Source Code Cross Referenced for StandardWrapperValve.java in  » Sevlet-Container » tomcat-catalina » org » apache » catalina » core » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Sevlet Container » tomcat catalina » org.apache.catalina.core 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 1999-2001,2004 The Apache Software Foundation.
003:         * 
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         * 
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         * 
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.apache.catalina.core;
018:
019:        import java.io.IOException;
020:
021:        import javax.management.MalformedObjectNameException;
022:        import javax.management.ObjectName;
023:        import javax.servlet.Servlet;
024:        import javax.servlet.ServletException;
025:        import javax.servlet.ServletRequest;
026:        import javax.servlet.ServletResponse;
027:        import javax.servlet.UnavailableException;
028:        import javax.servlet.http.HttpServletRequest;
029:        import javax.servlet.http.HttpServletResponse;
030:
031:        import org.apache.catalina.Context;
032:        import org.apache.catalina.Globals;
033:        import org.apache.catalina.HttpRequest;
034:        import org.apache.catalina.Logger;
035:        import org.apache.catalina.Request;
036:        import org.apache.catalina.Response;
037:        import org.apache.catalina.ValveContext;
038:        import org.apache.catalina.connector.ClientAbortException;
039:        import org.apache.catalina.util.StringManager;
040:        import org.apache.catalina.valves.ValveBase;
041:        import org.apache.commons.beanutils.PropertyUtils;
042:        import org.apache.commons.logging.Log;
043:        import org.apache.commons.logging.LogFactory;
044:        import org.apache.tomcat.util.buf.MessageBytes;
045:
046:        /**
047:         * Valve that implements the default basic behavior for the
048:         * <code>StandardWrapper</code> container implementation.
049:         *
050:         * @author Craig R. McClanahan
051:         * @version $Revision: 1.26 $ $Date: 2004/03/04 21:23:18 $
052:         */
053:
054:        final class StandardWrapperValve extends ValveBase {
055:
056:            private static Log log = LogFactory
057:                    .getLog(StandardWrapperValve.class);
058:
059:            // ----------------------------------------------------- Instance Variables
060:
061:            // Some JMX statistics. This vavle is associated with a StandardWrapper.
062:            // We exponse the StandardWrapper as JMX ( j2eeType=Servlet ). The fields
063:            // are here for performance.
064:            private volatile long processingTime;
065:            private volatile long maxTime;
066:            private volatile long minTime = Long.MAX_VALUE;
067:            private volatile int requestCount;
068:            private volatile int errorCount;
069:
070:            /**
071:             * The string manager for this package.
072:             */
073:            private static final StringManager sm = StringManager
074:                    .getManager(Constants.Package);
075:
076:            // --------------------------------------------------------- Public Methods
077:
078:            /**
079:             * Invoke the servlet we are managing, respecting the rules regarding
080:             * servlet lifecycle and SingleThreadModel support.
081:             *
082:             * @param request Request to be processed
083:             * @param response Response to be produced
084:             * @param valveContext Valve context used to forward to the next Valve
085:             *
086:             * @exception IOException if an input/output error occurred
087:             * @exception ServletException if a servlet error occurred
088:             */
089:            public final void invoke(Request request, Response response,
090:                    ValveContext valveContext) throws IOException,
091:                    ServletException {
092:
093:                // Initialize local variables we may need
094:                boolean unavailable = false;
095:                Throwable throwable = null;
096:                // This should be a Request attribute...
