Source Code Cross Referenced for ThrottlingHttpClientHandler.java in  » Net » httpcomponents-core-4.0-beta1 » org » apache » http » nio » protocol » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » httpcomponents core 4.0 beta1 » org.apache.http.nio.protocol 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $HeadURL: https://svn.apache.org/repos/asf/httpcomponents/httpcore/tags/4.0-beta1/module-nio/src/main/java/org/apache/http/nio/protocol/ThrottlingHttpClientHandler.java $
003:         * $Revision: 612997 $
004:         * $Date: 2008-01-17 23:42:36 +0100 (Thu, 17 Jan 2008) $
005:         *
006:         * ====================================================================
007:         * Licensed to the Apache Software Foundation (ASF) under one
008:         * or more contributor license agreements.  See the NOTICE file
009:         * distributed with this work for additional information
010:         * regarding copyright ownership.  The ASF licenses this file
011:         * to you under the Apache License, Version 2.0 (the
012:         * "License"); you may not use this file except in compliance
013:         * with the License.  You may obtain a copy of the License at
014:         *
015:         *   http://www.apache.org/licenses/LICENSE-2.0
016:         *
017:         * Unless required by applicable law or agreed to in writing,
018:         * software distributed under the License is distributed on an
019:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
020:         * KIND, either express or implied.  See the License for the
021:         * specific language governing permissions and limitations
022:         * under the License.
023:         * ====================================================================
024:         *
025:         * This software consists of voluntary contributions made by many
026:         * individuals on behalf of the Apache Software Foundation.  For more
027:         * information on the Apache Software Foundation, please see
028:         * <http://www.apache.org/>.
029:         *
030:         */
031:
032:        package org.apache.http.nio.protocol;
033:
034:        import java.io.IOException;
035:        import java.io.OutputStream;
036:        import java.util.concurrent.Executor;
037:
038:        import org.apache.http.ConnectionReuseStrategy;
039:        import org.apache.http.HttpEntity;
040:        import org.apache.http.HttpEntityEnclosingRequest;
041:        import org.apache.http.HttpException;
042:        import org.apache.http.HttpRequest;
043:        import org.apache.http.HttpResponse;
044:        import org.apache.http.HttpStatus;
045:        import org.apache.http.nio.ContentDecoder;
046:        import org.apache.http.nio.ContentEncoder;
047:        import org.apache.http.nio.IOControl;
048:        import org.apache.http.nio.NHttpClientConnection;
049:        import org.apache.http.nio.NHttpConnection;
050:        import org.apache.http.nio.entity.ContentBufferEntity;
051:        import org.apache.http.nio.entity.ContentOutputStream;
052:        import org.apache.http.nio.params.NIOReactorPNames;
053:        import org.apache.http.nio.protocol.ThrottlingHttpServiceHandler.ServerConnState;
054:        import org.apache.http.nio.util.ByteBufferAllocator;
055:        import org.apache.http.nio.util.ContentInputBuffer;
056:        import org.apache.http.nio.util.ContentOutputBuffer;
057:        import org.apache.http.nio.util.DirectByteBufferAllocator;
058:        import org.apache.http.nio.util.SharedInputBuffer;
059:        import org.apache.http.nio.util.SharedOutputBuffer;
060:        import org.apache.http.params.HttpParams;
061:        import org.apache.http.params.CoreProtocolPNames;
062:        import org.apache.http.params.DefaultedHttpParams;
063:        import org.apache.http.protocol.ExecutionContext;
064:        import org.apache.http.protocol.HttpContext;
065:        import org.apache.http.protocol.HttpProcessor;
066:
067:        /**
068:         * HTTP client handler implementation that allocates content buffers of limited 
069:         * size upon initialization and is capable of controlling the frequency of I/O 
070:         * events in order to guarantee those content buffers do not ever get overflown. 
071:         * This helps ensure near constant memory footprint of HTTP connections and to 
072:         * avoid the 'out of memory' condition while streaming out response content.
