rdb_transceiver_shm.hpp

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/*
 * Copyright 2020 Robert Bosch GmbH
 *
 * 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#pragma once
 
#include <memory>  // for unique_ptr<>
#include <vector>  // for vector<>
 
#include <boost/interprocess/mapped_region.hpp>  // for mapped_region
 
#include <cloe/core.hpp>  // for Json
 
#include "rdb_transceiver.hpp"  // for RdbTransceiver
 
namespace vtd {
 
class RdbTransceiverShm : public RdbTransceiver {
 public:
  RdbTransceiverShm(key_t key, uint32_t release_mask);
 
  virtual ~RdbTransceiverShm();
 
  bool has() const override {
    throw std::runtime_error("RdbTransceiverShm: has not implemented yet");
  }
 
  std::vector<std::shared_ptr<RDB_MSG_t>> receive() override;
 
  void send(const RDB_MSG_t*, size_t) override {
    throw std::runtime_error("RdbTransceiverShm: send not implemented");
  }
 
  void to_json(cloe::Json& j) const override {
    j = cloe::Json{
        {"connection_endpoint", "shm://unknown-key"},
        {"num_errors", this->num_errors_},
        {"num_messages", this->num_messages_},
    };
  }
 
  friend void to_json(cloe::Json& j, const RdbTransceiverShm& t) { t.to_json(j); }
 
 protected:
  uint32_t release_mask_;
 
  boost::interprocess::mapped_region region_;
 
  RDB_SHM_HDR_t* rdb_shm_hdr_{nullptr};
 
  RDB_SHM_BUFFER_INFO_t** buffer_info_{nullptr};
 
  RDB_MSG_t** rdb_msg_{nullptr};
 
  // Hold on to some cheap statistics for the JSON representation.
  uint64_t num_errors_{0};
  uint64_t num_messages_{0};
};
 
}  // namespace vtd