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Dispatch task completions on the swing event thread.

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git-svn-id: https://samskivert.googlecode.com/svn/trunk@99 6335cc39-0255-0410-8fd6-9bcaacd3b74c
This commit is contained in:
mdb
2001-03-15 19:34:06 +00:00
parent 53d7315932
commit 23cce67346
1 changed files with 59 additions and 29 deletions
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projects/samskivert/src/java/com/samskivert/swing/util/TaskMaster.java
+59 -29
View File
@@ -1,10 +1,12 @@
//
// $Id: TaskMaster.java,v 1.2 2000/12/07 06:14:36 mdb Exp $
// $Id: TaskMaster.java,v 1.3 2001/03/15 19:34:06 mdb Exp $
package com.samskivert.swing.util;
import java.util.Hashtable;
import com.samskivert.util.Log;
import javax.swing.SwingUtilities;
import com.samskivert.Log;
/**
* The task master provides the ability for swing applications to invoke
@@ -21,9 +23,6 @@ import com.samskivert.util.Log;
*/
public class TaskMaster
{
/** The log object to be used by the task master and services. */
public static Log log = new Log("com.samskivert.swing.util.task");
/**
* Instructs the task master to run the supplied task. The task is
* given the supplied name and can be referenced by that name in
@@ -56,44 +55,75 @@ public class TaskMaster
_name = name;
_task = task;
_observer = observer;
_mode = INVOKE;
}
public void run ()
/**
* Invokes the task and then reports completion or failure later
* on the swing event dispatcher thread. We need to ensure that
* _mode and _result are visible to the various threads that
* invoke this runnable so run() is synchronized. Oh how I love
* Chapter 17.
*/
public synchronized void run ()
{
try {
Object result = _task.invoke();
if (_observer != null) {
try {
_observer.taskCompleted(_name, result);
} catch (Throwable t) {
log.warning("Observer choked in " +
"taskCompleted(): " + t);
log.logStackTrace(Log.WARNING, t);
}
}
switch (_mode) {
default:
case INVOKE:
// invoke the task and catch any errors
try {
_result = _task.invoke();
_mode = COMPLETED;
} catch (Throwable t) {
_result = t;
_mode = FAILED;
} finally {
TaskMaster.removeTask(_name);
}
} catch (Throwable t) {
if (_observer != null) {
try {
_observer.taskFailed(_name, t);
} catch (Throwable ot) {
log.warning("Observer choked in taskFailed(): " + ot);
log.logStackTrace(Log.WARNING, t);
}
}
}
// queue ourselves up to run again on the swing event
// dispatch thread if we have an observer
if (_observer != null) {
SwingUtilities.invokeLater(this);
}
break;
TaskMaster.removeTask(_name);
case COMPLETED:
try {
_observer.taskCompleted(_name, _result);
} catch (Throwable t) {
Log.warning("Observer choked in " +
"taskCompleted(): " + t);
Log.logStackTrace(t);
}
break;
case FAILED:
try {
_observer.taskFailed(_name, (Throwable)_result);
} catch (Throwable ot) {
Log.warning("Observer choked in taskFailed(): " + ot);
Log.logStackTrace(ot);
}
break;
}
}
public void abort ()
{
log.warning("abort() not currently supported.");
Log.warning("abort() not currently supported.");
}
protected String _name;
protected Task _task;
protected TaskObserver _observer;
protected int _mode;
protected Object _result;
protected static final int INVOKE = 0;
protected static final int COMPLETED = 1;
protected static final int FAILED = 2;
}
protected static Hashtable _tasks = new Hashtable();