Source Code Cross Referenced for VirtualTarget.java in  » J2EE » Pustefix » de » schlund » pfixxml » targets » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » Pustefix » de.schlund.pfixxml.targets 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * This file is part of PFIXCORE.
003:         *
004:         * PFIXCORE is free software; you can redistribute it and/or modify
005:         * it under the terms of the GNU Lesser General Public License as published by
006:         * the Free Software Foundation; either version 2 of the License, or
007:         * (at your option) any later version.
008:         *
009:         * PFIXCORE is distributed in the hope that it will be useful,
010:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
011:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
012:         * GNU Lesser General Public License for more details.
013:         *
014:         * You should have received a copy of the GNU Lesser General Public License
015:         * along with PFIXCORE; if not, write to the Free Software
016:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
017:         *
018:         */
019:        package de.schlund.pfixxml.targets;
020:
021:        import java.io.ByteArrayOutputStream;
022:        import java.io.IOException;
023:        import java.io.OutputStream;
024:        import java.util.Iterator;
025:        import java.util.TreeMap;
026:        import java.util.TreeSet;
027:
028:        import javax.xml.transform.Templates;
029:        import javax.xml.transform.TransformerException;
030:        import javax.xml.transform.stream.StreamResult;
031:
032:        import org.apache.log4j.NDC;
033:        import org.w3c.dom.Document;
034:
035:        import de.schlund.pfixxml.XMLException;
036:        import de.schlund.pfixxml.resources.FileResource;
037:        import de.schlund.pfixxml.resources.ResourceUtil;
038:        import de.schlund.pfixxml.util.Xslt;
039:
040:        /**
041:         * VirtualTarget.java
042:         *
043:         *
044:         * Created: Mon Jul 23 19:53:38 2001
045:         *
046:         * @author <a href="mailto: "Jens Lautenbacher</a>
047:         *
048:         *
049:         */
050:        public abstract class VirtualTarget extends TargetImpl {
051:            protected long modtime = 0;
052:
053:            protected TreeSet<PageInfo> pageinfos = new TreeSet<PageInfo>();
054:
055:            protected boolean forceupdate = false;
056:
057:            /**
058:             * @see de.schlund.pfixxml.targets.TargetRW#addPageInfo(de.schlund.pfixxml.targets.PageInfo)
059:             */
060:            public void addPageInfo(PageInfo info) {
061:                synchronized (pageinfos) {
062:                    pageinfos.add(info);
063:                }
064:            }
065:
066:            /**
067:             * @see de.schlund.pfixxml.targets.Target#getPageInfos()
068:             */
069:            public TreeSet<PageInfo> getPageInfos() {
070:                synchronized (pageinfos) {
071:                    return new TreeSet<PageInfo>(pageinfos);
072:                }
073:            }
074:
075:            /**
076:             * @see de.schlund.pfixxml.targets.TargetRW#setXMLSource(de.schlund.pfixxml.targets.Target)
077:             */
078:            public void setXMLSource(Target source) {
079:                xmlsource = source;
080:            }
081:
082:            /**
083:             * @see de.schlund.pfixxml.targets.TargetRW#setXSLSource(de.schlund.pfixxml.targets.Target)
084:             */
085:            public void setXSLSource(Target source) {
086:                xslsource = source;
087:            }
088:
089:            /**
090:             * @see de.schlund.pfixxml.targets.TargetRW#addParam(java.lang.String, java.lang.String)
091:             */
092:            public void addParam(String key, Object val) {
093:                synchronized (params) {
094:                    params.put(key, val);
095:                }
096:            }
097:
098:            /**
099:             * @see de.schlund.pfixxml.targets.Target#getModTime()
100:             */
101:            public long getModTime() {
102:                if (modtime == 0) {
103:                    synchronized (this ) {
104:                        if (modtime == 0) {
105:                            FileResource doc = ResourceUtil.getFileResource(
106:                                    getTargetGenerator().getDisccachedir(),
107:                                    getTargetKey());
108:                            if (doc.exists() && doc.isFile()) {
109:                                setModTime(doc.lastModified());
110:                            }
111:                        }
112:                    }
113:                }
114:                return modtime;
115:            }
116:
117:            /**
118:             * @see de.schlund.pfixxml.targets.Target#needsUpdate()
119:             */
120:            public boolean needsUpdate() throws Exception {
121:                long mymodtime = getModTime();
122:                long xmlmod;
123:                long xslmod;
124:                long depmod = 0;
125:                boolean xmlup;
126:                boolean xslup;
127:                boolean depup = false;
128:                Target tmp;
129:
130:                tmp = getXMLSource();
131:                xmlup = tmp.needsUpdate();
132:                xmlmod = tmp.getModTime();
133:                tmp = getXSLSource();
134:                xslup = tmp.needsUpdate();
135:                xslmod = tmp.getModTime();
136:
137:                for (Iterator<AuxDependency> i = this .getAuxDependencyManager()
138:                        .getChildren().iterator(); i.hasNext();) {
139:                    AuxDependency aux = i.next();
140:                    if (aux.getType() == DependencyType.TARGET) {
141:                        Target auxtarget = ((AuxDependencyTarget) aux)
142:                                .getTarget();
143:                        depmod = Math.max(auxtarget.getModTime(), depmod);
144:                        if (auxtarget.needsUpdate()) {
