dispatcher: pass name to EventQueue and track all instances

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

ryu/controller/controller.py

@@ -80,7 +80,8 @@ class Datapath(object):
         self.recv_q = Queue()
         self.send_q = Queue()
 
-        self.ev_q = dispatcher.EventQueue(handler.handshake_dispatcher)
+        self.ev_q = dispatcher.EventQueue(handler.QUEUE_NAME_OFP_MSG,
+                                          handler.handshake_dispatcher)
 
         self.version_sent = None
         self.version_recv = None

ryu/controller/dispatcher.py

@@ -12,16 +12,27 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
 import copy
 import logging
+import weakref
+
 from gevent.queue import Queue
 
+
 LOG = logging.getLogger('ryu.controller.dispatcher')
 
 
 class EventQueue(object):
-    def __init__(self, dispatcher):
+    # WeakSet: This set is populated by __init__().
+    #          So need to use weak reference in order to make instances
+    #          freeable by avoiding refrence count.
+    #          Otherwise, instances can't be freed.
+    event_queues = weakref.WeakSet()
+
+    def __init__(self, name, dispatcher):
+        self.event_queues.add(self)
+
+        self.name = name
         self.dispatcher = dispatcher
         self.is_dispatching = False
         self.ev_q = Queue()
@@ -58,7 +69,15 @@ class EventQueue(object):
 
 
 class EventDispatcher(object):
+    # WeakSet: This set is populated by __init__().
+    #          So need to use weak reference in order to make instances
+    #          freeable by avoiding refrence count.
+    #          Otherwise, instances can't be freed.
+    event_dispatchers = weakref.WeakSet()
+
     def __init__(self, name):
+        self.event_dispatchers.add(self)
+
         self.name = name
         self.events = {}
         self.all_handlers = []

ryu/controller/handler.py

@@ -24,6 +24,7 @@ from ryu.lib.mac import haddr_to_bin
 
 LOG = logging.getLogger('ryu.controller.handler')
 
+QUEUE_NAME_OFP_MSG = 'ofp_msg'
 handshake_dispatcher = dispatcher.EventDispatcher('handshake')
 config_dispatcher = dispatcher.EventDispatcher('config')
 main_dispatcher = dispatcher.EventDispatcher('main')