src/jalview/workers/AlignCalcManager2.java

   1 package jalview.workers;
   2
   3 import java.util.HashMap;
   4 import java.util.List;
   5 import java.util.Map;
   6 import java.util.NoSuchElementException;
   7 import java.util.Objects;
   8 import java.util.WeakHashMap;
   9 import java.util.concurrent.CopyOnWriteArrayList;
  10 import java.util.concurrent.Executors;
  11 import java.util.concurrent.Future;
  12 import java.util.concurrent.ScheduledExecutorService;
  13 import java.util.concurrent.TimeUnit;
  14
  15 import static java.lang.String.format;
  16 import static java.util.Collections.synchronizedMap;
  17 import static java.util.Collections.unmodifiableList;
  18
  19 import java.util.ArrayList;
  20
  21 import jalview.api.AlignCalcListener;
  22 import jalview.api.AlignCalcManagerI2;
  23 import jalview.api.AlignCalcWorkerI;
  24 import jalview.api.PollableAlignCalcWorkerI;
  25 import jalview.bin.Cache;
  26 import jalview.datamodel.AlignmentAnnotation;
  27
  28 public class AlignCalcManager2 implements AlignCalcManagerI2
  29 {
  30   private abstract class WorkerManager
  31   {
  32     protected volatile boolean enabled = true;
  33
  34     protected AlignCalcWorkerI worker;
  35
  36     WorkerManager(AlignCalcWorkerI worker)
  37     {
  38       this.worker = worker;
  39     }
  40
  41     protected AlignCalcWorkerI getWorker()
  42     {
  43       return worker;
  44     }
  45
  46     boolean isEnabled()
  47     {
  48       return enabled;
  49     }
  50
  51     void setEnabled(boolean enabled)
  52     {
  53       this.enabled = enabled;
  54     }
  55
  56     synchronized void restart()
  57     {
  58       if (!isEnabled())
  59       {
  60         return;
  61       }
  62       if (!isRestartable())
  63       {
  64         setEnabled(false);
  65       }
  66       if (isWorking())
  67       {
  68         cancel();
  69       }
  70       submit();
  71     }
  72
  73     protected boolean isRestartable()
  74     {
  75       return registered.containsKey(getWorker());
  76     }
  77
  78     abstract boolean isWorking();
  79
  80     protected abstract void submit();
  81
  82     abstract void cancel();
  83   }
  84
  85   private class SimpleWorkerManager extends WorkerManager
  86   {
  87     private Future<?> task = null;
  88
  89     SimpleWorkerManager(AlignCalcWorkerI worker)
  90     {
  91       super(worker);
  92     }
  93
  94     @Override
  95     boolean isWorking()
  96     {
  97       return task != null && !task.isDone();
  98     }
  99
 100     @Override
 101     protected void submit()
 102     {
 103       if (task != null && !(task.isDone() || task.isCancelled()))
 104       {
 105         throw new IllegalStateException(
 106                 "Cannot submit new task if the prevoius one is still running");
 107       }
 108       Cache.log.debug(
 109               format("Worker %s queued", getWorker().getClass().getName()));
 110       task = executor.submit(() -> {
 111         try
 112         {
 113           Cache.log.debug(format("Worker %s started",
 114                   getWorker().getClass().getName()));
 115           getWorker().run();
 116           Cache.log.debug(format("Worker %s finished",
 117                   getWorker().getClass().getName()));
 118         } catch (InterruptedException e)
 119         {
 120           Cache.log.debug(format("Worker %s interrupted",
 121                   getWorker().getClass().getName()));
 122         } catch (Throwable th)
 123         {
 124           Cache.log.debug(format("Worker %s failed",
 125                   getWorker().getClass().getName()), th);
 126         } finally
 127         {
 128           if (!isRestartable())
 129           {
 130             // delete worker reference so garbage collector can remove it
 131             worker = null;
 132           }
 133         }
 134       });
 135     }
 136
 137     @Override
 138     synchronized void cancel()
 139     {
 140       if (!isWorking())
 141       {
 142         return;
 143       }
 144       Cache.log.debug(format("Cancelling worker %s",
 145               getWorker().getClass().getName()));
 146       task.cancel(true);
 147     }
 148   }
 149
 150   private class PollableWorkerManager extends WorkerManager
 151   {
 152     private Future<?> task = null;
 153
 154     PollableWorkerManager(PollableAlignCalcWorkerI worker)
 155     {
 156       super(worker);
 157     }
 158
 159     @Override
 160     protected PollableAlignCalcWorkerI getWorker()
 161     {
 162       return (PollableAlignCalcWorkerI) super.getWorker();
 163     }
 164
 165     @Override
 166     boolean isWorking()
 167     {
 168       return task != null && !task.isDone();
 169     }
 170
 171     protected void submit()
 172     {
 173       if (task != null && !(task.isDone() || task.isCancelled()))
 174       {
 175         throw new IllegalStateException(
 176                 "Cannot submit new task if the prevoius one is still running");
 177       }
 178       Cache.log.debug(
 179               format("Worker %s queued", getWorker().getClass().getName()));
