47 lines
1.8 KiB
Python
47 lines
1.8 KiB
Python
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"""
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This file contains the base MEOW handler defintion. This should be inherited
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from for all handler instances.
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Author(s): David Marchant
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"""
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from typing import Any, Tuple, Dict
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from core.correctness.vars import get_drt_imp_msg, VALID_CHANNELS
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from core.correctness.validation import check_implementation
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class BaseHandler:
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# A channel for sending messages to the runner. Note that this will be
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# overridden by a MeowRunner, if a handler instance is passed to it, and so
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# does not need to be initialised within the handler itself.
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to_runner: VALID_CHANNELS
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# Directory where queued jobs are initially written to. Note that this
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# will be overridden by a MeowRunner, if a handler instance is passed to
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# it, and so does not need to be initialised within the handler itself.
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job_queue_dir:str
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def __init__(self)->None:
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"""BaseHandler Constructor. This will check that any class inheriting
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from it implements its validation functions."""
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check_implementation(type(self).handle, BaseHandler)
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check_implementation(type(self).valid_handle_criteria, BaseHandler)
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def __new__(cls, *args, **kwargs):
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"""A check that this base class is not instantiated itself, only
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inherited from"""
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if cls is BaseHandler:
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msg = get_drt_imp_msg(BaseHandler)
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raise TypeError(msg)
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return object.__new__(cls)
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def valid_handle_criteria(self, event:Dict[str,Any])->Tuple[bool,str]:
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"""Function to determine given an event defintion, if this handler can
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process it or not. Must be implemented by any child process."""
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pass
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def handle(self, event:Dict[str,Any])->None:
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"""Function to handle a given event. Must be implemented by any child
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process."""
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pass
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