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/*
* Copyright 2022 The Android Open Source Project
*
* 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.
*/
#pragma once
#include <functional>
#include <mutex>
#include <unordered_map>
namespace netsim::controller {
class DeviceNotifyManager {
public:
DeviceNotifyManager(const DeviceNotifyManager &) = delete;
DeviceNotifyManager &operator=(const DeviceNotifyManager &) = delete;
DeviceNotifyManager(DeviceNotifyManager &&) = delete;
DeviceNotifyManager &operator=(DeviceNotifyManager &&) = delete;
static DeviceNotifyManager &Get() {
static DeviceNotifyManager *kInstance = new DeviceNotifyManager();
return *kInstance;
}
// Register a callback from an observer.
unsigned int Register(std::function<void(void)> callback);
// Unregister a callback from an observer.
void Unregister(unsigned int callback_id);
// Notify observers for device updates.
void Notify();
private:
DeviceNotifyManager() =
default; // Disallow instantiation outside of the class.
std::unordered_map<unsigned int, std::function<void(void)>>
registered_callbacks_;
std::mutex mutex_;
static unsigned int next_available_callback_id_;
};
} // namespace netsim::controller