com.ergotech.secs.gem

Interface StateChangeNotification

All Known Implementing Classes:

GemSpoolHandler

public interface StateChangeNotification

This interface should be implemented by anyone wishing to be notified of or control state changes. Objects that implement this interface can be added to either the CommunicationsHandler or the OnlineHandler.

See Also:

CommunicationsHandler.addStateChangeNotifier(com.ergotech.secs.gem.StateChangeNotification), OnlineHandler.addStateChangeNotifier(com.ergotech.secs.gem.StateChangeNotification)

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	cvsRev

Method Summary

Modifier and Type	Method and Description
void	changeStateProposed(int oldState, int newState) This method is called before a state change.

Field Detail

cvsRev

static final java.lang.String cvsRev

See Also:

Constant Field Values

Method Detail

changeStateProposed

void changeStateProposed(int oldState,
                         int newState)
                  throws DeclinedStateChangeException

This method is called before a state change. If the method returns then the state change will proceed. If the method throws then the state change will be aborted.

Throws:

SecsException - thrown to prevent the proposed change

DeclinedStateChangeException