Jake Slack | 03928ae | 2014-05-13 18:41:56 -0700 | [diff] [blame] | 1 | // |
| 2 | // ======================================================================== |
| 3 | // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd. |
| 4 | // ------------------------------------------------------------------------ |
| 5 | // All rights reserved. This program and the accompanying materials |
| 6 | // are made available under the terms of the Eclipse Public License v1.0 |
| 7 | // and Apache License v2.0 which accompanies this distribution. |
| 8 | // |
| 9 | // The Eclipse Public License is available at |
| 10 | // http://www.eclipse.org/legal/epl-v10.html |
| 11 | // |
| 12 | // The Apache License v2.0 is available at |
| 13 | // http://www.opensource.org/licenses/apache2.0.php |
| 14 | // |
| 15 | // You may elect to redistribute this code under either of these licenses. |
| 16 | // ======================================================================== |
| 17 | // |
| 18 | |
| 19 | |
| 20 | package org.eclipse.jetty.util.thread; |
| 21 | |
| 22 | import java.io.IOException; |
| 23 | import java.util.ArrayList; |
| 24 | import java.util.Arrays; |
| 25 | import java.util.List; |
| 26 | import java.util.concurrent.ArrayBlockingQueue; |
| 27 | import java.util.concurrent.BlockingQueue; |
| 28 | import java.util.concurrent.ConcurrentLinkedQueue; |
| 29 | import java.util.concurrent.Executor; |
| 30 | import java.util.concurrent.RejectedExecutionException; |
| 31 | import java.util.concurrent.TimeUnit; |
| 32 | import java.util.concurrent.atomic.AtomicInteger; |
| 33 | import java.util.concurrent.atomic.AtomicLong; |
| 34 | |
| 35 | import org.eclipse.jetty.util.BlockingArrayQueue; |
| 36 | import org.eclipse.jetty.util.component.AbstractLifeCycle; |
| 37 | import org.eclipse.jetty.util.component.AggregateLifeCycle; |
| 38 | import org.eclipse.jetty.util.component.Dumpable; |
| 39 | import org.eclipse.jetty.util.component.LifeCycle; |
| 40 | import org.eclipse.jetty.util.log.Log; |
| 41 | import org.eclipse.jetty.util.log.Logger; |
| 42 | import org.eclipse.jetty.util.thread.ThreadPool.SizedThreadPool; |
| 43 | |
| 44 | public class QueuedThreadPool extends AbstractLifeCycle implements SizedThreadPool, Executor, Dumpable |
| 45 | { |
| 46 | private static final Logger LOG = Log.getLogger(QueuedThreadPool.class); |
| 47 | |
| 48 | private final AtomicInteger _threadsStarted = new AtomicInteger(); |
| 49 | private final AtomicInteger _threadsIdle = new AtomicInteger(); |
| 50 | private final AtomicLong _lastShrink = new AtomicLong(); |
| 51 | private final ConcurrentLinkedQueue<Thread> _threads=new ConcurrentLinkedQueue<Thread>(); |
| 52 | private final Object _joinLock = new Object(); |
| 53 | private BlockingQueue<Runnable> _jobs; |
| 54 | private String _name; |
| 55 | private int _maxIdleTimeMs=60000; |
| 56 | private int _maxThreads=254; |
| 57 | private int _minThreads=8; |
| 58 | private int _maxQueued=-1; |
| 59 | private int _priority=Thread.NORM_PRIORITY; |
| 60 | private boolean _daemon=false; |
| 61 | private int _maxStopTime=100; |
| 62 | private boolean _detailedDump=false; |
| 63 | |
| 64 | /* ------------------------------------------------------------------- */ |
| 65 | /** Construct |
| 66 | */ |
| 67 | public QueuedThreadPool() |
| 68 | { |
| 69 | _name="qtp"+super.hashCode(); |
| 70 | } |
| 71 | |
| 72 | /* ------------------------------------------------------------------- */ |
| 73 | /** Construct |
| 74 | */ |
| 75 | public QueuedThreadPool(int maxThreads) |
| 76 | { |
| 77 | this(); |
| 78 | setMaxThreads(maxThreads); |
| 79 | } |
| 80 | |
| 81 | /* ------------------------------------------------------------------- */ |
| 82 | /** Construct |
