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// Copyright (c) 2009 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.
//
// An UpdateApplicator is used to iterate over a number of unapplied updates,
// applying them to the client using the given syncer session.
//
// UpdateApplicator might resemble an iterator, but it actually keeps retrying
// failed updates until no remaining updates can be successfully applied.
#ifndef CHROME_BROWSER_SYNC_ENGINE_UPDATE_APPLICATOR_H_
#define CHROME_BROWSER_SYNC_ENGINE_UPDATE_APPLICATOR_H_
#include <set>
#include <vector>
#include "base/basictypes.h"
#include "base/port.h"
namespace syncable {
class Id;
class WriteTransaction;
} // namespace syncable
namespace browser_sync {
class SyncerSession;
class UpdateApplicator {
public:
typedef std::vector<int64>::iterator vi64iter;
UpdateApplicator(SyncerSession* session, const vi64iter& begin,
const vi64iter& end);
// returns true if there's more we can do.
bool AttemptOneApplication(syncable::WriteTransaction* trans);
// return true if we've applied all updates.
bool AllUpdatesApplied() const;
// This class does not automatically save its progress into the
// SyncerSession -- to get that to happen, call this method after update
// application is finished (i.e., when AttemptOneAllocation stops returning
// true).
void SaveProgressIntoSessionState();
private:
SyncerSession* const session_;
vi64iter const begin_;
vi64iter end_;
vi64iter pointer_;
bool progress_;
// Track the result of the various items.
std::vector<syncable::Id> conflicting_ids_;
std::vector<syncable::Id> blocked_ids_;
std::vector<syncable::Id> successful_ids_;
};
} // namespace browser_sync
#endif // CHROME_BROWSER_SYNC_ENGINE_UPDATE_APPLICATOR_H_
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