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20 package org.apache.mina.filter.codec;
21
22 import java.net.SocketAddress;
23 import java.util.Queue;
24
25 import org.apache.mina.core.buffer.IoBuffer;
26 import org.apache.mina.core.file.FileRegion;
27 import org.apache.mina.core.filterchain.IoFilter;
28 import org.apache.mina.core.filterchain.IoFilterAdapter;
29 import org.apache.mina.core.filterchain.IoFilterChain;
30 import org.apache.mina.core.future.DefaultWriteFuture;
31 import org.apache.mina.core.future.WriteFuture;
32 import org.apache.mina.core.session.AttributeKey;
33 import org.apache.mina.core.session.IoSession;
34 import org.apache.mina.core.write.DefaultWriteRequest;
35 import org.apache.mina.core.write.NothingWrittenException;
36 import org.apache.mina.core.write.WriteRequest;
37 import org.apache.mina.core.write.WriteRequestWrapper;
38 import org.slf4j.Logger;
39 import org.slf4j.LoggerFactory;
40
41
42
43
44
45
46
47
48
49
50 public class ProtocolCodecFilter extends IoFilterAdapter {
51
52 private static final Class<?>[] EMPTY_PARAMS = new Class[0];
53 private static final IoBuffer EMPTY_BUFFER = IoBuffer.wrap(new byte[0]);
54
55 private final AttributeKey ENCODER = new AttributeKey(getClass(), "encoder");
56 private final AttributeKey DECODER = new AttributeKey(getClass(), "decoder");
57 private final AttributeKey DECODER_OUT = new AttributeKey(getClass(), "decoderOut");
58 private final AttributeKey ENCODER_OUT = new AttributeKey(getClass(), "encoderOut");
59
60
61 private final ProtocolCodecFactory factory;
62
63 private final Logger logger = LoggerFactory.getLogger(getClass());
64
65
66
67
68
69
70
71
72 public ProtocolCodecFilter(ProtocolCodecFactory factory) {
73 if (factory == null) {
74 throw new NullPointerException("factory");
75 }
76 this.factory = factory;
77 }
78
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86
87
88 public ProtocolCodecFilter(final ProtocolEncoder encoder,
89 final ProtocolDecoder decoder) {
90 if (encoder == null) {
91 throw new NullPointerException("encoder");
92 }
93 if (decoder == null) {
94 throw new NullPointerException("decoder");
95 }
96
97
98 this.factory = new ProtocolCodecFactory() {
99 public ProtocolEncoder getEncoder(IoSession session) {
100 return encoder;
101 }
102
103 public ProtocolDecoder getDecoder(IoSession session) {
104 return decoder;
105 }
106 };
107 }
108
109
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116
117
118 public ProtocolCodecFilter(
119 final Class<? extends ProtocolEncoder> encoderClass,
120 final Class<? extends ProtocolDecoder> decoderClass) {
121 if (encoderClass == null) {
122 throw new NullPointerException("encoderClass");
123 }
124 if (decoderClass == null) {
125 throw new NullPointerException("decoderClass");
126 }
127 if (!ProtocolEncoder.class.isAssignableFrom(encoderClass)) {
128 throw new IllegalArgumentException("encoderClass: "
129 + encoderClass.getName());
130 }
131 if (!ProtocolDecoder.class.isAssignableFrom(decoderClass)) {
132 throw new IllegalArgumentException("decoderClass: "
133 + decoderClass.getName());
134 }
135 try {
136 encoderClass.getConstructor(EMPTY_PARAMS);
137 } catch (NoSuchMethodException e) {
138 throw new IllegalArgumentException(
139 "encoderClass doesn't have a public default constructor.");
140 }
141 try {
142 decoderClass.getConstructor(EMPTY_PARAMS);
143 } catch (NoSuchMethodException e) {
144 throw new IllegalArgumentException(
145 "decoderClass doesn't have a public default constructor.");
146 }
147
148
149
150 this.factory = new ProtocolCodecFactory() {
151 public ProtocolEncoder getEncoder(IoSession session) throws Exception {
152 return encoderClass.newInstance();
153 }
154
155 public ProtocolDecoder getDecoder(IoSession session) throws Exception {
156 return decoderClass.newInstance();
157 }
158 };
159 }
160
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165
166
167
168 public ProtocolEncoder getEncoder(IoSession session) {
169 return (ProtocolEncoder) session.getAttribute(ENCODER);
170 }
171
172 @Override
173 public void onPreAdd(IoFilterChain parent, String name,
174 NextFilter nextFilter) throws Exception {
175 if (parent.contains(this)) {
176 throw new IllegalArgumentException(
177 "You can't add the same filter instance more than once. Create another instance and add it.");
