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

Java Source Code / Java Documentation
1. 6.0 JDK Core
2. 6.0 JDK Modules
3. 6.0 JDK Modules com.sun
4. 6.0 JDK Modules com.sun.java
5. 6.0 JDK Modules sun
6. 6.0 JDK Platform
7. Ajax
8. Apache Harmony Java SE
9. Aspect oriented
10. Authentication Authorization
11. Blogger System
12. Build
13. Byte Code
14. Cache
15. Chart
16. Chat
17. Code Analyzer
18. Collaboration
19. Content Management System
20. Database Client
21. Database DBMS
22. Database JDBC Connection Pool
23. Database ORM
24. Development
25. EJB Server geronimo
26. EJB Server GlassFish
27. EJB Server JBoss 4.2.1
28. EJB Server resin 3.1.5
29. ERP CRM Financial
30. ESB
31. Forum
32. GIS
33. Graphic Library
34. Groupware
35. HTML Parser
36. IDE
37. IDE Eclipse
38. IDE Netbeans
39. Installer
40. Internationalization Localization
41. Inversion of Control
42. Issue Tracking
43. J2EE
44. JBoss
45. JMS
46. JMX
47. Library
48. Mail Clients
49. Net
50. Parser
51. PDF
52. Portal
53. Profiler
54. Project Management
55. Report
56. RSS RDF
57. Rule Engine
58. Science
59. Scripting
60. Search Engine
61. Security
62. Sevlet Container
63. Source Control
64. Swing Library
65. Template Engine
66. Test Coverage
67. Testing
68. UML
69. Web Crawler
70. Web Framework
71. Web Mail
72. Web Server
73. Web Services
74. Web Services apache cxf 2.0.1
75. Web Services AXIS2
76. Wiki Engine
77. Workflow Engines
78. XML
79. XML UI
Java
Java Tutorial
Java Open Source
Jar File Download
Java Articles
Java Products
Java by API
Photoshop Tutorials
Maya Tutorials
Flash Tutorials
3ds-Max Tutorials
Illustrator Tutorials
GIMP Tutorials
C# / C Sharp
C# / CSharp Tutorial
C# / CSharp Open Source
ASP.Net
ASP.NET Tutorial
JavaScript DHTML
JavaScript Tutorial
JavaScript Reference
HTML / CSS
HTML CSS Reference
C / ANSI-C
C Tutorial
C++
C++ Tutorial
Ruby
PHP
Python
Python Tutorial
Python Open Source
SQL Server / T-SQL
SQL Server / T-SQL Tutorial
Oracle PL / SQL
Oracle PL/SQL Tutorial
PostgreSQL
SQL / MySQL
MySQL Tutorial
VB.Net
VB.Net Tutorial
Flash / Flex / ActionScript
VBA / Excel / Access / Word
XML
XML Tutorial
Microsoft Office PowerPoint 2007 Tutorial
Microsoft Office Excel 2007 Tutorial
Microsoft Office Word 2007 Tutorial
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/BufferingHttpClientHandler.java $
003:         * $Revision: 613298 $
004:         * $Date: 2008-01-18 23:09:22 +0100 (Fri, 18 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:
037:        import org.apache.http.ConnectionReuseStrategy;
038:        import org.apache.http.HttpEntity;
039:        import org.apache.http.HttpEntityEnclosingRequest;
040:        import org.apache.http.HttpException;
041:        import org.apache.http.HttpRequest;
042:        import org.apache.http.HttpResponse;
043:        import org.apache.http.HttpStatus;
044:        import org.apache.http.nio.ContentDecoder;
045:        import org.apache.http.nio.ContentEncoder;
046:        import org.apache.http.nio.NHttpClientConnection;
047:        import org.apache.http.nio.entity.ContentBufferEntity;
048:        import org.apache.http.nio.entity.ContentOutputStream;
049:        import org.apache.http.nio.util.ByteBufferAllocator;
050:        import org.apache.http.nio.util.ContentInputBuffer;
051:        import org.apache.http.nio.util.ContentOutputBuffer;
052:        import org.apache.http.nio.util.HeapByteBufferAllocator;
053:        import org.apache.http.nio.util.SimpleInputBuffer;
054:        import org.apache.http.nio.util.SimpleOutputBuffer;
055:        import org.apache.http.params.HttpParams;
056:        import org.apache.http.params.CoreProtocolPNames;
057:        import org.apache.http.params.DefaultedHttpParams;
058:        import org.apache.http.protocol.ExecutionContext;
059:        import org.apache.http.protocol.HttpContext;
060:        import org.apache.http.protocol.HttpProcessor;
061:
062:        /**
063:         * HTTP client handler implementation that buffers the content of HTTP messages 
064:         * entirely in memory and executes HTTP requests on the main I/O thread.
