Source Code Cross Referenced for StatusGenerator.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » generation » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Content Management System » apache lenya 2.0 » org.apache.cocoon.generation 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         *
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.cocoon.generation;
018:
019:        import org.apache.avalon.framework.configuration.Configurable;
020:        import org.apache.avalon.framework.configuration.Configuration;
021:        import org.apache.avalon.framework.configuration.ConfigurationException;
022:        import org.apache.avalon.framework.context.Context;
023:        import org.apache.avalon.framework.context.ContextException;
024:        import org.apache.avalon.framework.context.Contextualizable;
025:        import org.apache.avalon.framework.parameters.Parameters;
026:        import org.apache.avalon.framework.service.ServiceException;
027:        import org.apache.avalon.framework.service.ServiceManager;
028:
029:        import org.apache.cocoon.Constants;
030:        import org.apache.cocoon.ProcessingException;
031:        import org.apache.cocoon.ResourceNotFoundException;
032:        import org.apache.cocoon.components.source.SourceUtil;
033:        import org.apache.cocoon.environment.SourceResolver;
034:        import org.apache.cocoon.xml.AttributesImpl;
035:        import org.apache.cocoon.xml.XMLUtils;
036:
037:        import org.apache.commons.lang.SystemUtils;
038:        import org.apache.excalibur.source.Source;
039:        import org.apache.excalibur.source.SourceException;
040:        import org.apache.excalibur.source.TraversableSource;
041:        import org.apache.excalibur.store.Store;
042:        import org.apache.excalibur.store.StoreJanitor;
043:        import org.xml.sax.Attributes;
044:        import org.xml.sax.SAXException;
045:
046:        import java.io.File;
047:        import java.io.IOException;
048:        import java.net.InetAddress;
049:        import java.net.UnknownHostException;
050:        import java.text.DateFormat;
051:        import java.util.ArrayList;
052:        import java.util.Collection;
053:        import java.util.Date;
054:        import java.util.Enumeration;
055:        import java.util.Iterator;
056:        import java.util.List;
057:        import java.util.Map;
058:        import java.util.Properties;
059:        import java.util.Set;
060:        import java.util.StringTokenizer;
061:        import java.util.TreeSet;
062:
063:        /**
064:         * @cocoon.sitemap.component.documentation
065:         * Generates an XML representation of the current status of Cocoon.
066:         *
067:         * @cocoon.sitemap.component.name   status
068:         * @cocoon.sitemap.component.label  content
069:         * @cocoon.sitemap.component.logger sitemap.generator.status
070:         *
071:         * @cocoon.sitemap.component.pooling.max  16
072:         *
073:         * Potted DTD:
074:         *
075:         * <code>
076:         * &lt;!ELEMENT statusinfo (group|value)*&gt;
077:         *
078:         * &lt;!ATTLIST statusinfo
079:         *     date CDATA #IMPLIED
080:         *     host CDATA #IMPLIED
081:         *     cocoon-version CDATA #IMPLIED
082:         * &gt;
083:         *
084:         * &lt;!ELEMENT group (group|value)*&gt;
085:         * &lt;!ATTLIST group
086:         *     name CDATA #IMPLIED
087:         * &gt;
088:         *
089:         * &lt;!ELEMENT value (line)+&gt;
090:         * &lt;!ATTLIST value
091:         *     name CDATA #REQUIRED
092:         *
093:         * &lt;!ELEMENT line (#PCDATA)+&gt;
094:         * &gt;
095:         * </code>
096:         *
097:         * @author <a href="mailto:paul@luminas.co.uk">Paul Russell</a> (Luminas Limited)
098:         * @author <a href="mailto:stefano@apache.org">Stefano Mazzocchi</a>
099:         * @author <a href="mailto:skoechlin@ivision.fr">S&eacute;bastien K&oelig;chlin</a> (iVision)
100:         * @author <a href="mailto:g-froehlich@gmx.de">Gerhard Froehlich</a>
101:         * @version $Id: StatusGenerator.java 433543 2006-08-22 06:22:54Z crossley $
102:         */
103:        public class StatusGenerator extends ServiceableGenerator implements 
104:                Contextualizable, Configurable {
105:
106:            /**
107:             * The XML namespace for the output document.
