Source Code Cross Referenced for PackageCompilationData.java in  » Rule-Engine » drolls-Rule-Engine » org » drools » rule » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Rule Engine » drolls Rule Engine » org.drools.rule 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.drools.rule;
002:
003:        /*
004:         * Copyright 2005 JBoss Inc
005:         *
006:         * Licensed under the Apache License, Version 2.0 (the "License");
007:         * you may not use this file except in compliance with the License.
008:         * You may obtain a copy of the License at
009:         *
010:         *      http://www.apache.org/licenses/LICENSE-2.0
011:         *
012:         * Unless required by applicable law or agreed to in writing, software
013:         * distributed under the License is distributed on an "AS IS" BASIS,
014:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015:         * See the License for the specific language governing permissions and
016:         * limitations under the License.
017:         */
018:
019:        import java.io.ByteArrayInputStream;
020:        import java.io.ByteArrayOutputStream;
021:        import java.io.Externalizable;
022:        import java.io.IOException;
023:        import java.io.InputStream;
024:        import java.io.ObjectInput;
025:        import java.io.ObjectOutput;
026:        import java.io.ObjectOutputStream;
027:        import java.security.AccessController;
028:        import java.security.PrivilegedAction;
029:        import java.security.ProtectionDomain;
030:        import java.util.ArrayList;
031:        import java.util.Collections;
032:        import java.util.HashMap;
033:        import java.util.Iterator;
034:        import java.util.List;
035:        import java.util.Map;
036:        import java.util.Map.Entry;
037:
038:        import org.drools.CheckedDroolsException;
039:        import org.drools.RuntimeDroolsException;
040:        import org.drools.base.ClassFieldExtractorFactory;
041:        import org.drools.base.accumulators.JavaAccumulatorFunctionExecutor;
042:        import org.drools.common.DroolsObjectInputStream;
043:        import org.drools.spi.Accumulator;
044:        import org.drools.spi.Consequence;
045:        import org.drools.spi.EvalExpression;
046:        import org.drools.spi.PredicateExpression;
047:        import org.drools.spi.ReturnValueExpression;
048:
049:        public class PackageCompilationData implements  Externalizable {
050:
051:            /**
052:             *
053:             */
054:            private static final long serialVersionUID = 400L;
055:
056:            private static final ProtectionDomain PROTECTION_DOMAIN;
057:
058:            private Map invokerLookups;
059:
060:            private Object AST;
061:
062:            private Map store;
063:
064:            private Map lineMappings;
065:
066:            private transient PackageClassLoader classLoader;
067:
068:            private transient ClassLoader parentClassLoader;
069:
070:            private boolean dirty;
071:
072:            static {
073:                PROTECTION_DOMAIN = (ProtectionDomain) AccessController
074:                        .doPrivileged(new PrivilegedAction() {
075:                            public Object run() {
076:                                return PackageCompilationData.class
077:                                        .getProtectionDomain();
078:                            }
079:                        });
080:            }
081:
082:            /**
083:             * Default constructor - for Externalizable. This should never be used by a user, as it
084:             * will result in an invalid state for the instance.
085:             */
086:            public PackageCompilationData() {
087:
088:            }
089:
090:            public PackageCompilationData(final ClassLoader parentClassLoader) {
091:                initClassLoader(parentClassLoader);
092:                this .invokerLookups = new HashMap();
093:                this .store = new HashMap();
094:                this .lineMappings = new HashMap();
095:                this .dirty = false;
096:            }
097:
098:            public boolean isDirty() {
099:                return this .dirty;
100:            }
101:
102:            private void initClassLoader(ClassLoader parentClassLoader) {
103:                if (parentClassLoader == null) {
104:                    throw new RuntimeDroolsException(
105:                            "PackageCompilationData cannot have a null parentClassLoader");
106:                }
107:                this .parentClassLoader = parentClassLoader;
108:                this .classLoader = new PackageClassLoader(
109:                        this .parentClassLoader);
110:            }
111:
112:            /**
113:             * Handles the write serialization of the PackageCompilationData. Patterns in Rules may reference generated data which cannot be serialized by
114:             * default methods. The PackageCompilationData holds a reference to the generated bytecode. The generated bytecode must be restored before any Rules.