065:         * 
066:         * <p>This service handler should be used only when dealing with HTTP messages 
067:         * that are known to be limited in length</p>
068:         * 
069:         * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
070:         *
071:         */
072:        public class BufferingHttpClientHandler extends NHttpClientHandlerBase {
073:
074:            public BufferingHttpClientHandler(
075:                    final HttpProcessor httpProcessor,
076:                    final HttpRequestExecutionHandler execHandler,
077:                    final ConnectionReuseStrategy connStrategy,
078:                    final ByteBufferAllocator allocator, final HttpParams params) {
079:                super (httpProcessor, execHandler, connStrategy, allocator,
080:                        params);
081:            }
082:
083:            public BufferingHttpClientHandler(
084:                    final HttpProcessor httpProcessor,
085:                    final HttpRequestExecutionHandler execHandler,
086:                    final ConnectionReuseStrategy connStrategy,
087:                    final HttpParams params) {
088:                this (httpProcessor, execHandler, connStrategy,
089:                        new HeapByteBufferAllocator(), params);
090:            }
091:
092:            public void connected(final NHttpClientConnection conn,
093:                    final Object attachment) {
094:                HttpContext context = conn.getContext();
095:
096:                initialize(conn, attachment);
097:
098:                ClientConnState connState = new ClientConnState(allocator);
099:                context.setAttribute(CONN_STATE, connState);
100:
101:                if (this .eventListener != null) {
102:                    this .eventListener.connectionOpen(conn);
103:                }
104:
105:                requestReady(conn);
106:            }
107:
108:            @Override
109:            public void closed(final NHttpClientConnection conn) {
110:                HttpContext context = conn.getContext();
111:
112:                this .execHandler.finalizeContext(context);
113:
114:                // TODO - replace with super.closed(conn); ?
115:                if (this .eventListener != null) {
116:                    this .eventListener.connectionClosed(conn);
117:                }
118:            }
119:
120:            public void requestReady(final NHttpClientConnection conn) {
121:                HttpContext context = conn.getContext();
122:
123:                ClientConnState connState = (ClientConnState) context
124:                        .getAttribute(CONN_STATE);
125:                if (connState.getOutputState() != ClientConnState.READY) {
126:                    return;
127:                }
128:
129:                try {
130:
131:                    HttpRequest request = this .execHandler
132:                            .submitRequest(context);
133:                    if (request == null) {
134:                        return;
135:                    }
136:
137:                    request.setParams(new DefaultedHttpParams(request
138:                            .getParams(), this .params));
139:
140:                    context
141:                            .setAttribute(ExecutionContext.HTTP_REQUEST,
142:                                    request);
143:                    this .httpProcessor.process(request, context);
144:                    connState.setRequest(request);
145:                    conn.submitRequest(request);
146:                    connState.setOutputState(ClientConnState.REQUEST_SENT);
147:
148:                    if (request instanceof  HttpEntityEnclosingRequest) {
149:                        if (((HttpEntityEnclosingRequest) request)
150:                                .expectContinue()) {
151:                            int timeout = conn.getSocketTimeout();
152:                            connState.setTimeout(timeout);
153:                            timeout = this .params.getIntParameter(
154:                                    CoreProtocolPNames.WAIT_FOR_CONTINUE, 3000);
155:                            conn.setSocketTimeout(timeout);
156:                            connState
157:                                    .setOutputState(ClientConnState.EXPECT_CONTINUE);
158:                        } else {
159:                            prepareRequestBody(
160:                                    (HttpEntityEnclosingRequest) request,
161:                                    connState);
162:                        }
163:                    }
164:
165:                } catch (IOException ex) {
166:                    shutdownConnection(conn, ex);
167:                    if (this .eventListener != null) {
168:                        this .eventListener.fatalIOException(ex, conn);
169:                    }
170:                } catch (HttpException ex) {
171:                    closeConnection(conn, ex);
172:                    if (this .eventListener != null) {
173:                        this .eventListener.fatalProtocolException(ex, conn);
174:                    }
175:                }
176:            }
177:
178:            public void inputReady(final NHttpClientConnection conn,
179:                    final ContentDecoder decoder) {
180:                HttpContext context = conn.getContext();
181:
182:                ClientConnState connState = (ClientConnState) context
183:                        .getAttribute(CONN_STATE);
184:                ContentInputBuffer buffer = connState.getInbuffer();
185:
186:                try {
187:
188:                    buffer.consumeContent(decoder);
189:                    if (decoder.isCompleted()) {
190:                        connState
191:                                .setInputState(ClientConnState.RESPONSE_BODY_DONE);
