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Fault Tolerance Callback Actions

Fault tolerance callback functions receive an action argument—one of three tokens, which instruct the callback function to behave in one of three ways:

•

ACTIVATE

This action token instructs the callback function to switch the member process into active mode.

•	DEACTIVATE

This action token instructs the callback function to switch the member process into inactive mode.

•	PREPARE_TO_ACTIVATE

This action token is a hint that Rendezvous fault tolerance software might soon issue an instruction to activate. It instructs the callback function to prepare for possible activation by doing any time-consuming steps that can be done before the actual order to activate.

Remember that the prepare-to-activate hint is exactly that—a hint. Several circumstances might later render activation unnecessary.

 

The names of the tokens vary slightly among the different programming languages.

 

Table 35 Fault Tolerance Actions 

C	tibrvftAction
C++	tibrvftAction
Java	Tokens are defined as constant fields of TibrvFtMember.
.NET	ActionToken enumerates the tokens.

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