Source Code Cross Referenced for JarListLoader.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » loader » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server resin 3.1.5 » resin » com.caucho.loader 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003:         *
004:         * This file is part of Resin(R) Open Source
005:         *
006:         * Each copy or derived work must preserve the copyright notice and this
007:         * notice unmodified.
008:         *
009:         * Resin Open Source is free software; you can redistribute it and/or modify
010:         * it under the terms of the GNU General Public License as published by
011:         * the Free Software Foundation; either version 2 of the License, or
012:         * (at your option) any later version.
013:         *
014:         * Resin Open Source is distributed in the hope that it will be useful,
015:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
016:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017:         * of NON-INFRINGEMENT.  See the GNU General Public License for more
018:         * details.
019:         *
020:         * You should have received a copy of the GNU General Public License
021:         * along with Resin Open Source; if not, write to the
022:         *   Free SoftwareFoundation, Inc.
023:         *   59 Temple Place, Suite 330
024:         *   Boston, MA 02111-1307  USA
025:         *
026:         * @author Scott Ferguson
027:         */
028:
029:        package com.caucho.loader;
030:
031:        import com.caucho.config.ConfigException;
032:        import com.caucho.config.types.FileSetType;
033:        import com.caucho.config.types.PathPatternType;
034:        import com.caucho.make.DependencyContainer;
035:        import com.caucho.server.util.CauchoSystem;
036:        import com.caucho.util.CharBuffer;
037:        import com.caucho.vfs.*;
038:
039:        import javax.annotation.PostConstruct;
040:        import java.net.URL;
041:        import java.util.*;
042:        import java.util.logging.Level;
043:        import java.util.logging.Logger;
044:        import java.io.*;
045:        import java.util.zip.*;
046:
047:        /**
048:         * Class loader which checks for changes in class files and automatically
049:         * picks up new jars.
050:         */
051:        abstract public class JarListLoader extends Loader implements 
052:                Dependency {
053:            private static final Logger log = Logger
054:                    .getLogger(JarListLoader.class.getName());
055:
056:            // list of the jars in the directory
057:            protected ArrayList<JarEntry> _jarList;
058:
059:            // list of dependencies
060:            private DependencyContainer _dependencyList = new DependencyContainer();
061:
062:            // Entry map
063:            private HashMap<String, ArrayList<JarEntry>> _pathMap;
064:
065:            /**
066:             * Creates a new jar list loader.
067:             */
068:            public JarListLoader() {
069:                _jarList = new ArrayList<JarEntry>();
070:                _dependencyList = new DependencyContainer();
071:            }
072:
073:            /**
074:             * Initialize
075:             */
076:            protected void init() {
077:            }
078:
079:            /**
080:             * Sets the owning class loader.
081:             */
082:            public void setLoader(DynamicClassLoader loader) {
083:                super .setLoader(loader);
084:
085:                for (int i = 0; i < _jarList.size(); i++)
086:                    loader.addURL(_jarList.get(i).getJarPath());
087:            }
088:
089:            /**
090:             * True if any of the loaded classes have been modified.  If true, the
091:             * caller should drop the classpath and create a new one.
092:             */
093:            public boolean isModified() {
094:                return _dependencyList.isModified();
095:            }
096:
097:            /**
098:             * True if any of the loaded classes have been modified.  If true, the
099:             * caller should drop the classpath and create a new one.
100:             */
101:            public boolean logModified(Logger log) {
102:                return _dependencyList.logModified(log);
103:            }
104:
105:            /**
106:             * Validates the loader.
