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// Copyright (c) 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.
//
// 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 SYNC_ENGINE_UPDATE_APPLICATOR_H_
#define SYNC_ENGINE_UPDATE_APPLICATOR_H_
#include <vector>
#include "base/basictypes.h"
#include "base/port.h"
#include "sync/internal_api/public/engine/model_safe_worker.h"
#include "sync/syncable/syncable_id.h"
#include "sync/sessions/status_controller.h"
namespace syncer {
namespace sessions {
class StatusController;
class UpdateProgress;
}
namespace syncable {
class WriteTransaction;
class Entry;
}
class ConflictResolver;
class Cryptographer;
class UpdateApplicator {
public:
typedef std::vector<int64>::iterator UpdateIterator;
UpdateApplicator(Cryptographer* cryptographer,
const ModelSafeRoutingInfo& routes,
ModelSafeGroup group_filter);
~UpdateApplicator();
// Attempt to apply the specified updates.
void AttemptApplications(syncable::WriteTransaction* trans,
const std::vector<int64>& handles,
sessions::StatusController* status);
// 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(
std::set<syncable::Id>* simple_conflict_ids,
sessions::UpdateProgress* update_progress);
private:
// Track the status of all applications.
class ResultTracker {
public:
explicit ResultTracker();
virtual ~ResultTracker();
void AddSimpleConflict(syncable::Id);
void AddEncryptionConflict(syncable::Id);
void AddHierarchyConflict(syncable::Id);
void AddSuccess(syncable::Id);
void SaveProgress(std::set<syncable::Id>* simple_conflict_ids,
sessions::UpdateProgress* update_progress);
void ClearHierarchyConflicts();
// Returns true iff conflicting_ids_ is empty. Does not check
// encryption_conflict_ids_.
bool no_conflicts() const;
private:
std::set<syncable::Id> conflicting_ids_;
std::set<syncable::Id> successful_ids_;
std::set<syncable::Id> encryption_conflict_ids_;
std::set<syncable::Id> hierarchy_conflict_ids_;
};
// If true, AttemptOneApplication will skip over |entry| and return true.
bool SkipUpdate(const syncable::Entry& entry);
// Used to decrypt sensitive sync nodes.
Cryptographer* cryptographer_;
ModelSafeGroup group_filter_;
const ModelSafeRoutingInfo routing_info_;
// Track the result of the attempts to update applications.
ResultTracker application_results_;
DISALLOW_COPY_AND_ASSIGN(UpdateApplicator);
};
} // namespace syncer
#endif // SYNC_ENGINE_UPDATE_APPLICATOR_H_
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