097:                long t1 = System.currentTimeMillis();
098:                requestCount++;
099:                StandardWrapper wrapper = (StandardWrapper) getContainer();
100:                HttpRequest hrequest = (HttpRequest) request;
101:                Servlet servlet = null;
102:                HttpServletRequest hreq = (HttpServletRequest) request
103:                        .getRequest();
104:                HttpServletResponse hres = (HttpServletResponse) response
105:                        .getResponse();
106:
107:                // Check for the application being marked unavailable
108:                if (!((Context) wrapper.getParent()).getAvailable()) {
109:                    hres.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
110:                            sm.getString("standardContext.isUnavailable"));
111:                    unavailable = true;
112:                }
113:
114:                // Check for the servlet being marked unavailable
115:                if (!unavailable && wrapper.isUnavailable()) {
116:                    log(sm.getString("standardWrapper.isUnavailable", wrapper
117:                            .getName()));
118:                    if (hres == null) {
119:                        ; // NOTE - Not much we can do generically
120:                    } else {
121:                        long available = wrapper.getAvailable();
122:                        if ((available > 0L) && (available < Long.MAX_VALUE)) {
123:                            hres.setDateHeader("Retry-After", available);
124:                            hres.sendError(
125:                                    HttpServletResponse.SC_SERVICE_UNAVAILABLE,
126:                                    sm.getString(
127:                                            "standardWrapper.isUnavailable",
128:                                            wrapper.getName()));
129:                        } else if (available == Long.MAX_VALUE) {
130:                            hres.sendError(HttpServletResponse.SC_NOT_FOUND, sm
131:                                    .getString("standardWrapper.notFound",
132:                                            wrapper.getName()));
133:                        }
134:                    }
135:                    unavailable = true;
136:                }
137:
138:                // Allocate a servlet instance to process this request
139:                try {
140:                    if (!unavailable) {
141:                        servlet = wrapper.allocate();
142:                    }
143:                } catch (UnavailableException e) {
144:                    long available = wrapper.getAvailable();
145:                    if ((available > 0L) && (available < Long.MAX_VALUE)) {
146:                        hres.setDateHeader("Retry-After", available);
147:                        hres.sendError(
148:                                HttpServletResponse.SC_SERVICE_UNAVAILABLE,
149:                                sm.getString("standardWrapper.isUnavailable",
150:                                        wrapper.getName()));
151:                    } else if (available == Long.MAX_VALUE) {
152:                        hres.sendError(HttpServletResponse.SC_NOT_FOUND, sm
153:                                .getString("standardWrapper.notFound", wrapper
154:                                        .getName()));
155:                    }
156:                } catch (ServletException e) {
157:                    log(sm.getString("standardWrapper.allocateException",
158:                            wrapper.getName()), e);
159:                    throwable = e;
160:                    exception(request, response, e);
161:                    servlet = null;
162:                } catch (Throwable e) {
163:                    log(sm.getString("standardWrapper.allocateException",
164:                            wrapper.getName()), e);
165:                    throwable = e;
166:                    exception(request, response, e);
167:                    servlet = null;
168:                }
169:
170:                // Acknowlege the request
171:                try {
172:                    response.sendAcknowledgement();
173:                } catch (IOException e) {
174:                    hreq.removeAttribute(Globals.JSP_FILE_ATTR);
175:                    log(sm.getString("standardWrapper.acknowledgeException",
176:                            wrapper.getName()), e);
177:                    throwable = e;
178:                    exception(request, response, e);
179:                } catch (Throwable e) {
180:                    log(sm.getString("standardWrapper.acknowledgeException",
181:                            wrapper.getName()), e);
182:                    throwable = e;
183:                    exception(request, response, e);
184:                    servlet = null;
185:                }
186:                MessageBytes requestPathMB = null;
187:                if (hreq != null) {
188:                    requestPathMB = hrequest.getRequestPathMB();
189:                }
190:                hreq.setAttribute(
191:                        ApplicationFilterFactory.DISPATCHER_TYPE_ATTR,
192:                        ApplicationFilterFactory.REQUEST_INTEGER);
193:                hreq.setAttribute(
194:                        ApplicationFilterFactory.DISPATCHER_REQUEST_PATH_ATTR,
195:                        requestPathMB);
196:                // Create the filter chain for this request
197:                ApplicationFilterFactory factory = ApplicationFilterFactory
198:                        .getInstance();
199:                ApplicationFilterChain filterChain = factory.createFilterChain(
200:                        (ServletRequest) request, wrapper, servlet);
201:
202:                // Call the filter chain for this request