| 83 | */ |
| 84 | public QueuedThreadPool(BlockingQueue<Runnable> jobQ) |
| 85 | { |
| 86 | this(); |
| 87 | _jobs=jobQ; |
| 88 | _jobs.clear(); |
| 89 | } |
| 90 | |
| 91 | |
| 92 | /* ------------------------------------------------------------ */ |
| 93 | @Override |
| 94 | protected void doStart() throws Exception |
| 95 | { |
| 96 | super.doStart(); |
| 97 | _threadsStarted.set(0); |
| 98 | |
| 99 | if (_jobs==null) |
| 100 | { |
| 101 | _jobs=_maxQueued>0 ?new ArrayBlockingQueue<Runnable>(_maxQueued) |
| 102 | :new BlockingArrayQueue<Runnable>(_minThreads,_minThreads); |
| 103 | } |
| 104 | |
| 105 | int threads=_threadsStarted.get(); |
| 106 | while (isRunning() && threads<_minThreads) |
| 107 | { |
| 108 | startThread(threads); |
| 109 | threads=_threadsStarted.get(); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | /* ------------------------------------------------------------ */ |
| 114 | @Override |
| 115 | protected void doStop() throws Exception |
| 116 | { |
| 117 | super.doStop(); |
| 118 | long start=System.currentTimeMillis(); |
| 119 | |
| 120 | // let jobs complete naturally for a while |
| 121 | while (_threadsStarted.get()>0 && (System.currentTimeMillis()-start) < (_maxStopTime/2)) |
| 122 | Thread.sleep(1); |
| 123 | |
| 124 | // kill queued jobs and flush out idle jobs |
| 125 | _jobs.clear(); |
| 126 | Runnable noop = new Runnable(){public void run(){}}; |
| 127 | for (int i=_threadsIdle.get();i-->0;) |
| 128 | _jobs.offer(noop); |
| 129 | Thread.yield(); |
| 130 | |
| 131 | // interrupt remaining threads |
| 132 | if (_threadsStarted.get()>0) |
| 133 | for (Thread thread : _threads) |
| 134 | thread.interrupt(); |
| 135 | |
| 136 | // wait for remaining threads to die |
| 137 | while (_threadsStarted.get()>0 && (System.currentTimeMillis()-start) < _maxStopTime) |
| 138 | { |
| 139 | Thread.sleep(1); |
| 140 | } |
| 141 | Thread.yield(); |
| 142 | int size=_threads.size(); |
| 143 | if (size>0) |
| 144 | { |
| 145 | LOG.warn(size+" threads could not be stopped"); |
| 146 | |
| 147 | if (size==1 || LOG.isDebugEnabled()) |
| 148 | { |
| 149 | for (Thread unstopped : _threads) |
| 150 | { |
| 151 | LOG.info("Couldn't stop "+unstopped); |
| 152 | for (StackTraceElement element : unstopped.getStackTrace()) |
| 153 | { |
| 154 | LOG.info(" at "+element); |
| 155 | } |
| 156 | } |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | synchronized (_joinLock) |
| 161 | { |
| 162 | _joinLock.notifyAll(); |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | /* ------------------------------------------------------------ */ |
| 167 | /** |
| 168 | * Delegated to the named or anonymous Pool. |
| 169 | */ |
| 170 | public void setDaemon(boolean daemon) |
| 171 | { |
| 172 | _daemon=daemon; |
| 173 | } |
| 174 | |
| 175 | /* ------------------------------------------------------------ */ |
| 176 | /** Set the maximum thread idle time. |
| 177 | * Threads that are idle for longer than this period may be |
| 178 | * stopped. |
| 179 | * Delegated to the named or anonymous Pool. |
| 180 | * @see #getMaxIdleTimeMs |
| 181 | * @param maxIdleTimeMs Max idle time in ms. |
| 182 | */ |
| 183 | public void setMaxIdleTimeMs(int maxIdleTimeMs) |
| 184 | { |
| 185 | _maxIdleTimeMs=maxIdleTimeMs; |
| 186 | } |
| 187 | |
| 188 | /* ------------------------------------------------------------ */ |
| 189 | /** |
| 190 | * @param stopTimeMs maximum total time that stop() will wait for threads to die. |
| 191 | */ |
| 192 | public void setMaxStopTimeMs(int stopTimeMs) |
| 193 | { |
| 194 | _maxStopTime = stopTimeMs; |
| 195 | } |
| 196 | |
| 197 | /* ------------------------------------------------------------ */ |
| 198 | /** Set the maximum number of threads. |
