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20 package org.apache.mina.core.polling;
21
22 import java.net.ConnectException;
23 import java.net.SocketAddress;
24 import java.nio.channels.ClosedSelectorException;
25 import java.util.Iterator;
26 import java.util.Queue;
27 import java.util.concurrent.ConcurrentLinkedQueue;
28 import java.util.concurrent.Executor;
29 import java.util.concurrent.Executors;
30 import java.util.concurrent.atomic.AtomicReference;
31
32 import org.apache.mina.core.RuntimeIoException;
33 import org.apache.mina.core.filterchain.IoFilter;
34 import org.apache.mina.core.future.ConnectFuture;
35 import org.apache.mina.core.future.DefaultConnectFuture;
36 import org.apache.mina.core.service.AbstractIoConnector;
37 import org.apache.mina.core.service.IoConnector;
38 import org.apache.mina.core.service.IoHandler;
39 import org.apache.mina.core.service.IoProcessor;
40 import org.apache.mina.core.service.SimpleIoProcessorPool;
41 import org.apache.mina.core.session.AbstractIoSession;
42 import org.apache.mina.core.session.IoSession;
43 import org.apache.mina.core.session.IoSessionConfig;
44 import org.apache.mina.core.session.IoSessionInitializer;
45 import org.apache.mina.transport.socket.nio.NioSocketConnector;
46 import org.apache.mina.util.ExceptionMonitor;
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64 public abstract class AbstractPollingIoConnector<T extends AbstractIoSession, H> extends AbstractIoConnector {
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66 private final Queue<ConnectionRequest> connectQueue = new ConcurrentLinkedQueue<ConnectionRequest>();
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68 private final Queue<ConnectionRequest> cancelQueue = new ConcurrentLinkedQueue<ConnectionRequest>();
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70 private final IoProcessor<T> processor;
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72 private final boolean createdProcessor;
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74 private final ServiceOperationFuture disposalFuture = new ServiceOperationFuture();
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76 private volatile boolean selectable;
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79 private final AtomicReference<Connector> connectorRef = new AtomicReference<Connector>();
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94 protected AbstractPollingIoConnector(IoSessionConfig sessionConfig, Class<? extends IoProcessor<T>> processorClass) {
95 this(sessionConfig, null, new SimpleIoProcessorPool<T>(processorClass), true);
96 }
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112 protected AbstractPollingIoConnector(IoSessionConfig sessionConfig, Class<? extends IoProcessor<T>> processorClass,
113 int processorCount) {
114 this(sessionConfig, null, new SimpleIoProcessorPool<T>(processorClass, processorCount), true);
115 }
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129 protected AbstractPollingIoConnector(IoSessionConfig sessionConfig, IoProcessor<T> processor) {
130 this(sessionConfig, null, processor, false);
131 }
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149 protected AbstractPollingIoConnector(IoSessionConfig sessionConfig, Executor executor, IoProcessor<T> processor) {
150 this(sessionConfig, executor, processor, false);
151 }
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170 private AbstractPollingIoConnector(IoSessionConfig sessionConfig, Executor executor, IoProcessor<T> processor,
171 boolean createdProcessor) {
172 super(sessionConfig, executor);
173
174 if (processor == null) {
175 throw new IllegalArgumentException("processor");
176 }
177
178 this.processor = processor;
179 this.createdProcessor = createdProcessor;
180
181 try {
182 init();
183 selectable = true;
184 } catch (RuntimeException e) {
185 throw e;
186 } catch (Exception e) {
187 throw new RuntimeIoException("Failed to initialize.", e);
188 } finally {
189 if (!selectable) {
190 try {
191 destroy();
192 } catch (Exception e) {
193 ExceptionMonitor.getInstance().exceptionCaught(e);
194 }
195 }
196 }
197 }
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203 protected abstract void init() throws Exception;
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210 protected abstract void destroy() throws Exception;
