def get_api(self):
        cluster_id = None
        if self.backend_description.needs_cluster_id:
            cluster_id = self.node_credential.cluster_uuid
        return get_api(
            self.backend_description,
            self.api_args,
            self.reactor,
            cluster_id
        )
Registry.__iter__: returns list of (key, callable return value)
dataset/ETHPy150Open ClusterHQ/flocker/flocker/node/script.py/AgentService.get_api--crossover with--dataset/ETHPy150Open xtrementl/focus/tests/unit/test_registry.py/TestRegistry.testWithItems___iter__