| 11 |
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import java.util.concurrent.*; |
| 12 |
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import java.math.BigInteger; |
| 13 |
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|
| 14 |
< |
public class ExecutorsTest extends TestCase{ |
| 15 |
< |
|
| 14 |
> |
public class ExecutorsTest extends JSR166TestCase{ |
| 15 |
> |
|
| 16 |
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public static void main(String[] args) { |
| 17 |
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junit.textui.TestRunner.run (suite()); |
| 18 |
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} |
| 19 |
– |
|
| 20 |
– |
|
| 19 |
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public static Test suite() { |
| 20 |
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return new TestSuite(ExecutorsTest.class); |
| 21 |
|
} |
| 22 |
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|
| 23 |
< |
private static long SHORT_DELAY_MS = 100; |
| 24 |
< |
private static long MEDIUM_DELAY_MS = 1000; |
| 25 |
< |
private static long LONG_DELAY_MS = 10000; |
| 26 |
< |
|
| 27 |
< |
class SleepRun implements Runnable { |
| 28 |
< |
public void run() { |
| 29 |
< |
try{ |
| 30 |
< |
Thread.sleep(MEDIUM_DELAY_MS); |
| 31 |
< |
} catch(InterruptedException e){ |
| 32 |
< |
fail("unexpected exception"); |
| 33 |
< |
} |
| 23 |
> |
private static final String TEST_STRING = "a test string"; |
| 24 |
> |
|
| 25 |
> |
private static class MyTask implements Runnable { |
| 26 |
> |
public void run() { completed = true; } |
| 27 |
> |
public boolean isCompleted() { return completed; } |
| 28 |
> |
public void reset() { completed = false; } |
| 29 |
> |
private boolean completed = false; |
| 30 |
> |
} |
| 31 |
> |
|
| 32 |
> |
private static class StringTask implements Callable<String> { |
| 33 |
> |
public String call() { return TEST_STRING; } |
| 34 |
> |
} |
| 35 |
> |
|
| 36 |
> |
static class DirectExecutor implements Executor { |
| 37 |
> |
public void execute(Runnable r) { |
| 38 |
> |
r.run(); |
| 39 |
|
} |
| 40 |
|
} |
| 38 |
– |
|
| 41 |
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|
| 42 |
< |
class SleepCall implements Callable { |
| 43 |
< |
public Object call(){ |
| 44 |
< |
try{ |
| 45 |
< |
Thread.sleep(MEDIUM_DELAY_MS); |
| 46 |
< |
}catch(InterruptedException e){ |
| 47 |
< |
fail("unexpected exception"); |
| 42 |
> |
static class TimedCallable<T> implements Callable<T> { |
| 43 |
> |
private final Executor exec; |
| 44 |
> |
private final Callable<T> func; |
| 45 |
> |
private final long msecs; |
| 46 |
> |
|
| 47 |
> |
TimedCallable(Executor exec, Callable<T> func, long msecs) { |
| 48 |
> |
this.exec = exec; |
| 49 |
> |
this.func = func; |
| 50 |
> |
this.msecs = msecs; |
| 51 |
> |
} |
| 52 |
> |
|
| 53 |
> |
public T call() throws Exception { |
| 54 |
> |
Future<T> ftask = Executors.execute(exec, func); |
| 55 |
> |
try { |
| 56 |
> |
return ftask.get(msecs, TimeUnit.MILLISECONDS); |
| 57 |
> |
} finally { |
| 58 |
> |
ftask.cancel(true); |
| 59 |
|
} |
| 47 |
– |
return Boolean.TRUE; |
| 60 |
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} |
| 61 |
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} |
| 62 |
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|
| 63 |
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|
