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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 #include "config.h"
     27 #include "ResponsivenessTimer.h"
     28 
     29 #include "WorkItem.h"
     30 
     31 namespace WebKit {
     32 
     33 static const double kResponsivenessTimeout = 3;
     34 
     35 ResponsivenessTimer::ResponsivenessTimer(ResponsivenessTimer::Client* client)
     36     : m_client(client)
     37     , m_isResponsive(true)
     38     , m_timer(RunLoop::main(), this, &ResponsivenessTimer::timerFired)
     39 {
     40 }
     41 
     42 ResponsivenessTimer::~ResponsivenessTimer()
     43 {
     44     m_timer.stop();
     45 }
     46 
     47 void ResponsivenessTimer::invalidate()
     48 {
     49     m_timer.stop();
     50 }
     51 
     52 void ResponsivenessTimer::timerFired()
     53 {
     54     // We'll never schedule the timer unless we're responsive.
     55     ASSERT(m_isResponsive);
     56 
     57     m_isResponsive = false;
     58     m_client->didBecomeUnresponsive(this);
     59 
     60     m_timer.stop();
     61 }
     62 
     63 void ResponsivenessTimer::start()
     64 {
     65     if (m_timer.isActive())
     66         return;
     67 
     68     if (!m_isResponsive)
     69         return;
     70 
     71     m_timer.startOneShot(kResponsivenessTimeout);
     72 }
     73 
     74 void ResponsivenessTimer::stop()
     75 {
     76     if (!m_isResponsive) {
     77         // We got a life sign from the web process!
     78         m_client->didBecomeResponsive(this);
     79         m_isResponsive = true;
     80     }
     81 
     82     m_timer.stop();
     83 }
     84 
     85 } // namespace WebKit
     86