1 // 2 // Copyright 2015 gRPC authors. 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 // 16 17 #ifndef GRPC_SRC_CORE_LOAD_BALANCING_LB_POLICY_FACTORY_H 18 #define GRPC_SRC_CORE_LOAD_BALANCING_LB_POLICY_FACTORY_H 19 20 #include <grpc/support/port_platform.h> 21 22 #include "absl/status/statusor.h" 23 #include "absl/strings/string_view.h" 24 #include "src/core/load_balancing/lb_policy.h" 25 #include "src/core/util/json/json.h" 26 #include "src/core/util/orphanable.h" 27 #include "src/core/util/ref_counted_ptr.h" 28 29 namespace grpc_core { 30 31 class LoadBalancingPolicyFactory { 32 public: ~LoadBalancingPolicyFactory()33 virtual ~LoadBalancingPolicyFactory() {} 34 35 /// Returns a new LB policy instance. 36 virtual OrphanablePtr<LoadBalancingPolicy> CreateLoadBalancingPolicy( 37 LoadBalancingPolicy::Args) const = 0; 38 39 /// Returns the LB policy name that this factory provides. 40 virtual absl::string_view name() const = 0; 41 42 virtual absl::StatusOr<RefCountedPtr<LoadBalancingPolicy::Config>> 43 ParseLoadBalancingConfig(const Json& json) const = 0; 44 }; 45 46 } // namespace grpc_core 47 48 #endif // GRPC_SRC_CORE_LOAD_BALANCING_LB_POLICY_FACTORY_H 49