Source Code Cross Referenced for AbstractReplicatedStore.java in  » Sevlet-Container » jetty-extras » org » mortbay » j2ee » session » Java Source Code / Java DocumentationJava Source Code and Java Documentation

Java Source Code / Java Documentation
1. 6.0 JDK Core
2. 6.0 JDK Modules
3. 6.0 JDK Modules com.sun
4. 6.0 JDK Modules com.sun.java
5. 6.0 JDK Modules sun
6. 6.0 JDK Platform
7. Ajax
8. Apache Harmony Java SE
9. Aspect oriented
10. Authentication Authorization
11. Blogger System
12. Build
13. Byte Code
14. Cache
15. Chart
16. Chat
17. Code Analyzer
18. Collaboration
19. Content Management System
20. Database Client
21. Database DBMS
22. Database JDBC Connection Pool
23. Database ORM
24. Development
25. EJB Server geronimo
26. EJB Server GlassFish
27. EJB Server JBoss 4.2.1
28. EJB Server resin 3.1.5
29. ERP CRM Financial
30. ESB
31. Forum
32. GIS
33. Graphic Library
34. Groupware
35. HTML Parser
36. IDE
37. IDE Eclipse
38. IDE Netbeans
39. Installer
40. Internationalization Localization
41. Inversion of Control
42. Issue Tracking
43. J2EE
44. JBoss
45. JMS
46. JMX
47. Library
48. Mail Clients
49. Net
50. Parser
51. PDF
52. Portal
53. Profiler
54. Project Management
55. Report
56. RSS RDF
57. Rule Engine
58. Science
59. Scripting
60. Search Engine
61. Security
62. Sevlet Container
63. Source Control
64. Swing Library
65. Template Engine
66. Test Coverage
67. Testing
68. UML
69. Web Crawler
70. Web Framework
71. Web Mail
72. Web Server
73. Web Services
74. Web Services apache cxf 2.0.1
75. Web Services AXIS2
76. Wiki Engine
77. Workflow Engines
78. XML
79. XML UI
Java
Java Tutorial
Java Open Source
Jar File Download
Java Articles
Java Products
Java by API
Photoshop Tutorials
Maya Tutorials
Flash Tutorials
3ds-Max Tutorials
Illustrator Tutorials
GIMP Tutorials
C# / C Sharp
C# / CSharp Tutorial
C# / CSharp Open Source
ASP.Net
ASP.NET Tutorial
JavaScript DHTML
JavaScript Tutorial
JavaScript Reference
HTML / CSS
HTML CSS Reference
C / ANSI-C
C Tutorial
C++
C++ Tutorial
Ruby
PHP
Python
Python Tutorial
Python Open Source
SQL Server / T-SQL
SQL Server / T-SQL Tutorial
Oracle PL / SQL
Oracle PL/SQL Tutorial
PostgreSQL
SQL / MySQL
MySQL Tutorial
VB.Net
VB.Net Tutorial
Flash / Flex / ActionScript
VBA / Excel / Access / Word
XML
XML Tutorial
Microsoft Office PowerPoint 2007 Tutorial
Microsoft Office Excel 2007 Tutorial
Microsoft Office Word 2007 Tutorial
Java Source Code / Java Documentation » Sevlet Container » jetty extras » org.mortbay.j2ee.session 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // ========================================================================
002:        // $Id: AbstractReplicatedStore.java,v 1.5 2004/06/22 16:23:44 jules_gosnell Exp $
003:        // Copyright 2002-2004 Mort Bay Consulting Pty. Ltd.
004:        // ------------------------------------------------------------------------
005:        // Licensed under the Apache License, Version 2.0 (the "License");
006:        // you may not use this file except in compliance with the License.
007:        // You may obtain a copy of the License at
008:        // http://www.apache.org/licenses/LICENSE-2.0
009:        // Unless required by applicable law or agreed to in writing, software
010:        // distributed under the License is distributed on an "AS IS" BASIS,
011:        // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012:        // See the License for the specific language governing permissions and
013:        // limitations under the License.
