| // Copyright 2018 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef SRC_LEDGER_BIN_STORAGE_IMPL_LEVELDB_FACTORY_H_ |
| #define SRC_LEDGER_BIN_STORAGE_IMPL_LEVELDB_FACTORY_H_ |
| |
| #include <lib/async_promise/executor.h> |
| #include <lib/fit/bridge.h> |
| #include <lib/fit/promise.h> |
| |
| #include <memory> |
| |
| #include "src/ledger/bin/environment/environment.h" |
| #include "src/ledger/bin/filesystem/detached_path.h" |
| #include "src/ledger/bin/storage/impl/leveldb.h" |
| #include "src/ledger/bin/storage/public/db_factory.h" |
| #include "src/lib/fxl/memory/weak_ptr.h" |
| |
| namespace storage { |
| |
| // A factory for LevelDb instances. |
| // |
| // This factory tries to always keep a new empty instance of LevelDb, |
| // initialized and pre-cached, in order to immediately respond to requests for |
| // new Db instances. |
| // |
| // When creating new LevelDb instances, using |GetOrCreateDb|, the caller should |
| // make sure that there is no live LevelDb instance for the same path. |
| class LevelDbFactory : public DbFactory { |
| public: |
| LevelDbFactory(ledger::Environment* environment, |
| ledger::DetachedPath cache_path); |
| |
| ~LevelDbFactory() override; |
| |
| // Initializes the LevelDbFactory by preparing the cached instance of LevelDb. |
| void Init(); |
| |
| // DbFactory: |
| void GetOrCreateDb( |
| ledger::DetachedPath db_path, DbFactory::OnDbNotFound on_db_not_found, |
| fit::function<void(Status, std::unique_ptr<Db>)> callback) override; |
| |
| private: |
| // IOLevelDbFactory holds all operations happening on the IO thread. |
| class IOLevelDbFactory; |
| |
| std::unique_ptr<IOLevelDbFactory> io_level_db_factory_; |
| async::Executor main_executor_; |
| |
| FXL_DISALLOW_COPY_AND_ASSIGN(LevelDbFactory); |
| }; |
| |
| } // namespace storage |
| |
| #endif // SRC_LEDGER_BIN_STORAGE_IMPL_LEVELDB_FACTORY_H_ |