108:             */
109:            public static final String NAMESPACE = "http://apache.org/cocoon/status/2.0";
110:
111:            /**
112:             * The XML namespace for xlink
113:             */
114:            protected static final String XLINK_NS = "http://www.w3.org/1999/xlink";
115:
116:            /**
117:             * The namespace prefix for xlink namespace
118:             */
119:            protected static final String XLINK_PREFIX = "xlink";
120:
121:            /**
122:             * The component context.
123:             */
124:            protected Context context;
125:
126:            /**
127:             * The StoreJanitor used to get cache statistics
128:             */
129:            protected StoreJanitor storeJanitor;
130:
131:            /**
132:             * The persistent store
133:             */
134:            protected Store storePersistent;
135:
136:            /**
137:             * List & show the contents of WEB/lib
138:             */
139:            private boolean showLibrary;
140:
141:            /**
142:             * WEB-INF/lib directory
143:             */
144:            private Source libDirectory;
145:
146:            public void contextualize(Context context) throws ContextException {
147:                this .context = context;
148:            }
149:
150:            public void configure(Configuration configuration)
151:                    throws ConfigurationException {
152:                this .showLibrary = configuration.getChild("show-libraries")
153:                        .getValueAsBoolean(true);
154:            }
155:
156:            /**
157:             * Set the current <code>ServiceManager</code> instance used by this
158:             * <code>Serviceable</code>.
159:             * Need to get statistics about cache hits
160:             */
161:            public void service(ServiceManager manager) throws ServiceException {
162:                super .service(manager);
163:
164:                if (this .manager.hasService(StoreJanitor.ROLE)) {
165:                    this .storeJanitor = (StoreJanitor) manager
166:                            .lookup(StoreJanitor.ROLE);
167:                } else {
168:                    getLogger()
169:                            .info(
170:                                    "StoreJanitor is not available. Sorry, no cache statistics");
171:                }
172:
173:                if (this .manager.hasService(Store.PERSISTENT_STORE)) {
174:                    this .storePersistent = (Store) this .manager
175:                            .lookup(Store.PERSISTENT_STORE);
176:                } else {
177:                    getLogger()
178:                            .info(
179:                                    "Persistent Store is not available. Sorry no cache statistics about it.");
180:                }
181:            }
182:
183:            public void setup(SourceResolver resolver, Map objectModel,
184:                    String src, Parameters par) throws ProcessingException,
185:                    SAXException, IOException {
186:                super .setup(resolver, objectModel, src, par);
187:
188:                if (this .showLibrary) {
189:                    try {
190:                        this .libDirectory = super .resolver
191:                                .resolveURI("context://WEB-INF/lib");
192:                    } catch (SourceException e) {
193:                        throw SourceUtil.handle(e);
194:                    }
195:                }
196:            }
197:
198:            /**
199:             * @see org.apache.avalon.framework.activity.Disposable#dispose()
200:             */
201:            public void dispose() {
202:                if (this .manager != null) {
203:                    this .manager.release(this .storePersistent);
204:                    this .manager.release(this .storeJanitor);
205:                    this .storePersistent = null;
206:                    this .storeJanitor = null;
207:                }
208:
209:                if (this .libDirectory != null) {
210:                    super .resolver.release(this .libDirectory);
211:                    this .libDirectory = null;
212:                }
213:
214:                super .dispose();
215:            }
216:
217:            /**
218:             * Generate the status information in XML format.
219:             * @throws SAXException
220:             *         when there is a problem creating the output SAX events.
221:             */
222:            public void generate() throws SAXException, ProcessingException {
223:
224:                // Start the document and set the namespace.
225:                super .contentHandler.startDocument();
226:                super .contentHandler.startPrefixMapping("", NAMESPACE);
227:                super .contentHandler.startPrefixMapping(XLINK_PREFIX, XLINK_NS);
228:
229:                genStatus();
230:
231:                // End the document.
232:                super .contentHandler.endPrefixMapping(XLINK_PREFIX);
233:                super .contentHandler.endPrefixMapping("");
234:                super .contentHandler.endDocument();
235:            }
236:
237:            /**
238:             * Generate the main status document.
239:             */
240:            private void genStatus() throws SAXException, ProcessingException {
241:                // Root element.
242:
243:                // The current date and time.
244:                String dateTime = DateFormat.getDateTimeInstance().format(
245:                        new Date());
246:                String localHost;
247:
248:                // The local host.