203:                // NOTE: This also calls the servlet's service() method
204:                try {
205:                    String jspFile = wrapper.getJspFile();
206:                    if (jspFile != null)
207:                        hreq.setAttribute(Globals.JSP_FILE_ATTR, jspFile);
208:                    else
209:                        hreq.removeAttribute(Globals.JSP_FILE_ATTR);
210:                    if ((servlet != null) && (filterChain != null)) {
211:                        filterChain.doFilter(hreq, hres);
212:                    }
213:                    hreq.removeAttribute(Globals.JSP_FILE_ATTR);
214:                } catch (ClientAbortException e) {
215:                    hreq.removeAttribute(Globals.JSP_FILE_ATTR);
216:                    throwable = e;
217:                    exception(request, response, e);
218:                } catch (IOException e) {
219:                    hreq.removeAttribute(Globals.JSP_FILE_ATTR);
220:                    log(sm.getString("standardWrapper.serviceException",
221:                            wrapper.getName()), e);
222:                    throwable = e;
223:                    exception(request, response, e);
224:                } catch (UnavailableException e) {
225:                    hreq.removeAttribute(Globals.JSP_FILE_ATTR);
226:                    log(sm.getString("standardWrapper.serviceException",
227:                            wrapper.getName()), e);
228:                    //            throwable = e;
229:                    //            exception(request, response, e);
230:                    wrapper.unavailable(e);
231:                    long available = wrapper.getAvailable();
232:                    if ((available > 0L) && (available < Long.MAX_VALUE)) {
233:                        hres.setDateHeader("Retry-After", available);
234:                        hres.sendError(
235:                                HttpServletResponse.SC_SERVICE_UNAVAILABLE,
236:                                sm.getString("standardWrapper.isUnavailable",
237:                                        wrapper.getName()));
238:                    } else if (available == Long.MAX_VALUE) {
239:                        hres.sendError(HttpServletResponse.SC_NOT_FOUND, sm
240:                                .getString("standardWrapper.notFound", wrapper
241:                                        .getName()));
242:                    }
243:                    // Do not save exception in 'throwable', because we
244:                    // do not want to do exception(request, response, e) processing
245:                } catch (ServletException e) {
246:                    hreq.removeAttribute(Globals.JSP_FILE_ATTR);
247:                    Throwable rootCause = e;
248:                    Throwable rootCauseCheck = null;
249:
250:                    // Extra aggressive rootCause finding
251:                    do {
252:                        try {
253:                            rootCauseCheck = (Throwable) PropertyUtils
254:                                    .getProperty(rootCause, "rootCause");
255:                            if (rootCauseCheck != null)
256:                                rootCause = rootCauseCheck;
257:
258:                        } catch (ClassCastException ex) {
259:                            rootCauseCheck = null;
260:                        } catch (IllegalAccessException ex) {
261:                            rootCauseCheck = null;
262:                        } catch (NoSuchMethodException ex) {
263:                            rootCauseCheck = null;
264:                        } catch (java.lang.reflect.InvocationTargetException ex) {
265:                            rootCauseCheck = null;
266:                        }
267:                    } while (rootCauseCheck != null);
268:
269:                    if (!(rootCause instanceof  ClientAbortException)) {
270:                        log(sm.getString("standardWrapper.serviceException",
271:                                wrapper.getName()), rootCause);
272:                    }
273:                    throwable = e;
274:                    exception(request, response, e);
275:                } catch (Throwable e) {
276:                    hreq.removeAttribute(Globals.JSP_FILE_ATTR);
277:                    log(sm.getString("standardWrapper.serviceException",
278:                            wrapper.getName()), e);
279:                    throwable = e;
280:                    exception(request, response, e);
281:                }
282:
283:                // Release the filter chain (if any) for this request
284:                try {
285:                    if (filterChain != null)
286:                        filterChain.release();
287:                } catch (Throwable e) {
288:                    log(sm.getString("standardWrapper.releaseFilters", wrapper
289:                            .getName()), e);
290:                    if (throwable == null) {
291:                        throwable = e;
292:                        exception(request, response, e);
293:                    }
294:                }
295:
296:                // Deallocate the allocated servlet instance
297:                try {
298:                    if (servlet != null) {
299:                        wrapper.deallocate(servlet);
300:                    }
301:                } catch (Throwable e) {
302:                    log(sm.getString("standardWrapper.deallocateException",
303:                            wrapper.getName()), e);
304:                    if (throwable == null) {
305:                        throwable = e;
306:                        exception(request, response, e);
307:                    }
308:                }
309:
310:                // If this servlet has been marked permanently unavailable,
311:                // unload it and release this instance
