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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_LEVELDB_PROTO_PUBLIC_PROTO_DATABASE_PROVIDER_H_
#define COMPONENTS_LEVELDB_PROTO_PUBLIC_PROTO_DATABASE_PROVIDER_H_
#include <memory>
#include "base/component_export.h"
#include "base/files/file_path.h"
#include "base/memory/ptr_util.h"
#include "base/task/sequenced_task_runner.h"
#include "base/time/time.h"
#include "components/keyed_service/core/keyed_service.h"
#include "components/leveldb_proto/internal/proto_database_impl.h"
#include "components/leveldb_proto/internal/shared_proto_database_provider.h"
#include "components/leveldb_proto/public/proto_database.h"
#include "components/leveldb_proto/public/shared_proto_database_client_list.h"
namespace leveldb_proto {
class SharedProtoDatabase;
// Class that provides instances of ProtoDatabase tied to the current
// profile directory.
class COMPONENT_EXPORT(LEVELDB_PROTO) ProtoDatabaseProvider {
public:
using GetSharedDBInstanceCallback =
base::OnceCallback<void(scoped_refptr<SharedProtoDatabase>)>;
// Retrieve a unique database located in |db_dir|. |db_type| is used to record
// metrics, converting with
// SharedProtoDatabaseClientList::ProtoDbTypeToString. |task_runner| is used
// to run all database operations on.
// Should only be used in cases when the data is not tied to a specific
// profile.
template <typename P, typename T = P>
static std::unique_ptr<ProtoDatabase<P, T>> GetUniqueDB(
ProtoDbType db_type,
const base::FilePath& db_dir,
const scoped_refptr<base::SequencedTaskRunner>& task_runner) {
return std::make_unique<ProtoDatabaseImpl<P, T>>(db_type, db_dir,
task_runner);
}
// Do not create this directly, instead retrieve from StoragePartition (or
// BrowserState in iOS) to ensure there's only one per context.
explicit ProtoDatabaseProvider(const base::FilePath& profile_dir,
bool is_in_memory = false);
// |db_type|: Each database should have a type specified in ProtoDbType enum.
// This type is used to index data in the shared database. |unique_db_dir|:
// the subdirectory this database should live in within the profile directory.
// |task_runner|: the SequencedTaskRunner to run all database operations on.
// This isn't used by SharedProtoDatabaseClients since all calls using
// the SharedProtoDatabase will run on its TaskRunner.
template <typename P, typename T = P>
std::unique_ptr<ProtoDatabase<P, T>> GetDB(
ProtoDbType db_type,
const base::FilePath& unique_db_dir,
const scoped_refptr<base::SequencedTaskRunner>& task_runner);
ProtoDatabaseProvider(const ProtoDatabaseProvider&) = delete;
ProtoDatabaseProvider& operator=(const ProtoDatabaseProvider&) = delete;
virtual ~ProtoDatabaseProvider();
// This method is thread safe.
void SetSharedDBDeleteObsoleteDelayForTesting(base::TimeDelta delay);
private:
friend class TestProtoDatabaseProvider;
template <typename T_>
friend class ProtoDatabaseImplTest;
friend class SharedProtoDatabaseProvider;
virtual void GetSharedDBInstance(
GetSharedDBInstanceCallback callback,
scoped_refptr<base::SequencedTaskRunner> callback_task_runner);
base::FilePath profile_dir_;
const bool is_in_memory_;
scoped_refptr<SharedProtoDatabase> db_;
base::Lock get_db_lock_;
// We store the creation sequence because the SharedProtoDatabaseProvider uses
// it to make requests to the main provider that rely on WeakPtrs from here,
// so they're all invalidated/checked on the same sequence.
scoped_refptr<base::SequencedTaskRunner> client_task_runner_;
base::WeakPtrFactory<ProtoDatabaseProvider> weak_factory_{this};
};
template <typename P, typename T>
std::unique_ptr<ProtoDatabase<P, T>> ProtoDatabaseProvider::GetDB(
ProtoDbType db_type,
const base::FilePath& unique_db_dir,
const scoped_refptr<base::SequencedTaskRunner>& task_runner) {
if (is_in_memory_) {
DLOG(ERROR) << "In memory database cannot use the given database directory";
return GetUniqueDB<P, T>(db_type, base::FilePath(), task_runner);
}
return std::make_unique<ProtoDatabaseImpl<P, T>>(
db_type, unique_db_dir, task_runner,
base::WrapUnique(new SharedProtoDatabaseProvider(
client_task_runner_, weak_factory_.GetWeakPtr())));
}
} // namespace leveldb_proto
#endif // COMPONENTS_LEVELDB_PROTO_PUBLIC_PROTO_DATABASE_PROVIDER_H_
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