[Sync] Move //sync to //components/sync.

sync/sessions/directory_type_debug_info_emitter.h

-// 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 SYNC_SESSIONS_DIRECTORY_TYPE_DEBUG_INFO_EMITTER_H_
-#define SYNC_SESSIONS_DIRECTORY_TYPE_DEBUG_INFO_EMITTER_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "base/observer_list.h"
-#include "base/values.h"
-#include "sync/base/sync_export.h"
-#include "sync/internal_api/public/sessions/commit_counters.h"
-#include "sync/internal_api/public/sessions/update_counters.h"
-#include "sync/syncable/directory.h"
-
-namespace syncer {
-
-class DirectoryCommitContributor;
-class TypeDebugInfoObserver;
-
-// Supports various kinds of debugging requests for a certain directory type.
-//
-// The GetAllNodes() function is used to help export a snapshot of all current
-// nodes to its caller.  The complexity required to manage the request mostly
-// lives elsewhere.
-//
-// The Emit*() functions send updates to registered TypeDebugInfoObservers.
-// The DirectoryTypeDebugInfoEmitter does not directly own that list; it is
-// managed by the ModelTypeRegistry.
-//
-// For Update and Commit counters, the job of keeping the counters up to date
-// is delegated to the UpdateHandler and CommitContributors.  For the Stats
-// counters, the emitter will use its type_ and directory_ members to fetch all
-// the required information on demand.
-class SYNC_EXPORT DirectoryTypeDebugInfoEmitter {
- public:
-  // Standard constructor for non-tests.
-  //
-  // The |directory| and |observers| arguments are not owned.  Both may be
-  // modified outside of this object and both are expected to outlive this
-  // object.
-  DirectoryTypeDebugInfoEmitter(
-      syncable::Directory* directory,
-      syncer::ModelType type,
-      base::ObserverList<TypeDebugInfoObserver>* observers);
-
-  // A simple constructor for tests.  Should not be used in real code.
-  DirectoryTypeDebugInfoEmitter(
-      ModelType type,
-      base::ObserverList<TypeDebugInfoObserver>* observers);
-
-  virtual ~DirectoryTypeDebugInfoEmitter();
-
-  // Returns a ListValue representation of all known nodes of this type.
-  std::unique_ptr<base::ListValue> GetAllNodes();
-
-  // Returns a reference to the current commit counters.
-  const CommitCounters& GetCommitCounters() const;
-
-  // Allows others to mutate the commit counters.
-  CommitCounters* GetMutableCommitCounters();
-
-  // Triggerss a commit counters update to registered observers.
-  void EmitCommitCountersUpdate();
-
-  // Returns a reference to the current update counters.
-  const UpdateCounters& GetUpdateCounters() const;
-
-  // Allows others to mutate the update counters.
-  UpdateCounters* GetMutableUpdateCounters();
-
-  // Triggers an update counters update to registered observers.
-  void EmitUpdateCountersUpdate();
-
-  // Triggers a status counters update to registered observers.
-  void EmitStatusCountersUpdate();
-
- private:
-  syncable::Directory* directory_;
-
-  const ModelType type_;
-
-  CommitCounters commit_counters_;
-  UpdateCounters update_counters_;
-
-  // Because there are so many emitters that come into and out of existence, it
-  // doesn't make sense to have them manage their own observer list.  They all
-  // share one observer list that is provided by their owner and which is
-  // guaranteed to outlive them.
-  base::ObserverList<TypeDebugInfoObserver>* type_debug_info_observers_;
-
-  DISALLOW_COPY_AND_ASSIGN(DirectoryTypeDebugInfoEmitter);
-};
-
-}  // namespace syncer
-
-#endif  // SYNC_SESSIONS_DIRECTORY_TYPE_DEBUG_INFO_EMITTER_H_