Relieve SyncerSession,SyncCycleState, SyncProcessState, SyncerSession, Syncer...

chrome/browser/sync/engine/client_command_channel.h

-// Copyright (c) 2006-2009 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_CLIENT_COMMAND_CHANNEL_H_
-#define CHROME_BROWSER_SYNC_ENGINE_CLIENT_COMMAND_CHANNEL_H_
-
-#include "chrome/browser/sync/protocol/sync.pb.h"
-#include "chrome/browser/sync/util/event_sys.h"
-
-namespace browser_sync {
-
-// Commands for the client come back in sync responses, which is kind of
-// inconvenient because some services (like the bandwidth throttler) want to
-// know about them. So to avoid explicit dependencies on this protocol
-// behavior, the syncer dumps all client commands onto a shared client command
-// channel.
-
-struct ClientCommandChannelTraits {
-  typedef const sync_pb::ClientCommand* EventType;
-  static inline bool IsChannelShutdownEvent(const EventType &event) {
-    return 0 == event;
-  }
-};
-
-typedef EventChannel<ClientCommandChannelTraits, Lock>
-    ClientCommandChannel;
-
-}  // namespace browser_sync
-
-#endif  // CHROME_BROWSER_SYNC_ENGINE_CLIENT_COMMAND_CHANNEL_H_