| 199 | * Delegated to the named or anonymous Pool. |
| 200 | * @see #getMaxThreads |
| 201 | * @param maxThreads maximum number of threads. |
| 202 | */ |
| 203 | public void setMaxThreads(int maxThreads) |
| 204 | { |
| 205 | _maxThreads=maxThreads; |
| 206 | if (_minThreads>_maxThreads) |
| 207 | _minThreads=_maxThreads; |
| 208 | } |
| 209 | |
| 210 | /* ------------------------------------------------------------ */ |
| 211 | /** Set the minimum number of threads. |
| 212 | * Delegated to the named or anonymous Pool. |
| 213 | * @see #getMinThreads |
| 214 | * @param minThreads minimum number of threads |
| 215 | */ |
| 216 | public void setMinThreads(int minThreads) |
| 217 | { |
| 218 | _minThreads=minThreads; |
| 219 | |
| 220 | if (_minThreads>_maxThreads) |
| 221 | _maxThreads=_minThreads; |
| 222 | |
| 223 | int threads=_threadsStarted.get(); |
| 224 | while (isStarted() && threads<_minThreads) |
| 225 | { |
| 226 | startThread(threads); |
| 227 | threads=_threadsStarted.get(); |
| 228 | } |
| 229 | } |
| 230 | |
| 231 | /* ------------------------------------------------------------ */ |
| 232 | /** |
| 233 | * @param name Name of the BoundedThreadPool to use when naming Threads. |
| 234 | */ |
| 235 | public void setName(String name) |
| 236 | { |
| 237 | if (isRunning()) |
| 238 | throw new IllegalStateException("started"); |
| 239 | _name= name; |
| 240 | } |
| 241 | |
| 242 | /* ------------------------------------------------------------ */ |
| 243 | /** Set the priority of the pool threads. |
| 244 | * @param priority the new thread priority. |
| 245 | */ |
| 246 | public void setThreadsPriority(int priority) |
| 247 | { |
| 248 | _priority=priority; |
| 249 | } |
| 250 | |
| 251 | /* ------------------------------------------------------------ */ |
| 252 | /** |
| 253 | * @return maximum queue size |
| 254 | */ |
| 255 | public int getMaxQueued() |
| 256 | { |
| 257 | return _maxQueued; |
| 258 | } |
| 259 | |
| 260 | /* ------------------------------------------------------------ */ |
| 261 | /** |
| 262 | * @param max job queue size |
| 263 | */ |
| 264 | public void setMaxQueued(int max) |
| 265 | { |
| 266 | if (isRunning()) |
| 267 | throw new IllegalStateException("started"); |
| 268 | _maxQueued=max; |
| 269 | } |
| 270 | |
| 271 | /* ------------------------------------------------------------ */ |
| 272 | /** Get the maximum thread idle time. |
| 273 | * Delegated to the named or anonymous Pool. |
| 274 | * @see #setMaxIdleTimeMs |
| 275 | * @return Max idle time in ms. |
| 276 | */ |
| 277 | public int getMaxIdleTimeMs() |
| 278 | { |
| 279 | return _maxIdleTimeMs; |
| 280 | } |
| 281 | |
| 282 | /* ------------------------------------------------------------ */ |
| 283 | /** |
| 284 | * @return maximum total time that stop() will wait for threads to die. |
| 285 | */ |
| 286 | public int getMaxStopTimeMs() |
| 287 | { |
| 288 | return _maxStopTime; |
| 289 | } |
| 290 | |
| 291 | /* ------------------------------------------------------------ */ |
| 292 | /** Set the maximum number of threads. |
| 293 | * Delegated to the named or anonymous Pool. |
| 294 | * @see #setMaxThreads |
| 295 | * @return maximum number of threads. |
| 296 | */ |
| 297 | public int getMaxThreads() |
| 298 | { |
| 299 | return _maxThreads; |
| 300 | } |
| 301 | |
| 302 | /* ------------------------------------------------------------ */ |
| 303 | /** Get the minimum number of threads. |
| 304 | * Delegated to the named or anonymous Pool. |
| 305 | * @see #setMinThreads |
| 306 | * @return minimum number of threads. |
| 307 | */ |
| 308 | public int getMinThreads() |
| 309 | { |
| 310 | return _minThreads; |
| 311 | } |
| 312 | |
