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 the com.oreilly.servlet library, any library
22 * licensed under the Apache Software License, The Sun (tm) Java Advanced
23 * Imaging library (JAI), The Sun JIMI library (or with modified versions of
24 * the above that use the same license as the above), and distribute linked
25 * combinations including the two. You must obey the GNU General Public
26 * License in all respects for all of the code used other than the above
27 * mentioned libraries. If you modify this file, you may extend this exception
28 * to your version of the file, but you are not obligated to do so. If you do
29 * not wish to do so, delete this exception statement from your version.
32 package mircoders.global;
36 // important: objects passed as data must not be altered once put into a job
38 public class JobQueue {
40 private Map dataToJob;
42 public static final int STATUS_PENDING = 0;
43 public static final int STATUS_PROCESSING = 1;
44 public static final int STATUS_PROCESSED = 2;
48 dataToJob = new HashMap();
51 public void appendJob(Object aData) {
53 Job job = new Job(aData);
55 dataToJob.put(aData, job);
59 public Object acquirePendingJob() {
61 Iterator i = jobs.iterator();
64 Job job = (Job) i.next();
66 if (job.setProcessing()) {
75 public void flagOffJob(Object aData) {
77 Job job = (Job) dataToJob.get(aData);
85 public void cleanupJobs() {
87 Iterator i = jobs.iterator();
90 Job job = (Job) i.next();
92 if (job.hasBeenProcessed()) {
99 public List makeJobListSnapshot() {
100 synchronized (jobs) {
101 return (List) jobs.clone();
105 public class Job implements Cloneable {
109 public Job(Object aData, int aStatus) {
114 public Job(Object aData) {
115 this(aData, STATUS_PENDING);
118 public Object getData() {
122 public int getStatus() {
128 protected boolean setProcessing() {
129 return setStatus(STATUS_PENDING, STATUS_PROCESSING);
132 protected void setProcessed() {
133 setStatus(STATUS_PROCESSING, STATUS_PROCESSED);
136 public boolean hasBeenProcessed() {
137 return getStatus() == STATUS_PROCESSED;
140 public boolean isProcessing() {
141 return getStatus() == STATUS_PROCESSING;
144 public boolean isPending() {
145 return getStatus() == STATUS_PENDING;
148 private boolean setStatus(int anOldStatus, int aNewStatus) {
150 if (status == anOldStatus) {
160 protected Object clone() {
162 return new Job(data, status);