Source Code Cross Referenced for SwingWorker.java in  » Database-Client » executequery » org » underworldlabs » swing » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database Client » executequery » org.underworldlabs.swing.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * SwingWorker.java
003:         *
004:         * Copyright (C) 2002, 2003, 2004, 2005, 2006 Takis Diakoumis
005:         *
006:         * This program is free software; you can redistribute it and/or
007:         * modify it under the terms of the GNU General Public License
008:         * as published by the Free Software Foundation; either version 2
009:         * of the License, or any later version.
010:         *
011:         * This program 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
014:         * GNU General Public License for more details.
015:         *
016:         * You should have received a copy of the GNU General Public License
017:         * along with this program; if not, write to the Free Software
018:         * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
019:         *
020:         */
021:
022:        package org.underworldlabs.swing.util;
023:
024:        import javax.swing.SwingUtilities;
025:
026:        /* ----------------------------------------------------------
027:         * CVS NOTE: Changes to the CVS repository prior to the 
028:         *           release of version 3.0.0beta1 has meant a 
029:         *           resetting of CVS revision numbers.
030:         * ----------------------------------------------------------
031:         */
032:
033:        /**
034:         * This is the 3rd version of SwingWorker (also known as
035:         * SwingWorker 3), an abstract class that you subclass to
036:         * perform GUI-related work in a dedicated thread.  For
037:         * instructions on using this class, see:
038:         *
039:         * http://java.sun.com/docs/books/tutorial/uiswing/misc/threads.html
040:         *
041:         * Note that the API changed slightly in the 3rd version:
042:         * You must now invoke start() on the SwingWorker after
043:         * creating it.
044:         */
045:        public abstract class SwingWorker {
046:            private Object value; // see getValue(), setValue()
047:            private Thread thread;
048:
049:            /**
050:             * Class to maintain reference to current worker thread
051:             * under separate synchronization control.
052:             */
053:            private static class ThreadVar {
054:                private Thread thread;
055:
056:                ThreadVar(Thread t) {
057:                    thread = t;
058:                }
059:
060:                synchronized Thread get() {
061:                    return thread;
062:                }
063:
064:                synchronized void clear() {
065:                    thread = null;
066:                }
067:            }
068:
069:            private ThreadVar threadVar;
070:
071:            /**
072:             * Get the value produced by the worker thread, or null if it
073:             * hasn't been constructed yet.
074:             */
075:            protected synchronized Object getValue() {
076:                return value;
077:            }
078:
079:            /**
080:             * Set the value produced by worker thread
081:             */
082:            private synchronized void setValue(Object x) {
083:                value = x;
084:            }
085:
086:            /**
087:             * Compute the value to be returned by the <code>get</code> method.
088:             */
089:            public abstract Object construct();
090:
091:            /**
092:             * Called on the event dispatching thread (not on the worker thread)
093:             * after the <code>construct</code> method has returned.
094:             */
095:            public void finished() {
096:            }
097:
098:            /**
099:             * A new method that interrupts the worker thread.  Call this method
100:             * to force the worker to stop what it's doing.
101:             */
102:            public void interrupt() {
103:                Thread t = threadVar.get();
104:                if (t != null) {
105:                    t.interrupt();
106:                }
107:                threadVar.clear();
108:            }
109:
110:            /**
111:             * Return the value created by the <code>construct</code> method.
112:             * Returns null if either the constructing thread or the current
113:             * thread was interrupted before a value was produced.
114:             *
115:             * @return the value created by the <code>construct</code> method
116:             */
117:            public Object get() {
118:                while (true) {
119:                    Thread t = threadVar.get();
120:                    if (t == null) {
121:                        return getValue();
122:                    }
123:                    try {
124:                        t.join();
125:                    } catch (InterruptedException e) {
126:                        Thread.currentThread().interrupt(); // propagate
127:                        return null;
128:                    }
129:                }
130:            }
131:
132:            /**
133:             * Start a thread that will call the <code>construct</code> method
134:             * and then exit.
135:             */
136:            public SwingWorker() {
137:                final Runnable doFinished = new Runnable() {
138:                    public void run() {
139:                        finished();
140:                    }
141:                };
142:
143:                Runnable doConstruct = new Runnable() {
144:                    public void run() {
145:                        try {
146:                            setValue(construct());
147:                        } finally {
148:                            threadVar.clear();
149:                        }
150:
151:                        SwingUtilities.invokeLater(doFinished);
152:                    }
153:                };
154:
155:                Thread t = new Thread(doConstruct);
156:                threadVar = new ThreadVar(t);
157:            }
158:
159:            /**
160:             * Start the worker thread.
161:             */
162:            public void start() {
163:                Thread t = threadVar.get();
164:                if (t != null) {
165:                    t.start();
166:                }
167:            }
168:        }
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