Source Code Cross Referenced for ClassEntry.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:         *
023:         *   Free Software Foundation, Inc.
024:         *   59 Temple Place, Suite 330
025:         *   Boston, MA 02111-1307  USA
026:         *
027:         * @author Scott Ferguson
028:         */
029:
030:        package com.caucho.loader;
031:
032:        import com.caucho.log.Log;
033:        import com.caucho.make.DependencyContainer;
034:        import com.caucho.util.ByteBuffer;
035:        import com.caucho.util.QDate;
036:        import com.caucho.vfs.Depend;
037:        import com.caucho.vfs.Dependency;
038:        import com.caucho.vfs.JarPath;
039:        import com.caucho.vfs.Path;
040:        import com.caucho.vfs.PersistentDependency;
041:        import com.caucho.vfs.ReadStream;
042:
043:        import java.io.IOException;
044:        import java.lang.ref.WeakReference;
045:        import java.security.CodeSource;
046:        import java.util.logging.Level;
047:        import java.util.logging.Logger;
048:
049:        /**
050:         * Describes a cached loaded class entry.
051:         */
052:        public class ClassEntry implements  Dependency {
053:            private static final Logger log = Log.open(ClassEntry.class);
054:
055:            private static boolean _hasJNIReload;
056:            private static boolean _hasAnnotations;
057:
058:            private DynamicClassLoader _loader;
059:            private String _name;
060:
061:            private Path _classPath;
062:
063:            private PersistentDependency _depend;
064:
065:            private boolean _classIsModified;
066:
067:            private Path _sourcePath;
068:            private long _sourceLastModified;
069:            private long _sourceLength;
070:
071:            private ClassPackage _classPackage;
072:
073:            private CodeSource _codeSource;
074:
075:            private ClassNotFoundException _exn;
076:
077:            private WeakReference<Class> _clRef;
078:
079:            /**
080:             * Create a loaded class entry
081:             *
082:             * @param name the classname
083:             * @param sourcePath path to the source Java file
084:             * @param classPath path to the compiled class file
085:             */
086:            public ClassEntry(DynamicClassLoader loader, String name,
087:                    Path sourcePath, Path classPath, CodeSource codeSource) {
088:                _loader = loader;
089:                _name = name;
090:
091:                _classPath = classPath;
092:
093:                setDependPath(classPath);
094:
095:                if (sourcePath != null && !sourcePath.equals(classPath)) {
096:                    _sourcePath = sourcePath;
097:
098:                    _sourceLastModified = sourcePath.getLastModified();
099:                    _sourceLength = sourcePath.getLength();
100:                }
101:
102:                _codeSource = codeSource;
103:
104:                /*
105:                if (codePath == null)
106:                  codePath = classPath;
107:
108:                if (_loader.getSecurityManager() != null) {
109:                  try {
110:                    _codeSource = new CodeSource(new URL(codePath.getURL()), null);
111:                  } catch (Exception e) {
112:                    e.printStackTrace();
113:                  }
114:                }
115:                 */
116:            }
117:
118:            /**
119:             * Create a loaded class entry
120:             *
121:             * @param name the classname
122:             * @param sourcePath path to the source Java file
123:             * @param classPath path to the compiled class file
124:             */
125:            public ClassEntry(Loader loader, String name, Path sourcePath,
126:                    Path classPath) {
127:                this (loader.getLoader(), name, sourcePath, classPath, loader
128:                        .getCodeSource(classPath));
129:            }
130:
131:            public String getName() {
132:                return _name;
133:            }
134:
135:            /**
136:             * returns the class loader.
137:             */
138:            public DynamicClassLoader getClassLoader() {
139:                return _loader;
140:            }
141:
142:            public CodeSource getCodeSource() {
143:                return _codeSource;
144:            }
145:
146:            public Path getSourcePath() {
147:                return _sourcePath;
148:            }
149:
150:            /**
151:             * Sets the depend path.
152:             */
153:            protected void setDependPath(Path dependPath) {
154:                if (dependPath instanceof  JarPath)
155:                    _depend = ((JarPath) dependPath).getDepend();
156:                else
157:                    _depend = new Depend(dependPath);
158:            }
159:
160:            /**
161:             * Adds the dependencies, returning true if it's adding itself.
