001: /**
002: * JOnAS: Java(TM) Open Application Server
003: * Copyright (C) 1999-2004 Bull S.A.
004: * Contact: jonas-team@objectweb.org
005: *
006: * This library is free software; you can redistribute it and/or
007: * modify it under the terms of the GNU Lesser General Public
008: * License as published by the Free Software Foundation; either
009: * version 2.1 of the License, or any later version.
010: *
011: * This library is distributed in the hope that it will be useful,
012: * but WITHOUT ANY WARRANTY; without even the implied warranty of
013: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014: * Lesser General Public License for more details.
015: *
016: * You should have received a copy of the GNU Lesser General Public
017: * License along with this library; if not, write to the Free Software
018: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
019: * USA
020: *
021: * Initial developer(s): Florent BENOIT & Ludovic BERT
022: * --------------------------------------------------------------------------
023: * $Id: WorkCleaner.java 6673 2005-04-28 16:53:00Z benoitf $
024: * --------------------------------------------------------------------------
025: */package org.objectweb.jonas_lib.deployment.work;
026:
027: import java.util.Enumeration;
028: import java.util.Vector;
029:
030: import org.objectweb.util.monolog.api.Logger;
031: import org.objectweb.util.monolog.api.BasicLevel;
032:
033: import org.objectweb.jonas.common.Log;
034:
035: /**
036: * JOnAS work deployment files and directories cleaner class. This class
037: * provides a way for removing entries wich are unconsistent.
038: * @author Florent Benoit
039: * @author Ludovic Bert
040: * @author Benoit PELLETIER
041: */
042: public class WorkCleaner extends Thread {
043:
044: /**
045: * The logger used in JOnAS
046: */
047: private static Logger logger = Log
048: .getLogger(Log.JONAS_DEPLOY_WORK_PREFIX);
049:
050: /**
051: * Sleep time for the thread of the cleaner
052: */
053: private static final int SLEEP_TIME = 300000;
054:
055: /**
056: * the instance of this VM. There is only one instance of the cleaner
057: * running in the same VM.
058: */
059: private static WorkCleaner unique = null;
060:
061: /**
062: * The list of tasks to execute at each period
063: */
064: private Vector taskList = null;
065:
066: /**
067: * Default constructor : Construct a new cleaner.
068: */
069: private WorkCleaner() {
070: super ("WorkCleaner");
071: // set a low priority for this thread in order to reduce
072: // the impacts on 'functionnal' threads.
073: this .setPriority(Thread.MIN_PRIORITY);
074: taskList = new Vector();
075: }
076:
077: /**
078: * @return the logger
079: */
080: protected static Logger getLogger() {
081: return logger;
082: }
083:
084: /**
085: * Get an instance of the Work Cleaner.
086: * @return the instance of the Work Cleaner.
087: */
088: public static synchronized WorkCleaner getInstance() {
089: if (unique == null) {
090: unique = new WorkCleaner();
091: }
092: if (getLogger().isLoggable(BasicLevel.DEBUG)) {
093: getLogger().log(BasicLevel.DEBUG,
094: "getInstance : ->" + unique);
095: }
096: return unique;
097: }
098:
099: /**
100: * Register a new clean task
101: * @param absCleanTask the task to add
102: * @throws CleanerException if the task cannot be registred
103: */
104: public synchronized void registerTask(AbsCleanTask absCleanTask)
105: throws CleanerException {
106: if (getLogger().isLoggable(BasicLevel.DEBUG)) {
107: getLogger().log(BasicLevel.DEBUG, "registerTask : called");
108: }
109: // checks
110: if (taskList == null) {
111: throw new CleanerException(
112: "Can not add an entry, the vector is null");
113: }
114: if (absCleanTask == null) {
115: throw new CleanerException("Can not add a null entry");
116: }
117: // Add if don't already exist
118: if (!taskList.contains(absCleanTask)) {
119: taskList.add(absCleanTask);
120: }
121: }
122:
123: /**
124: * Execute the registered tasks
125: */
126: public synchronized void executeTasks() {
127: try {
128: AbsCleanTask absCleanTask = null;
129:
130: if (getLogger().isLoggable(BasicLevel.DEBUG)) {
131: getLogger().log(BasicLevel.DEBUG,
132: "executeTasks : wake up");
133: }
134: for (Enumeration e = taskList.elements(); e
135: .hasMoreElements();) {
136:
137: absCleanTask = (AbsCleanTask) e.nextElement();
138: absCleanTask.execute();
139: }
140:
141: } catch (CleanerException e) {
142: e.printStackTrace();
143: }
144: }
145:
146: /**
147: * Start the thread of this class It will clean all the work entries
148: */
149: public void run() {
150:
151: for (;;) {
152: executeTasks();
153: try {
154: Thread.sleep(SLEEP_TIME);
155: } catch (InterruptedException e) {
156: throw new RuntimeException("Thread fail to sleep");
157: }
158: }
159: }
160:
161: }
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