107:             */
108:            public void validate() throws ConfigException {
109:                for (int i = 0; i < _jarList.size(); i++) {
110:                    _jarList.get(i).validate();
111:                }
112:            }
113:
114:            protected void addJar(Path jar) {
115:                JarPath jarPath = JarPath.create(jar);
116:                JarEntry jarEntry = new JarEntry(jarPath);
117:                _jarList.add(jarEntry);
118:
119:                _dependencyList.add(new Depend(jarPath));
120:
121:                if (getLoader() != null)
122:                    getLoader().addURL(jarPath);
123:
124:                if (_pathMap == null && DynamicClassLoader.isJarCacheEnabled())
125:                    _pathMap = new HashMap<String, ArrayList<JarEntry>>();
126:
127:                if (_pathMap != null) {
128:                    ZipScanner scan = null;
129:
130:                    try {
131:                        HashMap<String, ArrayList<JarEntry>> pathMap = _pathMap;
132:
133:                        boolean isScan = true;
134:                        boolean isValidScan = false;
135:
136:                        try {
137:                            if (isScan && jar.canRead())
138:                                scan = new ZipScanner(jar);
139:
140:                            if (scan != null && scan.open()) {
141:                                while (scan.next()) {
142:                                    String name = scan.getName();
143:
144:                                    ArrayList<JarEntry> entryList = pathMap
145:                                            .get(name);
146:                                    if (entryList == null) {
147:                                        entryList = new ArrayList<JarEntry>();
148:
149:                                        // server/249b
150:                                        /*
151:                                        if (name.endsWith("/"))
152:                                          name = name.substring(0, name.length() - 1);
153:                                         */
154:
155:                                        pathMap.put(name, entryList);
156:                                    }
157:
158:                                    entryList.add(jarEntry);
159:                                }
160:
161:                                isValidScan = true;
162:                            }
163:                        } catch (Exception e) {
164:                            log.log(Level.FINER, e.toString(), e);
165:
166:                            isScan = false;
167:                        }
168:
169:                        if (!isValidScan && jar.canRead()) {
170:                            ZipFile file = new ZipFile(jar.getNativePath());
171:
172:                            Enumeration<? extends ZipEntry> e = file.entries();
173:                            while (e.hasMoreElements()) {
174:                                ZipEntry entry = e.nextElement();
175:                                String name = entry.getName();
176:
177:                                ArrayList<JarEntry> entryList = pathMap
178:                                        .get(name);
179:                                if (entryList == null) {
180:                                    entryList = new ArrayList<JarEntry>();
181:
182:                                    // server/249b
183:                                    /*
184:                                    if (name.endsWith("/"))
185:                                    name = name.substring(0, name.length() - 1);
186:                                     */
187:
188:                                    pathMap.put(name, entryList);
189:                                }
190:
191:                                entryList.add(jarEntry);
192:                            }
193:
194:                            file.close();
195:                        }
196:                    } catch (IOException e) {
197:                        if (jar.canRead())
198:                            log.log(Level.WARNING, e.toString(), e);
199:                        else
200:                            log.log(Level.FINER, e.toString(), e);
201:                    } finally {
202:                        if (scan != null)
203:                            scan.close();
204:                    }
205:                }
206:            }
207:
208:            /**
209:             * Fill data for the class path.  fillClassPath() will add all 
210:             * .jar and .zip files in the directory list.
211:             */
212:            @Override
213:            protected void buildClassPath(ArrayList<String> pathList) {
214:                for (int i = 0; i < _jarList.size(); i++) {
215:                    JarEntry jarEntry = _jarList.get(i);
216:                    JarPath jar = jarEntry.getJarPath();
217:
218:                    String path = jar.getContainer().getNativePath();
219:
220:                    if (!pathList.contains(path))
221:                        pathList.add(path);
222:                }
223:            }
224:
225:            /**
226:             * Returns the class entry.