014:        // ========================================================================
015:
016:        package org.mortbay.j2ee.session;
017:
018:        //----------------------------------------
019:
020:        import java.lang.reflect.Method;
021:        import java.util.ArrayList;
022:        import java.util.Collection;
023:        import java.util.HashMap;
024:        import java.util.Iterator;
025:        import java.util.Map;
026:
027:        import org.jboss.logging.Logger;
028:
029:        //----------------------------------------
030:
031:        // implement scavenging
032:        // implement setMaxInactiveInterval
033:        // look for NYI/TODO
034:
035:        // this infrastructure could probably be used across JMS aswell -
036:        // think about it...
037:
038:        /**
039:         * Maintain synchronisation with other States representing the same session by
040:         * publishing changes made to ourself and updating ourself according to
041:         * notifications published by the other State objects.
042:         * 
043:         * @author <a href="mailto:jules@mortbay.com">Jules Gosnell</a>
044:         * @version 1.0
045:         */
046:
047:        abstract public class AbstractReplicatedStore extends AbstractStore {
048:            protected final static Logger _log = Logger
049:                    .getLogger(AbstractReplicatedStore.class);
050:
051:            protected ClassLoader _loader;
052:
053:            public AbstractReplicatedStore() {
054:                super ();
055:                _loader = Thread.currentThread().getContextClassLoader();
056:            }
057:
058:            public ClassLoader getLoader() {
059:                return _loader;
060:            }
061:
062:            public void setLoader(ClassLoader loader) {
063:                _loader = loader;
064:            }
065:
066:            // ----------------------------------------
067:            // tmp hack to prevent infinite loop
068:            private final static ThreadLocal _replicating = new ThreadLocal();
069:
070:            public static boolean getReplicating() {
071:                return _replicating.get() == Boolean.TRUE;
072:            }
073:
074:            public static void setReplicating(boolean replicating) {
075:                _replicating.set(replicating ? Boolean.TRUE : Boolean.FALSE);
076:            }
077:
078:            // ----------------------------------------
079:
080:            public Object clone() {
081:                AbstractReplicatedStore ars = (AbstractReplicatedStore) super 
082:                        .clone();
083:                ars.setLoader(getLoader());
084:                return ars;
085:            }
086:
087:            protected Map _sessions = new HashMap();
088:
089:            public int getSessions() {
090:                return _sessions.size();
091:            }
092:
093:            // ----------------------------------------
094:            // Store API - Store LifeCycle
095:
096:            public void destroy() // corresponds to ctor
097:            {
098:                _log.trace("destroying...");
099:                _sessions.clear();
100:                _sessions = null;
101:                setManager(null);
102:                super .destroy();
103:                _log.trace("...destroyed");
104:            }
105:
106:            // ----------------------------------------
107:            // Store API - State LifeCycle
108:
109:            public State newState(String id, int maxInactiveInterval)
110:                    throws Exception {
111:                long creationTime = System.currentTimeMillis();
112:
113:                if (!AbstractReplicatedStore.getReplicating()) {
114:                    Object[] argInstances = { id, new Long(creationTime),
115:                            new Integer(maxInactiveInterval),
116:                            new Integer(_actualMaxInactiveInterval) };
117:                    publish(null, CREATE_SESSION, argInstances);
118:                }
119:
120:                createSession(id, creationTime, maxInactiveInterval,
121:                        _actualMaxInactiveInterval);
122:
123:                // if we get one - all we have to do is loadState - because we
124:                // will have just created it...
125:                return loadState(id);
126:            }
127:
128:            public State loadState(String id) {
129:                // pull it out of our cache - if it is not there, it doesn't
130:                // exist/hasn't been distributed...
