140 lines
3.7 KiB
C++
140 lines
3.7 KiB
C++
/******************************************************************************
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*
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* Copyright 2020 Google, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************/
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#pragma once
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#include <mutex>
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#include <string>
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#include <thread>
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#include <unordered_set>
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#include "raw_address.h"
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#include "lru.h"
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namespace bluetooth {
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namespace common {
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class MetricIdAllocator {
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public:
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using Callback = std::function<bool(const RawAddress& address, const int id)>;
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static const size_t kMaxNumUnpairedDevicesInMemory;
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static const size_t kMaxNumPairedDevicesInMemory;
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static const int kMinId;
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static const int kMaxId;
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~MetricIdAllocator();
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/**
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* Get the instance of singleton
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*
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* @return MetricIdAllocator&
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*/
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static MetricIdAllocator& GetInstance();
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/**
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* Initialize the allocator
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*
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* @param paired_device_map map from mac_address to id already saved
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* in the disk before init
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* @param save_id_callback a callback that will be called after successfully
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* saving id for a paired device
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* @param forget_device_callback a callback that will be called after
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* successful id deletion for forgotten device,
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* @return true if successfully initialized
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*/
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bool Init(const std::unordered_map<RawAddress, int>& paired_device_map,
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Callback save_id_callback, Callback forget_device_callback);
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/**
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* Close the allocator. should be called when Bluetooth process is killed
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*
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* @return true if successfully close
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*/
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bool Close();
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/**
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* Check if no id saved in memory
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*
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* @return true if no id is saved
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*/
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bool IsEmpty() const;
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/**
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* Allocate an id for a scanned device, or return the id if there is already
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* one
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*
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* @param mac_address mac address of Bluetooth device
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* @return the id of device
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*/
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int AllocateId(const RawAddress& mac_address);
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/**
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* Save the id for a paired device
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*
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* @param mac_address mac address of Bluetooth device
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* @return true if save successfully
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*/
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bool SaveDevice(const RawAddress& mac_address);
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/**
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* Delete the id for a device to be forgotten
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*
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* @param mac_address mac address of Bluetooth device
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*/
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void ForgetDevice(const RawAddress& mac_address);
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/**
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* Check if an id is valid.
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* The id should be less than or equal to kMaxId and bigger than or equal to
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* kMinId
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*
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* @param mac_address mac address of Bluetooth device
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* @return true if delete successfully
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*/
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static bool IsValidId(const int id);
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protected:
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// Singleton
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MetricIdAllocator();
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private:
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static const std::string LOGGING_TAG;
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mutable std::mutex id_allocator_mutex_;
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LegacyLruCache<RawAddress, int> paired_device_cache_;
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LegacyLruCache<RawAddress, int> temporary_device_cache_;
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std::unordered_set<int> id_set_;
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int next_id_{kMinId};
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bool initialized_{false};
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Callback save_id_callback_;
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Callback forget_device_callback_;
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void ForgetDevicePostprocess(const RawAddress& mac_address, const int id);
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// delete copy constructor for singleton
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MetricIdAllocator(MetricIdAllocator const&) = delete;
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MetricIdAllocator& operator=(MetricIdAllocator const&) = delete;
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};
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} // namespace common
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} // namespace bluetooth
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