def setup_mcast(self):
self.groups = {}
nodes_keys = self.nodes.keys()
nodes_keys.sort()
# Populate <code>groups</code> with metadata of groups which the
# current process is part of.
# gid(key) : unique group ID of the group (globally unique)
# mid : member ID of the current process in the group (group-wise unique)
# members : group members (names) in sorted order
for owner, members in self.group_owners.iteritems():
members.sort()
if self.local_name in members:
gid = nodes_keys.index(owner)
mid = members.index(self.local_name)
self.groups[gid] = {
'members' : members,
'mid' : mid,
}
# More metadata
for gid,g in self.groups.iteritems():
g['mcast_id'] = 1
g['latest_seqids_nodes'] = {}
for k in g['members']:
g['latest_seqids_nodes'][k] = 0
g['hold_back_queue'] = []
g['mcast_msgs_sent'] = {}
# Initialize multicast clock service
cs_factory = ClockServiceFactory()
cs_factory.set_nodes(len(g['members'])) # No. of nodes in the group
cs_factory.set_host_node_id(g['mid']) # Member ID for *this* process
g['mcast_vector_clock'] = cs_factory.get_clock("VECTOR")
# Reference to group owned by this process
self.mcast_group = self.groups[self.nid]
# Hold back queue required for causal ordering of message delivery
self.co_hold_back_queue = []
# Event to notify of new messages on hold back queue for causal ordering
self.new_messages_event = threading.Event()
msg = mp.receive()
time.sleep(0.5) # Sleep for half-a-second
if __name__ == '__main__':
if len(sys.argv) == 3:
config_filename = sys.argv[1]
local_name = sys.argv[2]
mp = MessagePasser(config_filename, local_name)
mp.update_config()
# Update K
K = len(mp.mcast_group['members'])
# Initialize the clock service here
# Should be done AFTER update_config() on MessagePasser
cs_factory = ClockServiceFactory()
cs_factory.set_nodes(len(mp.nodes)) # No. of nodes in the system
cs_factory.set_host_node_id(mp.nid) # ID for *this* process
# Uncomment for Vector Clock
cs = cs_factory.get_clock("VECTOR")
# Inject Clock Service into MessagePasser
mp.set_clockservice(cs)
# Start server thread(s)
send_msgs_thread = threading.Thread(name="send_msgs_thread", target=mp.process_send_queue)
recv_msgs_thread = threading.Thread(name="recv_msgs_thread", target=mp.receive_message)
mcast_recv_msgs_thread = threading.Thread(name="mcast_recv_msgs_thread", target=mp.mcast_receive)
co_deliver_msgs_thread = threading.Thread(name="co_deliver_msgs_thread", target=mp.co_deliver)
send_msgs_thread.start()
recv_msgs_thread.start()