162:             */
163:            protected boolean addDependencies(DependencyContainer container) {
164:                if (_classPath instanceof  JarPath) {
165:                    container.add(_depend);
166:                    return false;
167:                } else if (_hasJNIReload) {
168:                    container.add(this );
169:                    return true;
170:                } else if (_sourcePath == null) {
171:                    container.add(_depend);
172:                    return false;
173:                } else {
174:                    container.add(this );
175:                    return true;
176:                }
177:            }
178:
179:            public void setSourceLength(long length) {
180:                _sourceLength = length;
181:            }
182:
183:            public void setSourceLastModified(long lastModified) {
184:                _sourceLastModified = lastModified;
185:            }
186:
187:            public ClassPackage getClassPackage() {
188:                return _classPackage;
189:            }
190:
191:            public void setClassPackage(ClassPackage pkg) {
192:                _classPackage = pkg;
193:            }
194:
195:            /**
196:             * Returns true if the source file has been modified.
197:             */
198:            public boolean isModified() {
199:                if (_depend.isModified()) {
200:                    if (log.isLoggable(Level.FINE))
201:                        log.fine("class modified: " + _depend);
202:
203:                    return reloadIsModified();
204:                } else if (_sourcePath == null)
205:                    return false;
206:
207:                else if (_sourcePath.getLastModified() != _sourceLastModified) {
208:                    if (log.isLoggable(Level.FINE))
209:                        log.fine("source modified time: "
210:                                + _sourcePath
211:                                + " old:"
212:                                + QDate.formatLocal(_sourceLastModified)
213:                                + " new:"
214:                                + QDate.formatLocal(_sourcePath
215:                                        .getLastModified()));
216:
217:                    if (!compileIsModified()) {
218:                        return false;
219:                    }
220:
221:                    boolean isModified = reloadIsModified();
222:
223:                    return isModified;
224:                } else if (_sourcePath.getLength() != _sourceLength) {
225:                    if (log.isLoggable(Level.FINE))
226:                        log.fine("source modified length: " + _sourcePath
227:                                + " old:" + _sourceLength + " new:"
228:                                + _sourcePath.getLength());
229:
230:                    if (!compileIsModified())
231:                        return false;
232:
233:                    return reloadIsModified();
234:                } else {
235:                    return false;
236:                }
237:            }
238:
239:            /**
240:             * Returns true if the source file has been modified.
241:             */
242:            public boolean logModified(Logger log) {
243:                if (_depend.logModified(log)) {
244:                    return true;
245:                } else if (_sourcePath == null)
246:                    return false;
247:
248:                else if (_sourcePath.getLastModified() != _sourceLastModified) {
249:                    log.info("source modified time: " + _sourcePath + " old:"
250:                            + QDate.formatLocal(_sourceLastModified) + " new:"
251:                            + QDate.formatLocal(_sourcePath.getLastModified()));
252:
253:                    return true;
254:                } else if (_sourcePath.getLength() != _sourceLength) {
255:                    log
256:                            .info("source modified length: " + _sourcePath
257:                                    + " old:" + _sourceLength + " new:"
258:                                    + _sourcePath.getLength());
259:
260:                    return true;
261:                } else {
262:                    return false;
263:                }
264:            }
265:
266:            /**
267:             * Returns true if the compile doesn't avoid the dependency.
268:             */
269:            public boolean compileIsModified() {
270:                return true;
271:            }
272:
273:            /**
274:             * Returns true if the reload doesn't avoid the dependency.
