grpc1.45.2/include/grpcpp/impl/grpc_library.h

/*
 *
 * Copyright 2015 gRPC authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#ifndef GRPCPP_IMPL_GRPC_LIBRARY_H
#define GRPCPP_IMPL_GRPC_LIBRARY_H

#include <iostream>

#include <grpc/grpc.h>
#include <grpcpp/impl/codegen/config.h>
#include <grpcpp/impl/codegen/core_codegen.h>
#include <grpcpp/impl/codegen/grpc_library.h>  // IWYU pragma: export

namespace grpc {

namespace internal {
class GrpcLibrary final : public GrpcLibraryInterface {
 public:
  void init() override { grpc_init(); }
  void shutdown() override { grpc_shutdown(); }
};

/// Instantiating this class ensures the proper initialization of gRPC.
class GrpcLibraryInitializer final {
 public:
  GrpcLibraryInitializer() {
    if (grpc::g_glip == nullptr) {
      static auto* const g_gli = new GrpcLibrary();
      grpc::g_glip = g_gli;
    }
    if (grpc::g_core_codegen_interface == nullptr) {
      static auto* const g_core_codegen = new CoreCodegen();
      grpc::g_core_codegen_interface = g_core_codegen;
    }
  }

  /// A no-op method to force the linker to reference this class, which will
  /// take care of initializing and shutting down the gRPC runtime.
  int summon() { return 0; }
};

}  // namespace internal
}  // namespace grpc

#endif  // GRPCPP_IMPL_GRPC_LIBRARY_H