| 64 |
+ |
private static class Fib implements Callable<BigInteger> { |
| 65 |
+ |
private final BigInteger n; |
| 66 |
+ |
Fib(long n) { |
| 67 |
+ |
if (n < 0) throw new IllegalArgumentException("need non-negative arg, but got " + n); |
| 68 |
+ |
this.n = BigInteger.valueOf(n); |
| 69 |
+ |
} |
| 70 |
+ |
public BigInteger call() { |
| 71 |
+ |
BigInteger f1 = BigInteger.ONE; |
| 72 |
+ |
BigInteger f2 = f1; |
| 73 |
+ |
for (BigInteger i = BigInteger.ZERO; i.compareTo(n) < 0; i = i.add(BigInteger.ONE)) { |
| 74 |
+ |
BigInteger t = f1.add(f2); |
| 75 |
+ |
f1 = f2; |
| 76 |
+ |
f2 = t; |
| 77 |
+ |
} |
| 78 |
+ |
return f1; |
| 79 |
+ |
} |
| 80 |
+ |
}; |
| 81 |
+ |
|
| 82 |
+ |
|
| 83 |
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|
| 84 |
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/** |
| 85 |
< |
* Test to verify execute(Executor, Runnable) will throw |
| 85 |
> |
* execute(Executor, Runnable) will throw |
| 86 |
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* RejectedExecutionException Attempting to execute a runnable on |
| 87 |
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* a full ThreadPool will cause such an exception here, up to 5 |
| 88 |
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* runnables are attempted on a pool capable on handling one |
| 89 |
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* until it throws an exception |
| 90 |
|
*/ |
| 91 |
< |
public void testExecute1(){ |
| 92 |
< |
ThreadPoolExecutor p = new ThreadPoolExecutor(1,1,100L, TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(1)); |
| 93 |
< |
try{ |
| 91 |
> |
public void testExecute1() { |
| 92 |
> |
ThreadPoolExecutor p = new ThreadPoolExecutor(1,1, SHORT_DELAY_MS, TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(1)); |
| 93 |
> |
try { |
| 94 |
|
|
| 95 |
|
for(int i = 0; i < 5; ++i){ |
| 96 |
< |
Executors.execute(p, new SleepRun(), Boolean.TRUE); |
| 96 |
> |
Executors.execute(p, new MediumRunnable(), Boolean.TRUE); |
| 97 |
|
} |
| 98 |
< |
fail("should throw"); |
| 98 |
> |
shouldThrow(); |
| 99 |
|
} catch(RejectedExecutionException success){} |
| 100 |
< |
p.shutdownNow(); |
| 100 |
> |
joinPool(p); |
| 101 |
|
} |
| 102 |
|
|
| 103 |
|
/** |
| 104 |
< |
* Test to verify execute(Executor, Callable) will throw |
| 104 |
> |
* execute(Executor, Callable) will throw |
| 105 |
|
* RejectedExecutionException Attempting to execute a callable on |
| 106 |
|
* a full ThreadPool will cause such an exception here, up to 5 |
| 107 |
|
* runnables are attempted on a pool capable on handling one |
| 108 |
|
* until it throws an exception |
| 109 |
|
*/ |
| 110 |
< |
public void testExecute2(){ |
| 111 |
< |
ThreadPoolExecutor p = new ThreadPoolExecutor(1,1,100L, TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(1)); |
| 112 |
< |
try{ |
| 110 |
> |
public void testExecute2() { |
| 111 |
> |
ThreadPoolExecutor p = new ThreadPoolExecutor(1,1, SHORT_DELAY_MS, TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(1)); |
| 112 |
> |
try { |
| 113 |
|
for(int i = 0; i < 5; ++i) { |
| 114 |
< |
Executors.execute(p, new SleepCall()); |
| 114 |
> |
Executors.execute(p, new SmallCallable()); |
| 115 |
|
} |
| 116 |
< |
fail("should throw"); |
| 117 |
< |
}catch(RejectedExecutionException e){} |
| 118 |
< |
p.shutdownNow(); |
