| // Copyright 2018 The Chromium 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 COMPONENTS_LEVELDB_PROTO_INTERNAL_SHARED_PROTO_DATABASE_PROVIDER_H_ |
| #define COMPONENTS_LEVELDB_PROTO_INTERNAL_SHARED_PROTO_DATABASE_PROVIDER_H_ |
| |
| #include "base/component_export.h" |
| #include "base/memory/weak_ptr.h" |
| #include "base/sequenced_task_runner.h" |
| |
| namespace leveldb_proto { |
| |
| class SharedProtoDatabase; |
| class ProtoDatabaseProvider; |
| |
| // Helper class to be instantiated for each request for a shared database |
| // provider to be used in the wrapper. |client_task_runner| is the |
| // SequencedTaskRunner provided by the main provider so its WeakPtrs are |
| // always checked on the right sequence. |
| class COMPONENT_EXPORT(LEVELDB_PROTO) SharedProtoDatabaseProvider { |
| public: |
| using GetSharedDBInstanceCallback = |
| base::OnceCallback<void(scoped_refptr<SharedProtoDatabase>)>; |
| |
| ~SharedProtoDatabaseProvider(); |
| |
| void GetDBInstance( |
| GetSharedDBInstanceCallback callback, |
| scoped_refptr<base::SequencedTaskRunner> callback_task_runner); |
| |
| private: |
| friend class ProtoDatabaseProvider; |
| friend class TestSharedProtoDatabaseProvider; |
| |
| SharedProtoDatabaseProvider( |
| const scoped_refptr<base::SequencedTaskRunner>& client_task_runner, |
| base::WeakPtr<ProtoDatabaseProvider> provider_weak_ptr); |
| |
| scoped_refptr<base::SequencedTaskRunner> client_task_runner_; |
| base::WeakPtr<ProtoDatabaseProvider> provider_weak_ptr_; |
| }; |
| |
| } // namespace leveldb_proto |
| |
| #endif // COMPONENTS_LEVELDB_PROTO_INTERNAL_SHARED_PROTO_DATABASE_PROVIDER_H_ |