com.declarativa.interprolog

Interface PrologEngineListener

All Known Implementing Classes:

EngineController

public interface PrologEngineListener

If you're interested in an engine's overall activity, implement this interface on your class and make your object a listener to a PrologEngine.

Method Summary

Modifier and Type	Method and Description
void	availabilityChanged(AbstractPrologEngine source) The value of isAvailable() has changed.
void	javaMessaged(AbstractPrologEngine source) The Java side is starting processing a javaMessage Prolog goal (callback) request
String	willWork(AbstractPrologEngine source) Prolog is asking the Java layer permission to continue; return non null (a reason/message) if you want to abort the Prolog computation.

Method Detail

willWork

String willWork(AbstractPrologEngine source)

Prolog is asking the Java layer permission to continue; return non null (a reason/message) if you want to abort the Prolog computation. During execution of this method you can call Prolog goals, say to introspect system state etc. This requires

Parameters:

source - the Prolog engine that is asking permission

Returns:

null if Prolog can proceed, an error message if it should abort

See Also:

AbstractPrologEngine.setTimedCallIntervall(int)

javaMessaged

void javaMessaged(AbstractPrologEngine source)

The Java side is starting processing a javaMessage Prolog goal (callback) request

Parameters:

source - the engine being messaged by Prolog

availabilityChanged

void availabilityChanged(AbstractPrologEngine source)

The value of isAvailable() has changed. Use source.isAvailable() to get the value. This is currently fired only for SubprocessEngines

Parameters:

source - the engine