249:                try {
250:                    localHost = InetAddress.getLocalHost().getHostName();
251:                } catch (UnknownHostException e) {
252:                    getLogger().debug("StatusGenerator:UnknownHost", e);
253:                    localHost = "";
254:                } catch (SecurityException e) {
255:                    getLogger().debug("StatusGenerator:Security", e);
256:                    localHost = "";
257:                }
258:
259:                AttributesImpl atts = new AttributesImpl();
260:                atts.addCDATAAttribute(NAMESPACE, "date", dateTime);
261:                atts.addCDATAAttribute(NAMESPACE, "host", localHost);
262:                atts.addCDATAAttribute(NAMESPACE, "cocoon-version",
263:                        Constants.VERSION);
264:                super .contentHandler.startElement(NAMESPACE, "statusinfo",
265:                        "statusinfo", atts);
266:
267:                genVMStatus();
268:                genProperties();
269:                if (this .showLibrary) {
270:                    genLibrarylist();
271:                }
272:
273:                // End root element.
274:                super .contentHandler.endElement(NAMESPACE, "statusinfo",
275:                        "statusinfo");
276:            }
277:
278:            private void genVMStatus() throws SAXException {
279:                AttributesImpl atts = new AttributesImpl();
280:                startGroup("VM");
281:
282:                // BEGIN ClassPath
283:                String classpath = SystemUtils.JAVA_CLASS_PATH;
284:                if (classpath != null) {
285:                    List paths = new ArrayList();
286:                    StringTokenizer tokenizer = new StringTokenizer(classpath,
287:                            SystemUtils.PATH_SEPARATOR);
288:                    while (tokenizer.hasMoreTokens()) {
289:                        paths.add(tokenizer.nextToken());
290:                    }
291:                    addMultilineValue("classpath", paths);
292:                }
293:                // END ClassPath
294:
295:                // BEGIN CONTEXT CLASSPATH
296:                String contextClassPath = null;
297:                try {
298:                    contextClassPath = (String) this .context
299:                            .get(Constants.CONTEXT_CLASSPATH);
300:                } catch (ContextException e) {
301:                    // we ignore this
302:                }
303:                if (contextClassPath != null) {
304:                    List paths = new ArrayList();
305:                    StringTokenizer tokenizer = new StringTokenizer(
306:                            contextClassPath, File.pathSeparator);
307:                    while (tokenizer.hasMoreTokens()) {
308:                        paths.add(tokenizer.nextToken());
309:                    }
310:                    addMultilineValue("context-classpath", paths);
311:                }
312:                // END CONTEXT CLASSPATH
313:
314:                // BEGIN Memory status
315:                startGroup("Memory");
316:                final long totalMemory = Runtime.getRuntime().totalMemory();
317:                final long freeMemory = Runtime.getRuntime().freeMemory();
318:                addValue("total", String.valueOf(totalMemory));
319:                addValue("used", String.valueOf(totalMemory - freeMemory));
320:                addValue("free", String.valueOf(freeMemory));
321:                endGroup();
322:                // END Memory status
323:
324:                // BEGIN JRE
325:                startGroup("JRE");
326:                addValue("version", SystemUtils.JAVA_VERSION);
327:                atts.clear();
328:                // qName = prefix + ':' + localName
329:                atts.addAttribute(XLINK_NS, "type", XLINK_PREFIX + ":type",
330:                        "CDATA", "simple");
331:                atts.addAttribute(XLINK_NS, "href", XLINK_PREFIX + ":href",
332:                        "CDATA", SystemUtils.JAVA_VENDOR_URL);
333:                addValue("java-vendor", SystemUtils.JAVA_VENDOR, atts);
334:                endGroup();
335:                // END JRE
336:
337:                // BEGIN Operating system
338:                startGroup("Operating System");
339:                addValue("name", SystemUtils.OS_NAME);
340:                addValue("architecture", SystemUtils.OS_ARCH);
341:                addValue("version", SystemUtils.OS_VERSION);
342:                endGroup();
343:                // END operating system
344:
345:                // BEGIN Cache
346:                if (this .storeJanitor != null) {
347:                    startGroup("Store Janitor");
348:
349:                    // For each element in StoreJanitor
350:                    Iterator i = this .storeJanitor.iterator();
351:                    while (i.hasNext()) {
352:                        Store store = (Store) i.next();
353:                        startGroup(store.getClass().getName() + " (hash = 0x"
354:                                + Integer.toHexString(store.hashCode()) + ")");
355:                        int size = 0;
356:                        int empty = 0;
357:                        atts.clear();
358:                        atts.addAttribute(NAMESPACE, "name", "name", "CDATA",
359:                                "cached");
360:                        super .contentHandler.startElement(NAMESPACE, "value",
361:                                "value", atts);
362:
363:                        atts.clear();
