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42 lines
1.1 KiB
Python
42 lines
1.1 KiB
Python
"""
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CommandChannel protocol for GraphEngine command communication.
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This protocol defines the interface for sending and receiving commands
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to/from a GraphEngine instance, supporting both local and distributed scenarios.
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"""
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from typing import Protocol
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from ..entities.commands import GraphEngineCommand
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class CommandChannel(Protocol):
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"""
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Protocol for bidirectional command communication with GraphEngine.
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Since each GraphEngine instance processes only one workflow execution,
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this channel is dedicated to that single execution.
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"""
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def fetch_commands(self) -> list[GraphEngineCommand]:
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"""
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Fetch pending commands for this GraphEngine instance.
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Called by GraphEngine to poll for commands that need to be processed.
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Returns:
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List of pending commands (may be empty)
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"""
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...
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def send_command(self, command: GraphEngineCommand) -> None:
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"""
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Send a command to be processed by this GraphEngine instance.
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Called by external systems to send control commands to the running workflow.
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Args:
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command: The command to send
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"""
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...
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