192:                        processResponse(conn, connState);
193:                    } else {
194:                        connState
195:                                .setInputState(ClientConnState.RESPONSE_BODY_STREAM);
196:                    }
197:
198:                } catch (IOException ex) {
199:                    shutdownConnection(conn, ex);
200:                    if (this .eventListener != null) {
201:                        this .eventListener.fatalIOException(ex, conn);
202:                    }
203:                } catch (HttpException ex) {
204:                    closeConnection(conn, ex);
205:                    if (this .eventListener != null) {
206:                        this .eventListener.fatalProtocolException(ex, conn);
207:                    }
208:                }
209:            }
210:
211:            public void outputReady(final NHttpClientConnection conn,
212:                    final ContentEncoder encoder) {
213:                HttpContext context = conn.getContext();
214:
215:                ClientConnState connState = (ClientConnState) context
216:                        .getAttribute(CONN_STATE);
217:                ContentOutputBuffer buffer = connState.getOutbuffer();
218:
219:                try {
220:
221:                    if (connState.getOutputState() == ClientConnState.EXPECT_CONTINUE) {
222:                        conn.suspendOutput();
223:                        return;
224:                    }
225:
226:                    buffer.produceContent(encoder);
227:                    if (encoder.isCompleted()) {
228:                        connState
229:                                .setInputState(ClientConnState.REQUEST_BODY_DONE);
230:                    } else {
231:                        connState
232:                                .setInputState(ClientConnState.REQUEST_BODY_STREAM);
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:                HttpResponse response = conn.getHttpResponse();
249:                response.setParams(new DefaultedHttpParams(
250:                        response.getParams(), this .params));
251:
252:                HttpRequest request = connState.getRequest();
253:
254:                try {
255:
256:                    int statusCode = response.getStatusLine().getStatusCode();
257:                    if (statusCode < HttpStatus.SC_OK) {
258:                        // 1xx intermediate response
259:                        if (statusCode == HttpStatus.SC_CONTINUE
260:                                && connState.getOutputState() == ClientConnState.EXPECT_CONTINUE) {
261:                            continueRequest(conn, connState);
262:                        }
263:                        return;
264:                    } else {
265:                        connState.setResponse(response);
266:                        connState
267:                                .setInputState(ClientConnState.RESPONSE_RECEIVED);
268:
269:                        if (connState.getOutputState() == ClientConnState.EXPECT_CONTINUE) {
270:                            cancelRequest(conn, connState);
271:                        }
272:                    }
273:                    if (!canResponseHaveBody(request, response)) {
274:                        conn.resetInput();
275:                        response.setEntity(null);
276:                        processResponse(conn, connState);
277:                    }
278:
279:                } catch (IOException ex) {
280:                    shutdownConnection(conn, ex);
281:                    if (this .eventListener != null) {
282:                        this .eventListener.fatalIOException(ex, conn);
283:                    }
284:                } catch (HttpException ex) {
285:                    closeConnection(conn, ex);
286:                    if (this .eventListener != null) {
287:                        this .eventListener.fatalProtocolException(ex, conn);
288:                    }
289:                }
290:            }
291:
292:            public void timeout(final NHttpClientConnection conn) {
293:                HttpContext context = conn.getContext();
294:                ClientConnState connState = (ClientConnState) context
295:                        .getAttribute(CONN_STATE);
296:
297:                try {
298:
299:                    if (connState.getOutputState() == ClientConnState.EXPECT_CONTINUE) {
300:                        continueRequest(conn, connState);
301:                        return;
302:                    }
303:
304:                } catch (IOException ex) {
305:                    shutdownConnection(conn, ex);
306:                    if (this .eventListener != null) {
307:                        this .eventListener.fatalIOException(ex, conn);
308:                    }
309:                }
310:
311:                handleTimeout(conn);
312:            }
313:
314:            private void initialize(final NHttpClientConnection conn,
315:                    final Object attachment) {
316:                HttpContext context = conn.getContext();
317:
318:                context.setAttribute(ExecutionContext.HTTP_CONNECTION, conn);
319:                this .execHandler.initalizeContext(context, attachment);
320:            }
321:
322:            private void continueRequest(final NHttpClientConnection conn,
323:                    final ClientConnState connState) throws IOException {
324:
325:                HttpRequest request = connState.getRequest();
326:
327:                int timeout = connState.getTimeout();
328:                conn.setSocketTimeout(timeout);
329:
330:                prepareRequestBody((HttpEntityEnclosingRequest) request,
331:                        connState);
332:                conn.requestOutput();
333:                connState.setOutputState(ClientConnState.REQUEST_SENT);
334:            }
335:
336:            private void cancelRequest(final NHttpClientConnection conn,
337:                    final ClientConnState connState) throws IOException {
338:
339:                int timeout = connState.getTimeout();
340:                conn.setSocketTimeout(timeout);
341:
342:                conn.resetOutput();
343:                connState.resetOutput();
344:            }
345:
346:            private void prepareRequestBody(
347:                    final HttpEntityEnclosingRequest request,
348:                    final ClientConnState connState) throws IOException {
349:                HttpEntity entity = request.getEntity();
350:                if (entity != null) {
351:                    OutputStream outstream = new ContentOutputStream(connState
352:                            .getOutbuffer());
353:                    entity.writeTo(outstream);
354:                    outstream.flush();
355:                    outstream.close();
356:                }
357:            }
358:
359:            private void processResponse(final NHttpClientConnection conn,
360:                    final ClientConnState connState) throws IOException,
361:                    HttpException {
362:
363:                HttpContext context = conn.getContext();
364:                HttpResponse response = connState.getResponse();
365:
366:                if (response.getEntity() != null) {
367:                    response.setEntity(new ContentBufferEntity(response
368:                            .getEntity(), connState.getInbuffer()));
369:                }
370:
371:                context.setAttribute(ExecutionContext.HTTP_RESPONSE, response);
372:
373:                this .httpProcessor.process(response, context);
374:
375:                this .execHandler.handleResponse(response, context);
376:
377:                if (!this .connStrategy.keepAlive(response, context)) {
378:                    conn.close();
379:                } else {
380:                    // Ready for another request
381:                    connState.resetInput();
382:                    connState.resetOutput();
383:                    conn.requestOutput();
384:                }
385:            }
386:
387:            static class ClientConnState {
388:
389:                public static final int READY = 0;
390:                public static final int REQUEST_SENT = 1;
391:                public static final int EXPECT_CONTINUE = 2;
392:                public static final int REQUEST_BODY_STREAM = 4;
393:                public static final int REQUEST_BODY_DONE = 8;
394:                public static final int RESPONSE_RECEIVED = 16;
395:                public static final int RESPONSE_BODY_STREAM = 32;
396:                public static final int RESPONSE_BODY_DONE = 64;
397:
398:                private SimpleInputBuffer inbuffer;
399:                private ContentOutputBuffer outbuffer;
400:
401:                private int inputState;
402:                private int outputState;
403:
404:                private HttpRequest request;
405:                private HttpResponse response;
406:
407:                private int timeout;
408:                private final ByteBufferAllocator allocator;
409:
410:                public ClientConnState(final ByteBufferAllocator allocator) {
411:                    super ();
412:                    this .allocator = allocator;
413:                }
414:
415:                public ContentInputBuffer getInbuffer() {
416:                    if (this .inbuffer == null) {
417:                        this .inbuffer = new SimpleInputBuffer(2048, allocator);
418:                    }
419:                    return this .inbuffer;
420:                }
421:
422:                public ContentOutputBuffer getOutbuffer() {
423:                    if (this .outbuffer == null) {
424:                        this .outbuffer = new SimpleOutputBuffer(2048, allocator);
425:                    }
426:                    return this .outbuffer;
427:                }
428:
429:                public int getInputState() {
430:                    return this .inputState;
431:                }
432:
433:                public void setInputState(int inputState) {
434:                    this .inputState = inputState;
435:                }
436:
437:                public int getOutputState() {
438:                    return this .outputState;
439:                }
440:
441:                public void setOutputState(int outputState) {
442:                    this .outputState = outputState;
443:                }
444:
445:                public HttpRequest getRequest() {
446:                    return this .request;
447:                }
448:
449:                public void setRequest(final HttpRequest request) {
450:                    this .request = request;
451:                }
452:
453:                public HttpResponse getResponse() {
454:                    return this .response;
455:                }
456:
457:                public void setResponse(final HttpResponse response) {
458:                    this .response = response;
459:                }
460:
461:                public int getTimeout() {
462:                    return this .timeout;
463:                }
464:
465:                public void setTimeout(int timeout) {
466:                    this .timeout = timeout;
467:                }
468:
469:                public void resetInput() {
470:                    this .inbuffer = null;
471:                    this .response = null;
472:                    this .inputState = READY;
473:                }
474:
475:                public void resetOutput() {
476:                    this.outbuffer = null;
477:                    this.request = null;
478:                    this.outputState = READY;
479:                }
480:            }
481:
482:        }
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.