275:             */
276:            public boolean reloadIsModified() {
277:                if (_classIsModified) {
278:                    return true;
279:                }
280:
281:                if (!_hasJNIReload || !_classPath.canRead()) {
282:                    return true;
283:                }
284:
285:                try {
286:                    long length = _classPath.getLength();
287:
288:                    Class cl = _clRef != null ? _clRef.get() : null;
289:
290:                    if (cl == null) {
291:                        return false;
292:                    }
293:
294:                    if (_hasAnnotations && requireReload(cl))
295:                        return true;
296:
297:                    ReadStream is = _classPath.openRead();
298:
299:                    byte[] bytecode = new byte[(int) length];
300:
301:                    try {
302:                        is.readAll(bytecode, 0, bytecode.length);
303:                    } finally {
304:                        is.close();
305:                    }
306:
307:                    int result = reloadNative(cl, bytecode, 0, bytecode.length);
308:
309:                    if (result != 0) {
310:                        _classIsModified = true;
311:                        return true;
312:                    }
313:
314:                    setDependPath(_classPath);
315:
316:                    if (_sourcePath != null) {
317:                        _sourceLastModified = _sourcePath.getLastModified();
318:                        _sourceLength = _sourcePath.getLength();
319:                    }
320:
321:                    log.info("Reloading " + cl.getName());
322:
323:                    return false;
324:                } catch (Exception e) {
325:                    log.log(Level.WARNING, e.toString(), e);
326:                    _classIsModified = true;
327:
328:                    return true;
329:                }
330:            }
331:
332:            /**
333:             * Returns the path to the class file.
334:             */
335:            public Path getClassPath() {
336:                return _classPath;
337:            }
338:
339:            public Class getEntryClass() {
340:                return _clRef != null ? _clRef.get() : null;
341:            }
342:
343:            public void setEntryClass(Class cl) {
344:                _clRef = new WeakReference<Class>(cl);
345:            }
346:
347:            /**
348:             * preload actions.
349:             */
350:            public void preLoad() throws ClassNotFoundException {
351:            }
352:
353:            /**
354:             * Loads the contents of the class file into the buffer.
355:             */
356:            public void load(ByteBuffer buffer) throws IOException {
357:                synchronized (this ) {
358:                    Path classPath = getClassPath();
359:
360:                    buffer.clear();
361:                    long length = classPath.getLength();
362:                    if (length < 0)
363:                        throw new IOException("missing class: " + classPath);
364:                    ReadStream is = classPath.openRead();
365:                    try {
366:                        buffer.setLength((int) length);
367:                        if (is.readAll(buffer.getBuffer(), 0, (int) length) != length)
368:                            throw new IOException("class file length mismatch");
369:                    } finally {
370:                        is.close();
371:                    }
372:                }
373:            }
374:
375:            /**
376:             * post-load actions.
377:             */
378:            public boolean postLoad() {
379:                return false;
380:            }
381:
382:            public static boolean hasJNIReload() {
383:                return _hasJNIReload;
384:            }
385:
386:            private static boolean requireReload(Class cl) {
387:                return cl.isAnnotationPresent(RequireReload.class);
388:            }
389:
390:            public String toString() {
391:                if (_sourcePath == null)
392:                    return "ClassEntry[" + _classPath + "]";
393:                else
394:                    return "ClassEntry[" + _classPath + ", src=" + _sourcePath
395:                            + "]";
396:            }
397:
398:            public static native boolean canReloadNative();
399:
400:            public static native int reloadNative(Class cl, byte[] bytes,
401:                    int offset, int length);
402:
403:            class ReloadThread implements  Runnable {
404:                private volatile boolean _isDone;
405:
406:                public boolean isDone() {
407:                    return _isDone;
408:                }
409:
410:                public void run() {
411:                }
412:            }
413:
414:            static {
415:                try {
416:                    System.loadLibrary("resin_os");
417:                    _hasJNIReload = canReloadNative();
418:                    if (_hasJNIReload)
419:                        log
420:                                .config("In-place class redefinition (HotSwap) is available.");
421:                    else
422:                        log
423:                                .config("In-place class redefinition (HotSwap) is not available.  In-place class reloading during development requires a compatible JDK and -Xdebug.");
424:                } catch (Throwable e) {
425:                    log.fine(e.toString());
426:
427:                    log.log(Level.FINEST, e.toString(), e);
428:                    // log.config("In-place class redefinition (HotSwap) is not available.\n" + e);
429:                }
430:
431:                try {
432:                    Class reloadClass = Class
433:                            .forName("com.caucho.loader.RequireReload");
434:
435:                    Object.class.getAnnotation(reloadClass);
436:
437:                    _hasAnnotations = true;
438:                } catch (Throwable e) {
439:                }
440:            }
441:        }
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