145:                            depup = true;
146:                        }
147:                    }
148:                }
149:
150:                if (forceupdate)
151:                    return true;
152:                if (xslup || xmlup || depup)
153:                    return true;
154:                if ((xmlmod > mymodtime)
155:                        || (xslmod > mymodtime)
156:                        || getAuxDependencyManager().getMaxTimestamp() > mymodtime
157:                        || depmod > mymodtime)
158:                    return true;
159:                return false;
160:            }
161:
162:            /**
163:             * @see de.schlund.pfixxml.targets.TargetRW#storeValue(java.lang.Object)
164:             */
165:            public void storeValue(Object obj) {
166:                SPCache<Object, Object> cache = SPCacheFactory.getInstance()
167:                        .getCache();
168:                cache.setValue(this , obj);
169:            }
170:
171:            public String toString() {
172:                if (getXMLSource() != null && getXSLSource() != null) {
173:                    return "[TARGET: " + getType() + " " + getTargetKey() + "@"
174:                            + getTargetGenerator().getName() + "["
175:                            + themes.getId() + "]" + " <"
176:                            + getXMLSource().getTargetKey() + "> <"
177:                            + getXSLSource().getTargetKey() + ">]";
178:                } else {
179:                    return "[TARGET: " + getType() + " " + getTargetKey() + "@"
180:                            + getTargetGenerator().getName() + "["
181:                            + themes.getId() + "]]";
182:                }
183:            }
184:
185:            /**
186:             * @see de.schlund.pfixxml.targets.TargetImpl#setModTime(long)
187:             */
188:            // still to implement from TargetImpl:
189:            //protected abstract Object  getValueFromDiscCache() throws Exception;
190:            protected void setModTime(long mtime) {
191:                modtime = mtime;
192:            }
193:
194:            /**
195:             * @see de.schlund.pfixxml.targets.TargetImpl#getValueFromSPCache()
196:             */
197:            protected Object getValueFromSPCache() {
198:                SPCache<Object, Object> cache = SPCacheFactory.getInstance()
199:                        .getCache();
200:                return cache.getValue(this );
201:            }
202:
203:            /**
204:             * @see de.schlund.pfixxml.targets.TargetImpl#getModTimeMaybeUpdate()
205:             */
206:            protected long getModTimeMaybeUpdate()
207:                    throws TargetGenerationException, XMLException, IOException {
208:                // long currmodtime = getModTime();
209:                long maxmodtime = 0;
210:                long tmpmodtime;
211:                NDC.push("    ");
212:                TREE.debug("> " + getTargetKey());
213:                maxmodtime = ((TargetImpl) getXMLSource())
214:                        .getModTimeMaybeUpdate();
215:                // if (maxmodtime > currmodtime) {
216:                //     CAT.warn("### XMLSource of "  + getTargetKey() + " is newer! " + maxmodtime + ">" + currmodtime);
217:                // }
218:                tmpmodtime = ((TargetImpl) getXSLSource())
219:                        .getModTimeMaybeUpdate();
220:                // if (tmpmodtime > currmodtime) {
221:                //     CAT.warn("### XSLSource of "  + getTargetKey() + " is newer! " + tmpmodtime + ">" + currmodtime);
222:                // }
223:                maxmodtime = Math.max(tmpmodtime, maxmodtime);
224:                storedException = null;
225:                // check all the auxilliary sources from auxsource
226:                tmpmodtime = getAuxDependencyManager().getMaxTimestamp();
227:                // if (tmpmodtime > currmodtime) {
228:                //     CAT.warn("### AUX of "  + getTargetKey() + " is newer! " + tmpmodtime + ">" + currmodtime);
229:                // }
230:                maxmodtime = Math.max(tmpmodtime, maxmodtime);
231:
232:                // check target dependencies
233:                for (Iterator<AuxDependency> i = this .getAuxDependencyManager()
234:                        .getChildren().iterator(); i.hasNext();) {
235:                    AuxDependency aux = i.next();
236:                    if (aux.getType() == DependencyType.TARGET) {
237:                        Target auxtarget;
238:                        try {
239:                            auxtarget = ((AuxDependencyTarget) aux).getTarget();
240:                        } catch (Exception e) {
241:                            throw new TargetGenerationException(
242:                                    "Nested exception", e);
243:                        }
244:                        if (auxtarget instanceof  TargetImpl) {
245:                            tmpmodtime = ((TargetImpl) auxtarget)
246:                                    .getModTimeMaybeUpdate();
247:                        } else {
248:                            tmpmodtime = auxtarget.getModTime();
249:                        }
250:                        maxmodtime = Math.max(tmpmodtime, maxmodtime);
251:                    }
252:                }
253:
254:                // check target generator config / navigation tree
255:                tmpmodtime = getTargetGenerator().getConfigMaxModTime();
256:                maxmodtime = Math.max(tmpmodtime, maxmodtime);
257:
258:                if ((maxmodtime > getModTime()) || forceupdate) {
259:                    synchronized (this ) {
260:                        if ((maxmodtime > getModTime()) || forceupdate) {
261:                            try {
262:                                generateValue();
263:                                TREE.debug("  [" + getTargetKey()
264:                                        + ": generated...]");
265:                            } catch (TransformerException e) {
266:                                LOG.error("Error when generating: "
