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GenServers Callbacks

The callback functions are part of an implementation module and are called by the :genserver actor on startup or on cast and call requests:

GenServers.init — Function
init(default...)

This callback function is called on startup by a :genserver actor. It gets the default... argument provided with the genserver start function.

Its return value is saved in the :genserver actor's state variable and then served to subsequent call and cast callbacks.

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GenServers.oncast — Function
oncast(default..., msg...)

This callback function is executed on the default... state variable with msg... message arguments from a cast request. This can be used to modify the default... state variable(s).

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GenServers.oncall — Function
oncall(default..., msg...)

This callback function is executed on the default... state variable with msg... message arguments from a call request. This can be used to modify the default... state variable(s). Its return value is sent back to the caller.

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