 180       final var runnable = new Runnable()
 181       {
 182         private boolean started = false;
 183
 184         private boolean completed = false;
 185
 186         Future<?> future = null;
 187
 188         @Override
 189         public void run()
 190         {
 191           try
 192           {
 193             if (!started)
 194             {
 195               Cache.log.debug(format("Worker %s started",
 196                       getWorker().getClass().getName()));
 197               getWorker().startUp();
 198               started = true;
 199             }
 200             else if (!completed)
 201             {
 202               Cache.log.debug(format("Polling worker %s",
 203                       getWorker().getClass().getName()));
 204               if (getWorker().poll())
 205               {
 206                 Cache.log.debug(format("Worker %s finished",
 207                         getWorker().getClass().getName()));
 208                 completed = true;
 209               }
 210             }
 211           } catch (Throwable th)
 212           {
 213             Cache.log.debug(format("Worker %s failed",
 214                     getWorker().getClass().getName()), th);
 215             completed = true;
 216           }
 217           if (completed)
 218           {
 219             final var worker = getWorker();
 220             if (!isRestartable())
 221               PollableWorkerManager.super.worker = null;
 222             Cache.log.debug(format("Finalizing completed worker %s",
 223                     worker.getClass().getName()));
 224             worker.done();
 225             // almost impossible, but the future may be null at this point
 226             // let it throw NPE to cancel forcefully
 227             future.cancel(false);
 228           }
 229         }
 230       };
 231       runnable.future = task = executor.scheduleWithFixedDelay(runnable, 10,
 232               1000, TimeUnit.MILLISECONDS);
 233     }
 234
 235     synchronized protected void cancel()
 236     {
 237       if (!isWorking())
 238       {
 239         return;
 240       }
 241       Cache.log.debug(format("Cancelling worker %s",
 242               getWorker().getClass().getName()));
 243       task.cancel(false);
 244       executor.submit(() -> {
 245         final var worker = getWorker();
 246         if (!isRestartable())
 247           PollableWorkerManager.super.worker = null;
 248         if (worker != null)
 249         {
 250           worker.cancel();
 251           Cache.log.debug(format("Finalizing cancelled worker %s",
 252                   worker.getClass().getName()));
 253           worker.done();
 254         }
 255       });
 256     }
 257   }
 258
 259   private final ScheduledExecutorService executor = Executors
 260           .newSingleThreadScheduledExecutor();
 261
 262   private final Map<AlignCalcWorkerI, WorkerManager> registered = synchronizedMap(
 263           new HashMap<>());
 264
 265   private final Map<AlignCalcWorkerI, WorkerManager> oneshot = synchronizedMap(
 266           new WeakHashMap<>());
 267
 268   private final List<AlignCalcListener> listeners = new CopyOnWriteArrayList<>();
 269
 270   private WorkerManager createManager(AlignCalcWorkerI worker)
 271   {
 272     if (worker instanceof PollableAlignCalcWorkerI)
 273     {
 274       return new PollableWorkerManager((PollableAlignCalcWorkerI) worker);
 275     }
 276     else
 277     {
 278       return new SimpleWorkerManager(worker);
 279     }
 280   }
 281
 282   @Override
 283   public void registerWorker(AlignCalcWorkerI worker)
 284   {
 285     Objects.requireNonNull(worker);
 286     WorkerManager manager = createManager(worker);
 287     registered.putIfAbsent(worker, manager);
 288     startWorker(worker);
 289   }
 290
 291   @Override
 292   public List<AlignCalcWorkerI> getWorkers()
 293   {
 294     List<AlignCalcWorkerI> result = new ArrayList<>(registered.size());
 295     result.addAll(registered.keySet());
 296     return result;
 297   }
 298
 299   @Override
 300   public List<AlignCalcWorkerI> getWorkersOfClass(
 301           Class<? extends AlignCalcWorkerI> cls)
 302   {
 303     List<AlignCalcWorkerI> collected = new ArrayList<>();
 304     for (var worker : getWorkers())
 305     {
 306       if (worker.getClass().equals(cls))
 307       {
 308         collected.add(worker);
 309       }
 310     }
 311     return unmodifiableList(collected);
 312   }
 313
 314   @Override
 315   public void removeWorker(AlignCalcWorkerI worker)
 316   {
 317     registered.remove(worker);
 318   }
 319
 320   @Override
 321   public void removeWorkerForAnnotation(AlignmentAnnotation annot)
 322   {
 323     synchronized (registered)
 324     {
 325       for (var worker : getWorkers())
 326       {
 327         if (worker.involves(annot) && worker.isDeletable())
 328         {
 329           removeWorker(worker);
 330         }
 331       }
 332     }
 333   }
 334
 335   @Override
 336   public void removeWorkersOfClass(Class<? extends AlignCalcWorkerI> cls)
 337   {
 338     synchronized (registered)
 339     {