115:             *
116:             */
117:            public void writeExternal(final ObjectOutput stream)
118:                    throws IOException {
119:                stream.writeObject(this .store);
120:                stream.writeObject(this .AST);
121:
122:                // Rules must be restored by an ObjectInputStream that can resolve using a given ClassLoader to handle seaprately by storing as
123:                // a byte[]
124:                final ByteArrayOutputStream bos = new ByteArrayOutputStream();
125:                final ObjectOutput out = new ObjectOutputStream(bos);
126:                out.writeObject(this .invokerLookups);
127:                stream.writeObject(bos.toByteArray());
128:            }
129:
130:            /**
131:             * Handles the read serialization of the PackageCompilationData. Patterns in Rules may reference generated data which cannot be serialized by
132:             * default methods. The PackageCompilationData holds a reference to the generated bytecode; which must be restored before any Rules.
133:             * A custom ObjectInputStream, able to resolve classes against the bytecode, is used to restore the Rules.
134:             *
135:             */
136:            public void readExternal(final ObjectInput stream)
137:                    throws IOException, ClassNotFoundException {
138:                if (stream instanceof  DroolsObjectInputStream) {
139:                    DroolsObjectInputStream droolsStream = (DroolsObjectInputStream) stream;
140:                    initClassLoader(droolsStream.getClassLoader());
141:                } else {
142:                    initClassLoader(Thread.currentThread()
143:                            .getContextClassLoader());
144:                }
145:
146:                this .store = (Map) stream.readObject();
147:                this .AST = stream.readObject();
148:
149:                // Return the rules stored as a byte[]
150:                final byte[] bytes = (byte[]) stream.readObject();
151:
152:                //  Use a custom ObjectInputStream that can resolve against a given classLoader
153:                final DroolsObjectInputStream streamWithLoader = new DroolsObjectInputStream(
154:                        new ByteArrayInputStream(bytes), this .classLoader);
155:                this .invokerLookups = (Map) streamWithLoader.readObject();
156:            }
157:
158:            public ClassLoader getClassLoader() {
159:                return this .classLoader;
160:            }
161:
162:            public byte[] read(final String resourceName) {
163:                byte[] bytes = null;
164:
165:                if (this .store != null) {
166:                    bytes = (byte[]) this .store.get(resourceName);
167:                }
168:                return bytes;
169:            }
170:
171:            public void write(final String resourceName, final byte[] clazzData)
172:                    throws RuntimeDroolsException {
173:                if (this .store.put(resourceName, clazzData) != null) {
174:                    // we are updating an existing class so reload();
175:                    //reload();
176:                    this .dirty = true;
177:                } else {
178:                    try {
179:                        wire(convertResourceToClassName(resourceName));
180:                    } catch (final Exception e) {
181:                        e.printStackTrace();
182:                        throw new RuntimeDroolsException(e);
183:                    }
184:                }
185:
186:            }
187:
188:            public boolean remove(final String resourceName)
189:                    throws RuntimeDroolsException {
190:                this .invokerLookups.remove(resourceName);
191:                if (this .store.remove(convertClassToResourcePath(resourceName)) != null) {
192:                    // we need to make sure the class is removed from the classLoader
193:                    // reload();
194:                    this .dirty = true;
195:                    return true;
196:                }
197:                return false;
198:            }
199:
200:            public String[] list() {
201:                if (this .store == null) {
202:                    return new String[0];
203:                }
204:                final List names = new ArrayList();
205:
206:                for (final Iterator it = this .store.keySet().iterator(); it
207:                        .hasNext();) {
208:                    final String name = (String) it.next();
209:                    names.add(name);
210:                }
211:
212:                return (String[]) names.toArray(new String[this .store.size()]);
213:            }
214:
215:            /**
216:             * This class drops the classLoader and reloads it. During this process  it must re-wire all the invokeables.
