Method Concurrent.Future()->on_failure()

Method on_failure

this_program on_failure(function(mixed, __unknown__ ... :void) cb, mixed ... extra)

Description

Register a callback that is to be called on failure.

Parameter cb

Function to be called. The first argument will be the failure result of the Future.

Parameter extra

Any extra context needed for cb. They will be provided as arguments two and onwards when cb is called.

Note

cb will always be called from the main backend.

See also

on_success(), query_failure_callbacks()