178 }
179
180
181 initCodec(parent.getSession());
182 }
183
184 @Override
185 public void onPostRemove(IoFilterChain parent, String name,
186 NextFilter nextFilter) throws Exception {
187
188 disposeCodec(parent.getSession());
189 }
190
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201
202
203 @Override
204 public void messageReceived(NextFilter nextFilter, IoSession session,
205 Object message) throws Exception {
206 if (!(message instanceof IoBuffer)) {
207 nextFilter.messageReceived(session, message);
208 return;
209 }
210
211 IoBuffer in = (IoBuffer) message;
212 ProtocolDecoder decoder = getDecoder(session);
213 ProtocolDecoderOutput decoderOut = getDecoderOut(session, nextFilter);
214
215
216
217
218
219 while (in.hasRemaining()) {
220 int oldPos = in.position();
221 try {
222 synchronized (decoderOut) {
223
224 decoder.decode(session, in, decoderOut);
225 }
226
227
228 decoderOut.flush(nextFilter, session);
229 } catch (Throwable t) {
230 ProtocolDecoderException pde;
231 if (t instanceof ProtocolDecoderException) {
232 pde = (ProtocolDecoderException) t;
233 } else {
234 pde = new ProtocolDecoderException(t);
235 }
236
237 if (pde.getHexdump() == null) {
238
239 int curPos = in.position();
240 in.position(oldPos);
241 pde.setHexdump(in.getHexDump());
242 in.position(curPos);
243 }
244
245
246 decoderOut.flush(nextFilter, session);
247 nextFilter.exceptionCaught(session, pde);
248
249
250
251
252
253 if (!(t instanceof RecoverableProtocolDecoderException) ||
254 (in.position() == oldPos)) {
255 break;
256 }
257 }
258 }
259 }
260
261 @Override
262 public void messageSent(NextFilter nextFilter, IoSession session,
263 WriteRequest writeRequest) throws Exception {
264 if (writeRequest instanceof EncodedWriteRequest) {
265 return;
266 }
267
268 if (!(writeRequest instanceof MessageWriteRequest)) {
269 nextFilter.messageSent(session, writeRequest);
270 return;
271 }
272
273 MessageWriteRequest wrappedRequest = (MessageWriteRequest) writeRequest;
274 nextFilter.messageSent(session, wrappedRequest.getParentRequest());
275 }
276
277 @Override
278 public void filterWrite(NextFilter nextFilter, IoSession session,
279 WriteRequest writeRequest) throws Exception {
280 Object message = writeRequest.getMessage();
281
282
283
284 if (message instanceof IoBuffer || message instanceof FileRegion) {
285 nextFilter.filterWrite(session, writeRequest);
286 return;
287 }
288
289
290 ProtocolEncoder encoder = getEncoder(session);
291
292 ProtocolEncoderOutput encoderOut = getEncoderOut(session,
293 nextFilter, writeRequest);
294
295 try {
296
297 encoder.encode(session, message, encoderOut);
298
299
300 ((ProtocolEncoderOutputImpl)encoderOut).flushWithoutFuture();
301
302
303 nextFilter.filterWrite(session, new MessageWriteRequest(
304 writeRequest));
305 } catch (Throwable t) {
306 ProtocolEncoderException pee;
307
308
309 if (t instanceof ProtocolEncoderException) {
310 pee = (ProtocolEncoderException) t;
311 } else {
312 pee = new ProtocolEncoderException(t);
313 }
314
315 throw pee;
316 }
317 }
318
319
320 @Override
321 public void sessionClosed(NextFilter nextFilter, IoSession session)
322 throws Exception {
323
324 ProtocolDecoder decoder = getDecoder(session);
325 ProtocolDecoderOutput decoderOut = getDecoderOut(session, nextFilter);
326
327 try {
328 decoder.finishDecode(session, decoderOut);
329 } catch (Throwable t) {
330 ProtocolDecoderException pde;
331 if (t instanceof ProtocolDecoderException) {
332 pde = (ProtocolDecoderException) t;
333 } else {
334 pde = new ProtocolDecoderException(t);
335 }
336 throw pde;
337 } finally {
338
339 disposeCodec(session);
340 decoderOut.flush(nextFilter, session);
341 }
342
343
344 nextFilter.sessionClosed(session);
345 }
346
347 private static class EncodedWriteRequest extends DefaultWriteRequest {
348 private EncodedWriteRequest(Object encodedMessage,
349 WriteFuture future, SocketAddress destination) {
350 super(encodedMessage, future, destination);
351 }
352 }
353
354 private static class MessageWriteRequest extends WriteRequestWrapper {
355 private MessageWriteRequest(WriteRequest writeRequest) {
356 super(writeRequest);
357 }
358
359 @Override
360 public Object getMessage() {
361 return EMPTY_BUFFER;
362 }
363 }
364
365 private static class ProtocolDecoderOutputImpl extends
366 AbstractProtocolDecoderOutput {
