Source Code Cross Referenced for BufferingHttpServiceHandler.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/BufferingHttpServiceHandler.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.HttpResponseFactory;
044:        import org.apache.http.HttpStatus;
045:        import org.apache.http.HttpVersion;
046:        import org.apache.http.MethodNotSupportedException;
047:        import org.apache.http.ProtocolVersion;
048:        import org.apache.http.ProtocolException;
049:        import org.apache.http.UnsupportedHttpVersionException;
050:        import org.apache.http.entity.ByteArrayEntity;
051:        import org.apache.http.nio.ContentDecoder;
052:        import org.apache.http.nio.ContentEncoder;
053:        import org.apache.http.nio.NHttpServerConnection;
054:        import org.apache.http.nio.NHttpServiceHandler;
055:        import org.apache.http.nio.entity.ContentBufferEntity;
056:        import org.apache.http.nio.entity.ContentOutputStream;
057:        import org.apache.http.nio.util.ByteBufferAllocator;
058:        import org.apache.http.nio.util.ContentInputBuffer;
059:        import org.apache.http.nio.util.ContentOutputBuffer;
060:        import org.apache.http.nio.util.HeapByteBufferAllocator;
061:        import org.apache.http.nio.util.SimpleInputBuffer;
062:        import org.apache.http.nio.util.SimpleOutputBuffer;
063:        import org.apache.http.params.HttpParams;
064:        import org.apache.http.params.DefaultedHttpParams;
065:        import org.apache.http.protocol.HttpContext;
066:        import org.apache.http.protocol.ExecutionContext;
067:        import org.apache.http.protocol.HttpProcessor;
068:        import org.apache.http.protocol.HttpRequestHandler;
069:        import org.apache.http.util.EncodingUtils;
070:
071:        /**
072:         * HTTP service handler implementation that buffers the content of HTTP messages 
073:         * entirely in memory and processes HTTP requests on the main I/O thread.
074:         * 
075:         * <p>This service handler should be used only when dealing with HTTP messages 
076:         * that are known to be limited in length</p>
077:         * 
078:         * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
079:         *
080:         */
081:        public class BufferingHttpServiceHandler extends
082:                NHttpServiceHandlerBase implements  NHttpServiceHandler {
083:
084:            public BufferingHttpServiceHandler(
085:                    final HttpProcessor httpProcessor,
086:                    final HttpResponseFactory responseFactory,
087:                    final ConnectionReuseStrategy connStrategy,
088:                    final ByteBufferAllocator allocator, final HttpParams params) {
089:                super (httpProcessor, responseFactory, connStrategy, allocator,
090:                        params);
091:            }
092:
093:            public BufferingHttpServiceHandler(
094:                    final HttpProcessor httpProcessor,
095:                    final HttpResponseFactory responseFactory,
096:                    final ConnectionReuseStrategy connStrategy,
097:                    final HttpParams params) {
098:                this (httpProcessor, responseFactory, connStrategy,
099:                        new HeapByteBufferAllocator(), params);
100:            }
101:
102:            public void connected(final NHttpServerConnection conn) {
103:                HttpContext context = conn.getContext();
104:
105:                ServerConnState connState = new ServerConnState(allocator);
106:                context.setAttribute(CONN_STATE, connState);
107:
108:                if (this .eventListener != null) {
109:                    this .eventListener.connectionOpen(conn);
110:                }
111:            }
112:
113:            public void requestReceived(final NHttpServerConnection conn) {
114:                HttpContext context = conn.getContext();
115:
116:                HttpRequest request = conn.getHttpRequest();
117:                request.setParams(new DefaultedHttpParams(request.getParams(),
118:                        this .params));
119:
120:                ServerConnState connState = (ServerConnState) context
121:                        .getAttribute(CONN_STATE);
122:
123:                // Update connection state
124:                connState.resetInput();
125:                connState.setRequest(request);
126:                connState.setInputState(ServerConnState.REQUEST_RECEIVED);
127:
128:                ProtocolVersion ver = request.getRequestLine()
129:                        .getProtocolVersion();
130:                if (!ver.lessEquals(HttpVersion.HTTP_1_1)) {
131:                    // Downgrade protocol version if greater than HTTP/1.1 
132:                    ver = HttpVersion.HTTP_1_1;
133:                }
134:
135:                HttpResponse response;
136:
137:                try {
138:
139:                    if (request instanceof  HttpEntityEnclosingRequest) {
140:                        if (((HttpEntityEnclosingRequest) request)
141:                                .expectContinue()) {
142:                            response = this .responseFactory.newHttpResponse(
143:                                    ver, HttpStatus.SC_CONTINUE, context);
144:                            response.setParams(new DefaultedHttpParams(response
145:                                    .getParams(), this .params));
