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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 SYNC_SYNCABLE_SYNCABLE_WRITE_TRANSACTION_H_
#define SYNC_SYNCABLE_SYNCABLE_WRITE_TRANSACTION_H_
#include "sync/base/sync_export.h"
#include "sync/syncable/entry_kernel.h"
#include "sync/syncable/syncable_base_transaction.h"
namespace syncer {
namespace syncable {
SYNC_EXPORT extern const int64 kInvalidTransactionVersion;
// Locks db in constructor, unlocks in destructor.
class SYNC_EXPORT WriteTransaction : public BaseTransaction {
public:
WriteTransaction(const tracked_objects::Location& from_here,
WriterTag writer, Directory* directory);
// Constructor used for getting back transaction version after making sync
// API changes to one model. If model is changed by the transaction,
// the new transaction version of the model and modified nodes will be saved
// in |transaction_version| upon destruction of the transaction. If model is
// not changed, |transaction_version| will be kInvalidTransactionVersion.
WriteTransaction(const tracked_objects::Location& from_here,
Directory* directory, int64* transaction_version);
virtual ~WriteTransaction();
void SaveOriginal(const EntryKernel* entry);
protected:
// Overridden by tests.
virtual void NotifyTransactionComplete(ModelTypeSet models_with_changes);
private:
friend class MutableEntry;
// Clears |mutations_|.
ImmutableEntryKernelMutationMap RecordMutations();
void UnlockAndNotify(const ImmutableEntryKernelMutationMap& mutations);
ModelTypeSet NotifyTransactionChangingAndEnding(
const ImmutableEntryKernelMutationMap& mutations);
// Increment versions of the models whose entries are modified and set the
// version on the changed entries.
void UpdateTransactionVersion(const std::vector<int64>& entry_changed);
// Only the original fields are filled in until |RecordMutations()|.
// We use a mutation map instead of a kernel set to avoid copying.
EntryKernelMutationMap mutations_;
// Stores new transaction version of changed model and nodes if model is
// indeed changed. kInvalidTransactionVersion otherwise. Not owned.
int64* transaction_version_;
DISALLOW_COPY_AND_ASSIGN(WriteTransaction);
};
} // namespace syncable
} // namespace syncer
#endif // SYNC_SYNCABLE_SYNCABLE_WRITE_TRANSACTION_H_