364:                        Enumeration e = store.keys();
365:                        while (e.hasMoreElements()) {
366:                            size++;
367:                            Object key = e.nextElement();
368:                            Object val = store.get(key);
369:                            String line;
370:                            if (val == null) {
371:                                empty++;
372:                            } else {
373:                                line = key + " (class: "
374:                                        + val.getClass().getName() + ")";
375:                                super .contentHandler.startElement(NAMESPACE,
376:                                        "line", "line", atts);
377:                                super .contentHandler.characters(line
378:                                        .toCharArray(), 0, line.length());
379:                                super .contentHandler.endElement(NAMESPACE,
380:                                        "line", "line");
381:                            }
382:                        }
383:                        if (size == 0) {
384:                            super .contentHandler.startElement(NAMESPACE,
385:                                    "line", "line", atts);
386:                            String value = "[empty]";
387:                            super .contentHandler.characters(
388:                                    value.toCharArray(), 0, value.length());
389:                            super .contentHandler.endElement(NAMESPACE, "line",
390:                                    "line");
391:                        }
392:                        super .contentHandler.endElement(NAMESPACE, "value",
393:                                "value");
394:
395:                        addValue("size", String.valueOf(size)
396:                                + " items in cache (" + empty + " are empty)");
397:                        endGroup();
398:                    }
399:                    endGroup();
400:                }
401:
402:                if (this .storePersistent != null) {
403:                    startGroup(storePersistent.getClass().getName()
404:                            + " (hash = 0x"
405:                            + Integer.toHexString(storePersistent.hashCode())
406:                            + ")");
407:                    int size = 0;
408:                    int empty = 0;
409:                    atts.clear();
410:                    atts.addAttribute(NAMESPACE, "name", "name", "CDATA",
411:                            "cached");
412:                    super .contentHandler.startElement(NAMESPACE, "value",
413:                            "value", atts);
414:
415:                    atts.clear();
416:                    Enumeration e = this .storePersistent.keys();
417:                    while (e.hasMoreElements()) {
418:                        size++;
419:                        Object key = e.nextElement();
420:                        Object val = storePersistent.get(key);
421:                        String line;
422:                        if (val == null) {
423:                            empty++;
424:                        } else {
425:                            line = key + " (class: " + val.getClass().getName()
426:                                    + ")";
427:                            super .contentHandler.startElement(NAMESPACE,
428:                                    "line", "line", atts);
429:                            super .contentHandler.characters(line.toCharArray(),
430:                                    0, line.length());
431:                            super .contentHandler.endElement(NAMESPACE, "line",
432:                                    "line");
433:                        }
434:                    }
435:                    if (size == 0) {
436:                        super .contentHandler.startElement(NAMESPACE, "line",
437:                                "line", atts);
438:                        String value = "[empty]";
439:                        super .contentHandler.characters(value.toCharArray(), 0,
440:                                value.length());
441:                        super .contentHandler.endElement(NAMESPACE, "line",
442:                                "line");
443:                    }
444:                    super .contentHandler
445:                            .endElement(NAMESPACE, "value", "value");
446:
447:                    addValue("size", size + " items in cache (" + empty
448:                            + " are empty)");
449:                    endGroup();
450:                }
451:                // END Cache
452:
453:                endGroup();
454:            }
455:
456:            private void genProperties() throws SAXException {
457:                this .startGroup("System-Properties");
458:                final Properties p = System.getProperties();
459:                final Enumeration e = p.keys();
460:                while (e.hasMoreElements()) {
461:                    final String key = (String) e.nextElement();
462:                    final String value = p.getProperty(key);
463:                    this .addValue(key, value);
464:                }
465:                this .endGroup();
466:            }
467:
468:            private void genLibrarylist() throws SAXException,
469:                    ProcessingException {
470:                try {
471:                    if (this .libDirectory instanceof  TraversableSource) {