267:                                        + getTargetKey() + " from "
268:                                        + getXMLSource().getTargetKey()
269:                                        + " and "
270:                                        + getXSLSource().getTargetKey(), e);
271:                                // Now we invalidate the mem- and disc cache to force
272:                                // a complete rebuild of this target the next try
273:                                storeValue(null);
274:                                setModTime(-1);
275:                                FileResource cachefile = ResourceUtil
276:                                        .getFileResource(getTargetGenerator()
277:                                                .getDisccachedir(),
278:                                                getTargetKey());
279:                                if (cachefile.exists()) {
280:                                    cachefile.delete();
281:                                }
282:
283:                                TransformerException tex = e;
284:                                TargetGenerationException targetex = null;
285:                                if (storedException != null) {
286:                                    targetex = new TargetGenerationException(
287:                                            "Caught transformer exception when doing getModtimeMaybeUpdate",
288:                                            storedException);
289:                                } else {
290:                                    targetex = new TargetGenerationException(
291:                                            "Caught transformer exception when doing getModtimeMaybeUpdate",
292:                                            tex);
293:                                }
294:                                targetex.setTargetkey(targetkey);
295:                                throw targetex;
296:                            }
297:                        }
298:                    }
299:                } else {
300:                    TREE.debug("  [" + getTargetKey() + ": skipping...]");
301:                }
302:                NDC.pop();
303:                return getModTime();
304:            }
305:
306:            private void generateValue() throws XMLException,
307:                    TransformerException, IOException {
308:                String key = getTargetKey();
309:                Target tmpxmlsource = getXMLSource();
310:                Target tmpxslsource = getXSLSource();
311:                FileResource cachepath = getTargetGenerator().getDisccachedir();
312:                FileResource cachefile = ResourceUtil.getFileResource(
313:                        cachepath, key);
314:                cachefile.getParentAsFileResource().mkdirs();
315:                if (LOG.isDebugEnabled()) {
316:                    LOG.debug(key + ": Getting " + getType() + " by XSLTrafo ("
317:                            + tmpxmlsource.getTargetKey() + " / "
318:                            + tmpxslsource.getTargetKey() + ")");
319:                }
320:                // we reset the auxilliary dependencies here, as they will be rebuild now, too 
321:                getAuxDependencyManager().reset();
322:                // as the file will be rebuild in the disc cache, we need to make sure that we will load it again
323:                // when we need it by invalidating the Memcache;
324:                storeValue(null);
325:                //  Ok, the value of the xml and the xsl dependency may still be null
326:                //  (as we defer loading until we actually need the doc, which is now).
327:                //  But the modtime has been taken into account, so those files exists in the disc cache and
328:                //  are up-to-date: getCurrValue() will finally load these values.
329:                Document xmlobj = (Document) ((TargetRW) tmpxmlsource)
330:                        .getCurrValue();
331:                Templates templ = (Templates) ((TargetRW) tmpxslsource)
332:                        .getCurrValue();
333:                if (xmlobj == null)
334:                    throw new XMLException("**** xml source "
335:                            + tmpxmlsource.getTargetKey() + " ("
336:                            + tmpxmlsource.getType()
337:                            + ") doesn't have a value!");
338:                if (templ == null)
339:                    throw new XMLException("**** xsl source "
340:                            + tmpxslsource.getTargetKey() + " ("
341:                            + tmpxslsource.getType()
342:                            + ") doesn't have a value!");
343:                TreeMap<String, Object> tmpparams = getParams();
344:                tmpparams.put("themes", themes.getId());
345:
346:                // Store output in temporary object and overwrite cache file only
347:                // when transformation was sucessfully finished
348:                ByteArrayOutputStream temp = new ByteArrayOutputStream();
349:                Xslt
350:                        .transform(xmlobj, templ, tmpparams, new StreamResult(
351:                                temp));
352:                OutputStream out = cachefile.getOutputStream();
353:                out.write(temp.toByteArray());
354:                out.close();
355:
356:                // Load the target in memcache to make sure all load time
357:                // dependencies are being registered
358:                this .getCurrValue();
359:
360:                // Now we need to save the current value of the auxdependencies
361:                getAuxDependencyManager().saveAuxdepend();
362:                // and let's update the modification time.
363:                setModTime(cachefile.lastModified());
364:                forceupdate = false;
365:            }
366:
367:            public void setForceUpdate() {
368:                forceupdate = true;
369:            }
370:
371:        } // VirtualTarget
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