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 synchronized (jobHandlers) {
118 Iterator i = jobHandlers.iterator();
120 Calendar tresholdCalendar = new GregorianCalendar();
121 tresholdCalendar.add(Calendar.SECOND, -jobCleanupTreshold);
122 Date treshold = tresholdCalendar.getTime();
124 while (i.hasNext()) {
125 JobHandler jobHandler = (JobHandler) i.next();
127 synchronized (jobHandler) {
128 if (jobHandler.isFinished() && jobHandler.getLastChange().before(treshold)) {
129 jobHandlers.remove(jobHandler);
135 lastCleanup = System.currentTimeMillis();
138 private JobHandler acquirePendingJob() {
139 synchronized (jobHandlers) {
140 int priorityFound= 0;
144 Iterator i = jobHandlers.iterator();
145 while (i.hasNext()) {
146 JobHandler job = (JobHandler) i.next();
148 if (job.isPending() && (jobFound==null || priorityFound<job.getPriority())) {
150 priorityFound = job.getPriority();
158 public void cancelJobs(List aJobs) {
159 synchronized (jobHandlers) {
160 Iterator i = aJobs.iterator();
162 while (i.hasNext()) {
163 ((JobHandler) identifierToJobHandler.get(i.next())).cancelOrAbortJob();
168 public interface Job {
174 * @return <code>true</code> if terminated normally, <code>false</code> if aborted
179 public static class JobInfo {
180 private String identifier;
181 private Date lastChange;
183 private long runningTime;
184 private int priority;
185 private String description;
187 private JobInfo(String aDescription, int aStatus, Date aLastChange, String anIdentifier, long aRunningTime, int aPriority) {
188 description = aDescription;
189 lastChange = aLastChange;
191 identifier = anIdentifier;
192 priority = aPriority;
193 runningTime = aRunningTime;
196 public String getDescription() {
200 public int getStatus() {
204 public int getPriority() {
208 public Date getLastChange() {
212 public String getIdentifier() {
216 public long getRunningTime() {
221 public class JobHandler {
223 private String identifier;
224 private String description;
226 private Date lastChange;
227 private long starttime;
228 private long endtime;
230 private int priority;
231 private boolean hasRun;
233 public JobHandler(Job aJob, String anIdentifier, String aDescription, int aPriority) {
235 description = aDescription;
236 identifier = anIdentifier;
237 priority = aPriority;
238 status = STATUS_CREATED;
241 public JobHandler(Job aJob, String anIdentifier, String aDescription) {
242 this(aJob, anIdentifier, aDescription, PRIORITY_NORMAL);
245 public JobInfo getJobInfo() {
246 return new JobInfo(getDescription(), getStatus(), getLastChange(), getIdentifier(), getRunningTime(), priority);
249 private void runJob() {
250 if (setProcessing()) {
258 private void cancelOrAbortJob() {
259 synchronized (this) {
267 public int getStatus() {
273 public String getIdentifier() {
277 public String getDescription() {
281 public long getRunningTime() {
289 result = System.currentTimeMillis();
291 result = result - starttime;
298 public int getPriority() {
302 private boolean setProcessing() {
303 return setStatus(STATUS_PENDING, STATUS_PROCESSING);
306 private void setProcessed() {
307 setStatus(STATUS_PROCESSING, STATUS_PROCESSED);
310 private void setAborted() {
311 setStatus(STATUS_PROCESSING, STATUS_ABORTED);
314 private void setPending() {
315 setStatus(STATUS_CREATED, STATUS_PENDING);
318 private boolean setCancelled() {
319 return setStatus(STATUS_PENDING, STATUS_CANCELLED);
322 public boolean hasBeenProcessed() {
323 return getStatus() == STATUS_PROCESSED;
326 public boolean hasBeenAborted() {
327 return getStatus() == STATUS_ABORTED;
330 public boolean isCancelled() {
331 return getStatus() == STATUS_CANCELLED;
334 public boolean isFinished() {
335 return hasBeenProcessed() || hasBeenAborted() || isCancelled();
338 public boolean isProcessing() {
339 return getStatus() == STATUS_PROCESSING;
342 public boolean isPending() {
343 return getStatus() == STATUS_PENDING;
346 public Date getLastChange() {
347 synchronized (this) {
352 private boolean setStatus(int anOldStatus, int aNewStatus) {
354 if (status == anOldStatus) {
356 lastChange = (new GregorianCalendar()).getTime();
357 if (isProcessing()) {
358 starttime = System.currentTimeMillis();
363 endtime = System.currentTimeMillis();
374 private class JobQueueRunner implements Runnable {
375 private LoggerWrapper logger;
377 public JobQueueRunner(LoggerWrapper aLogger) {
382 logger.debug("starting JobQueueRunner");
386 JobHandler job = acquirePendingJob();
388 logger.debug(" starting job ("+job.getIdentifier()+"): " +job.getDescription());
390 logger.debug(" finished job ("+job.getIdentifier()+"): " +job.getDescription());
396 catch (InterruptedException e) {
402 logger.warn("JobQueueRunner terminated");