472:                        startGroup("WEB-INF/lib");
473:
474:                        Set files = new TreeSet();
475:                        Collection kids = ((TraversableSource) this .libDirectory)
476:                                .getChildren();
477:                        try {
478:                            for (Iterator i = kids.iterator(); i.hasNext();) {
479:                                final Source lib = (Source) i.next();
480:                                final String name = lib.getURI().substring(
481:                                        lib.getURI().lastIndexOf('/') + 1);
482:                                files.add(name);
483:                            }
484:                        } finally {
485:                            for (Iterator i = kids.iterator(); i.hasNext();) {
486:                                final Source lib = (Source) i.next();
487:                                super .resolver.release(lib);
488:                            }
489:                        }
490:
491:                        for (Iterator i = files.iterator(); i.hasNext();) {
492:                            addValue("file", (String) i.next());
493:                        }
494:
495:                        endGroup();
496:                    }
497:                } catch (SourceException e) {
498:                    throw new ResourceNotFoundException(
499:                            "Could not read directory", e);
500:                }
501:            }
502:
503:            /** Utility function to begin a <code>group</code> tag pair. */
504:            private void startGroup(String name) throws SAXException {
505:                startGroup(name, null);
506:            }
507:
508:            /** Utility function to begin a <code>group</code> tag pair with added attributes. */
509:            private void startGroup(String name, Attributes atts)
510:                    throws SAXException {
511:                AttributesImpl ai = (atts == null) ? new AttributesImpl()
512:                        : new AttributesImpl(atts);
513:                ai.addAttribute(NAMESPACE, "name", "name", "CDATA", name);
514:                super .contentHandler.startElement(NAMESPACE, "group", "group",
515:                        ai);
516:            }
517:
518:            /** Utility function to end a <code>group</code> tag pair. */
519:            private void endGroup() throws SAXException {
520:                super .contentHandler.endElement(NAMESPACE, "group", "group");
521:            }
522:
523:            /** Utility function to begin and end a <code>value</code> tag pair. */
524:            private void addValue(String name, String value)
525:                    throws SAXException {
526:                addValue(name, value, null);
527:            }
528:
529:            /** Utility function to begin and end a <code>value</code> tag pair with added attributes. */
530:            private void addValue(String name, String value, Attributes atts)
531:                    throws SAXException {
532:                AttributesImpl ai = (atts == null) ? new AttributesImpl()
533:                        : new AttributesImpl(atts);
534:                ai.addAttribute(NAMESPACE, "name", "name", "CDATA", name);
535:                super .contentHandler.startElement(NAMESPACE, "value", "value",
536:                        ai);
537:                super .contentHandler.startElement(NAMESPACE, "line", "line",
538:                        XMLUtils.EMPTY_ATTRIBUTES);
539:
540:                if (value != null) {
541:                    super .contentHandler.characters(value.toCharArray(), 0,
542:                            value.length());
543:                }
544:
545:                super .contentHandler.endElement(NAMESPACE, "line", "line");
546:                super .contentHandler.endElement(NAMESPACE, "value", "value");
547:            }
548:
549:            /** Utility function to begin and end a <code>value</code> tag pair. */
550:            private void addMultilineValue(String name, List values)
551:                    throws SAXException {
552:                addMultilineValue(name, values, null);
553:            }
554:
555:            /** Utility function to begin and end a <code>value</code> tag pair with added attributes. */
556:            private void addMultilineValue(String name, List values,
557:                    Attributes atts) throws SAXException {
558:                AttributesImpl ai = (atts == null) ? new AttributesImpl()
559:                        : new AttributesImpl(atts);
560:                ai.addAttribute(NAMESPACE, "name", "name", "CDATA", name);
561:                super .contentHandler.startElement(NAMESPACE, "value", "value",
562:                        ai);
563:
564:                for (int i = 0; i < values.size(); i++) {
565:                    String value = (String) values.get(i);
566:                    if (value != null) {
567:                        super .contentHandler.startElement(NAMESPACE, "line",
568:                                "line", XMLUtils.EMPTY_ATTRIBUTES);
569:                        super .contentHandler.characters(value.toCharArray(), 0,
570:                                value.length());
571:                        super .contentHandler.endElement(NAMESPACE, "line",
572:                                "line");
573:                    }
574:                }
575:                super .contentHandler.endElement(NAMESPACE, "value", "value");
576:            }
577:        }
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