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/*
 *
 * Copyright 2016, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef GRPC_INTERNAL_CPP_SERVER_DEFAULT_HEALTH_CHECK_SERVICE_H
#define GRPC_INTERNAL_CPP_SERVER_DEFAULT_HEALTH_CHECK_SERVICE_H

#include <mutex>

#include <grpc++/health_check_service_interface.h>
#include <grpc++/impl/codegen/service_type.h>
#include <grpc++/support/byte_buffer.h>

namespace grpc {

// Default implementation of HealthCheckServiceInterface. Server will create and
// own it.
class DefaultHealthCheckService final : public HealthCheckServiceInterface {
 public:
  // The service impl to register with the server.
  class HealthCheckServiceImpl : public Service {
   public:
    explicit HealthCheckServiceImpl(DefaultHealthCheckService* service);

    Status Check(ServerContext* context, const ByteBuffer* request,
                 ByteBuffer* response);

   private:
    const DefaultHealthCheckService* const service_;
    RpcServiceMethod* method_;
  };

  DefaultHealthCheckService();
  void SetServingStatus(const grpc::string& service_name,
                        bool serving) override;
  void SetServingStatus(bool serving) override;
  enum ServingStatus { NOT_FOUND, SERVING, NOT_SERVING };
  ServingStatus GetServingStatus(const grpc::string& service_name) const;
  HealthCheckServiceImpl* GetHealthCheckService();

 private:
  mutable std::mutex mu_;
  std::map<grpc::string, bool> services_map_;
  std::unique_ptr<HealthCheckServiceImpl> impl_;
};

}  // namespace grpc

#endif  // GRPC_INTERNAL_CPP_SERVER_DEFAULT_HEALTH_CHECK_SERVICE_H