227:             *
228:             * @param name name of the class
229:             */
230:            protected ClassEntry getClassEntry(String name, String pathName)
231:                    throws ClassNotFoundException {
232:                if (_pathMap != null) {
233:                    ArrayList<JarEntry> jarEntryList = _pathMap.get(pathName);
234:
235:                    if (jarEntryList != null) {
236:                        JarEntry jarEntry = jarEntryList.get(0);
237:
238:                        Path filePath = jarEntry.getJarPath().lookup(pathName);
239:
240:                        return createEntry(name, pathName, jarEntry, filePath);
241:                    }
242:                } else {
243:                    // Find the path corresponding to the class
244:                    for (int i = 0; i < _jarList.size(); i++) {
245:                        JarEntry jarEntry = _jarList.get(i);
246:                        Path path = jarEntry.getJarPath();
247:
248:                        Path filePath = path.lookup(pathName);
249:
250:                        if (filePath.canRead() && filePath.getLength() > 0) {
251:                            return createEntry(name, pathName, jarEntry,
252:                                    filePath);
253:                        }
254:                    }
255:                }
256:
257:                return null;
258:            }
259:
260:            private ClassEntry createEntry(String name, String pathName,
261:                    JarEntry jarEntry, Path filePath) {
262:                String pkg = "";
263:                int p = pathName.lastIndexOf('/');
264:                if (p > 0)
265:                    pkg = pathName.substring(0, p + 1);
266:
267:                ClassEntry entry = new ClassEntry(getLoader(), name, filePath,
268:                        filePath, jarEntry.getCodeSource(pathName));
269:
270:                ClassPackage classPackage = jarEntry.getPackage(pkg);
271:
272:                entry.setClassPackage(classPackage);
273:
274:                return entry;
275:            }
276:
277:            /**
278:             * Adds resources to the enumeration.
279:             */
280:            public void getResources(Vector<URL> vector, String name) {
281:                if (_pathMap != null) {
282:                    ArrayList<JarEntry> jarEntryList = _pathMap.get(name);
283:
284:                    for (int i = 0; jarEntryList != null
285:                            && i < jarEntryList.size(); i++) {
286:                        JarEntry jarEntry = jarEntryList.get(i);
287:                        Path path = jarEntry.getJarPath();
288:
289:                        path = path.lookup(name);
290:
291:                        try {
292:                            URL url = new URL(path.getURL());
293:
294:                            if (!vector.contains(url))
295:                                vector.add(url);
296:                        } catch (Exception e) {
297:                            log.log(Level.WARNING, e.toString(), e);
298:                        }
299:                    }
300:                } else {
301:                    for (int i = 0; i < _jarList.size(); i++) {
302:                        JarEntry jarEntry = _jarList.get(i);
303:                        Path path = jarEntry.getJarPath();
304:
305:                        path = path.lookup(name);
306:
307:                        if (path.exists()) {
308:                            try {
309:                                URL url = new URL(path.getURL());
310:
311:                                if (!vector.contains(url))
312:                                    vector.add(url);
313:                            } catch (Exception e) {
314:                                log.log(Level.WARNING, e.toString(), e);
315:                            }
316:                        }
317:                    }
318:                }
319:            }
320:
321:            /**
322:             * Find a given path somewhere in the classpath
323:             *
324:             * @param pathName the relative resourceName
325:             *
326:             * @return the matching path or null
327:             */
328:            public Path getPath(String pathName) {
329:                if (_pathMap != null) {
330:                    ArrayList<JarEntry> jarEntryList = _pathMap.get(pathName);
331:
332:                    if (jarEntryList != null) {
333:                        return jarEntryList.get(0).getJarPath()
334:                                .lookup(pathName);
335:                    }
336:                } else {
337:                    for (int i = 0; i < _jarList.size(); i++) {
338:                        JarEntry jarEntry = _jarList.get(i);
339:                        Path path = jarEntry.getJarPath();
340:
341:                        Path filePath = path.lookup(pathName);
342:
343:                        if (filePath.exists())
344:                            return filePath;
345:                    }
346:                }
347:
348:                return null;
349:            }
350:
351:            /**
352:             * Closes the jars.
353:             */
354:            protected void clearJars() {
355:                synchronized (this ) {
356:                    ArrayList<JarEntry> jars = new ArrayList<JarEntry>(_jarList);
357:                    _jarList.clear();
358:
359:                    if (_pathMap != null)
360:                        _pathMap.clear();
361:
362:                    for (int i = 0; i < jars.size(); i++) {
363:                        JarEntry jarEntry = jars.get(i);
364:
365:                        JarPath jarPath = jarEntry.getJarPath();
366:
367:                        jarPath.closeJar();
368:                    }
369:                }
370:            }
371:        }
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