75 lines
2 KiB
Python
75 lines
2 KiB
Python
from collections.abc import Callable
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from typing import TypeVar, Union
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from core.emulator.data import (
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ConfigData,
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EventData,
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ExceptionData,
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FileData,
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LinkData,
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NodeData,
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)
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from core.errors import CoreError
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T = TypeVar(
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"T",
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bound=Union[
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EventData,
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ExceptionData,
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NodeData,
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LinkData,
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FileData,
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ConfigData,
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],
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)
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class BroadcastManager:
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def __init__(self) -> None:
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"""
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Creates a BroadcastManager instance.
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"""
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self.handlers: dict[type[T], set[Callable[[T], None]]] = {}
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def send(self, data: T) -> None:
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"""
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Retrieve handlers for data, and run all current handlers.
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:param data: data to provide to handlers
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:return: nothing
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"""
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handlers = self.handlers.get(type(data), set())
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for handler in handlers:
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handler(data)
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def add_handler(self, data_type: type[T], handler: Callable[[T], None]) -> None:
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"""
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Add a handler for a given data type.
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:param data_type: type of data to add handler for
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:param handler: handler to add
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:return: nothing
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"""
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handlers = self.handlers.setdefault(data_type, set())
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if handler in handlers:
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raise CoreError(
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f"cannot add data({data_type}) handler({repr(handler)}), "
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f"already exists"
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)
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handlers.add(handler)
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def remove_handler(self, data_type: type[T], handler: Callable[[T], None]) -> None:
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"""
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Remove a handler for a given data type.
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:param data_type: type of data to remove handler for
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:param handler: handler to remove
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:return: nothing
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"""
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handlers = self.handlers.get(data_type, set())
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if handler not in handlers:
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raise CoreError(
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f"cannot remove data({data_type}) handler({repr(handler)}), "
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f"does not exist"
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)
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handlers.remove(handler)
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