217:             * @throws CheckedDroolsException
218:             */
219:            public void reload() throws RuntimeDroolsException {
220:                // drops the classLoader and adds a new one
221:                this .classLoader = new PackageClassLoader(
222:                        this .parentClassLoader);
223:
224:                // Wire up invokers
225:                try {
226:                    for (final Iterator it = this .invokerLookups.entrySet()
227:                            .iterator(); it.hasNext();) {
228:                        Entry entry = (Entry) it.next();
229:                        wire((String) entry.getKey(), entry.getValue());
230:                    }
231:                } catch (final ClassNotFoundException e) {
232:                    throw new RuntimeDroolsException(e);
233:                } catch (final InstantiationError e) {
234:                    throw new RuntimeDroolsException(e);
235:                } catch (final IllegalAccessException e) {
236:                    throw new RuntimeDroolsException(e);
237:                } catch (final InstantiationException e) {
238:                    throw new RuntimeDroolsException(e);
239:                } finally {
240:                    this .dirty = false;
241:                }
242:            }
243:
244:            public void clear() {
245:                this .store.clear();
246:                this .invokerLookups.clear();
247:                this .AST = null;
248:                reload();
249:            }
250:
251:            public void wire(final String className)
252:                    throws ClassNotFoundException, InstantiationException,
253:                    IllegalAccessException {
254:                final Object invoker = this .invokerLookups.get(className);
255:                wire(className, invoker);
256:            }
257:
258:            public void wire(final String className, final Object invoker)
259:                    throws ClassNotFoundException, InstantiationException,
260:                    IllegalAccessException {
261:                final Class clazz = this .classLoader.findClass(className);
262:                if (invoker instanceof  ReturnValueRestriction) {
263:                    ((ReturnValueRestriction) invoker)
264:                            .setReturnValueExpression((ReturnValueExpression) clazz
265:                                    .newInstance());
266:                } else if (invoker instanceof  PredicateConstraint) {
267:                    ((PredicateConstraint) invoker)
268:                            .setPredicateExpression((PredicateExpression) clazz
269:                                    .newInstance());
270:                } else if (invoker instanceof  EvalCondition) {
271:                    ((EvalCondition) invoker)
272:                            .setEvalExpression((EvalExpression) clazz
273:                                    .newInstance());
274:                } else if (invoker instanceof  Accumulate) {
275:                    ((Accumulate) invoker).setAccumulator((Accumulator) clazz
276:                            .newInstance());
277:                } else if (invoker instanceof  Rule) {
278:                    ((Rule) invoker).setConsequence((Consequence) clazz
279:                            .newInstance());
280:                } else if (invoker instanceof  JavaAccumulatorFunctionExecutor) {
281:                    ((JavaAccumulatorFunctionExecutor) invoker)
282:                            .setExpression((ReturnValueExpression) clazz
283:                                    .newInstance());
284:                }
285:            }
286:
287:            public String toString() {
288:                return this .getClass().getName() + this .store.toString();
289:            }
290:
291:            public void putInvoker(final String className, final Object invoker) {
292:                this .invokerLookups.put(className, invoker);
293:            }
294:
295:            public void putAllInvokers(final Map invokers) {
296:                this .invokerLookups.putAll(invokers);
297:
298:            }
299:
300:            public Map getInvokers() {
301:                return this .invokerLookups;
302:            }
303:
304:            public void removeInvoker(final String className) {
305:                this .invokerLookups.remove(className);
306:            }
307:
308:            public Map getLineMappings() {
309:                if (this .lineMappings == null) {
310:                    this .lineMappings = new HashMap();
311:                }
312:                return this .lineMappings;
313:            }
314:
315:            public LineMappings getLineMappings(final String className) {
316:                return (LineMappings) getLineMappings().get(className);
317:            }
318:
319:            public Object getAST() {
320:                return this .AST;
