BaseRestartWorkChain: require process handlers to be instance methods
#3782
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sphuber
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yakutovicha
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Thanks, @sphuber.
Just a few comments, questions. I did not try to run it myself yet.
The original implementation of the `register_process_handler` allowed an unbound method to be bound to a subclass of `BaseRestartWorkChain` outside of its scope. Since this also makes it possible to attach these process handlers from outside of the module of the work chain, this will run the risk of the loss of provenance. Here we rename the decorator to `process_handler` and it can only be applied to instance methods. This forces the handlers to be defined in the same module as the work chain to which they apply.
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Fixes #3780
The original implementation of the
register_process_handlerallowed anunbound method to be bound to a subclass of
BaseRestartWorkChainoutside of its scope. Since this also makes it possible to attach these
process handlers from outside of the module of the work chain, this will
run the risk of the loss of provenance. Here we rename the decorator to
process_handlerand it can only be applied to instance methods. Thisforces the handlers to be defined in the same module as the work chain
to which they apply.