| 116 |
> |
shouldThrow(); |
| 117 |
> |
} catch(RejectedExecutionException e){} |
| 118 |
> |
joinPool(p); |
| 119 |
|
} |
| 120 |
|
|
| 121 |
|
|
| 122 |
|
/** |
| 123 |
< |
* Test to verify invoke(Executor, Runnable) throws InterruptedException |
| 123 |
> |
* invoke(Executor, Runnable) throws InterruptedException |
| 124 |
|
* A single use of invoke starts that will wait long enough |
| 125 |
|
* for the invoking thread to be interrupted |
| 126 |
|
*/ |
| 127 |
< |
public void testInvoke2(){ |
| 128 |
< |
final ThreadPoolExecutor p = new ThreadPoolExecutor(1,1,100L,TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(10)); |
| 127 |
> |
public void testInvoke2() { |
| 128 |
> |
final ThreadPoolExecutor p = new ThreadPoolExecutor(1,1,SHORT_DELAY_MS, TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(10)); |
| 129 |
|
Thread t = new Thread(new Runnable() { |
| 130 |
< |
public void run(){ |
| 131 |
< |
try{ |
| 132 |
< |
Executors.invoke(p,new Runnable(){ |
| 133 |
< |
public void run(){ |
| 134 |
< |
try{ |
| 130 |
> |
public void run() { |
| 131 |
> |
try { |
| 132 |
> |
Executors.invoke(p,new Runnable() { |
| 133 |
> |
public void run() { |
| 134 |
> |
try { |
| 135 |
|
Thread.sleep(MEDIUM_DELAY_MS); |
| 136 |
< |
fail("should throw"); |
| 137 |
< |
}catch(InterruptedException e){ |
| 136 |
> |
shouldThrow(); |
| 137 |
> |
} catch(InterruptedException e){ |
| 138 |
|
} |
| 139 |
|
} |
| 140 |
|
}); |
| 141 |
|
} catch(InterruptedException success){ |
| 142 |
|
} catch(Exception e) { |
| 143 |
< |
fail("unexpected exception"); |
| 143 |
> |
unexpectedException(); |
| 144 |
|
} |
| 145 |
|
|
| 146 |
|
} |
| 147 |
|
}); |
| 148 |
< |
try{ |
| 148 |
> |
try { |
| 149 |
|
t.start(); |
| 150 |
|
Thread.sleep(SHORT_DELAY_MS); |
| 151 |
|
t.interrupt(); |
| 152 |
< |
}catch(Exception e){ |
| 153 |
< |
fail("unexpected exception"); |
| 152 |
> |
} catch(Exception e){ |
| 153 |
> |
unexpectedException(); |
| 154 |
|
} |
| 155 |
< |
p.shutdownNow(); |
| 155 |
> |
joinPool(p); |
| 156 |
|
} |
| 157 |
|
|
| 158 |
|
/** |
| 159 |
< |
* Test to verify invoke(Executor, Runnable) will throw |
| 159 |
> |
* invoke(Executor, Runnable) will throw |
| 160 |
|
* ExecutionException An ExecutionException occurs when the |
| 161 |
|
* underlying Runnable throws an exception, here the |
| 162 |
|
* DivideByZeroException will cause an ExecutionException |
| 163 |
|
*/ |
| 164 |
< |
public void testInvoke3(){ |
| 165 |
< |
ThreadPoolExecutor p = new ThreadPoolExecutor(1,1,100L,TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(10)); |
| 166 |
< |
try{ |
| 167 |
< |
Runnable r = new Runnable(){ |
| 168 |
< |
public void run(){ |
| 164 |
> |
public void testInvoke3() { |
| 165 |
> |
ThreadPoolExecutor p = new ThreadPoolExecutor(1,1,SHORT_DELAY_MS, TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(10)); |
| 166 |
> |
try { |
| 167 |
> |
Runnable r = new Runnable() { |
| 168 |
> |
public void run() { |
| 169 |
|
int i = 5/0; |
| 170 |
|
} |
| 171 |
|
}; |
| 174 |
|
Executors.invoke(p,r); |
| 175 |
|
} |
| 176 |
|
|
| 177 |
< |
fail("should throw"); |
| 177 |
> |
shouldThrow(); |
| 178 |
|
} catch(ExecutionException success){ |
| 179 |
|
} catch(Exception e){ |
| 180 |
< |
fail("should throw EE"); |
| 180 |
> |
unexpectedException(); |
| 181 |
|
} |
| 182 |
< |
p.shutdownNow(); |
| 182 |
> |