| 313 | /* ------------------------------------------------------------ */ |
| 314 | /** |
| 315 | * @return The name of the BoundedThreadPool. |
| 316 | */ |
| 317 | public String getName() |
| 318 | { |
| 319 | return _name; |
| 320 | } |
| 321 | |
| 322 | /* ------------------------------------------------------------ */ |
| 323 | /** Get the priority of the pool threads. |
| 324 | * @return the priority of the pool threads. |
| 325 | */ |
| 326 | public int getThreadsPriority() |
| 327 | { |
| 328 | return _priority; |
| 329 | } |
| 330 | |
| 331 | /* ------------------------------------------------------------ */ |
| 332 | /** |
| 333 | * Delegated to the named or anonymous Pool. |
| 334 | */ |
| 335 | public boolean isDaemon() |
| 336 | { |
| 337 | return _daemon; |
| 338 | } |
| 339 | |
| 340 | /* ------------------------------------------------------------ */ |
| 341 | public boolean isDetailedDump() |
| 342 | { |
| 343 | return _detailedDump; |
| 344 | } |
| 345 | |
| 346 | /* ------------------------------------------------------------ */ |
| 347 | public void setDetailedDump(boolean detailedDump) |
| 348 | { |
| 349 | _detailedDump = detailedDump; |
| 350 | } |
| 351 | |
| 352 | /* ------------------------------------------------------------ */ |
| 353 | public boolean dispatch(Runnable job) |
| 354 | { |
| 355 | if (isRunning()) |
| 356 | { |
| 357 | final int jobQ = _jobs.size(); |
| 358 | final int idle = getIdleThreads(); |
| 359 | if(_jobs.offer(job)) |
| 360 | { |
| 361 | // If we had no idle threads or the jobQ is greater than the idle threads |
| 362 | if (idle==0 || jobQ>idle) |
| 363 | { |
| 364 | int threads=_threadsStarted.get(); |
| 365 | if (threads<_maxThreads) |
| 366 | startThread(threads); |
| 367 | } |
| 368 | return true; |
| 369 | } |
| 370 | } |
| 371 | LOG.debug("Dispatched {} to stopped {}",job,this); |
| 372 | return false; |
| 373 | } |
| 374 | |
| 375 | /* ------------------------------------------------------------ */ |
| 376 | public void execute(Runnable job) |
| 377 | { |
| 378 | if (!dispatch(job)) |
| 379 | throw new RejectedExecutionException(); |
| 380 | } |
| 381 | |
| 382 | /* ------------------------------------------------------------ */ |
| 383 | /** |
| 384 | * Blocks until the thread pool is {@link LifeCycle#stop stopped}. |
| 385 | */ |
| 386 | public void join() throws InterruptedException |
| 387 | { |
| 388 | synchronized (_joinLock) |
| 389 | { |
| 390 | while (isRunning()) |
| 391 | _joinLock.wait(); |
| 392 | } |
| 393 | |
| 394 | while (isStopping()) |
| 395 | Thread.sleep(1); |
| 396 | } |
| 397 | |
| 398 | /* ------------------------------------------------------------ */ |
| 399 | /** |
| 400 | * @return The total number of threads currently in the pool |
| 401 | */ |
| 402 | public int getThreads() |
| 403 | { |
| 404 | return _threadsStarted.get(); |
| 405 | } |
| 406 | |
| 407 | /* ------------------------------------------------------------ */ |
| 408 | /** |
| 409 | * @return The number of idle threads in the pool |
| 410 | */ |
| 411 | public int getIdleThreads() |
| 412 | { |
| 413 | return _threadsIdle.get(); |
| 414 | } |
| 415 | |
| 416 | /* ------------------------------------------------------------ */ |
| 417 | /** |
| 418 | * @return True if the pool is at maxThreads and there are not more idle threads than queued jobs |
| 419 | */ |
| 420 | public boolean isLowOnThreads() |
| 421 | { |
| 422 | return _threadsStarted.get()==_maxThreads && _jobs.size()>=_threadsIdle.get(); |
| 423 | } |
| 424 | |
| 425 | /* ------------------------------------------------------------ */ |
| 426 | private boolean startThread(int threads) |
| 427 | { |
| 428 | final int next=threads+1; |
| 429 | if (!_threadsStarted.compareAndSet(threads,next)) |
