis();
44 for(int i=0; i<times; i++){
45 factory.create(state);
46 if(state.isOk())
47 break;
48 }
49 final long endTime = System.currentTimeMillis();
50 System.out.println(endTime-startTime);
51 }
52
53 private static final RuntimeException ex = new RuntimeException ();
54 class ErrorFactory implements Factory{
55 public Object create(State state){
56 throw ex;
57 }
58 }
59
60 class ThrowingFactory implements Factory{
61 public Object create(State state){
62 throw new RuntimeException ();
63 }
64 }
65 private void benchmarkException(Factory factory, State state){
66 final long startTime = System.currentTimeMillis();
67 for(int i=0; i<times; i++){
68 try{
69 factory.create(state);
70 }
71 catch(RuntimeException e){continue;}
72 break;
73 }
74 final long endTime = System.currentTimeMillis();
75 System.out.println(endTime-startTime);
76 }
77 }
78 |
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