joinPool(p); |
| 183 |
|
} |
| 184 |
|
|
| 185 |
|
|
| 186 |
|
|
| 187 |
|
/** |
| 188 |
< |
* Test to verify invoke(Executor, Callable) throws |
| 188 |
> |
* invoke(Executor, Callable) throws |
| 189 |
|
* InterruptedException A single use of invoke starts that will |
| 190 |
|
* wait long enough for the invoking thread to be interrupted |
| 191 |
|
*/ |
| 192 |
< |
public void testInvoke5(){ |
| 193 |
< |
final ThreadPoolExecutor p = new ThreadPoolExecutor(1,1,100L,TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(10)); |
| 192 |
> |
public void testInvoke5() { |
| 193 |
> |
final ThreadPoolExecutor p = new ThreadPoolExecutor(1,1,SHORT_DELAY_MS, TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(10)); |
| 194 |
|
|
| 195 |
< |
final Callable c = new Callable(){ |
| 196 |
< |
public Object call(){ |
| 197 |
< |
try{ |
| 198 |
< |
Executors.invoke(p, new SleepCall()); |
| 199 |
< |
fail("should throw"); |
| 200 |
< |
}catch(InterruptedException e){} |
| 195 |
> |
final Callable c = new Callable() { |
| 196 |
> |
public Object call() { |
| 197 |
> |
try { |
| 198 |
> |
Executors.invoke(p, new SmallCallable()); |
| 199 |
> |
shouldThrow(); |
| 200 |
> |
} catch(InterruptedException e){} |
| 201 |
|
catch(RejectedExecutionException e2){} |
| 202 |
|
catch(ExecutionException e3){} |
| 203 |
|
return Boolean.TRUE; |
| 206 |
|
|
| 207 |
|
|
| 208 |
|
|
| 209 |
< |
Thread t = new Thread(new Runnable(){ |
| 210 |
< |
public void run(){ |
| 211 |
< |
try{ |
| 209 |
> |
Thread t = new Thread(new Runnable() { |
| 210 |
> |
public void run() { |
| 211 |
> |
try { |
| 212 |
|
c.call(); |
| 213 |
< |
}catch(Exception e){} |
| 213 |
> |
} catch(Exception e){} |
| 214 |
|
} |
| 215 |
|
}); |
| 216 |
< |
try{ |
| 216 |
> |
try { |
| 217 |
|
t.start(); |
| 218 |
|
Thread.sleep(SHORT_DELAY_MS); |
| 219 |
|
t.interrupt(); |
| 220 |
|
t.join(); |
| 221 |
< |
}catch(InterruptedException e){ |
| 222 |
< |
fail("unexpected exception"); |
| 221 |
> |
} catch(InterruptedException e){ |
| 222 |
> |
unexpectedException(); |
| 223 |
|
} |
| 224 |
|
|
| 225 |
< |
p.shutdownNow(); |
| 225 |
> |
joinPool(p); |
| 226 |
|
} |
| 227 |
|
|
| 228 |
|
/** |
| 229 |
< |
* Test to verify invoke(Executor, Callable) will throw ExecutionException |
| 229 |
> |
* invoke(Executor, Callable) will throw ExecutionException |
| 230 |
|
* An ExecutionException occurs when the underlying Runnable throws |
| 231 |
|
* an exception, here the DivideByZeroException will cause an ExecutionException |
| 232 |
|
*/ |
| 233 |
< |
public void testInvoke6(){ |
| 234 |
< |
ThreadPoolExecutor p = new ThreadPoolExecutor(1,1,100L,TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(10)); |
| 233 |
> |
public void testInvoke6() { |
| 234 |
> |
ThreadPoolExecutor p = new ThreadPoolExecutor(1,1,SHORT_DELAY_MS, TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(10)); |
| 235 |
|
|
| 236 |
< |
try{ |
| 237 |
< |
Callable c = new Callable(){ |
| 238 |
< |
public Object call(){ |
| 236 |
> |
try { |
| 237 |
> |
Callable c = new Callable() { |
| 238 |
> |
public Object call() { |
| 239 |
|
int i = 5/0; |
| 240 |
|
return Boolean.TRUE; |
| 241 |
|
} |
| 245 |
|
Executors.invoke(p,c); |
| 246 |
|
} |
| 247 |
|
|
| 248 |
< |
fail("should throw"); |
| 249 |
< |
}catch(RejectedExecutionException e){} |
| 248 |
> |
shouldThrow(); |
| 249 |
> |
