Originally posted by: arthuro

Hello,
is there a command that can stop CPLEX during a computation?
I have a GUI which uses a SwingWorker to start my CPLEX model (to do it in the background, so that the GUI stays responsive). When I cancel the worker, CPLEX keeps working in the background. If I would use something like cplexModel.end(), I'd get a fatal error.

Any ideas?
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#DecisionOptimization

Originally posted by: SystemAdmin

Stopping the optimization process gracefully (such that the solutions obtained till that point are preserved) will require you to implement callbacks or use the IloCplex.Aborter class. I would recommend you to go through the MIPex4.java example which comes with the distribution that shows one such implementation. The sample simply makes the 'myAborter.abort();' call, but in your case you will need to pass the Aborter object to the GUI thread which can call the abort() function based on certain inputs from the user.

I hope this helps and provides you a way forward.
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#DecisionOptimization

Originally posted by: EdKlotz

> arthuro wrote:
> Hello,
> is there a command that can stop CPLEX during a computation?
> I have a GUI which uses a SwingWorker to start my CPLEX model (to do it in the background, so that the GUI stays responsive). When I cancel the worker, CPLEX keeps working in the background. If I would use something like cplexModel.end(), I'd get a fatal error.
>
> Any ideas?

The fundamental mechanism CPLEX provides to stop the optimization involves the CPXterminate
function in the C API and IloCplex.Aborter class in Java (and similar for C++). You can use
this either from within a CPLEX callback, or, if using multiple threads, in threads that are
separate from the CPLEX solving process.
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: arthuro

Thank you very much, Abort() is working like a charm.
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