131:
132:                Object tmp;
133:                synchronized (_sessions) {
134:                    tmp = _sessions.get(id);
135:                }
136:                return (State) tmp;
137:            }
138:
139:            public void storeState(State state) {
140:                try {
141:                    String id = state.getId();
142:                    synchronized (_sessions) {
143:                        _sessions.put(id, state);
144:                    }
145:                } catch (Exception e) {
146:                    _log.error("error storing session", e);
147:                }
148:            }
149:
150:            public void removeState(State state) throws Exception {
151:                String id = state.getId();
152:
153:                if (!AbstractReplicatedStore.getReplicating()) {
154:                    Object[] argInstances = { id };
155:                    publish(null, DESTROY_SESSION, argInstances);
156:                }
157:
158:                destroySession(id);
159:            }
160:
161:            // ----------------------------------------
162:            // Store API - garbage collection
163:
164:            public void scavenge() throws Exception {
165:                _log.trace("starting distributed scavenging...");
166:                Collection copy;
167:                synchronized (_sessions) {
168:                    copy = new ArrayList(_sessions.values());
169:                }
170:                if (_log.isTraceEnabled()) {
171:                    int n;
172:                    synchronized (_subscribers) {
173:                        n = _subscribers.size();
174:                    }
175:                    _log.trace(copy.size() + " distributed sessions, " + n
176:                            + " subscribers");
177:                }
178:                int n = 0;
179:                for (Iterator i = copy.iterator(); i.hasNext();) {
180:                    LocalState state = (LocalState) i.next();
181:                    if (!state.isValid(_scavengerExtraTime)) {
182:                        String id = state.getId();
183:                        if (_log.isDebugEnabled())
184:                            _log.debug("scavenging distributed session " + id);
185:                        destroySession(id);
186:                        i.remove();
187:                        ++n;
188:                    }
189:                }
190:                if (_log.isTraceEnabled())
191:                    _log.trace("scavenged " + n + " distributed sessions");
192:                _log.trace("...finished distributed scavenging");
193:            }
194:
195:            // ----------------------------------------
196:            // Store API - hacks... - NYI/TODO
197:
198:            public void passivateSession(StateAdaptor sa) {
199:            }
200:
201:            public boolean isDistributed() {
202:                return true;
203:            }
204:
205:            // ----------------------------------------
206:            // utils
207:
208:            public String getContextPath() {
209:                return getManager().getContextPath();
210:            }
211:
212:            // ----------------------------------------
213:            // change notification API
214:
215:            protected static Map _methodToInteger = new HashMap();
216:
217:            protected static Method[] _integerToMethod = new Method[8];
218:
219:            protected static Method CREATE_SESSION;
220:
221:            protected static Method DESTROY_SESSION;
222:
223:            protected static Method TOUCH_SESSIONS;
224:
225:            protected static Method SET_LAST_ACCESSED_TIME;
226:
227:            static {
228:                // this is absolutely horrible and will break if anyone changes
229:                // the shape of the interface - but it is a quick, easy and
230:                // efficient hack - so I am using it while I think of a better
231:                // way...
232:                try {
233:                    int index = 0;
234:                    Method m = null;
235:
236:                    // class methods...
237:                    m = CREATE_SESSION = AbstractReplicatedStore.class
238:                            .getMethod("createSession", new Class[] {
239:                                    String.class, Long.TYPE, Integer.TYPE,
240:                                    Integer.TYPE });
241:                    _integerToMethod[index] = m;
242:                    _methodToInteger.put(m.getName(), new Integer(index));
243:                    index++;
244:
245:                    m = DESTROY_SESSION = AbstractReplicatedStore.class
246:                            .getMethod("destroySession",
247:                                    new Class[] { String.class });
248:                    _integerToMethod[index] = m;
249:                    _methodToInteger.put(m.getName(), new Integer(index));
250:                    index++;
251:
252:                    m = TOUCH_SESSIONS = AbstractReplicatedStore.class
253:                            .getMethod("touchSessions", new Class[] {
254:                                    String[].class, Long.TYPE });
255:                    _integerToMethod[index] = m;
256:                    _methodToInteger.put(m.getName(), new Integer(index));
257:                    index++;
258:
259:                    // instance methods...
