writer_base.h

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/******************************************************************************
 * Copyright 2018 The Apollo Authors. All Rights Reserved.
 *
 * 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 CYBER_NODE_WRITER_BASE_H_
#define CYBER_NODE_WRITER_BASE_H_
 
#include <atomic>
#include <mutex>
#include <string>
#include <vector>
 
#include "cyber/proto/role_attributes.pb.h"
 
namespace apollo {
namespace cyber {
 
class WriterBase {
 public:
  explicit WriterBase(const proto::RoleAttributes& role_attr)
      : role_attr_(role_attr), init_(false) {}
  virtual ~WriterBase() {}
 
  virtual bool Init() = 0;
 
  virtual void Shutdown() = 0;
 
  virtual bool HasReader() { return false; }
 
  virtual void GetReaders(std::vector<proto::RoleAttributes>* readers) {}
 
  const std::string& GetChannelName() const {
    return role_attr_.channel_name();
  }
 
  const uint64_t GetChannelId() const { return role_attr_.channel_id(); }
 
  bool IsInit() const {
    std::lock_guard<std::mutex> g(lock_);
    return init_;
  }
 
 protected:
  proto::RoleAttributes role_attr_;
  mutable std::mutex lock_;
  bool init_;
};
 
}  // namespace cyber
}  // namespace apollo
 
#endif  // CYBER_NODE_WRITER_BASE_H_