367 public ProtocolDecoderOutputImpl() {
368 }
369
370 public void flush(NextFilter nextFilter, IoSession session) {
371 Queue<Object> messageQueue = getMessageQueue();
372 while (!messageQueue.isEmpty()) {
373 nextFilter.messageReceived(session, messageQueue.poll());
374 }
375 }
376 }
377
378 private static class ProtocolEncoderOutputImpl extends
379 AbstractProtocolEncoderOutput {
380 private final IoSession session;
381
382 private final NextFilter nextFilter;
383
384 private final WriteRequest writeRequest;
385
386 public ProtocolEncoderOutputImpl(IoSession session,
387 NextFilter nextFilter, WriteRequest writeRequest) {
388 this.session = session;
389 this.nextFilter = nextFilter;
390 this.writeRequest = writeRequest;
391 }
392
393 public WriteFuture flush() {
394 Queue<Object> bufferQueue = getMessageQueue();
395 WriteFuture future = null;
396 for (;;) {
397 Object encodedMessage = bufferQueue.poll();
398 if (encodedMessage == null) {
399 break;
400 }
401
402
403 if (!(encodedMessage instanceof IoBuffer) ||
404 ((IoBuffer) encodedMessage).hasRemaining()) {
405 future = new DefaultWriteFuture(session);
406 nextFilter.filterWrite(session, new EncodedWriteRequest(encodedMessage,
407 future, writeRequest.getDestination()));
408 }
409 }
410
411 if (future == null) {
412 future = DefaultWriteFuture.newNotWrittenFuture(
413 session, new NothingWrittenException(writeRequest));
414 }
415
416 return future;
417 }
418
419 public void flushWithoutFuture() {
420 Queue<Object> bufferQueue = getMessageQueue();
421 for (;;) {
422 Object encodedMessage = bufferQueue.poll();
423 if (encodedMessage == null) {
424 break;
425 }
426
427
428 if (!(encodedMessage instanceof IoBuffer) ||
429 ((IoBuffer) encodedMessage).hasRemaining()) {
430 SocketAddress destination = writeRequest.getDestination();
431 WriteRequest writeRequest = new EncodedWriteRequest(
432 encodedMessage, null, destination);
433 nextFilter.filterWrite(session, writeRequest);
434 }
435 }
436 }
437 }
438
439
440
441
442
443
444 private void initCodec(IoSession session) throws Exception {
445
446 ProtocolDecoder decoder = factory.getDecoder(session);
447 session.setAttribute(DECODER, decoder);
448
449
450 ProtocolEncoder encoder = factory.getEncoder(session);
451 session.setAttribute(ENCODER, encoder);
452 }
453
454
455
456
457
458 private void disposeCodec(IoSession session) {
459
460
461 disposeEncoder(session);
462 disposeDecoder(session);
463
464
465 disposeDecoderOut(session);
466 }
467
468
469
470
471
472
473 private void disposeEncoder(IoSession session) {
474 ProtocolEncoder encoder = (ProtocolEncoder) session
475 .removeAttribute(ENCODER);
476 if (encoder == null) {
477 return;
478 }
479
480 try {
481 encoder.dispose(session);
482 } catch (Throwable t) {
483 logger.warn(
484 "Failed to dispose: " + encoder.getClass().getName() + " (" + encoder + ')');
485 }
486 }
487
488
489
490
491
492
493
494 private ProtocolDecoder getDecoder(IoSession session) {
495 return (ProtocolDecoder) session.getAttribute(DECODER);
496 }
497
498
499
500
501
502
503 private void disposeDecoder(IoSession session) {
504 ProtocolDecoder decoder = (ProtocolDecoder) session
505 .removeAttribute(DECODER);
506 if (decoder == null) {
507 return;
508 }
509
510 try {
511 decoder.dispose(session);
512 } catch (Throwable t) {
513 logger.warn(
514 "Falied to dispose: " + decoder.getClass().getName() + " (" + decoder + ')');
515 }
516 }
517
518
519
520
521
522 private ProtocolDecoderOutput getDecoderOut(IoSession session,
523 NextFilter nextFilter) {
524 ProtocolDecoderOutput out = (ProtocolDecoderOutput) session.getAttribute(DECODER_OUT);
525
526 if (out == null) {
527
528 out = new ProtocolDecoderOutputImpl();
529 session.setAttribute(DECODER_OUT, out);
530 }
531
532 return out;
533 }
534
535 private ProtocolEncoderOutput getEncoderOut(IoSession session,
536 NextFilter nextFilter, WriteRequest writeRequest) {
537 ProtocolEncoderOutput out = (ProtocolEncoderOutput) session.getAttribute(ENCODER_OUT);
538
539 if (out == null) {
540
541 out = new ProtocolEncoderOutputImpl(session, nextFilter, writeRequest);
542 session.setAttribute(ENCODER_OUT, out);
543 }
544
545 return out;
546 }
547
548
549
550
551 private void disposeDecoderOut(IoSession session) {
552 session.removeAttribute(DECODER_OUT);
553 }
554 }