 340       for (var worker : getWorkers())
 341       {
 342         if (worker.getClass().equals(cls))
 343         {
 344           removeWorker(worker);
 345         }
 346       }
 347     }
 348   }
 349
 350   @Override
 351   public void disableWorker(AlignCalcWorkerI worker)
 352   {
 353     // Null pointer check might be needed
 354     registered.get(worker).setEnabled(false);
 355   }
 356
 357   @Override
 358   public void enableWorker(AlignCalcWorkerI worker)
 359   {
 360     // Null pointer check might be needed
 361     registered.get(worker).setEnabled(true);
 362   }
 363
 364   @Override
 365   public boolean isDisabled(AlignCalcWorkerI worker)
 366   {
 367     if (registered.containsKey(worker))
 368     {
 369       return !registered.get(worker).isEnabled();
 370     }
 371     else
 372     {
 373       return false;
 374     }
 375   }
 376
 377   @Override
 378   public boolean isWorking(AlignCalcWorkerI worker)
 379   {
 380     var manager = registered.get(worker);
 381     if (manager == null)
 382       manager = oneshot.get(worker);
 383     if (manager == null)
 384       return false;
 385     else
 386       return manager.isWorking();
 387   }
 388
 389   @Override
 390   public boolean isWorkingWithAnnotation(AlignmentAnnotation annot)
 391   {
 392     synchronized (registered)
 393     {
 394       for (var entry : registered.entrySet())
 395         if (entry.getKey().involves(annot) && entry.getValue().isWorking())
 396           return true;
 397     }
 398     synchronized (oneshot)
 399     {
 400       for (var entry : registered.entrySet())
 401         if (entry.getKey().involves(annot) && entry.getValue().isWorking())
 402           return true;
 403     }
 404     return false;
 405   }
 406
 407   @Override
 408   public boolean isWorking()
 409   {
 410     synchronized (registered)
 411     {
 412       for (var manager : registered.values())
 413         if (manager.isWorking())
 414           return true;
 415     }
 416     synchronized (oneshot)
 417     {
 418       for (var manager : oneshot.values())
 419         if (manager.isWorking())
 420           return true;
 421     }
 422     return false;
 423   }
 424
 425   @Override
 426   public void startWorker(AlignCalcWorkerI worker)
 427   {
 428     Objects.requireNonNull(worker);
 429     var manager = registered.get(worker);
 430     if (manager == null)
 431     {
 432       Cache.log.warn("Starting unregistered worker " + worker);
 433       manager = createManager(worker);
 434       oneshot.put(worker, manager);
 435     }
 436     manager.restart();
 437   }
 438
 439   @Override
 440   public void restartWorkers()
 441   {
 442     synchronized (registered)
 443     {
 444       for (var manager : registered.values())
 445       {
 446         manager.restart();
 447       }
 448     }
 449   }
 450
 451   @Override
 452   public void cancelWorker(AlignCalcWorkerI worker)
 453   {
 454     Objects.requireNonNull(worker);
 455     var manager = registered.get(worker);
 456     if (manager == null)
 457       manager = oneshot.get(worker);
 458     if (manager == null)
 459     {
 460       throw new NoSuchElementException();
 461     }
 462     manager.cancel();
 463   }
 464
 465   private void notifyQueued(AlignCalcWorkerI worker)
 466   {
 467     for (AlignCalcListener listener : listeners)
 468     {
 469       listener.workerQueued(worker);
 470     }
 471   }
 472
 473   private void notifyStarted(AlignCalcWorkerI worker)
 474   {
 475     for (AlignCalcListener listener : listeners)
 476     {
 477       listener.workerStarted(worker);
 478     }
 479   }
 480
 481   private void notifyCompleted(AlignCalcWorkerI worker)
 482   {
 483     for (AlignCalcListener listener : listeners)
 484     {
 485       try
 486       {
 487         listener.workerCompleted(worker);
 488       } catch (RuntimeException e)
 489       {
 490         e.printStackTrace();
 491       }
 492     }
 493   }
 494
 495   private void notifyCancelled(AlignCalcWorkerI worker)
 496   {
 497     for (AlignCalcListener listener : listeners)
 498     {
 499       try
 500       {
 501         listener.workerCancelled(worker);
 502       } catch (RuntimeException e)
 503       {
 504         e.printStackTrace();
 505       }
 506     }
 507   }
 508
 509   private void notifyExceptional(AlignCalcWorkerI worker,
 510           Throwable throwable)
 511   {
 512     for (AlignCalcListener listener : listeners)
 513     {
 514       try
 515       {
 516         listener.workerExceptional(worker, throwable);
 517       } catch (RuntimeException e)
 518       {
 519         e.printStackTrace();
 520       }
 521     }
 522   }
 523
 524   @Override
 525   public void addAlignCalcListener(AlignCalcListener listener)
 526   {
 527     listeners.add(listener);
 528   }
 529
 530   @Override
 531   public void removeAlignCalcListener(AlignCalcListener listener)
 532   {
 533     listeners.remove(listener);
 534   }
 535
 536   @Override
 537   public void shutdown()
 538   {
 539     executor.shutdownNow();
 540     listeners.clear();
 541     registered.clear();
 542   }
 543
 544 }