| 430 | return false; |
| 431 | |
| 432 | boolean started=false; |
| 433 | try |
| 434 | { |
| 435 | Thread thread=newThread(_runnable); |
| 436 | thread.setDaemon(_daemon); |
| 437 | thread.setPriority(_priority); |
| 438 | thread.setName(_name+"-"+thread.getId()); |
| 439 | _threads.add(thread); |
| 440 | |
| 441 | thread.start(); |
| 442 | started=true; |
| 443 | } |
| 444 | finally |
| 445 | { |
| 446 | if (!started) |
| 447 | _threadsStarted.decrementAndGet(); |
| 448 | } |
| 449 | return started; |
| 450 | } |
| 451 | |
| 452 | /* ------------------------------------------------------------ */ |
| 453 | protected Thread newThread(Runnable runnable) |
| 454 | { |
| 455 | return new Thread(runnable); |
| 456 | } |
| 457 | |
| 458 | |
| 459 | /* ------------------------------------------------------------ */ |
| 460 | public String dump() |
| 461 | { |
| 462 | return AggregateLifeCycle.dump(this); |
| 463 | } |
| 464 | |
| 465 | /* ------------------------------------------------------------ */ |
| 466 | public void dump(Appendable out, String indent) throws IOException |
| 467 | { |
| 468 | List<Object> dump = new ArrayList<Object>(getMaxThreads()); |
| 469 | for (final Thread thread: _threads) |
| 470 | { |
| 471 | final StackTraceElement[] trace=thread.getStackTrace(); |
| 472 | boolean inIdleJobPoll=false; |
| 473 | // trace can be null on early java 6 jvms |
| 474 | if (trace != null) |
| 475 | { |
| 476 | for (StackTraceElement t : trace) |
| 477 | { |
| 478 | if ("idleJobPoll".equals(t.getMethodName())) |
| 479 | { |
| 480 | inIdleJobPoll = true; |
| 481 | break; |
| 482 | } |
| 483 | } |
| 484 | } |
| 485 | final boolean idle=inIdleJobPoll; |
| 486 | |
| 487 | if (_detailedDump) |
| 488 | { |
| 489 | dump.add(new Dumpable() |
| 490 | { |
| 491 | public void dump(Appendable out, String indent) throws IOException |
| 492 | { |
| 493 | out.append(String.valueOf(thread.getId())).append(' ').append(thread.getName()).append(' ').append(thread.getState().toString()).append(idle?" IDLE":"").append('\n'); |
| 494 | if (!idle) |
| 495 | AggregateLifeCycle.dump(out,indent,Arrays.asList(trace)); |
| 496 | } |
| 497 | |
| 498 | public String dump() |
| 499 | { |
| 500 | return null; |
| 501 | } |
| 502 | }); |
| 503 | } |
| 504 | else |
| 505 | { |
| 506 | dump.add(thread.getId()+" "+thread.getName()+" "+thread.getState()+" @ "+(trace.length>0?trace[0]:"???")+(idle?" IDLE":"")); |
| 507 | } |
| 508 | } |
| 509 | |
| 510 | AggregateLifeCycle.dumpObject(out,this); |
| 511 | AggregateLifeCycle.dump(out,indent,dump); |
| 512 | |
| 513 | } |
| 514 | |
| 515 | |
| 516 | /* ------------------------------------------------------------ */ |
| 517 | @Override |
| 518 | public String toString() |
| 519 | { |
| 520 | return _name+"{"+getMinThreads()+"<="+getIdleThreads()+"<="+getThreads()+"/"+getMaxThreads()+","+(_jobs==null?-1:_jobs.size())+"}"; |
| 521 | } |
| 522 | |
| 523 | /* ------------------------------------------------------------ */ |
| 524 | private Runnable idleJobPoll() throws InterruptedException |
| 525 | { |
| 526 | return _jobs.poll(_maxIdleTimeMs,TimeUnit.MILLISECONDS); |
| 527 | } |
| 528 | |
| 529 | /* ------------------------------------------------------------ */ |
| 530 | private Runnable _runnable = new Runnable() |
| 531 | { |
| 532 | public void run() |
| 533 | { |
| 534 | boolean shrink=false; |
| 535 | try |
| 536 | { |
| 537 | Runnable job=_jobs.poll(); |
| 538 | while (isRunning()) |
| 539 | { |
| 540 | // Job loop |
| 541 | while (job!=null && isRunning()) |
| 542 | { |
| 543 | runJob(job); |
| 544 | job=_jobs.poll(); |
| 545 | } |
| 546 | |
| 547 | // Idle loop |
| 548 | try |
| 549 | { |
| 550 | _threadsIdle.incrementAndGet(); |