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218 protected abstract H newHandle(SocketAddress localAddress) throws Exception;
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230 protected abstract boolean connect(H handle, SocketAddress remoteAddress) throws Exception;
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240 protected abstract boolean finishConnect(H handle) throws Exception;
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251 protected abstract T newSession(IoProcessor<T> processor, H handle) throws Exception;
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258 protected abstract void close(H handle) throws Exception;
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263 protected abstract void wakeup();
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272 protected abstract int select(int timeout) throws Exception;
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279 protected abstract Iterator<H> selectedHandles();
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285 protected abstract Iterator<H> allHandles();
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293 protected abstract void register(H handle, ConnectionRequest request) throws Exception;
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300 protected abstract ConnectionRequest getConnectionRequest(H handle);
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305 @Override
306 protected final void dispose0() throws Exception {
307 startupWorker();
308 wakeup();
309 }
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314 @Override
315 @SuppressWarnings("unchecked")
316 protected final ConnectFuture connect0(SocketAddress remoteAddress, SocketAddress localAddress,
317 IoSessionInitializer<? extends ConnectFuture> sessionInitializer) {
318 H handle = null;
319 boolean success = false;
320 try {
321 handle = newHandle(localAddress);
322 if (connect(handle, remoteAddress)) {
323 ConnectFuture future = new DefaultConnectFuture();
324 T session = newSession(processor, handle);
325 initSession(session, future, sessionInitializer);
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327 session.getProcessor().add(session);
328 success = true;
329 return future;
330 }
331
332 success = true;
333 } catch (Exception e) {
334 return DefaultConnectFuture.newFailedFuture(e);
335 } finally {
336 if (!success && handle != null) {
337 try {
338 close(handle);
339 } catch (Exception e) {
340 ExceptionMonitor.getInstance().exceptionCaught(e);
341 }
342 }
343 }
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345 ConnectionRequest request = new ConnectionRequest(handle, sessionInitializer);
346 connectQueue.add(request);
347 startupWorker();
348 wakeup();
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350 return request;
351 }
352
353 private void startupWorker() {
354 if (!selectable) {
355 connectQueue.clear();
356 cancelQueue.clear();
357 }
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359 Connector connector = connectorRef.get();
360
361 if (connector == null) {
362 connector = new Connector();
363
364 if (connectorRef.compareAndSet(null, connector)) {
365 executeWorker(connector);
366 }
367 }
368 }
369
370 private int registerNew() {
371 int nHandles = 0;
372 for (;;) {
373 ConnectionRequest req = connectQueue.poll();
374 if (req == null) {
375 break;
376 }
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378 H handle = req.handle;
379 try {
380 register(handle, req);
381 nHandles++;
382 } catch (Exception e) {
383 req.setException(e);
384 try {
385 close(handle);
386 } catch (Exception e2) {
387 ExceptionMonitor.getInstance().exceptionCaught(e2);
388 }
389 }
390 }
391 return nHandles;
392 }
393
394 private int cancelKeys() {
395 int nHandles = 0;
396
397 for (;;) {
398 ConnectionRequest req = cancelQueue.poll();
399
400 if (req == null) {
401 break;
402 }
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404 H handle = req.handle;
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406 try {
407 close(handle);
408 } catch (Exception e) {
409 ExceptionMonitor.getInstance().exceptionCaught(e);
410 } finally {
411 nHandles++;
412 }
413 }
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415 if (nHandles > 0) {
416 wakeup();
417 }
