How to use the dapr.serializers.DefaultJSONSerializer function in dapr

def setUp(self):
        ActorRuntime._actor_managers = {}
        ActorRuntime.set_actor_config(ActorRuntimeConfig())
        self._serializer = DefaultJSONSerializer()
        _run(ActorRuntime.register_actor(FakeSimpleActor))
        _run(ActorRuntime.register_actor(FakeMultiInterfacesActor))

def setUp(self):
        self._test_type_info = ActorTypeInformation.create(FakeMultiInterfacesActor)
        self._serializer = DefaultJSONSerializer()

        self._fake_client = FakeDaprActorClient
        self._runtime_ctx = ActorRuntimeContext(
            self._test_type_info, self._serializer,
            self._serializer, self._fake_client)
        self._manager = ActorManager(self._runtime_ctx)

def create(self, actor_interface,
               actor_type, actor_id) -> ActorProxy:
        return ActorProxy(self._dapr_client, actor_interface,
                          actor_type, actor_id, DefaultJSONSerializer())

def setUp(self):
        ActorRuntime._actor_managers = {}
        ActorRuntime.set_actor_config(ActorRuntimeConfig())
        self._serializer = DefaultJSONSerializer()
        _run(ActorRuntime.register_actor(FakeSimpleActor))
        _run(ActorRuntime.register_actor(FakeMultiInterfacesActor))

def setUp(self):
        self._testActorTypeInfo = ActorTypeInformation.create(FakeSimpleActor)
        self._serializer = DefaultJSONSerializer()
        self._fake_client = FakeDaprActorClient
        self._fake_runtime_ctx = ActorRuntimeContext(
            self._testActorTypeInfo, self._serializer,
            self._serializer, self._fake_client)

async def register_actor(
            cls, actor: Type[Actor],
            message_serializer: Serializer = DefaultJSONSerializer(),
            state_serializer: Serializer = DefaultJSONSerializer()) -> None:
        """Registers an :class:`Actor` object with the runtime.

        Args:
            actor (:class:`Actor`): Actor implementation.
            message_serializer (:class:`Serializer`): A serializer that serializes message
                between actors.
            state_serializer (:class:`Serializer`): Serializer that serializes state values.
        """
        type_info = ActorTypeInformation.create(actor)
        # TODO: We will allow to use gRPC client later.
        actor_client = DaprActorHttpClient()
        ctx = ActorRuntimeContext(type_info, message_serializer, state_serializer, actor_client)

        # Create an ActorManager, override existing entry if registered again.
        async with cls._actor_managers_lock:

async def register_actor(
            cls, actor: Type[Actor],
            message_serializer: Serializer = DefaultJSONSerializer(),
            state_serializer: Serializer = DefaultJSONSerializer()) -> None:
        """Registers an :class:`Actor` object with the runtime.

        Args:
            actor (:class:`Actor`): Actor implementation.
            message_serializer (:class:`Serializer`): A serializer that serializes message
                between actors.
            state_serializer (:class:`Serializer`): Serializer that serializes state values.
        """
        type_info = ActorTypeInformation.create(actor)
        # TODO: We will allow to use gRPC client later.
        actor_client = DaprActorHttpClient()
        ctx = ActorRuntimeContext(type_info, message_serializer, state_serializer, actor_client)

        # Create an ActorManager, override existing entry if registered again.
        async with cls._actor_managers_lock:
            cls._actor_managers[type_info.type_name] = ActorManager(ctx)

    def __init__(self, message_serializer=DefaultJSONSerializer()):
        # TODO: support serializer for state store later
        self._dapr_client = DaprActorHttpClient()
        self._message_serializer = message_serializer

def __init__(
            self,
            actor_client: DaprActorClientBase,
            state_serializer: Serializer = None):
        self._state_client = actor_client
        self._state_serializer = state_serializer or DefaultJSONSerializer()

def __init__(self, timeout=60):
        self._timeout = aiohttp.ClientTimeout(total=timeout)
        self._serializer = DefaultJSONSerializer()