1 /* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 #ifndef KVSTORE_META_MANAGER_H 16 #define KVSTORE_META_MANAGER_H 17 18 #include <mutex> 19 20 #include "app_device_change_listener.h" 21 #include "executor_pool.h" 22 #include "kv_store_delegate.h" 23 #include "kv_store_delegate_manager.h" 24 #include "system_ability.h" 25 #include "types.h" 26 27 namespace OHOS { 28 namespace DistributedKv { 29 enum class CHANGE_FLAG { 30 INSERT, 31 UPDATE, 32 DELETE 33 }; 34 35 class KvStoreMetaManager { 36 public: 37 static constexpr uint32_t META_STORE_VERSION = 0x03000001; 38 using ChangeObserver = std::function<void(const std::vector<uint8_t> &, const std::vector<uint8_t> &, CHANGE_FLAG)>; 39 40 class MetaDeviceChangeListenerImpl : public AppDistributedKv::AppDeviceChangeListener { 41 void OnDeviceChanged(const AppDistributedKv::DeviceInfo &info, 42 const AppDistributedKv::DeviceChangeType &type) const override; 43 44 AppDistributedKv::ChangeLevelType GetChangeLevelType() const override; 45 }; 46 47 ~KvStoreMetaManager(); 48 49 static KvStoreMetaManager &GetInstance(); 50 51 void InitMetaParameter(); 52 void InitMetaListener(); 53 void InitBroadcast(); 54 void InitDeviceOnline(); 55 void SubscribeMeta(const std::string &keyPrefix, const ChangeObserver &observer); 56 size_t GetSyncDataSize(const std::string &deviceId); 57 void BindExecutor(std::shared_ptr<ExecutorPool> executors); 58 private: 59 using NbDelegate = std::shared_ptr<DistributedDB::KvStoreNbDelegate>; 60 NbDelegate GetMetaKvStore(); 61 62 NbDelegate CreateMetaKvStore(); 63 64 void ConfigMetaDataManager(); 65 66 KvStoreMetaManager(); 67 68 void InitMetaData(); 69 70 void SubscribeMetaKvStore(); 71 72 void SyncMeta(); 73 74 std::string GetBackupPath() const; 75 76 ExecutorPool::Task GetTask(uint32_t retry); 77 78 class KvStoreMetaObserver : public DistributedDB::KvStoreObserver { 79 public: 80 virtual ~KvStoreMetaObserver(); 81 82 // Database change callback 83 void OnChange(const DistributedDB::KvStoreChangedData &data) override; 84 std::map<std::string, ChangeObserver> handlerMap_; 85 private: 86 void HandleChanges(CHANGE_FLAG flag, const std::list<DistributedDB::Entry> &entries); 87 }; 88 89 static constexpr int32_t RETRY_MAX_TIMES = 100; 90 static constexpr int32_t RETRY_INTERVAL = 1; 91 NbDelegate metaDelegate_; 92 std::string metaDBDirectory_; 93 const std::string label_; 94 DistributedDB::KvStoreDelegateManager delegateManager_; 95 static MetaDeviceChangeListenerImpl listener_; 96 KvStoreMetaObserver metaObserver_; 97 std::recursive_mutex mutex_; 98 std::shared_ptr<ExecutorPool> executors_; 99 }; 100 } // namespace DistributedKv 101 } // namespace OHOS 102 #endif // KVSTORE_META_MANAGER_H 103