073:         * 
074:         * <p>The client handler will delegate the tasks of sending entity enclosing 
075:         * HTTP requests and processing of HTTP responses to an {@link Executor}, 
076:         * which is expected to perform those tasks using dedicated worker threads in 
077:         * order to avoid blocking the I/O thread.</p>
078:         * 
079:         * @see NIOReactorPNames#CONTENT_BUFFER_SIZE
080:         * 
081:         * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
082:         *
083:         */
084:        public class ThrottlingHttpClientHandler extends NHttpClientHandlerBase {
085:
086:            protected final Executor executor;
087:
088:            public ThrottlingHttpClientHandler(
089:                    final HttpProcessor httpProcessor,
090:                    final HttpRequestExecutionHandler execHandler,
091:                    final ConnectionReuseStrategy connStrategy,
092:                    final ByteBufferAllocator allocator,
093:                    final Executor executor, final HttpParams params) {
094:                super (httpProcessor, execHandler, connStrategy, allocator,
095:                        params);
096:                if (executor == null) {
097:                    throw new IllegalArgumentException(
098:                            "Executor may not be null");
099:                }
100:                this .executor = executor;
101:            }
102:
103:            public ThrottlingHttpClientHandler(
104:                    final HttpProcessor httpProcessor,
105:                    final HttpRequestExecutionHandler execHandler,
106:                    final ConnectionReuseStrategy connStrategy,
107:                    final Executor executor, final HttpParams params) {
108:                this (httpProcessor, execHandler, connStrategy,
109:                        new DirectByteBufferAllocator(), executor, params);
110:            }
111:
112:            public void connected(final NHttpClientConnection conn,
113:                    final Object attachment) {
114:                HttpContext context = conn.getContext();
115:
116:                initialize(conn, attachment);
117:
118:                int bufsize = this .params.getIntParameter(
119:                        NIOReactorPNames.CONTENT_BUFFER_SIZE, 20480);
120:                ClientConnState connState = new ClientConnState(bufsize, conn,
121:                        this .allocator);
122:                context.setAttribute(CONN_STATE, connState);
123:
124:                if (this .eventListener != null) {
125:                    this .eventListener.connectionOpen(conn);
126:                }
127:
128:                requestReady(conn);
129:            }
130:
131:            @Override
132:            public void closed(final NHttpClientConnection conn) {
133:                HttpContext context = conn.getContext();
134:
135:                this .execHandler.finalizeContext(context);
136:
137:                // TODO - replace with super.closed(conn); ?
138:                if (this .eventListener != null) {
139:                    this .eventListener.connectionClosed(conn);
140:                }
141:            }
142:
143:            public void requestReady(final NHttpClientConnection conn) {
144:                HttpContext context = conn.getContext();
145:
146:                ClientConnState connState = (ClientConnState) context
147:                        .getAttribute(CONN_STATE);
148:
149:                try {
150:
151:                    synchronized (connState) {
152:                        if (connState.getOutputState() != ClientConnState.READY) {
153:                            return;
154:                        }
155:
156:                        HttpRequest request = this .execHandler
157:                                .submitRequest(context);
158:                        if (request == null) {
159:                            return;
160:                        }
161:
162:                        request.setParams(new DefaultedHttpParams(request
163:                                .getParams(), this .params));
164:
165:                        context.setAttribute(ExecutionContext.HTTP_REQUEST,
166:                                request);
167:                        this .httpProcessor.process(request, context);
168:                        connState.setRequest(request);
169:                        conn.submitRequest(request);
170:                        connState.setOutputState(ClientConnState.REQUEST_SENT);
171:
172:                        conn.requestInput();
173:
174:                        if (request instanceof  HttpEntityEnclosingRequest) {
175:                            if (((HttpEntityEnclosingRequest) request)
176:                                    .expectContinue()) {
177:                                int timeout = conn.getSocketTimeout();
178:                                connState.setTimeout(timeout);
179:                                timeout = this .params.getIntParameter(
180:                                        CoreProtocolPNames.WAIT_FOR_CONTINUE,
181:                                        3000);
182:                                conn.setSocketTimeout(timeout);
183:                                connState
184:                                        .setOutputState(ClientConnState.EXPECT_CONTINUE);
