missive/util/dynamic_flag.cc

// Copyright 2023 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "missive/util/dynamic_flag.h"

#include <atomic>
#include <string>
#include <string_view>

#include <base/logging.h>

namespace reporting {

DynamicFlag::DynamicFlag(std::string_view name, bool is_enabled)
    : name_(name), is_enabled_(is_enabled) {
  LOG(WARNING) << "Flag `" << name_ << "` is initially "
               << (is_enabled ? "enabled" : "disabled");
}

DynamicFlag::~DynamicFlag() = default;

bool DynamicFlag::is_enabled() const {
  return is_enabled_.load();
}

void DynamicFlag::OnValueUpdate(bool is_enabled) {
  // Do nothing.
}

void DynamicFlag::SetValue(bool is_enabled) {
  const bool was_enabled = is_enabled_.exchange(is_enabled);
  if (was_enabled != is_enabled) {
    LOG(WARNING) << "Flag `" << name_ << "` flipped to "
                 << (is_enabled ? "enabled" : "disabled");
    OnValueUpdate(is_enabled);
  }
}
}  // namespace reporting