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 10namespace syncer { 11 12// Interface for classes that handle signals from the CancelationSignal. 13class 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_ 26