channel.h

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/* Copyright (c) 2020, 2025, Oracle and/or its affiliates.
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
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This program is designed to work with certain software (including
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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#include <atomic>
#include <map>
#include <set>
#include <string>
#include "cache_allocator.h"
#include "reference_cache_common.h"
 
namespace reference_caching {
 
class channel_imp : public Cache_malloced {
 public:
  static channel_imp *create(service_names_set<> &service_names);
  static bool destroy(channel_imp *channel);
  static bool factory_init();
  static bool factory_deinit();
  static channel_imp *channel_by_name(std::string service_name);
 
  bool is_valid() { return m_valid; }
  void set_valid(bool new_value) {
    m_valid.store(new_value, std::memory_order_relaxed);
  }
 
  service_names_set<> &get_service_names() { return m_service_names; }
 
  void ignore_list_copy(service_names_set<> &dest_set);
  bool ignore_list_add(std::string service_implementation);
  bool ignore_list_remove(std::string service_implementation);
  bool ignore_list_clear();
 
  bool is_alone() { return m_reference_count == 1; }
  channel_imp *ref() {
    m_reference_count.fetch_add(1, std::memory_order_relaxed);
    return this;
  }
  int unref() {
    return m_reference_count.fetch_sub(1, std::memory_order_relaxed);
  }
  channel_imp(service_names_set<> &service_names)
      : m_has_ignore_list(false), m_valid{true}, m_reference_count{0} {
    m_service_names = service_names;
  }
  ~channel_imp() = default;
 
  bool operator==(channel_imp &other) const {
    return m_service_names == other.m_service_names;
  }
 
 private:
  // disable copy constructors
  channel_imp(const channel_imp &);
  channel_imp &operator=(const channel_imp &);
 
  service_names_set<> m_service_names;
  service_names_set<> m_ignore_list;
  std::atomic<bool> m_has_ignore_list;
  std::atomic<bool> m_valid;
  std::atomic<int> m_reference_count;
};
 
}  // namespace reference_caching