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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_DIRECTORY_CHANGE_DELEGATE_H_
#define COMPONENTS_SYNC_SYNCABLE_DIRECTORY_CHANGE_DELEGATE_H_
#include <stdint.h>
#include <vector>
#include "components/sync/base/model_type.h"
#include "components/sync/syncable/write_transaction_info.h"
namespace syncer {
namespace syncable {
// This is an interface for listening to directory change events, triggered by
// the releasing of the syncable transaction. The delegate performs work to
// 1. Calculate changes, depending on the source of the transaction
// (HandleCalculateChangesChangeEventFromSyncer/Syncapi).
// 2. Perform final work while the transaction is held
// (HandleTransactionEndingChangeEvent).
// 3. Perform any work that should be done after the transaction is released.
// (HandleTransactionCompleteChangeEvent).
//
// Note that these methods may be called on *any* thread.
class DirectoryChangeDelegate {
public:
// Returns the handles of changed entries in |entry_changed|.
virtual void HandleCalculateChangesChangeEventFromSyncApi(
const ImmutableWriteTransactionInfo& write_transaction_info,
BaseTransaction* trans,
std::vector<int64_t>* entries_changed) = 0;
// Returns the handles of changed entries in |entry_changed|.
virtual void HandleCalculateChangesChangeEventFromSyncer(
const ImmutableWriteTransactionInfo& write_transaction_info,
BaseTransaction* trans,
std::vector<int64_t>* entries_changed) = 0;
// Must return the set of all ModelTypes that were modified in the
// transaction.
virtual ModelTypeSet HandleTransactionEndingChangeEvent(
const ImmutableWriteTransactionInfo& write_transaction_info,
BaseTransaction* trans) = 0;
virtual void HandleTransactionCompleteChangeEvent(
ModelTypeSet models_with_changes) = 0;
protected:
virtual ~DirectoryChangeDelegate() {}
};
} // namespace syncable
} // namespace syncer
#endif // COMPONENTS_SYNC_SYNCABLE_DIRECTORY_CHANGE_DELEGATE_H_
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