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// Copyright (c) 2013 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 CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_DATABASE_H_
#define CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_DATABASE_H_
#include <string>
#include "base/files/file_path.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/strings/string16.h"
#include "base/strings/string_piece.h"
#include "base/trace_event/memory_dump_provider.h"
#include "content/common/content_export.h"
#include "third_party/leveldatabase/src/include/leveldb/comparator.h"
#include "third_party/leveldatabase/src/include/leveldb/status.h"
namespace leveldb {
class Comparator;
class DB;
class FilterPolicy;
class Env;
class Snapshot;
}
namespace content {
class LevelDBComparator;
class LevelDBDatabase;
class LevelDBIterator;
class LevelDBWriteBatch;
class LevelDBSnapshot {
private:
friend class LevelDBDatabase;
friend class LevelDBTransaction;
explicit LevelDBSnapshot(LevelDBDatabase* db);
~LevelDBSnapshot();
leveldb::DB* db_;
const leveldb::Snapshot* snapshot_;
DISALLOW_COPY_AND_ASSIGN(LevelDBSnapshot);
};
class CONTENT_EXPORT LevelDBLock {
public:
LevelDBLock() {}
virtual ~LevelDBLock() {}
private:
DISALLOW_COPY_AND_ASSIGN(LevelDBLock);
};
class CONTENT_EXPORT LevelDBDatabase
: public base::trace_event::MemoryDumpProvider {
public:
class ComparatorAdapter : public leveldb::Comparator {
public:
explicit ComparatorAdapter(const LevelDBComparator* comparator);
int Compare(const leveldb::Slice& a,
const leveldb::Slice& b) const override;
const char* Name() const override;
void FindShortestSeparator(std::string* start,
const leveldb::Slice& limit) const override;
void FindShortSuccessor(std::string* key) const override;
private:
const LevelDBComparator* comparator_;
};
static leveldb::Status Open(const base::FilePath& file_name,
const LevelDBComparator* comparator,
scoped_ptr<LevelDBDatabase>* db,
bool* is_disk_full = 0);
static scoped_ptr<LevelDBDatabase> OpenInMemory(
const LevelDBComparator* comparator);
static leveldb::Status Destroy(const base::FilePath& file_name);
static scoped_ptr<LevelDBLock> LockForTesting(
const base::FilePath& file_name);
~LevelDBDatabase() override;
leveldb::Status Put(const base::StringPiece& key, std::string* value);
leveldb::Status Remove(const base::StringPiece& key);
virtual leveldb::Status Get(const base::StringPiece& key,
std::string* value,
bool* found,
const LevelDBSnapshot* = 0);
leveldb::Status Write(const LevelDBWriteBatch& write_batch);
scoped_ptr<LevelDBIterator> CreateIterator(const LevelDBSnapshot* = 0);
const LevelDBComparator* Comparator() const;
void Compact(const base::StringPiece& start, const base::StringPiece& stop);
void CompactAll();
// base::trace_event::MemoryDumpProvider implementation.
bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
base::trace_event::ProcessMemoryDump* pmd) override;
protected:
LevelDBDatabase();
private:
friend class LevelDBSnapshot;
void CloseDatabase();
scoped_ptr<leveldb::Env> env_;
scoped_ptr<leveldb::Comparator> comparator_adapter_;
scoped_ptr<leveldb::DB> db_;
scoped_ptr<const leveldb::FilterPolicy> filter_policy_;
const LevelDBComparator* comparator_;
std::string file_name_for_tracing;
};
} // namespace content
#endif // CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_DATABASE_H_
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