} catch(RejectedExecutionException e){} |
| 250 |
|
catch(InterruptedException e2){} |
| 251 |
|
catch(ExecutionException e3){} |
| 252 |
< |
p.shutdownNow(); |
| 252 |
> |
joinPool(p); |
| 253 |
|
} |
| 254 |
|
|
| 255 |
+ |
/** |
| 256 |
+ |
* |
| 257 |
+ |
*/ |
| 258 |
|
public void testExecuteRunnable () { |
| 259 |
|
try { |
| 260 |
|
Executor e = new DirectExecutor(); |
| 261 |
< |
Task task = new Task(); |
| 262 |
< |
|
| 229 |
< |
assertFalse("task should not be complete", task.isCompleted()); |
| 230 |
< |
|
| 261 |
> |
MyTask task = new MyTask(); |
| 262 |
> |
assertFalse(task.isCompleted()); |
| 263 |
|
Future<String> future = Executors.execute(e, task, TEST_STRING); |
| 264 |
|
String result = future.get(); |
| 265 |
< |
|
| 266 |
< |
assertTrue("task should be complete", task.isCompleted()); |
| 235 |
< |
assertSame("should return test string", TEST_STRING, result); |
| 265 |
> |
assertTrue(task.isCompleted()); |
| 266 |
> |
assertSame(TEST_STRING, result); |
| 267 |
|
} |
| 268 |
|
catch (ExecutionException ex) { |
| 269 |
< |
fail("Unexpected exception"); |
| 269 |
> |
unexpectedException(); |
| 270 |
|
} |
| 271 |
|
catch (InterruptedException ex) { |
| 272 |
< |
fail("Unexpected exception"); |
| 272 |
> |
unexpectedException(); |
| 273 |
|
} |
| 274 |
|
} |
| 275 |
|
|
| 276 |
+ |
/** |
| 277 |
+ |
* |
| 278 |
+ |
*/ |
| 279 |
|
public void testInvokeRunnable () { |
| 280 |
|
try { |
| 281 |
|
Executor e = new DirectExecutor(); |
| 282 |
< |
Task task = new Task(); |
| 283 |
< |
|
| 250 |
< |
assertFalse("task should not be complete", task.isCompleted()); |
| 251 |
< |
|
| 282 |
> |
MyTask task = new MyTask(); |
| 283 |
> |
assertFalse(task.isCompleted()); |
| 284 |
|
Executors.invoke(e, task); |
| 285 |
< |
|
| 254 |
< |
assertTrue("task should be complete", task.isCompleted()); |
| 285 |
> |
assertTrue(task.isCompleted()); |
| 286 |
|
} |
| 287 |
|
catch (ExecutionException ex) { |
| 288 |
< |
fail("Unexpected exception"); |
| 288 |
> |
unexpectedException(); |
| 289 |
|
} |
| 290 |
|
catch (InterruptedException ex) { |
| 291 |
< |
fail("Unexpected exception"); |
| 291 |
> |
unexpectedException(); |
| 292 |
|
} |
| 293 |
|
} |
| 294 |
|
|
| 295 |
+ |
/** |
| 296 |
+ |
* |
| 297 |
+ |
*/ |
| 298 |
|
public void testExecuteCallable () { |
| 299 |
|
try { |
| 300 |
|
Executor e = new DirectExecutor(); |
| 301 |
|
Future<String> future = Executors.execute(e, new StringTask()); |
| 302 |
|
String result = future.get(); |
| 303 |
< |
|
| 270 |
< |
assertSame("should return test string", TEST_STRING, result); |
| 303 |
> |
assertSame(TEST_STRING, result); |
| 304 |
|
} |
| 305 |
|
catch (ExecutionException ex) { |
| 306 |
< |
fail("Unexpected exception"); |
| 306 |
> |
unexpectedException(); |
| 307 |
|
} |
| 308 |
|
catch (InterruptedException ex) { |
| 309 |
< |
fail("Unexpected exception"); |
| 309 |
> |
unexpectedException(); |
| 310 |
|
} |
| 311 |
|
} |
| 312 |
|
|
| 313 |
+ |
/** |
| 314 |
+ |
* |
| 315 |
+ |
*/ |
| 316 |
|
public void testInvokeCallable () { |
| 317 |
|
try { |
| 318 |
|
Executor e = new DirectExecutor(); |
| 319 |
|
String result = Executors.invoke(e, new StringTask()); |
| 320 |
|
|
| 321 |
< |
assertSame("should return test string", TEST_STRING, result); |
| 321 |
> |
assertSame(TEST_STRING, result); |
| 322 |
|
} |
| 323 |
|
catch (ExecutionException ex) { |