146:
147:                            if (this .expectationVerifier != null) {
148:                                try {
149:                                    this .expectationVerifier.verify(request,
150:                                            response, context);
151:                                } catch (HttpException ex) {
152:                                    response = this .responseFactory
153:                                            .newHttpResponse(
154:                                                    HttpVersion.HTTP_1_0,
155:                                                    HttpStatus.SC_INTERNAL_SERVER_ERROR,
156:                                                    context);
157:                                    response.setParams(new DefaultedHttpParams(
158:                                            response.getParams(), this .params));
159:                                    handleException(ex, response);
160:                                }
161:                            }
162:
163:                            if (response.getStatusLine().getStatusCode() < 200) {
164:                                // Send 1xx response indicating the server expections
165:                                // have been met
166:                                conn.submitResponse(response);
167:                            } else {
168:                                // The request does not meet the server expections
169:                                conn.resetInput();
170:                                connState.resetInput();
171:                                sendResponse(conn, response);
172:                            }
173:                        }
174:                        // Request content is expected. 
175:                        // Wait until the request content is fully received
176:                    } else {
177:                        // No request content is expected. 
178:                        // Process request right away
179:                        conn.suspendInput();
180:                        processRequest(conn, request);
181:                    }
182:
183:                } catch (IOException ex) {
184:                    shutdownConnection(conn, ex);
185:                    if (this .eventListener != null) {
186:                        this .eventListener.fatalIOException(ex, conn);
187:                    }
188:                } catch (HttpException ex) {
189:                    closeConnection(conn, ex);
190:                    if (this .eventListener != null) {
191:                        this .eventListener.fatalProtocolException(ex, conn);
192:                    }
193:                }
194:
195:            }
196:
197:            public void closed(final NHttpServerConnection conn) {
198:                if (this .eventListener != null) {
199:                    this .eventListener.connectionClosed(conn);
200:                }
201:            }
202:
203:            public void exception(final NHttpServerConnection conn,
204:                    final HttpException httpex) {
205:                if (conn.isResponseSubmitted()) {
206:                    if (eventListener != null) {
207:                        eventListener.fatalProtocolException(httpex, conn);
208:                    }
209:                    return;
210:                }
211:
212:                HttpContext context = conn.getContext();
213:                try {
214:                    HttpResponse response = this .responseFactory
215:                            .newHttpResponse(HttpVersion.HTTP_1_0,
216:                                    HttpStatus.SC_INTERNAL_SERVER_ERROR,
217:                                    context);
218:                    response.setParams(new DefaultedHttpParams(response
219:                            .getParams(), this .params));
220:                    handleException(httpex, response);
221:                    response.setEntity(null);
222:                    sendResponse(conn, response);
223:
224:                } catch (IOException ex) {
225:                    shutdownConnection(conn, ex);
226:                    if (this .eventListener != null) {
227:                        this .eventListener.fatalIOException(ex, conn);
228:                    }
229:                } catch (HttpException ex) {
230:                    closeConnection(conn, ex);
231:                    if (this .eventListener != null) {
232:                        this .eventListener.fatalProtocolException(ex, conn);
233:                    }
234:                }
235:            }
236:
237:            public void inputReady(final NHttpServerConnection conn,
238:                    final ContentDecoder decoder) {
239:                HttpContext context = conn.getContext();
240:                HttpRequest request = conn.getHttpRequest();
241:
242:                ServerConnState connState = (ServerConnState) context
243:                        .getAttribute(CONN_STATE);
244:                ContentInputBuffer buffer = connState.getInbuffer();
245:
246:                // Update connection state
247:                connState.setInputState(ServerConnState.REQUEST_BODY_STREAM);
248:
249:                try {
250:                    buffer.consumeContent(decoder);
251:                    if (decoder.isCompleted()) {
252:                        // Request entity has been fully received
253:                        connState