312:                try {
313:                    if ((servlet != null)
314:                            && (wrapper.getAvailable() == Long.MAX_VALUE)) {
315:                        wrapper.unload();
316:                    }
317:                } catch (Throwable e) {
318:                    log(sm.getString("standardWrapper.unloadException", wrapper
319:                            .getName()), e);
320:                    if (throwable == null) {
321:                        throwable = e;
322:                        exception(request, response, e);
323:                    }
324:                }
325:                long t2 = System.currentTimeMillis();
326:
327:                long time = t2 - t1;
328:                processingTime += time;
329:                if (time > maxTime)
330:                    maxTime = time;
331:                if (time < minTime)
332:                    minTime = time;
333:
334:            }
335:
336:            // -------------------------------------------------------- Private Methods
337:
338:            /**
339:             * Log a message on the Logger associated with our Container (if any)
340:             *
341:             * @param message Message to be logged
342:             */
343:            private void log(String message) {
344:
345:                Logger logger = null;
346:                if (container != null)
347:                    logger = container.getLogger();
348:                if (logger != null)
349:                    logger.log("StandardWrapperValve[" + container.getName()
350:                            + "]: " + message);
351:                else {
352:                    String containerName = null;
353:                    if (container != null)
354:                        containerName = container.getName();
355:                    System.out.println("StandardWrapperValve[" + containerName
356:                            + "]: " + message);
357:                }
358:
359:            }
360:
361:            /**
362:             * Log a message on the Logger associated with our Container (if any)
363:             *
364:             * @param message Message to be logged
365:             * @param throwable Associated exception
366:             */
367:            private void log(String message, Throwable throwable) {
368:
369:                Logger logger = null;
370:                if (container != null)
371:                    logger = container.getLogger();
372:                if (logger != null)
373:                    logger.log("StandardWrapperValve[" + container.getName()
374:                            + "]: " + message, throwable);
375:                else {
376:                    String containerName = null;
377:                    if (container != null)
378:                        containerName = container.getName();
379:                    System.out.println("StandardWrapperValve[" + containerName
380:                            + "]: " + message);
381:                    System.out.println("" + throwable);
382:                    throwable.printStackTrace(System.out);
383:                }
384:
385:            }
386:
387:            /**
388:             * Handle the specified ServletException encountered while processing
389:             * the specified Request to produce the specified Response.  Any
390:             * exceptions that occur during generation of the exception report are
391:             * logged and swallowed.
392:             *
393:             * @param request The request being processed
394:             * @param response The response being generated
395:             * @param exception The exception that occurred (which possibly wraps
396:             *  a root cause exception
397:             */
398:            private void exception(Request request, Response response,
399:                    Throwable exception) {
400:                ServletRequest sreq = request.getRequest();
401:                sreq.setAttribute(Globals.EXCEPTION_ATTR, exception);
402:
403:                ServletResponse sresponse = response.getResponse();
404:                if (sresponse instanceof  HttpServletResponse)
405:                    ((HttpServletResponse) sresponse)
406:                            .setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
407:
408:            }
409:
410:            public long getProcessingTime() {
411:                return processingTime;
412:            }
413:
414:            public void setProcessingTime(long processingTime) {
415:                this .processingTime = processingTime;
416:            }
417:
418:            public long getMaxTime() {
419:                return maxTime;
420:            }
421:
422:            public void setMaxTime(long maxTime) {
423:                this .maxTime = maxTime;
424:            }
425:
426:            public long getMinTime() {
427:                return minTime;
428:            }
429:
430:            public void setMinTime(long minTime) {
431:                this .minTime = minTime;
432:            }
433:
434:            public int getRequestCount() {
435:                return requestCount;
436:            }
437:
438:            public void setRequestCount(int requestCount) {
439:                this .requestCount = requestCount;
440:            }
441:
442:            public int getErrorCount() {
443:                return errorCount;
444:            }
445:
446:            public void setErrorCount(int errorCount) {
447:                this .errorCount = errorCount;
448:            }
449:
450:            // Don't register in JMX
451:
452:            public ObjectName createObjectName(String domain, ObjectName parent)
453:                    throws MalformedObjectNameException {
454:                return null;
455:            }
456:        }
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