| 324 |
< |
fail("Unexpected exception" ); |
| 324 |
> |
unexpectedException(); |
| 325 |
|
} |
| 326 |
|
catch (InterruptedException ex) { |
| 327 |
< |
fail("Unexpected exception"); |
| 292 |
< |
} |
| 293 |
< |
} |
| 294 |
< |
|
| 295 |
< |
private static final String TEST_STRING = "a test string"; |
| 296 |
< |
|
| 297 |
< |
private static class Task implements Runnable { |
| 298 |
< |
public void run() { completed = true; } |
| 299 |
< |
public boolean isCompleted() { return completed; } |
| 300 |
< |
public void reset() { completed = false; } |
| 301 |
< |
private boolean completed = false; |
| 302 |
< |
} |
| 303 |
< |
|
| 304 |
< |
private static class StringTask implements Callable<String> { |
| 305 |
< |
public String call() { return TEST_STRING; } |
| 306 |
< |
} |
| 307 |
< |
|
| 308 |
< |
static class DirectExecutor implements Executor { |
| 309 |
< |
public void execute(Runnable r) { |
| 310 |
< |
r.run(); |
| 327 |
> |
unexpectedException(); |
| 328 |
|
} |
| 329 |
|
} |
| 330 |
|
|
| 331 |
|
/** |
| 332 |
< |
* Check that timeouts from execute will time out if they compute |
| 316 |
< |
* too long. |
| 332 |
> |
* timeouts from execute will time out if they compute too long. |
| 333 |
|
*/ |
| 318 |
– |
|
| 334 |
|
public void testTimedCallable() { |
| 335 |
|
int N = 10000; |
| 336 |
|
ExecutorService executor = Executors.newSingleThreadExecutor(); |
| 356 |
|
return; |
| 357 |
|
} |
| 358 |
|
catch (Exception e) { |
| 359 |
< |
fail("unexpected exception: " + e); |
| 359 |
> |
unexpectedException(); |
| 360 |
|
} |
| 361 |
|
} |
| 362 |
|
// if by chance we didn't ever time out, total time must be small |
| 364 |
|
assertTrue(elapsed < N); |
| 365 |
|
} |
| 366 |
|
finally { |
| 367 |
< |
executor.shutdownNow(); |
| 367 |
> |
joinPool(executor); |
| 368 |
|
} |
| 369 |
|
} |
| 370 |
|
|
| 371 |
|
|
| 357 |
– |
static class TimedCallable<T> implements Callable<T> { |
| 358 |
– |
private final Executor exec; |
| 359 |
– |
private final Callable<T> func; |
| 360 |
– |
private final long msecs; |
| 361 |
– |
|
| 362 |
– |
TimedCallable(Executor exec, Callable<T> func, long msecs) { |
| 363 |
– |
this.exec = exec; |
| 364 |
– |
this.func = func; |
| 365 |
– |
this.msecs = msecs; |
| 366 |
– |
} |
| 367 |
– |
|
| 368 |
– |
public T call() throws Exception { |
| 369 |
– |
Future<T> ftask = Executors.execute(exec, func); |
| 370 |
– |
try { |
| 371 |
– |
return ftask.get(msecs, TimeUnit.MILLISECONDS); |
| 372 |
– |
} finally { |
| 373 |
– |
ftask.cancel(true); |
| 374 |
– |
} |
| 375 |
– |
} |
| 376 |
– |
} |
| 377 |
– |
|
| 378 |
– |
|
| 379 |
– |
private static class Fib implements Callable<BigInteger> { |
| 380 |
– |
private final BigInteger n; |
| 381 |
– |
Fib(long n) { |
| 382 |
– |
if (n < 0) throw new IllegalArgumentException("need non-negative arg, but got " + n); |
| 383 |
– |
this.n = BigInteger.valueOf(n); |
| 384 |
– |
} |
| 385 |
– |
public BigInteger call() { |
| 386 |
– |
BigInteger f1 = BigInteger.ONE; |
| 387 |
– |
BigInteger f2 = f1; |
| 388 |
– |
for (BigInteger i = BigInteger.ZERO; i.compareTo(n) < 0; i = i.add(BigInteger.ONE)) { |
| 389 |
– |
BigInteger t = f1.add(f2); |
| 390 |
– |
f1 = f2; |
| 391 |
– |
f2 = t; |
| 392 |
– |
} |
| 393 |
– |
return f1; |
| 394 |
– |
} |
| 395 |
– |
}; |
| 396 |
– |
|
| 372 |
|
|
| 373 |
|
|
| 374 |
|
} |
