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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_
#pragma once
#include <set>
#include <vector>
#include "base/basictypes.h"
#include "base/port.h"
#include "chrome/browser/sync/engine/model_safe_worker.h"
#include "chrome/browser/sync/syncable/syncable.h"
namespace browser_sync {
namespace sessions {
class ConflictProgress;
class UpdateProgress;
}
class ConflictResolver;
class Cryptographer;
class UpdateApplicator {
public:
typedef syncable::Directory::UnappliedUpdateMetaHandles::iterator
UpdateIterator;
UpdateApplicator(ConflictResolver* resolver,
Cryptographer* cryptographer,
const UpdateIterator& begin,
const UpdateIterator& end,
const ModelSafeRoutingInfo& routes,
ModelSafeGroup group_filter);
// 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
// SyncSession -- to get that to happen, call this method after update
// application is finished (i.e., when AttemptOneAllocation stops returning
// true).
void SaveProgressIntoSessionState(
sessions::ConflictProgress* conflict_progress,
sessions::UpdateProgress* update_progress);
private:
// If true, AttemptOneApplication will skip over |entry| and return true.
bool SkipUpdate(const syncable::Entry& entry);
// Adjusts the UpdateIterator members to move ahead by one update.
void Advance();
// Used to resolve conflicts when trying to apply updates.
ConflictResolver* const resolver_;
// Used to decrypt sensitive sync nodes.
Cryptographer* cryptographer_;
UpdateIterator const begin_;
UpdateIterator end_;
UpdateIterator pointer_;
ModelSafeGroup group_filter_;
bool progress_;
const ModelSafeRoutingInfo routing_info_;
// Track the result of the various items.
std::vector<syncable::Id> conflicting_ids_;
std::vector<syncable::Id> successful_ids_;
};
} // namespace browser_sync
#endif // CHROME_BROWSER_SYNC_ENGINE_UPDATE_APPLICATOR_H_
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