254:                                .setInputState(ServerConnState.REQUEST_BODY_DONE);
255:
256:                        // Create a wrapper entity instead of the original one
257:                        HttpEntityEnclosingRequest entityReq = (HttpEntityEnclosingRequest) request;
258:                        if (entityReq.getEntity() != null) {
259:                            entityReq.setEntity(new ContentBufferEntity(
260:                                    entityReq.getEntity(), connState
261:                                            .getInbuffer()));
262:                        }
263:                        conn.suspendInput();
264:                        processRequest(conn, request);
265:                    }
266:
267:                } catch (IOException ex) {
268:                    shutdownConnection(conn, ex);
269:                    if (this .eventListener != null) {
270:                        this .eventListener.fatalIOException(ex, conn);
271:                    }
272:                } catch (HttpException ex) {
273:                    closeConnection(conn, ex);
274:                    if (this .eventListener != null) {
275:                        this .eventListener.fatalProtocolException(ex, conn);
276:                    }
277:                }
278:            }
279:
280:            public void responseReady(final NHttpServerConnection conn) {
281:            }
282:
283:            public void outputReady(final NHttpServerConnection conn,
284:                    final ContentEncoder encoder) {
285:
286:                HttpContext context = conn.getContext();
287:                HttpResponse response = conn.getHttpResponse();
288:
289:                ServerConnState connState = (ServerConnState) context
290:                        .getAttribute(CONN_STATE);
291:                ContentOutputBuffer buffer = connState.getOutbuffer();
292:
293:                // Update connection state
294:                connState.setOutputState(ServerConnState.RESPONSE_BODY_STREAM);
295:
296:                try {
297:
298:                    buffer.produceContent(encoder);
299:                    if (encoder.isCompleted()) {
300:                        connState
301:                                .setOutputState(ServerConnState.RESPONSE_BODY_DONE);
302:                        connState.resetOutput();
303:                        if (!this .connStrategy.keepAlive(response, context)) {
304:                            conn.close();
305:                        } else {
306:                            conn.requestInput();
307:                        }
308:                    }
309:
310:                } catch (IOException ex) {
311:                    shutdownConnection(conn, ex);
312:                    if (this .eventListener != null) {
313:                        this .eventListener.fatalIOException(ex, conn);
314:                    }
315:                }
316:            }
317:
318:            private void handleException(final HttpException ex,
319:                    final HttpResponse response) {
320:                int code = HttpStatus.SC_INTERNAL_SERVER_ERROR;
321:                if (ex instanceof  MethodNotSupportedException) {
322:                    code = HttpStatus.SC_NOT_IMPLEMENTED;
323:                } else if (ex instanceof  UnsupportedHttpVersionException) {
324:                    code = HttpStatus.SC_HTTP_VERSION_NOT_SUPPORTED;
325:                } else if (ex instanceof  ProtocolException) {
326:                    code = HttpStatus.SC_BAD_REQUEST;
327:                }
328:                response.setStatusCode(code);
329:
330:                byte[] msg = EncodingUtils.getAsciiBytes(ex.getMessage());
331:                ByteArrayEntity entity = new ByteArrayEntity(msg);
332:                entity.setContentType("text/plain; charset=US-ASCII");
333:                response.setEntity(entity);
334:            }
335:
336:            private void processRequest(final NHttpServerConnection conn,
337:                    final HttpRequest request) throws IOException,
338:                    HttpException {
339:
340:                HttpContext context = conn.getContext();
341:                ProtocolVersion ver = request.getRequestLine()
342:                        .getProtocolVersion();
343:
344:                if (!ver.lessEquals(HttpVersion.HTTP_1_1)) {
345:                    // Downgrade protocol version if greater than HTTP/1.1 
346:                    ver = HttpVersion.HTTP_1_1;
347:                }
348:
349:                HttpResponse response = this .responseFactory.newHttpResponse(
350:                        ver, HttpStatus.SC_OK, conn.getContext());
351:                response.setParams(new DefaultedHttpParams(
352:                        response.getParams(), this .params));
353:
354:                context.setAttribute(ExecutionContext.HTTP_REQUEST, request);
355:                context.setAttribute(ExecutionContext.HTTP_CONNECTION, conn);
356:                context.setAttribute(ExecutionContext.HTTP_RESPONSE, response);
357:
358:                try {
359:
360:                    this .httpProcessor.process(request, context);
361:
362:                    HttpRequestHandler handler = null;
363:                    if (this .handlerResolver != null) {
364:                        String requestURI = request.getRequestLine().getUri();
365:                        handler = this .handlerResolver.lookup(requestURI);
366:                    }