185:                            } else {
186:                                sendRequestBody(
187:                                        (HttpEntityEnclosingRequest) request,
188:                                        connState, conn);
189:                            }
190:                        }
191:
192:                        connState.notifyAll();
193:                    }
194:
195:                } catch (IOException ex) {
196:                    shutdownConnection(conn, ex);
197:                    if (this .eventListener != null) {
198:                        this .eventListener.fatalIOException(ex, conn);
199:                    }
200:                } catch (HttpException ex) {
201:                    closeConnection(conn, ex);
202:                    if (this .eventListener != null) {
203:                        this .eventListener.fatalProtocolException(ex, conn);
204:                    }
205:                }
206:            }
207:
208:            public void outputReady(final NHttpClientConnection conn,
209:                    final ContentEncoder encoder) {
210:                HttpContext context = conn.getContext();
211:
212:                ClientConnState connState = (ClientConnState) context
213:                        .getAttribute(CONN_STATE);
214:
215:                try {
216:
217:                    synchronized (connState) {
218:                        if (connState.getOutputState() == ClientConnState.EXPECT_CONTINUE) {
219:                            conn.suspendOutput();
220:                            return;
221:                        }
222:                        ContentOutputBuffer buffer = connState.getOutbuffer();
223:                        buffer.produceContent(encoder);
224:                        if (encoder.isCompleted()) {
225:                            connState
226:                                    .setInputState(ClientConnState.REQUEST_BODY_DONE);
227:                        } else {
228:                            connState
229:                                    .setInputState(ClientConnState.REQUEST_BODY_STREAM);
230:                        }
231:
232:                        connState.notifyAll();
233:                    }
234:
235:                } catch (IOException ex) {
236:                    shutdownConnection(conn, ex);
237:                    if (this .eventListener != null) {
238:                        this .eventListener.fatalIOException(ex, conn);
239:                    }
240:                }
241:            }
242:
243:            public void responseReceived(final NHttpClientConnection conn) {
244:                HttpContext context = conn.getContext();
245:                ClientConnState connState = (ClientConnState) context
246:                        .getAttribute(CONN_STATE);
247:
248:                try {
249:
250:                    synchronized (connState) {
251:                        HttpResponse response = conn.getHttpResponse();
252:                        response.setParams(new DefaultedHttpParams(response
253:                                .getParams(), this .params));
254:
255:                        HttpRequest request = connState.getRequest();
256:
257:                        int statusCode = response.getStatusLine()
258:                                .getStatusCode();
259:                        if (statusCode < HttpStatus.SC_OK) {
260:                            // 1xx intermediate response
261:                            if (statusCode == HttpStatus.SC_CONTINUE
262:                                    && connState.getOutputState() == ClientConnState.EXPECT_CONTINUE) {
263:                                connState
264:                                        .setOutputState(ClientConnState.REQUEST_SENT);
265:                                continueRequest(conn, connState);
266:                            }
267:                            return;
268:                        } else {
269:                            connState.setResponse(response);
270:                            connState
271:                                    .setInputState(ClientConnState.RESPONSE_RECEIVED);
272:
273:                            if (connState.getOutputState() == ClientConnState.EXPECT_CONTINUE) {
274:                                int timeout = connState.getTimeout();
275:                                conn.setSocketTimeout(timeout);
276:                                conn.resetOutput();
277:                            }
278:                        }
279:
280:                        if (!canResponseHaveBody(request, response)) {
281:                            conn.resetInput();
282:                            response.setEntity(null);
283:                            connState
284:                                    .setInputState(ClientConnState.RESPONSE_DONE);
285:
286:                            if (!this .connStrategy.keepAlive(response, context)) {
287:                                conn.close();
288:                            }
289:                        }
290:
291:                        if (response.getEntity() != null) {
292:                            response.setEntity(new ContentBufferEntity(response
293:                                    .getEntity(), connState.getInbuffer()));
294:                        }
295:
296:                        context.setAttribute(ExecutionContext.HTTP_RESPONSE,
