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// Copyright 2016 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_LEVELDB_DATABASE_IMPL_H_
#define COMPONENTS_LEVELDB_LEVELDB_DATABASE_IMPL_H_
#include "base/memory/scoped_ptr.h"
#include "components/leveldb/public/interfaces/leveldb.mojom.h"
#include "mojo/public/cpp/bindings/interface_request.h"
#include "mojo/public/cpp/bindings/strong_binding.h"
#include "third_party/leveldatabase/src/include/leveldb/db.h"
namespace leveldb {
class MojoEnv;
// The backing to a database object that we pass to our called.
class LevelDBDatabaseImpl : public LevelDBDatabase {
public:
LevelDBDatabaseImpl(leveldb::LevelDBDatabaseRequest request,
scoped_ptr<leveldb::Env> environment,
scoped_ptr<leveldb::DB> db);
~LevelDBDatabaseImpl() override;
// Overridden from LevelDBDatabase:
void Put(mojo::Array<uint8_t> key,
mojo::Array<uint8_t> value,
const PutCallback& callback) override;
void Delete(mojo::Array<uint8_t> key,
const DeleteCallback& callback) override;
void Write(mojo::Array<BatchedOperationPtr> operations,
const WriteCallback& callback) override;
void Get(mojo::Array<uint8_t> key, const GetCallback& callback) override;
void GetSnapshot(const GetSnapshotCallback& callback) override;
void ReleaseSnapshot(uint64_t snapshot_id) override;
void GetFromSnapshot(uint64_t snapshot_id,
mojo::Array<uint8_t> key,
const GetCallback& callback) override;
void NewIterator(const NewIteratorCallback& callback) override;
void NewIteratorFromSnapshot(uint64_t snapshot_id,
const NewIteratorCallback& callback) override;
void ReleaseIterator(uint64_t iterator_id) override;
void IteratorSeekToFirst(
uint64_t iterator_id,
const IteratorSeekToFirstCallback& callback) override;
void IteratorSeekToLast(uint64_t iterator_id,
const IteratorSeekToLastCallback& callback) override;
void IteratorSeek(uint64_t iterator_id,
mojo::Array<uint8_t> target,
const IteratorSeekToLastCallback& callback) override;
void IteratorNext(uint64_t iterator_id,
const IteratorNextCallback& callback) override;
void IteratorPrev(uint64_t iterator_id,
const IteratorPrevCallback& callback) override;
private:
// Returns the state of |it| to a caller. Note: This assumes that all the
// iterator movement methods have the same callback signature. We don't
// directly reference the underlying type in case of bindings change.
void ReplyToIteratorMessage(leveldb::Iterator* it,
const IteratorSeekToFirstCallback& callback);
mojo::StrongBinding<LevelDBDatabase> binding_;
scoped_ptr<leveldb::Env> environment_;
scoped_ptr<leveldb::DB> db_;
std::map<uint64_t, const Snapshot*> snapshot_map_;
// TODO(erg): If we have an existing iterator which depends on a snapshot,
// and delete the snapshot from the client side, that shouldn't delete the
// snapshot maybe? At worse it's a DDoS if there's multiple users of the
// system, but this maybe should be fixed...
std::map<uint64_t, Iterator*> iterator_map_;
DISALLOW_COPY_AND_ASSIGN(LevelDBDatabaseImpl);
};
} // namespace leveldb
#endif // COMPONENTS_LEVELDB_LEVELDB_DATABASE_IMPL_H_
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