[Sync] Move 'sync' target to sync/

chrome/browser/sync/engine/model_safe_worker.h

-// 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.
-
-#ifndef CHROME_BROWSER_SYNC_ENGINE_MODEL_SAFE_WORKER_H_
-#define CHROME_BROWSER_SYNC_ENGINE_MODEL_SAFE_WORKER_H_
-#pragma once
-
-#include <map>
-#include <string>
-#include <vector>
-
-#include "base/callback.h"
-#include "base/memory/ref_counted.h"
-#include "chrome/browser/sync/internal_api/includes/syncer_error.h"
-#include "chrome/browser/sync/syncable/model_type.h"
-
-namespace base {
-class DictionaryValue;
-}  // namespace
-
-namespace browser_sync {
-
-typedef base::Callback<enum SyncerError(void)> WorkCallback;
-
-enum ModelSafeGroup {
-  GROUP_PASSIVE = 0,   // Models that are just "passively" being synced; e.g.
-                       // changes to these models don't need to be pushed to a
-                       // native model.
-  GROUP_UI,            // Models that live on UI thread and are being synced.
-  GROUP_DB,            // Models that live on DB thread and are being synced.
-  GROUP_FILE,          // Models that live on FILE thread and are being synced.
-  GROUP_HISTORY,       // Models that live on history thread and are being
-                       // synced.
-  GROUP_PASSWORD,      // Models that live on the password thread and are
-                       // being synced.  On windows and linux, this runs on the
-                       // DB thread.
-  MODEL_SAFE_GROUP_COUNT,
-};
-
-std::string ModelSafeGroupToString(ModelSafeGroup group);
-
-// The Syncer uses a ModelSafeWorker for all tasks that could potentially
-// modify syncable entries (e.g under a WriteTransaction). The ModelSafeWorker
-// only knows how to do one thing, and that is take some work (in a fully
-// pre-bound callback) and have it performed (as in Run()) from a thread which
-// is guaranteed to be "model-safe", where "safe" refers to not allowing us to
-// cause an embedding application model to fall out of sync with the
-// syncable::Directory due to a race.
-class ModelSafeWorker : public base::RefCountedThreadSafe<ModelSafeWorker> {
- public:
-  // Any time the Syncer performs model modifications (e.g employing a
-  // WriteTransaction), it should be done by this method to ensure it is done
-  // from a model-safe thread.
-  virtual SyncerError DoWorkAndWaitUntilDone(const WorkCallback& work) = 0;
-
-  virtual ModelSafeGroup GetModelSafeGroup() = 0;
-
- protected:
-  virtual ~ModelSafeWorker();
-
- private:
-  friend class base::RefCountedThreadSafe<ModelSafeWorker>;
-};
-
-// A map that details which ModelSafeGroup each syncable::ModelType
-// belongs to.  Routing info can change in response to the user enabling /
-// disabling sync for certain types, as well as model association completions.
-typedef std::map<syncable::ModelType, ModelSafeGroup>
-    ModelSafeRoutingInfo;
-
-// Caller takes ownership of return value.
-base::DictionaryValue* ModelSafeRoutingInfoToValue(
-    const ModelSafeRoutingInfo& routing_info);
-
-std::string ModelSafeRoutingInfoToString(
-    const ModelSafeRoutingInfo& routing_info);
-
-syncable::ModelTypeSet GetRoutingInfoTypes(
-    const ModelSafeRoutingInfo& routing_info);
-
-ModelSafeGroup GetGroupForModelType(const syncable::ModelType type,
-                                    const ModelSafeRoutingInfo& routes);
-
-// Maintain the up-to-date state regarding which ModelSafeWorkers exist and
-// which types get routed to which worker.  When a sync session begins, it will
-// snapshot the state at that instant, and will use that for the entire
-// session.  This means if a model becomes synced (or unsynced) by the user
-// during a sync session, that session will complete and be unaware of this
-// change -- it will only get picked up for the next session.
-// TODO(tim): That's really the only way I can make sense of it in the Syncer
-// HOWEVER, it is awkward for running ModelAssociation. We need to make sure
-// we don't run such a thing until an active session wraps up.
-class ModelSafeWorkerRegistrar {
- public:
-  ModelSafeWorkerRegistrar() { }
-  // Get the current list of active ModelSafeWorkers.  Should be threadsafe.
-  virtual void GetWorkers(std::vector<ModelSafeWorker*>* out) = 0;
-
-  // Get the current routing information for all enabled model types.
-  // If a model type is not enabled (that is, if the syncer should not
-  // be trying to sync it), it is not in this map.
-  virtual void GetModelSafeRoutingInfo(ModelSafeRoutingInfo* out) = 0;
- protected:
-  virtual ~ModelSafeWorkerRegistrar() {}
- private:
-  DISALLOW_COPY_AND_ASSIGN(ModelSafeWorkerRegistrar);
-};
-
-}  // namespace browser_sync
-
-#endif  // CHROME_BROWSER_SYNC_ENGINE_MODEL_SAFE_WORKER_H_