297:                                response);
298:
299:                        this .httpProcessor.process(response, context);
300:
301:                        handleResponse(response, connState, conn);
302:
303:                        connState.notifyAll();
304:                    }
305:
306:                } catch (IOException ex) {
307:                    shutdownConnection(conn, ex);
308:                    if (this .eventListener != null) {
309:                        this .eventListener.fatalIOException(ex, conn);
310:                    }
311:                } catch (HttpException ex) {
312:                    closeConnection(conn, ex);
313:                    if (this .eventListener != null) {
314:                        this .eventListener.fatalProtocolException(ex, conn);
315:                    }
316:                }
317:            }
318:
319:            public void inputReady(final NHttpClientConnection conn,
320:                    final ContentDecoder decoder) {
321:                HttpContext context = conn.getContext();
322:
323:                ClientConnState connState = (ClientConnState) context
324:                        .getAttribute(CONN_STATE);
325:                try {
326:
327:                    synchronized (connState) {
328:                        HttpResponse response = connState.getResponse();
329:                        ContentInputBuffer buffer = connState.getInbuffer();
330:
331:                        buffer.consumeContent(decoder);
332:                        if (decoder.isCompleted()) {
333:                            connState
334:                                    .setInputState(ClientConnState.RESPONSE_BODY_DONE);
335:
336:                            if (!this .connStrategy.keepAlive(response, context)) {
337:                                conn.close();
338:                            }
339:                        } else {
340:                            connState
341:                                    .setInputState(ClientConnState.RESPONSE_BODY_STREAM);
342:                        }
343:
344:                        connState.notifyAll();
345:                    }
346:
347:                } catch (IOException ex) {
348:                    shutdownConnection(conn, ex);
349:                    if (this .eventListener != null) {
350:                        this .eventListener.fatalIOException(ex, conn);
351:                    }
352:                }
353:            }
354:
355:            public void timeout(final NHttpClientConnection conn) {
356:                HttpContext context = conn.getContext();
357:                ClientConnState connState = (ClientConnState) context
358:                        .getAttribute(CONN_STATE);
359:
360:                try {
361:
362:                    synchronized (connState) {
363:                        if (connState.getOutputState() == ClientConnState.EXPECT_CONTINUE) {
364:                            connState
365:                                    .setOutputState(ClientConnState.REQUEST_SENT);
366:                            continueRequest(conn, connState);
367:
368:                            connState.notifyAll();
369:                            return;
370:                        }
371:                    }
372:
373:                } catch (IOException ex) {
374:                    shutdownConnection(conn, ex);
375:                    if (this .eventListener != null) {
376:                        this .eventListener.fatalIOException(ex, conn);
377:                    }
378:                }
379:
380:                handleTimeout(conn);
381:            }
382:
383:            private void initialize(final NHttpClientConnection conn,
384:                    final Object attachment) {
385:                HttpContext context = conn.getContext();
386:
387:                context.setAttribute(ExecutionContext.HTTP_CONNECTION, conn);
388:                this .execHandler.initalizeContext(context, attachment);
389:            }
390:
391:            private void continueRequest(final NHttpClientConnection conn,
392:                    final ClientConnState connState) throws IOException {
393:
394:                HttpRequest request = connState.getRequest();
395:
396:                int timeout = connState.getTimeout();
397:                conn.setSocketTimeout(timeout);
398:
399:                sendRequestBody((HttpEntityEnclosingRequest) request,
400:                        connState, conn);
401:            }
402:
403:            private void sendRequestBody(
404:                    final HttpEntityEnclosingRequest request,
405:                    final ClientConnState connState,
406:                    final NHttpClientConnection conn) throws IOException {
407:                HttpEntity entity = request.getEntity();
408:                if (entity != null) {
409:
410:                    this .executor.execute(new Runnable() {
411:
412:                        public void run() {
413:                            try {
414:
415:                                // Block until previous request is fully processed and 
416:                                // the worker thread no longer holds the shared buffer
417:                                synchronized (connState) {
418:                                    try {
419:                                        for (;;) {
