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      1 /*
      2  * Copyright (C) 2010 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef ResponsivenessTimer_h
     27 #define ResponsivenessTimer_h
     28 
     29 #include "RunLoop.h"
     30 
     31 namespace WebKit {
     32 
     33 class ResponsivenessTimer {
     34 public:
     35     class Client {
     36     public:
     37         virtual ~Client() { }
     38         virtual void didBecomeUnresponsive(ResponsivenessTimer*) = 0;
     39         virtual void didBecomeResponsive(ResponsivenessTimer*) = 0;
     40     };
     41 
     42     ResponsivenessTimer(ResponsivenessTimer::Client*);
     43     ~ResponsivenessTimer();
     44 
     45     void start();
     46     void stop();
     47 
     48     void invalidate();
     49 
     50     bool isResponsive() { return m_isResponsive; }
     51 
     52 private:
     53     void timerFired();
     54 
     55     ResponsivenessTimer::Client* m_client;
     56     bool m_isResponsive;
     57 
     58     RunLoop::Timer<ResponsivenessTimer> m_timer;
     59 };
     60 
     61 } // namespace WebKit
     62 
     63 #endif // ResponsivenessTimer_h
     64 
     65