sync/internal_api/public/base/cancelation_observer.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef SYNC_INTERNAL_API_PUBLIC_BASE_CANCELATION_OBSERVER_H_
   6 #define SYNC_INTERNAL_API_PUBLIC_BASE_CANCELATION_OBSERVER_H_
   7
   8 #include "sync/base/sync_export.h"
   9
  10 namespace syncer {
  11
  12 // Interface for classes that handle signals from the CancelationSignal.
  13 class SYNC_EXPORT CancelationObserver {
  14  public:
  15   CancelationObserver();
  16   virtual ~CancelationObserver() = 0;
  17
  18   // This may be called from a foreign thread while the CancelationSignal's lock
  19   // is held.  The callee should avoid performing slow or blocking operations.
  20   virtual void OnSignalReceived() = 0;
  21 };
  22
  23 }  // namespace syncer
  24
  25 #endif  // SYNC_INTERNAL_API_PUBLIC_BASE_CANCELATION_OBSERVER_H_