367:                    if (handler != null) {
368:                        handler.handle(request, response, context);
369:                    } else {
370:                        response.setStatusCode(HttpStatus.SC_NOT_IMPLEMENTED);
371:                    }
372:
373:                } catch (HttpException ex) {
374:                    response = this .responseFactory.newHttpResponse(
375:                            HttpVersion.HTTP_1_0,
376:                            HttpStatus.SC_INTERNAL_SERVER_ERROR, context);
377:                    response.setParams(new DefaultedHttpParams(response
378:                            .getParams(), this .params));
379:                    handleException(ex, response);
380:                }
381:
382:                sendResponse(conn, response);
383:            }
384:
385:            private void sendResponse(final NHttpServerConnection conn,
386:                    final HttpResponse response) throws IOException,
387:                    HttpException {
388:
389:                HttpContext context = conn.getContext();
390:
391:                ServerConnState connState = (ServerConnState) context
392:                        .getAttribute(CONN_STATE);
393:                ContentOutputBuffer buffer = connState.getOutbuffer();
394:
395:                this .httpProcessor.process(response, context);
396:
397:                if (!canResponseHaveBody(connState.getRequest(), response)) {
398:                    response.setEntity(null);
399:                }
400:
401:                conn.submitResponse(response);
402:
403:                // Update connection state
404:                connState.setOutputState(ServerConnState.RESPONSE_SENT);
405:
406:                HttpEntity entity = response.getEntity();
407:                if (entity != null) {
408:                    OutputStream outstream = new ContentOutputStream(buffer);
409:                    entity.writeTo(outstream);
410:                    outstream.flush();
411:                    outstream.close();
412:                } else {
413:                    connState.resetOutput();
414:                    if (!this .connStrategy.keepAlive(response, context)) {
415:                        conn.close();
416:                    } else {
417:                        conn.requestInput();
418:                    }
419:                }
420:            }
421:
422:            static class ServerConnState {
423:
424:                public static final int READY = 0;
425:                public static final int REQUEST_RECEIVED = 1;
426:                public static final int REQUEST_BODY_STREAM = 2;
427:                public static final int REQUEST_BODY_DONE = 4;
428:                public static final int RESPONSE_SENT = 8;
429:                public static final int RESPONSE_BODY_STREAM = 16;
430:                public static final int RESPONSE_BODY_DONE = 32;
431:
432:                private SimpleInputBuffer inbuffer;
433:                private ContentOutputBuffer outbuffer;
434:
435:                private int inputState;
436:                private int outputState;
437:
438:                private HttpRequest request;
439:                private final ByteBufferAllocator allocator;
440:
441:                public ServerConnState(final ByteBufferAllocator allocator) {
442:                    super ();
443:                    this .inputState = READY;
444:                    this .outputState = READY;
445:                    this .allocator = allocator;
446:                }
447:
448:                public ContentInputBuffer getInbuffer() {
449:                    if (this .inbuffer == null) {
450:                        this .inbuffer = new SimpleInputBuffer(2048, allocator);
451:                    }
452:                    return this .inbuffer;
453:                }
454:
455:                public ContentOutputBuffer getOutbuffer() {
456:                    if (this .outbuffer == null) {
457:                        this .outbuffer = new SimpleOutputBuffer(2048, allocator);
458:                    }
459:                    return this .outbuffer;
460:                }
461:
462:                public int getInputState() {
463:                    return this .inputState;
464:                }
465:
466:                public void setInputState(int inputState) {
467:                    this .inputState = inputState;
468:                }
469:
470:                public int getOutputState() {
471:                    return this .outputState;
472:                }
473:
474:                public void setOutputState(int outputState) {
475:                    this .outputState = outputState;
476:                }
477:
478:                public HttpRequest getRequest() {
479:                    return this .request;
480:                }
481:
482:                public void setRequest(final HttpRequest request) {
483:                    this .request = request;
484:                }
485:
486:                public void resetInput() {
487:                    this .inbuffer = null;
488:                    this .request = null;
489:                    this .inputState = READY;
490:                }
491:
492:                public void resetOutput() {
493:                    this.outbuffer = null;
494:                    this.outputState = READY;
495:                }
496:
497:            }
498:
499:        }
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