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70 lines
2.1 KiB
70 lines
2.1 KiB
#!/usr/bin/env python
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#
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# Copyright (C) 2016 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from contextlib import contextmanager
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from ..notification_queue import NotificationQueue
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class NotificationManager:
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"""
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Manage the notification queue where the controller
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will connect to get notifications from computes
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"""
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def __init__(self):
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self._listeners = set()
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@contextmanager
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def queue(self):
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"""
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Get a queue of notifications
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Use it with Python with
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"""
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queue = NotificationQueue()
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self._listeners.add(queue)
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yield queue
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self._listeners.remove(queue)
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def emit(self, action, event, **kwargs):
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"""
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Send an event to all the client listening for notifications
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:param action: Action name
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:param event: Event to send
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:param kwargs: Add this meta to the notification (project_id for example)
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"""
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for listener in self._listeners:
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listener.put_nowait((action, event, kwargs))
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@staticmethod
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def reset():
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NotificationManager._instance = None
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@staticmethod
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def instance():
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"""
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Singleton to return only on instance of NotificationManager.
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:returns: instance of NotificationManager
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"""
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if not hasattr(NotificationManager, '_instance') or NotificationManager._instance is None:
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NotificationManager._instance = NotificationManager()
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return NotificationManager._instance
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