2 * Copyright (C) 2001, 2002 The Mir-coders group
4 * This file is part of Mir.
6 * Mir is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * Mir is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with Mir; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * In addition, as a special exception, The Mir-coders gives permission to link
21 * the code of this program with any library licensed under the Apache Software License,
22 * The Sun (tm) Java Advanced Imaging library (JAI), The Sun JIMI library
23 * (or with modified versions of the above that use the same license as the above),
24 * and distribute linked combinations including the two. You must obey the
25 * GNU General Public License in all respects for all of the code used other than
26 * the above mentioned libraries. If you modify this file, you may extend this
27 * exception to your version of the file, but you are not obligated to do so.
28 * If you do not wish to do so, delete this exception statement from your version.
31 package mircoders.global;
34 import java.util.Calendar;
35 import java.util.Date;
36 import java.util.GregorianCalendar;
37 import java.util.HashMap;
38 import java.util.Iterator;
39 import java.util.List;
41 import java.util.Vector;
43 import mir.log.LoggerWrapper;
45 // important: objects passed as data must not be altered once put into a job
47 public class JobQueue {
48 private Vector jobHandlers;
49 private Map identifierToJobHandler;
51 private int jobCleanupTreshold;
52 private JobQueueRunner queueRunner;
53 private Thread thread;
54 private LoggerWrapper logger;
55 private long lastCleanup;
57 public static final int STATUS_CREATED = -1;
58 public static final int STATUS_PENDING = 0;
59 public static final int STATUS_PROCESSING = 1;
60 public static final int STATUS_PROCESSED = 2;
61 public static final int STATUS_CANCELLED = 3;
62 public static final int STATUS_ABORTED = 4;
64 public static final int PRIORITY_NORMAL = 100;
65 public static final int PRIORITY_LOW = 10;
66 public static final int PRIORITY_HIGH = 1000;
68 public static final int FINISHEDJOBS_LOGSIZE = 10;
70 public JobQueue(LoggerWrapper aLogger) {
72 jobHandlers = new Vector();
73 identifierToJobHandler = new HashMap();
76 jobCleanupTreshold = 900; // seconds
77 queueRunner = new JobQueueRunner(logger);
78 thread = new Thread(queueRunner);
82 public String appendJob(Job aJob, String aDescription) {
84 if (System.currentTimeMillis() - lastCleanup > 60000)
88 logger.error("error while cleaning up joblist: " + t.toString());
91 synchronized (jobHandlers) {
92 JobHandler jobHandler = new JobHandler(aJob, Integer.toString(nrJobs), aDescription);
94 jobHandlers.add(jobHandler);
95 identifierToJobHandler.put(jobHandler.getIdentifier(), jobHandler);
96 jobHandler.setPending();
98 return jobHandler.getIdentifier();
102 public List getJobsInfo() {
103 List result = new Vector();
105 synchronized (jobHandlers) {
106 Iterator i = jobHandlers.iterator();
108 while (i.hasNext()) {
109 result.add(0, ((JobHandler) i.next()).getJobInfo());
116 private void cleanupJobList() {
117 List toRemove = new Vector();
118 synchronized (jobHandlers) {
119 Iterator i = jobHandlers.iterator();
121 Calendar tresholdCalendar = new GregorianCalendar();
122 tresholdCalendar.add(Calendar.SECOND, -jobCleanupTreshold);
123 Date treshold = tresholdCalendar.getTime();
125 while (i.hasNext()) {
126 JobHandler jobHandler = (JobHandler) i.next();
128 synchronized (jobHandler) {
129 if (jobHandler.isFinished() && jobHandler.getLastChange().before(treshold)) {
130 toRemove.add(jobHandler);
135 jobHandlers.removeAll(toRemove);
138 lastCleanup = System.currentTimeMillis();
141 private JobHandler acquirePendingJob() {
142 synchronized (jobHandlers) {
143 int priorityFound= 0;
147 Iterator i = jobHandlers.iterator();
148 while (i.hasNext()) {
149 JobHandler job = (JobHandler) i.next();
