Rename hypervisor to compute

Fix #487

gns3server/compute/notification_manager.py

@@ -0,0 +1,69 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2016 GNS3 Technologies Inc.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from contextlib import contextmanager
+
+
+from ..notification_queue import NotificationQueue
+
+
+class NotificationManager:
+    """
+    Manage the notification queue where the controller
+    will connect to get notifications from computes
+    """
+
+    def __init__(self):
+        self._listeners = set()
+
+    @contextmanager
+    def queue(self):
+        """
+        Get a queue of notifications
+
+        Use it with Python with
+        """
+        queue = NotificationQueue()
+        self._listeners.add(queue)
+        yield queue
+        self._listeners.remove(queue)
+
+    def emit(self, action, event, **kwargs):
+        """
+        Send an event to all the client listening for notifications
+
+        :param action: Action name
+        :param event: Event to send
+        :param kwargs: Add this meta to the notif (project_id for example)
+        """
+        for listener in self._listeners:
+            listener.put_nowait((action, event, kwargs))
+
+    @staticmethod
+    def reset():
+        NotificationManager._instance = None
+
+    @staticmethod
+    def instance():
+        """
+        Singleton to return only on instance of NotificationManager.
+        :returns: instance of NotificationManager
+        """
+
+        if not hasattr(NotificationManager, '_instance') or NotificationManager._instance is None:
+            NotificationManager._instance = NotificationManager()
+        return NotificationManager._instance