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// Copyright 2014 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_ENGINE_IMPL_DIRECTORY_UPDATE_HANDLER_H_
#define COMPONENTS_SYNC_ENGINE_IMPL_DIRECTORY_UPDATE_HANDLER_H_
#include <map>
#include <memory>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "components/sync/base/model_type.h"
#include "components/sync/base/syncer_error.h"
#include "components/sync/engine_impl/process_updates_util.h"
#include "components/sync/engine_impl/update_handler.h"
namespace sync_pb {
class DataTypeProgressMarker;
class GarbageCollectionDirective;
}
namespace syncer {
class DataTypeDebugInfoEmitter;
class ModelSafeWorker;
class StatusController;
namespace syncable {
class Directory;
}
// This class represents the syncable::Directory's processes for requesting and
// processing updates from the sync server.
//
// Each instance of this class represents a particular type in the
// syncable::Directory. It can store and retreive that type's progress markers.
// It can also process a set of received SyncEntities and store their data.
class DirectoryUpdateHandler : public UpdateHandler {
public:
DirectoryUpdateHandler(syncable::Directory* dir,
ModelType type,
scoped_refptr<ModelSafeWorker> worker,
DataTypeDebugInfoEmitter* debug_info_emitter);
~DirectoryUpdateHandler() override;
// UpdateHandler implementation.
bool IsInitialSyncEnded() const override;
void GetDownloadProgress(
sync_pb::DataTypeProgressMarker* progress_marker) const override;
void GetDataTypeContext(sync_pb::DataTypeContext* context) const override;
SyncerError ProcessGetUpdatesResponse(
const sync_pb::DataTypeProgressMarker& progress_marker,
const sync_pb::DataTypeContext& mutated_context,
const SyncEntityList& applicable_updates,
StatusController* status) override;
void ApplyUpdates(StatusController* status) override;
void PassiveApplyUpdates(StatusController* status) override;
private:
friend class DirectoryUpdateHandlerApplyUpdateTest;
friend class DirectoryUpdateHandlerProcessUpdateTest;
// Sometimes there is nothing to do, so we can return without doing anything.
bool IsApplyUpdatesRequired();
// Called at the end of ApplyUpdates and PassiveApplyUpdates and performs
// steps common to both (even when IsApplyUpdatesRequired has returned
// false).
void PostApplyUpdates();
// Processes the given SyncEntities and stores their data in the directory.
// Their types must match this update handler's type.
void UpdateSyncEntities(syncable::ModelNeutralWriteTransaction* trans,
const SyncEntityList& applicable_updates,
StatusController* status);
// Expires entries according to GC directives.
void ExpireEntriesIfNeeded(
syncable::ModelNeutralWriteTransaction* trans,
const sync_pb::DataTypeProgressMarker& progress_marker);
// Stores the given progress marker in the directory.
// Its type must match this update handler's type.
void UpdateProgressMarker(
const sync_pb::DataTypeProgressMarker& progress_marker);
bool IsValidProgressMarker(
const sync_pb::DataTypeProgressMarker& progress_marker) const;
// Skips all checks and goes straight to applying the updates.
SyncerError ApplyUpdatesImpl(StatusController* status);
// Creates root node for the handled model type.
void CreateTypeRoot(syncable::ModelNeutralWriteTransaction* trans);
syncable::Directory* dir_;
ModelType type_;
scoped_refptr<ModelSafeWorker> worker_;
DataTypeDebugInfoEmitter* debug_info_emitter_;
std::unique_ptr<sync_pb::GarbageCollectionDirective> cached_gc_directive_;
DISALLOW_COPY_AND_ASSIGN(DirectoryUpdateHandler);
};
} // namespace syncer
#endif // COMPONENTS_SYNC_ENGINE_IMPL_DIRECTORY_UPDATE_HANDLER_H_
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