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// Copyright (c) 2011 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 CHROME_BROWSER_SYNC_GLUE_GENERIC_CHANGE_PROCESSOR_H_
#define CHROME_BROWSER_SYNC_GLUE_GENERIC_CHANGE_PROCESSOR_H_
#pragma once
#include <vector>
#include "base/compiler_specific.h"
#include "chrome/browser/sync/api/sync_change_processor.h"
#include "chrome/browser/sync/glue/change_processor.h"
class SyncData;
class SyncableService;
typedef std::vector<SyncData> SyncDataList;
namespace browser_sync {
// TODO(sync): deprecate all change processors and have them replaced by
// instances of this.
// Datatype agnostic change processor. One instance of GenericChangeProcessor
// is created for each datatype and lives on the datatype's thread. It then
// handles all interaction with the sync api, both translating pushes from the
// local service into transactions and receiving changes from the sync model,
// which then get converted into SyncChange's and sent to the local service.
class GenericChangeProcessor : public ChangeProcessor,
public SyncChangeProcessor {
public:
GenericChangeProcessor(SyncableService* local_service,
UnrecoverableErrorHandler* error_handler,
sync_api::UserShare* user_share);
virtual ~GenericChangeProcessor();
// ChangeProcessor interface.
// Build and store a list of all changes into |syncer_changes_|.
virtual void ApplyChangesFromSyncModel(
const sync_api::BaseTransaction* trans,
const sync_api::SyncManager::ChangeRecord* changes,
int change_count) OVERRIDE;
// Passes |syncer_changes_|, built in ApplyChangesFromSyncModel, onto
// |local_service_| by way of it's ProcessSyncChanges method.
virtual void CommitChangesFromSyncModel() OVERRIDE;
// SyncChangeProcessor implementation.
virtual SyncError ProcessSyncChanges(
const tracked_objects::Location& from_here,
const SyncChangeList& change_list) OVERRIDE;
// Fills |current_sync_data| with all the syncer data for the specified type.
virtual SyncError GetSyncDataForType(syncable::ModelType type,
SyncDataList* current_sync_data);
// Generic versions of AssociatorInterface methods. Called by
// SyncableServiceAdapter.
bool SyncModelHasUserCreatedNodes(syncable::ModelType type,
bool* has_nodes);
bool CryptoReadyIfNecessary(syncable::ModelType type);
protected:
// ChangeProcessor interface.
virtual void StartImpl(Profile* profile) OVERRIDE; // Not implemented.
virtual void StopImpl() OVERRIDE; // Not implemented.
virtual sync_api::UserShare* share_handle() OVERRIDE;
private:
// The SyncableService this change processor will forward changes on to.
SyncableService* local_service_;
// The current list of changes received from the syncer. We buffer because
// we must ensure no syncapi transaction is held when we pass it on to
// |local_service_|.
// Set in ApplyChangesFromSyncModel, consumed in CommitChangesFromSyncModel.
SyncChangeList syncer_changes_;
// Our handle to the sync model. Unlike normal ChangeProcessors, we need to
// be able to access the sync model before the change processor begins
// listening to changes (the local_service_ will be interacting with us
// when it starts up). As such we can't wait until Start(_) has been called,
// and have to keep a local pointer to the user_share.
sync_api::UserShare* user_share_;
};
} // namespace browser_sync
#endif // CHROME_BROWSER_SYNC_GLUE_GENERIC_CHANGE_PROCESSOR_H_
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