| 551 | |
| 552 | while (isRunning() && job==null) |
| 553 | { |
| 554 | if (_maxIdleTimeMs<=0) |
| 555 | job=_jobs.take(); |
| 556 | else |
| 557 | { |
| 558 | // maybe we should shrink? |
| 559 | final int size=_threadsStarted.get(); |
| 560 | if (size>_minThreads) |
| 561 | { |
| 562 | long last=_lastShrink.get(); |
| 563 | long now=System.currentTimeMillis(); |
| 564 | if (last==0 || (now-last)>_maxIdleTimeMs) |
| 565 | { |
| 566 | shrink=_lastShrink.compareAndSet(last,now) && |
| 567 | _threadsStarted.compareAndSet(size,size-1); |
| 568 | if (shrink) |
| 569 | return; |
| 570 | } |
| 571 | } |
| 572 | job=idleJobPoll(); |
| 573 | } |
| 574 | } |
| 575 | } |
| 576 | finally |
| 577 | { |
| 578 | _threadsIdle.decrementAndGet(); |
| 579 | } |
| 580 | } |
| 581 | } |
| 582 | catch(InterruptedException e) |
| 583 | { |
| 584 | LOG.ignore(e); |
| 585 | } |
| 586 | catch(Exception e) |
| 587 | { |
| 588 | LOG.warn(e); |
| 589 | } |
| 590 | finally |
| 591 | { |
| 592 | if (!shrink) |
| 593 | _threadsStarted.decrementAndGet(); |
| 594 | _threads.remove(Thread.currentThread()); |
| 595 | } |
| 596 | } |
| 597 | }; |
| 598 | |
| 599 | /* ------------------------------------------------------------ */ |
| 600 | /** |
| 601 | * <p>Runs the given job in the {@link Thread#currentThread() current thread}.</p> |
| 602 | * <p>Subclasses may override to perform pre/post actions before/after the job is run.</p> |
| 603 | * |
| 604 | * @param job the job to run |
| 605 | */ |
| 606 | protected void runJob(Runnable job) |
| 607 | { |
| 608 | job.run(); |
| 609 | } |
| 610 | |
| 611 | /* ------------------------------------------------------------ */ |
| 612 | /** |
| 613 | * @return the job queue |
| 614 | */ |
| 615 | protected BlockingQueue<Runnable> getQueue() |
| 616 | { |
| 617 | return _jobs; |
| 618 | } |
| 619 | |
| 620 | /* ------------------------------------------------------------ */ |
| 621 | /** |
| 622 | * @param id The thread ID to stop. |
| 623 | * @return true if the thread was found and stopped. |
| 624 | * @deprecated Use {@link #interruptThread(long)} in preference |
| 625 | */ |
| 626 | @Deprecated |
| 627 | public boolean stopThread(long id) |
| 628 | { |
| 629 | for (Thread thread: _threads) |
| 630 | { |
| 631 | if (thread.getId()==id) |
| 632 | { |
| 633 | thread.stop(); |
| 634 | return true; |
| 635 | } |
| 636 | } |
| 637 | return false; |
| 638 | } |
| 639 | |
| 640 | /* ------------------------------------------------------------ */ |
| 641 | /** |
| 642 | * @param id The thread ID to interrupt. |
| 643 | * @return true if the thread was found and interrupted. |
| 644 | */ |
| 645 | public boolean interruptThread(long id) |
| 646 | { |
| 647 | for (Thread thread: _threads) |
| 648 | { |
| 649 | if (thread.getId()==id) |
| 650 | { |
| 651 | thread.interrupt(); |
| 652 | return true; |
| 653 | } |
| 654 | } |
| 655 | return false; |
| 656 | } |
| 657 | |
| 658 | /* ------------------------------------------------------------ */ |
| 659 | /** |
| 660 | * @param id The thread ID to interrupt. |
| 661 | * @return true if the thread was found and interrupted. |
| 662 | */ |
| 663 | public String dumpThread(long id) |
| 664 | { |
| 665 | for (Thread thread: _threads) |
| 666 | { |
| 667 | if (thread.getId()==id) |
| 668 | { |
| 669 | StringBuilder buf = new StringBuilder(); |
| 670 | buf.append(thread.getId()).append(" ").append(thread.getName()).append(" ").append(thread.getState()).append(":\n"); |
| 671 | for (StackTraceElement element : thread.getStackTrace()) |
| 672 | buf.append(" at ").append(element.toString()).append('\n'); |
| 673 | return buf.toString(); |
| 674 | } |
| 675 | } |
| 676 | return null; |
| 677 | } |
| 678 | } |