def add_listener(self, on_message=None):
"""Subscribes to this topic.
When someone publishes a message on this topic, ``on_message`` function is called if provided.
Args:
on_message (function): Function to be called when a message is published.
Returns:
hazelcast.future.Future[str]: A registration id which is used as a key to remove the listener.
"""
codec = topic_add_message_listener_codec
request = codec.encode_request(self.name, self._is_smart)
def handle(item, publish_time, uuid):
member = self._context.cluster_service.get_member(uuid)
item_event = TopicMessage(
self.name, item, publish_time / 1000.0, member, self._to_object
)
on_message(item_event)
return self._register_listener(
request,
lambda r: codec.decode_response(r),
lambda reg_id: topic_remove_message_listener_codec.encode_request(self.name, reg_id),
lambda m: codec.handle(m, handle),
)
def remove_listener(self, registration_id):
"""
Stops receiving messages for the given message listener. If the given listener already removed, this method does
nothing.
:param registration_id: (str), registration id of the listener to be removed.
:return: (bool), ``true`` if the listener is removed, ``false`` otherwise.
"""
return self._stop_listening(
registration_id,
lambda i: topic_remove_message_listener_codec.encode_request(
self.name, i))
def add_listener(self, on_message=None):
"""
Subscribes to this topic. When someone publishes a message on this topic, on_message() function is called if
provided.
:param on_message: (Function), function to be called when a message is published.
:return: (str), a registration id which is used as a key to remove the listener.
"""
request = topic_add_message_listener_codec.encode_request(
self.name, self._is_smart)
def handle(item, publish_time, uuid):
member = self._client.cluster.get_member_by_uuid(uuid)
item_event = TopicMessage(self.name, item, publish_time, member,
self._to_object)
on_message(item_event)
return self._register_listener(
request, lambda r: topic_add_message_listener_codec.
decode_response(r)['response'],
lambda reg_id: topic_remove_message_listener_codec.encode_request(
self.name, reg_id),
lambda m: topic_add_message_listener_codec.handle(m, handle))
def remove_listener(self, registration_id):
return self._stop_listening(
registration_id,
lambda i: topic_remove_message_listener_codec.encode_request(
self.name, i))
def remove_listener(self, registration_id):
return self._stop_listening(registration_id,
lambda i: topic_remove_message_listener_codec.encode_request(self.name, i))