260:                    m = SET_LAST_ACCESSED_TIME = State.class.getMethod(
261:                            "setLastAccessedTime", new Class[] { Long.TYPE });
262:                    _integerToMethod[index] = m;
263:                    _methodToInteger.put(m.getName(), new Integer(index));
264:                    index++;
265:
266:                    m = State.class.getMethod("setMaxInactiveInterval",
267:                            new Class[] { Integer.TYPE });
268:                    _integerToMethod[index] = m;
269:                    _methodToInteger.put(m.getName(), new Integer(index));
270:                    index++;
271:
272:                    m = State.class.getMethod("setAttribute", new Class[] {
273:                            String.class, Object.class, Boolean.TYPE });
274:                    _integerToMethod[index] = m;
275:                    _methodToInteger.put(m.getName(), new Integer(index));
276:                    index++;
277:
278:                    m = State.class.getMethod("setAttributes",
279:                            new Class[] { Map.class });
280:                    _integerToMethod[index] = m;
281:                    _methodToInteger.put(m.getName(), new Integer(index));
282:                    index++;
283:
284:                    m = State.class.getMethod("removeAttribute", new Class[] {
285:                            String.class, Boolean.TYPE });
286:                    _integerToMethod[index] = m;
287:                    _methodToInteger.put(m.getName(), new Integer(index));
288:                    index++;
289:                } catch (Exception e) {
290:                    System.err
291:                            .println("AbstractReplicatedStore: something went wrong building dispatch tables");
292:                    e.printStackTrace(System.err);
293:                }
294:            }
295:
296:            abstract protected void publish(String id, Method method,
297:                    Object[] argInstances);
298:
299:            protected void dispatch(String id, Integer methodId,
300:                    Object[] argInstances) {
301:                try {
302:                    AbstractReplicatedStore.setReplicating(true);
303:
304:                    Object target = null;
305:                    if (id == null) {
306:                        // either this is a class method
307:                        target = this ;
308:                    } else {
309:                        // or an instance method..
310:                        synchronized (_subscribers) {
311:                            target = _subscribers.get(id);
312:                        }
313:                    }
314:
315:                    try {
316:                        Method method = _integerToMethod[methodId.intValue()];
317:                        if (target == null)
318:                            _log.warn("null target for " + method);
319:                        else
320:                            method.invoke(target, argInstances);
321:                    } catch (Exception e) {
322:                        _log
323:                                .error(
324:                                        "this should never happen - code version mismatch ?",
325:                                        e);
326:                    }
327:                } finally {
328:                    AbstractReplicatedStore.setReplicating(false);
329:                }
330:            }
331:
332:            public void createSession(String id, long creationTime,
333:                    int maxInactiveInterval, int actualMaxInactiveInterval) {
334:                if (_log.isTraceEnabled())
335:                    _log.trace("creating replicated session: " + id);
336:                State state = new LocalState(id, creationTime,
337:                        maxInactiveInterval, actualMaxInactiveInterval);
338:                synchronized (_sessions) {
339:                    _sessions.put(id, state);
340:                }
341:
342:                if (AbstractReplicatedStore.getReplicating()) {
343:                    //	_log.info("trying to promote replicated session");
344:                    getManager().getHttpSession(id); // should cause creation of corresponding InterceptorStack
345:                }
346:            }
347:
348:            public void destroySession(String id) {
349:                if (_log.isTraceEnabled())
350:                    _log.trace("destroying replicated session: " + id);
351:                if (getManager().sessionExists(id))
352:                    getManager()
353:                            .destroySession(getManager().getHttpSession(id));
354:                synchronized (_sessions) {
355:                    _sessions.remove(id);
356:                }
357:            }
358:
359:            public void touchSessions(String[] ids, long time) {
360:                //      _log.info("touching sessions...: "+ids);
361:                for (int i = 0; i < ids.length; i++) {
362:                    String id = ids[i];
363:                    Object target;
364:                    // I could synch the whole block. This is slower, but will not
365:                    // hold up everything else...
366:                    synchronized (_subscribers) {
367:                        target = _subscribers.get(id);
368:                    }
369:                    try {
370:                        ((StateInterceptor) target).setLastAccessedTime(time);
371:                    } catch (Exception e) {
372:                        _log.warn("unable to touch session: " + id
373:                                + " probably already removed");
374:                    }
375:                }
376:            }
377:
378:            //----------------------------------------
379:            // subscription - Listener management...
380:
381:            protected Map _subscribers = new HashMap();
382:
383:            public void subscribe(String id, Object o) {
384:                _log.trace("subscribing: " + id);
385:                synchronized (_subscribers) {
386:                    _subscribers.put(id, o);
387:                }
388:            }
389:
390:            public void unsubscribe(String id) {
391:                _log.trace("unsubscribing: " + id);
392:                synchronized (_subscribers) {
393:                    _subscribers.remove(id);
394:                }
395:            }
396:        }
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.