"Ripple" handling in state changed event

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Hello all!

My C# application listen state changed event (state is true or false) from embedded system. According state certain code will be executed.

My problem is that when state changes there will be "ripple" in events. For example if state changes from false to true I will get x pcs true/false events in row until state settles finally to true (same happens true -> false). That means my code will execute loads of code for false state and true state, that is totally unacceptable.

in event handling I have simply

C#

if(true)
//execute true methods
else
//execute false methods

I hope you got some ideas and guidance for this problem.

Hope you got idea :)

Cheers!

Posted 1-Nov-11 22:34pm

paleGegg0

Updated 1-Nov-11 22:48pm

v2

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3 solutions

Solution 2

maybe you can disable event handling in the handler when an event comes in,then handle the event, and finally re-enable the handling?

Posted 2-Nov-11 3:43am

joost.versteegen

Solution 3

If all the state change events are the same, i.e. you receive
StateChange: true
StateChange: true
StateChange: true
StateChange: true
StateChange: true
StateChange: true

... then in your handler simply check if the state is the same as the last reported one, and if so, do nothing.

If not, you need to delay update until the system has stabilised, using a timer which you reset each time you get another update. That's a bit ugly but if there's no way to know which is the last real update there's no other way to avoid multiple refreshes.

Posted 2-Nov-11 4:10am

BobJanova

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Mehdi Gholam · Accepted Answer · 2011-11-01T22:48:00

Solution 1

Try keeping a list of say 10 previous states and averaging them.

You can also keep a time value for the previous 10 and and take the last 1 second stable value.

Posted 1-Nov-11 22:48pm

Mehdi Gholam

Comments

paleGegg0 2-Nov-11 12:07pm

Thanks for your guidance, helped a lot! :)