151 if (job.isPending() && (jobFound==null || priorityFound<job.getPriority())) {
153 priorityFound = job.getPriority();
161 public void cancelJobs(List aJobs) {
162 synchronized (jobHandlers) {
163 Iterator i = aJobs.iterator();
165 while (i.hasNext()) {
166 ((JobHandler) identifierToJobHandler.get(i.next())).cancelOrAbortJob();
171 public interface Job {
177 * @return <code>true</code> if terminated normally, <code>false</code> if aborted
182 public static class JobInfo {
183 private String identifier;
184 private Date lastChange;
186 private long runningTime;
187 private int priority;
188 private String description;
190 private JobInfo(String aDescription, int aStatus, Date aLastChange, String anIdentifier, long aRunningTime, int aPriority) {
191 description = aDescription;
192 lastChange = aLastChange;
194 identifier = anIdentifier;
195 priority = aPriority;
196 runningTime = aRunningTime;
199 public String getDescription() {
203 public int getStatus() {
207 public int getPriority() {
211 public Date getLastChange() {
215 public String getIdentifier() {
219 public long getRunningTime() {
224 public class JobHandler {
226 private String identifier;
227 private String description;
229 private Date lastChange;
230 private long starttime;
231 private long endtime;
233 private int priority;
234 private boolean hasRun;
236 public JobHandler(Job aJob, String anIdentifier, String aDescription, int aPriority) {
238 description = aDescription;
239 identifier = anIdentifier;
240 priority = aPriority;
241 status = STATUS_CREATED;
244 public JobHandler(Job aJob, String anIdentifier, String aDescription) {
245 this(aJob, anIdentifier, aDescription, PRIORITY_NORMAL);
248 public JobInfo getJobInfo() {
249 return new JobInfo(getDescription(), getStatus(), getLastChange(), getIdentifier(), getRunningTime(), priority);
252 private void runJob() {
253 if (setProcessing()) {
261 private void cancelOrAbortJob() {
262 synchronized (this) {
270 public int getStatus() {
276 public String getIdentifier() {
280 public String getDescription() {
284 public long getRunningTime() {
292 result = System.currentTimeMillis();
294 result = result - starttime;
301 public int getPriority() {
305 private boolean setProcessing() {
306 return setStatus(STATUS_PENDING, STATUS_PROCESSING);
309 private void setProcessed() {
310 setStatus(STATUS_PROCESSING, STATUS_PROCESSED);
313 private void setAborted() {
314 setStatus(STATUS_PROCESSING, STATUS_ABORTED);
317 private void setPending() {
318 setStatus(STATUS_CREATED, STATUS_PENDING);
321 private boolean setCancelled() {
322 return setStatus(STATUS_PENDING, STATUS_CANCELLED);
325 public boolean hasBeenProcessed() {
326 return getStatus() == STATUS_PROCESSED;
329 public boolean hasBeenAborted() {
330 return getStatus() == STATUS_ABORTED;
333 public boolean isCancelled() {
334 return getStatus() == STATUS_CANCELLED;
337 public boolean isFinished() {
338 return hasBeenProcessed() || hasBeenAborted() || isCancelled();
341 public boolean isProcessing() {
342 return getStatus() == STATUS_PROCESSING;
345 public boolean isPending() {
346 return getStatus() == STATUS_PENDING;
349 public Date getLastChange() {
350 synchronized (this) {
355 private boolean setStatus(int anOldStatus, int aNewStatus) {
357 if (status == anOldStatus) {
359 lastChange = (new GregorianCalendar()).getTime();
360 if (isProcessing()) {
361 starttime = System.currentTimeMillis();
366 endtime = System.currentTimeMillis();
377 private class JobQueueRunner implements Runnable {
378 private LoggerWrapper logger;
380 public JobQueueRunner(LoggerWrapper aLogger) {
385 logger.debug("starting JobQueueRunner");
389 JobHandler job = acquirePendingJob();
391 logger.debug(" starting job ("+job.getIdentifier()+"): " +job.getDescription());
393 logger.debug(" finished job ("+job.getIdentifier()+"): " +job.getDescription());
399 catch (InterruptedException e) {
405 logger.warn("JobQueueRunner terminated");