THUAI6/CAPI/cpp/grpc/include/grpcpp/impl/codegen/grpc_library.h

/*
 *
 * Copyright 2016 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_CODEGEN_GRPC_LIBRARY_H
#define GRPCPP_IMPL_CODEGEN_GRPC_LIBRARY_H

// IWYU pragma: private, include <grpcpp/impl/grpc_library.h>

#include <grpcpp/impl/codegen/core_codegen_interface.h>

namespace grpc
{

    class GrpcLibraryInterface
    {
    public:
        virtual ~GrpcLibraryInterface() = default;
        virtual void init() = 0;
        virtual void shutdown() = 0;
    };

    /// Initialized by \a grpc::GrpcLibraryInitializer from
    /// <grpcpp/impl/grpc_library.h>
    extern GrpcLibraryInterface* g_glip;

    /// Classes that require gRPC to be initialized should inherit from this class.
    class GrpcLibraryCodegen
    {
    public:
        explicit GrpcLibraryCodegen(bool call_grpc_init = true) :
            grpc_init_called_(false)
        {
            if (call_grpc_init)
            {
                GPR_CODEGEN_ASSERT(g_glip && "gRPC library not initialized. See "
                                             "grpc::internal::GrpcLibraryInitializer.");
                g_glip->init();
                grpc_init_called_ = true;
            }
        }
        virtual ~GrpcLibraryCodegen()
        {
            if (grpc_init_called_)
            {
                GPR_CODEGEN_ASSERT(g_glip && "gRPC library not initialized. See "
                                             "grpc::internal::GrpcLibraryInitializer.");
                g_glip->shutdown();
            }
        }

    private:
        bool grpc_init_called_;
    };

}  // namespace grpc

#endif  // GRPCPP_IMPL_CODEGEN_GRPC_LIBRARY_H