420:                                            int currentState = connState
421:                                                    .getOutputState();
422:                                            if (!connState.isWorkerRunning()) {
423:                                                break;
424:                                            }
425:                                            if (currentState == ServerConnState.SHUTDOWN) {
426:                                                return;
427:                                            }
428:                                            connState.wait();
429:                                        }
430:                                    } catch (InterruptedException ex) {
431:                                        connState.shutdown();
432:                                        return;
433:                                    }
434:                                    connState.setWorkerRunning(true);
435:                                }
436:
437:                                HttpEntity entity = request.getEntity();
438:                                OutputStream outstream = new ContentOutputStream(
439:                                        connState.getOutbuffer());
440:                                entity.writeTo(outstream);
441:                                outstream.flush();
442:                                outstream.close();
443:
444:                                synchronized (connState) {
445:                                    connState.setWorkerRunning(false);
446:                                    connState.notifyAll();
447:                                }
448:
449:                            } catch (IOException ex) {
450:                                shutdownConnection(conn, ex);
451:                                if (eventListener != null) {
452:                                    eventListener.fatalIOException(ex, conn);
453:                                }
454:                            }
455:                        }
456:
457:                    });
458:                }
459:            }
460:
461:            private void handleResponse(final HttpResponse response,
462:                    final ClientConnState connState,
463:                    final NHttpClientConnection conn) {
464:
465:                final HttpContext context = conn.getContext();
466:
467:                this .executor.execute(new Runnable() {
468:
469:                    public void run() {
470:                        try {
471:
472:                            // Block until previous request is fully processed and 
473:                            // the worker thread no longer holds the shared buffer
474:                            synchronized (connState) {
475:                                try {
476:                                    for (;;) {
477:                                        int currentState = connState
478:                                                .getOutputState();
479:                                        if (!connState.isWorkerRunning()) {
480:                                            break;
481:                                        }
482:                                        if (currentState == ServerConnState.SHUTDOWN) {
483:                                            return;
484:                                        }
485:                                        connState.wait();
486:                                    }
487:                                } catch (InterruptedException ex) {
488:                                    connState.shutdown();
489:                                    return;
490:                                }
491:                                connState.setWorkerRunning(true);
492:                            }
493:
494:                            execHandler.handleResponse(response, context);
495:
496:                            synchronized (connState) {
497:
498:                                try {
499:                                    for (;;) {
500:                                        int currentState = connState
501:                                                .getInputState();
502:                                        if (currentState == ClientConnState.RESPONSE_DONE) {
503:                                            break;
504:                                        }
505:                                        if (currentState == ServerConnState.SHUTDOWN) {
506:                                            return;
507:                                        }
508:                                        connState.wait();
509:                                    }
510:                                } catch (InterruptedException ex) {
511:                                    connState.shutdown();
512:                                }
513:
514:                                connState.resetInput();
515:                                connState.resetOutput();
516:                                if (conn.isOpen()) {
517:                                    conn.requestOutput();
518:                                }
519:                                connState.setWorkerRunning(false);
520:                                connState.notifyAll();
521:                            }
522:
523:                        } catch (IOException ex) {
