ClientSettings.h

#pragma once

#include <string>
#include <utility>
#include <vector>

#include <folly/Optional.h>

namespace facebook { namespace logdevice {

class ClientSettingsImpl; // private implementation

class ClientSettings {
 public:
  static ClientSettings* create();

  virtual ~ClientSettings() {}

  int set(const char* name, const char* value);

  // Overload for std::string
  int set(const std::string& name, const std::string& value) {
    return set(name.c_str(), value.c_str());
  }

  // Overload for settings with integral settings, for convenience
  int set(const char* name, int64_t value);

  int set(const std::vector<std::pair<std::string, std::string>>& settings);

  folly::Optional<std::string> get(const std::string& name);

  bool isOverridden(const std::string& name);

  std::vector<std::pair<std::string, std::string>> getAll();

 private:
  ClientSettings() {}

  friend class ClientSettingsImpl;
  ClientSettingsImpl* impl(); // downcasts (this)
};

}} // namespace facebook::logdevice