/**
 *
 * Copyright 2018 Google LLC
 *
 * 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
 *
 *     https://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 NET_GRPC_GATEWAY_FRONTEND_FRONTEND_H_
#define NET_GRPC_GATEWAY_FRONTEND_FRONTEND_H_

#include <memory>

#include "net/grpc/gateway/backend/backend.h"
#include "net/grpc/gateway/runtime/response.h"

namespace grpc {
namespace gateway {

class Frontend : public std::enable_shared_from_this<Frontend> {
 public:
  explicit Frontend(std::unique_ptr<Backend> backend);
  virtual ~Frontend();
  Frontend(const Frontend&) = delete;
  Frontend& operator=(const Frontend&) = delete;

  // Start the frontend proxy progress.
  virtual void Start() = 0;

  // Send response to client.
  virtual void Send(std::unique_ptr<Response> response) = 0;

 protected:
  Backend* backend() { return backend_.get(); }
  std::shared_ptr<Frontend> shared_ptr() { return shared_from_this(); }

 private:
  std::unique_ptr<Backend> backend_;
};
}  // namespace gateway
}  // namespace grpc
#endif  // NET_GRPC_GATEWAY_FRONTEND_FRONTEND_H_