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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_LEVELDB_DATABASE_H_
#define COMPONENTS_LEVELDB_PROTO_LEVELDB_DATABASE_H_
#include <memory>
#include <string>
#include <vector>
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/strings/string_split.h"
#include "base/threading/thread_collision_warner.h"
#include "base/trace_event/memory_dump_provider.h"
#include "components/leveldb_proto/options.h"
namespace base {
class FilePath;
class HistogramBase;
} // namespace base
namespace leveldb {
class Cache;
class DB;
class Env;
struct Options;
} // namespace leveldb
namespace leveldb_proto {
// Interacts with the LevelDB third party module.
// Once constructed, function calls and destruction should all occur on the
// same thread (not necessarily the same as the constructor).
class LevelDB : public base::trace_event::MemoryDumpProvider {
public:
// Constructor. Does *not* open a leveldb - only initialize this class.
// |client_name| is the name of the "client" that owns this instance. Used
// for UMA statics as so: LevelDB.<value>.<client name>. It is best to not
// change once shipped.
explicit LevelDB(const char* client_name);
~LevelDB() override;
// Initializes a leveldb with the given options. If |options.database_dir| is
// empty, this opens an in-memory db.
virtual bool Init(const leveldb_proto::Options& options);
virtual bool Save(const base::StringPairs& pairs_to_save,
const std::vector<std::string>& keys_to_remove);
virtual bool Load(std::vector<std::string>* entries);
virtual bool LoadKeys(std::vector<std::string>* keys);
virtual bool Get(const std::string& key, bool* found, std::string* entry);
static bool Destroy(const base::FilePath& database_dir);
// base::trace_event::MemoryDumpProvider implementation.
bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& dump_args,
base::trace_event::ProcessMemoryDump* pmd) override;
protected:
virtual bool InitWithOptions(const base::FilePath& database_dir,
const leveldb::Options& options);
private:
FRIEND_TEST_ALL_PREFIXES(ProtoDatabaseImplLevelDBTest, TestDBInitFail);
DFAKE_MUTEX(thread_checker_);
// The declaration order of these members matters: |db_| depends on |env_| and
// |custom_block_cache_| and therefore has to be destructed first.
std::unique_ptr<leveldb::Env> env_;
std::unique_ptr<leveldb::Cache> custom_block_cache_;
std::unique_ptr<leveldb::DB> db_;
base::HistogramBase* open_histogram_;
// Name of the client shown in chrome://tracing.
std::string client_name_;
DISALLOW_COPY_AND_ASSIGN(LevelDB);
};
} // namespace leveldb_proto
#endif // COMPONENTS_LEVELDB_PROTO_LEVELDB_DATABASE_H_
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