Hello, TopBraid Suite team!
After one half year of working on my project I have discovered that
the ChangeEngine mechanism not working such, how I wanted to use it.
The point is following: i have multiple changes in a batch, and i want
they all to be handled atomically.
Here is the execute()-method of the MyCommand (extends
org.eclipse.gef.commands.Command):
if (!TB.getSession().getChangeEngine().isBusy()){
IChange change = new AbstractChange(changeName) {
@Override
public void execute(ISession arg0, IProgressMonitor arg1)
throws
InterruptedException {
//changes the graph: 4 operations
child.setBounds(constraint);
}
};
//request for execution
TB.getSession().getChangeEngine().execute(change);
}
else {
//changes the graph: 4 operations
child.setBounds(constraint);
}
So, when there are multiple such commands in a batch, the first of
them creates an IChange (Change A) and an execution will be requested.
When the second command runs, the direct change (Change B) should be
performed.
But!
>From 4 operations of Change B the FIRST operation is fired by jena's
GraphMemBulkUpdateHandler to the GraphTracker, which to
TBCChangeEngine, which to PropertiesTreeView, and PropertiesTreeView
makes the main threed asleep and runs the parallel thread with
TBCChangeEngine, where Change A is executed. After that
TBCChangeEngine fires changes to my IChangeEngineListener, and I see
there Change X = Change A + the first operation of Change B (5
operations). Then after this thread has finished, the main thread goes
on and makes the leftover 3 ograph operations DIRECTLY on the graph.
Therefore the undo/redo is not working and the graphics is 'blinking'
because of multiple updates insteed of only one.
I hope you can follow my explanations..Please tell me, how can I fix
this behaviour?
Best regards
Andriy
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