321:            }
322:
323:            public void setAST(final Object ast) {
324:                this .AST = ast;
325:            }
326:
327:            /**
328:             * Lifted and adapted from Jakarta commons-jci
329:             *
330:             * @author mproctor
331:             *
332:             */
333:            public class PackageClassLoader extends ClassLoader implements 
334:                    DroolsClassLoader {
335:
336:                public PackageClassLoader(final ClassLoader parentClassLoader) {
337:                    super (parentClassLoader);
338:                }
339:
340:                public Class fastFindClass(final String name) {
341:                    final Class clazz = findLoadedClass(name);
342:
343:                    if (clazz == null) {
344:                        final byte[] clazzBytes = read(convertClassToResourcePath(name));
345:                        if (clazzBytes != null) {
346:                            return defineClass(name, clazzBytes, 0,
347:                                    clazzBytes.length, PROTECTION_DOMAIN);
348:                        }
349:                    }
350:
351:                    return clazz;
352:                }
353:
354:                /**
355:                 * Javadocs recommend that this method not be overloaded. We overload this so that we can prioritise the fastFindClass
356:                 * over method calls to parent.loadClass(name, false); and c = findBootstrapClass0(name); which the default implementation
357:                 * would first - hence why we call it "fastFindClass" instead of standard findClass, this indicates that we give it a
358:                 * higher priority than normal.
359:                 *
360:                 */
361:                protected synchronized Class loadClass(final String name,
362:                        final boolean resolve) throws ClassNotFoundException {
363:                    Class clazz = fastFindClass(name);
364:
365:                    if (clazz == null) {
366:                        final ClassLoader parent = getParent();
367:                        if (parent != null) {
368:                            clazz = parent.loadClass(name);
369:                        } else {
370:                            throw new ClassNotFoundException(name);
371:                        }
372:                    }
373:
374:                    if (resolve) {
375:                        resolveClass(clazz);
376:                    }
377:
378:                    return clazz;
379:                }
380:
381:                protected Class findClass(final String name)
382:                        throws ClassNotFoundException {
383:                    final Class clazz = fastFindClass(name);
384:                    if (clazz == null) {
385:                        throw new ClassNotFoundException(name);
386:                    }
387:                    return clazz;
388:                }
389:
390:                public InputStream getResourceAsStream(final String name) {
391:                    final byte[] bytes = (byte[]) PackageCompilationData.this .store
392:                            .get(name);
393:                    if (bytes != null) {
394:                        return new ByteArrayInputStream(bytes);
395:                    } else {
396:                        InputStream input = this .getParent()
397:                                .getResourceAsStream(name);
398:                        if (input == null) {
399:                            input = super .getResourceAsStream(name);
400:                        }
401:                        return input;
402:                    }
403:                }
404:            }
405:
406:            /**
407:             * Please do not use - internal
408:             * org/my/Class.xxx -> org.my.Class
409:             */
410:            public static String convertResourceToClassName(
411:                    final String pResourceName) {
412:                return stripExtension(pResourceName).replace('/', '.');
413:            }
414:
415:            /**
416:             * Please do not use - internal
417:             * org.my.Class -> org/my/Class.class
418:             */
419:            public static String convertClassToResourcePath(final String pName) {
420:                return pName.replace('.', '/') + ".class";
421:            }
422:
423:            /**
424:             * Please do not use - internal
425:             * org/my/Class.xxx -> org/my/Class
426:             */
427:            public static String stripExtension(final String pResourceName) {
428:                final int i = pResourceName.lastIndexOf('.');
429:                final String withoutExtension = pResourceName.substring(0, i);
430:                return withoutExtension;
431:            }
432:
433:        }
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