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// Copyright 2014 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_PROTO_DATABASE_IMPL_H_
#define COMPONENTS_LEVELDB_PROTO_PROTO_DATABASE_IMPL_H_
#include <string>
#include <vector>
#include "base/bind.h"
#include "base/files/file_path.h"
#include "base/memory/scoped_ptr.h"
#include "base/message_loop/message_loop.h"
#include "base/sequenced_task_runner.h"
#include "base/strings/string_util.h"
#include "base/threading/sequenced_worker_pool.h"
#include "base/threading/thread_checker.h"
#include "base/strings/string_split.h"
#include "components/leveldb_proto/leveldb_database.h"
#include "components/leveldb_proto/proto_database.h"
namespace leveldb_proto {
using KeyValueVector = base::StringPairs;
using KeyVector = std::vector<std::string>;
// When the ProtoDatabaseImpl instance is deleted, in-progress asynchronous
// operations will be completed and the corresponding callbacks will be called.
// Construction/calls/destruction should all happen on the same thread.
template <typename T>
class ProtoDatabaseImpl : public ProtoDatabase<T> {
public:
// All blocking calls/disk access will happen on the provided |task_runner|.
explicit ProtoDatabaseImpl(
const scoped_refptr<base::SequencedTaskRunner>& task_runner);
~ProtoDatabaseImpl() override;
// ProtoDatabase implementation.
// TODO(cjhopman): Perhaps Init() shouldn't be exposed to users and not just
// part of the constructor
void Init(const base::FilePath& database_dir,
const typename ProtoDatabase<T>::InitCallback& callback) override;
void UpdateEntries(
scoped_ptr<typename ProtoDatabase<T>::KeyEntryVector> entries_to_save,
scoped_ptr<KeyVector> keys_to_remove,
const typename ProtoDatabase<T>::UpdateCallback& callback) override;
void LoadEntries(
const typename ProtoDatabase<T>::LoadCallback& callback) override;
// Allow callers to provide their own Database implementation.
void InitWithDatabase(
scoped_ptr<LevelDB> database,
const base::FilePath& database_dir,
const typename ProtoDatabase<T>::InitCallback& callback);
private:
base::ThreadChecker thread_checker_;
// Used to run blocking tasks in-order.
scoped_refptr<base::SequencedTaskRunner> task_runner_;
scoped_ptr<LevelDB> db_;
DISALLOW_COPY_AND_ASSIGN(ProtoDatabaseImpl);
};
namespace {
template <typename T>
void RunInitCallback(const typename ProtoDatabase<T>::InitCallback& callback,
const bool* success) {
callback.Run(*success);
}
template <typename T>
void RunUpdateCallback(
const typename ProtoDatabase<T>::UpdateCallback& callback,
const bool* success) {
callback.Run(*success);
}
template <typename T>
void RunLoadCallback(const typename ProtoDatabase<T>::LoadCallback& callback,
const bool* success,
scoped_ptr<std::vector<T>> entries) {
callback.Run(*success, entries.Pass());
}
void InitFromTaskRunner(LevelDB* database, const base::FilePath& database_dir,
bool* success) {
DCHECK(success);
// TODO(cjhopman): Histogram for database size.
*success = database->Init(database_dir);
}
template <typename T>
void UpdateEntriesFromTaskRunner(
LevelDB* database,
scoped_ptr<typename ProtoDatabase<T>::KeyEntryVector> entries_to_save,
scoped_ptr<KeyVector> keys_to_remove,
bool* success) {
DCHECK(success);
// Serialize the values from Proto to string before passing on to database.
KeyValueVector pairs_to_save;
for (const auto& pair : *entries_to_save) {
pairs_to_save.push_back(
std::make_pair(pair.first, pair.second.SerializeAsString()));
}
*success = database->Save(pairs_to_save, *keys_to_remove);
}
template <typename T>
void LoadEntriesFromTaskRunner(LevelDB* database,
std::vector<T>* entries,
bool* success) {
DCHECK(success);
DCHECK(entries);
entries->clear();
std::vector<std::string> loaded_entries;
*success = database->Load(&loaded_entries);
for (const auto& serialized_entry : loaded_entries) {
T entry;
if (!entry.ParseFromString(serialized_entry)) {
DLOG(WARNING) << "Unable to parse leveldb_proto entry";
// TODO(cjhopman): Decide what to do about un-parseable entries.
}
entries->push_back(entry);
}
}
} // namespace
template <typename T>
ProtoDatabaseImpl<T>::ProtoDatabaseImpl(
const scoped_refptr<base::SequencedTaskRunner>& task_runner)
: task_runner_(task_runner) {}
template <typename T>
ProtoDatabaseImpl<T>::~ProtoDatabaseImpl() {
DCHECK(thread_checker_.CalledOnValidThread());
if (!task_runner_->DeleteSoon(FROM_HERE, db_.release()))
DLOG(WARNING) << "Proto database will not be deleted.";
}
template <typename T>
void ProtoDatabaseImpl<T>::Init(
const base::FilePath& database_dir,
const typename ProtoDatabase<T>::InitCallback& callback) {
DCHECK(thread_checker_.CalledOnValidThread());
InitWithDatabase(make_scoped_ptr(new LevelDB()), database_dir, callback);
}
template <typename T>
void ProtoDatabaseImpl<T>::InitWithDatabase(
scoped_ptr<LevelDB> database,
const base::FilePath& database_dir,
const typename ProtoDatabase<T>::InitCallback& callback) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(!db_);
DCHECK(database);
db_.reset(database.release());
bool* success = new bool(false);
task_runner_->PostTaskAndReply(
FROM_HERE, base::Bind(InitFromTaskRunner, base::Unretained(db_.get()),
database_dir, success),
base::Bind(RunInitCallback<T>, callback, base::Owned(success)));
}
template <typename T>
void ProtoDatabaseImpl<T>::UpdateEntries(
scoped_ptr<typename ProtoDatabase<T>::KeyEntryVector> entries_to_save,
scoped_ptr<KeyVector> keys_to_remove,
const typename ProtoDatabase<T>::UpdateCallback& callback) {
DCHECK(thread_checker_.CalledOnValidThread());
bool* success = new bool(false);
task_runner_->PostTaskAndReply(
FROM_HERE,
base::Bind(UpdateEntriesFromTaskRunner<T>, base::Unretained(db_.get()),
base::Passed(&entries_to_save), base::Passed(&keys_to_remove),
success),
base::Bind(RunUpdateCallback<T>, callback, base::Owned(success)));
}
template <typename T>
void ProtoDatabaseImpl<T>::LoadEntries(
const typename ProtoDatabase<T>::LoadCallback& callback) {
DCHECK(thread_checker_.CalledOnValidThread());
bool* success = new bool(false);
scoped_ptr<std::vector<T> > entries(new std::vector<T>());
// Get this pointer before entries is base::Passed() so we can use it below.
std::vector<T>* entries_ptr = entries.get();
task_runner_->PostTaskAndReply(
FROM_HERE, base::Bind(LoadEntriesFromTaskRunner<T>,
base::Unretained(db_.get()), entries_ptr, success),
base::Bind(RunLoadCallback<T>, callback, base::Owned(success),
base::Passed(&entries)));
}
} // namespace leveldb_proto
#endif // COMPONENTS_LEVELDB_PROTO_PROTO_DATABASE_IMPL_H_
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