onChange Class Reference

Class that triggers a report when the state changes. More...

Inheritance diagram for onChange:

Collaboration diagram for onChange:

Public Member Functions
def	__init__ (self, theConfig=CfgTrigger())
	Constructor for onChange trigger class. More...
def	test (self, theSig)
	Check if a report should be triggered for the supplied signal. More...

Public Attributes
	isInit
	prevSig
Public Attributes inherited from Trigger
	config

Detailed Description

Class that triggers a report when the state changes.

In principle, the equality binary operator should work (be defined) for the signal class. If the signal doesn't support equality, or equality is a bad idea, then try the whenDiffers trigger.

Constructor & Destructor Documentation

__init__()

def __init__	(		self,
			theConfig = CfgTrigger()
	)

Constructor for onChange trigger class.

Reimplemented from Trigger.

Member Function Documentation

test()

def test	(		self,
			theSig
	)

Check if a report should be triggered for the supplied signal.

Compare the passed signal to that from the last check (if there was one) and return true if they are not equal. For non-trivial signals, the equality binary test should be overloading to return a meaningful binary outcome.

On startup, there may be no previous signal. In that case the first invocation returns a False and stores the signal for future invocations.

Reimplemented from Trigger.

Member Data Documentation

isInit

isInit

prevSig

prevSig

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The documentation for this class was generated from the following file:

• /home/pvela/python/perceiver/perceiver/reports/triggers.py