524:                            shutdownConnection(conn, ex);
525:                            if (eventListener != null) {
526:                                eventListener.fatalIOException(ex, conn);
527:                            }
528:                        }
529:                    }
530:
531:                });
532:
533:            }
534:
535:            protected void shutdownConnection(final NHttpConnection conn,
536:                    final Throwable cause) {
537:                HttpContext context = conn.getContext();
538:
539:                ClientConnState connState = (ClientConnState) context
540:                        .getAttribute(CONN_STATE);
541:
542:                super .shutdownConnection(conn, cause);
543:
544:                if (connState != null) {
545:                    connState.shutdown();
546:                }
547:            }
548:
549:            static class ClientConnState {
550:
551:                public static final int SHUTDOWN = -1;
552:                public static final int READY = 0;
553:                public static final int REQUEST_SENT = 1;
554:                public static final int EXPECT_CONTINUE = 2;
555:                public static final int REQUEST_BODY_STREAM = 4;
556:                public static final int REQUEST_BODY_DONE = 8;
557:                public static final int RESPONSE_RECEIVED = 16;
558:                public static final int RESPONSE_BODY_STREAM = 32;
559:                public static final int RESPONSE_BODY_DONE = 64;
560:                public static final int RESPONSE_DONE = 64;
561:
562:                private final SharedInputBuffer inbuffer;
563:                private final SharedOutputBuffer outbuffer;
564:
565:                private volatile int inputState;
566:                private volatile int outputState;
567:
568:                private volatile HttpRequest request;
569:                private volatile HttpResponse response;
570:
571:                private volatile int timeout;
572:
573:                private volatile boolean workerRunning;
574:
575:                public ClientConnState(int bufsize, final IOControl ioControl,
576:                        final ByteBufferAllocator allocator) {
577:                    super ();
578:                    this .inbuffer = new SharedInputBuffer(bufsize, ioControl,
579:                            allocator);
580:                    this .outbuffer = new SharedOutputBuffer(bufsize, ioControl,
581:                            allocator);
582:                    this .inputState = READY;
583:                    this .outputState = READY;
584:                }
585:
586:                public ContentInputBuffer getInbuffer() {
587:                    return this .inbuffer;
588:                }
589:
590:                public ContentOutputBuffer getOutbuffer() {
591:                    return this .outbuffer;
592:                }
593:
594:                public int getInputState() {
595:                    return this .inputState;
596:                }
597:
598:                public void setInputState(int inputState) {
599:                    this .inputState = inputState;
600:                }
601:
602:                public int getOutputState() {
603:                    return this .outputState;
604:                }
605:
606:                public void setOutputState(int outputState) {
607:                    this .outputState = outputState;
608:                }
609:
610:                public HttpRequest getRequest() {
611:                    return this .request;
612:                }
613:
614:                public void setRequest(final HttpRequest request) {
615:                    this .request = request;
616:                }
617:
618:                public HttpResponse getResponse() {
619:                    return this .response;
620:                }
621:
622:                public void setResponse(final HttpResponse response) {
623:                    this .response = response;
624:                }
625:
626:                public int getTimeout() {
627:                    return this .timeout;
628:                }
629:
630:                public void setTimeout(int timeout) {
631:                    this .timeout = timeout;
632:                }
633:
634:                public boolean isWorkerRunning() {
635:                    return this .workerRunning;
636:                }
637:
638:                public void setWorkerRunning(boolean b) {
639:                    this .workerRunning = b;
640:                }
641:
642:                public void shutdown() {
643:                    this .inbuffer.shutdown();
644:                    this .outbuffer.shutdown();
645:                    this .inputState = SHUTDOWN;
646:                    this .outputState = SHUTDOWN;
647:                }
648:
649:                public void resetInput() {
650:                    this .inbuffer.reset();
651:                    this .request = null;
652:                    this .inputState = READY;
653:                }
654:
655:                public void resetOutput() {
656:                    this.outbuffer.reset();
657:                    this.response = null;
658:                    this.outputState = READY;
659:                }
660:
661:            }
662:
663:        }
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