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419 return nHandles;
420 }
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426 private int processConnections(Iterator<H> handlers) {
427 int nHandles = 0;
428
429
430 while (handlers.hasNext()) {
431 H handle = handlers.next();
432 handlers.remove();
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434 ConnectionRequest connectionRequest = getConnectionRequest(handle);
435
436 if (connectionRequest == null) {
437 continue;
438 }
439
440 boolean success = false;
441 try {
442 if (finishConnect(handle)) {
443 T session = newSession(processor, handle);
444 initSession(session, connectionRequest, connectionRequest.getSessionInitializer());
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446 session.getProcessor().add(session);
447 nHandles++;
448 }
449 success = true;
450 } catch (Throwable e) {
451 connectionRequest.setException(e);
452 } finally {
453 if (!success) {
454
455 cancelQueue.offer(connectionRequest);
456 }
457 }
458 }
459 return nHandles;
460 }
461
462 private void processTimedOutSessions(Iterator<H> handles) {
463 long currentTime = System.currentTimeMillis();
464
465 while (handles.hasNext()) {
466 H handle = handles.next();
467 ConnectionRequest connectionRequest = getConnectionRequest(handle);
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469 if ((connectionRequest != null) && (currentTime >= connectionRequest.deadline)) {
470 connectionRequest.setException(new ConnectException("Connection timed out."));
471 cancelQueue.offer(connectionRequest);
472 }
473 }
474 }
475
476 private class Connector implements Runnable {
477
478 public void run() {
479 assert (connectorRef.get() == this);
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481 int nHandles = 0;
482
483 while (selectable) {
484 try {
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487 int timeout = (int) Math.min(getConnectTimeoutMillis(), 1000L);
488 int selected = select(timeout);
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490 nHandles += registerNew();
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493 if (nHandles == 0) {
494 connectorRef.set(null);
495
496 if (connectQueue.isEmpty()) {
497 assert (connectorRef.get() != this);
498 break;
499 }
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501 if (!connectorRef.compareAndSet(null, this)) {
502 assert (connectorRef.get() != this);
503 break;
504 }
505
506 assert (connectorRef.get() == this);
507 }
508
509 if (selected > 0) {
510 nHandles -= processConnections(selectedHandles());
511 }
512
513 processTimedOutSessions(allHandles());
514
515 nHandles -= cancelKeys();
516 } catch (ClosedSelectorException cse) {
517
518 break;
519 } catch (Throwable e) {
520 ExceptionMonitor.getInstance().exceptionCaught(e);
521
522 try {
523 Thread.sleep(1000);
524 } catch (InterruptedException e1) {
525 ExceptionMonitor.getInstance().exceptionCaught(e1);
526 }
527 }
528 }
529
530 if (selectable && isDisposing()) {
531 selectable = false;
532 try {
533 if (createdProcessor) {
534 processor.dispose();
535 }
536 } finally {
537 try {
538 synchronized (disposalLock) {
539 if (isDisposing()) {
540 destroy();
541 }
542 }
543 } catch (Exception e) {
544 ExceptionMonitor.getInstance().exceptionCaught(e);
545 } finally {
546 disposalFuture.setDone();
547 }
548 }
549 }
550 }
551 }
552
553 public final class ConnectionRequest extends DefaultConnectFuture {
554 private final H handle;
555
556 private final long deadline;
557
558 private final IoSessionInitializer<? extends ConnectFuture> sessionInitializer;
559
560 public ConnectionRequest(H handle, IoSessionInitializer<? extends ConnectFuture> callback) {
561 this.handle = handle;
562 long timeout = getConnectTimeoutMillis();
563 if (timeout <= 0L) {
564 this.deadline = Long.MAX_VALUE;
565 } else {
566 this.deadline = System.currentTimeMillis() + timeout;
567 }
568 this.sessionInitializer = callback;
569 }
570
571 public H getHandle() {
572 return handle;
573 }
574
575 public long getDeadline() {
576 return deadline;
577 }
578
579 public IoSessionInitializer<? extends ConnectFuture> getSessionInitializer() {
580 return sessionInitializer;
581 }
582
583 @Override
584 public void cancel() {
585 if (!isDone()) {
586 super.cancel();
587 cancelQueue.add(this);
588 startupWorker();
589 wakeup();
590 }
591 }
592 }
593 }