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// Copyright 2012 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_SYNC_SYNCABLE_BASE_TRANSACTION_H_
#define COMPONENTS_SYNC_SYNCABLE_BASE_TRANSACTION_H_
#include "base/macros.h"
#include "components/sync/base/cryptographer.h"
#include "components/sync/base/model_type.h"
#include "components/sync/syncable/user_share.h"
namespace syncer {
enum class PassphraseType;
namespace syncable {
class BaseTransaction;
class Directory;
}
// Sync API's BaseTransaction, ReadTransaction, and WriteTransaction allow for
// batching of several read and/or write operations. The read and write
// operations are performed by creating ReadNode and WriteNode instances using
// the transaction. These transaction classes wrap identically named classes in
// syncable, and are used in a similar way. Unlike syncable::BaseTransaction,
// whose construction requires an explicit syncable::Directory, a sync
// API BaseTransaction is created from a UserShare object.
//
// Note, these transactions are not atomic. Individual operations can
// fail. There is no built-in rollback or undo mechanism.
class BaseTransaction {
public:
// Provide access to the underlying syncable objects from BaseNode.
virtual syncable::BaseTransaction* GetWrappedTrans() const = 0;
Cryptographer* GetCryptographer() const;
ModelTypeSet GetEncryptedTypes() const;
PassphraseType GetPassphraseType() const;
syncable::Directory* GetDirectory() const {
if (!user_share_) {
return nullptr;
} else {
return user_share_->directory.get();
}
}
UserShare* GetUserShare() const { return user_share_; }
protected:
explicit BaseTransaction(UserShare* share);
virtual ~BaseTransaction();
BaseTransaction() : user_share_(nullptr) {}
private:
UserShare* user_share_;
DISALLOW_COPY_AND_ASSIGN(BaseTransaction);
};
} // namespace syncer
#endif // COMPONENTS_SYNC_SYNCABLE_BASE_TRANSACTION_H_
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