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      1 /*
      2  * Copyright (C) 2010 Google, 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. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "ScriptRunner.h"
     28 
     29 #include "CachedScript.h"
     30 #include "Document.h"
     31 #include "Element.h"
     32 #include "PendingScript.h"
     33 #include "ScriptElement.h"
     34 
     35 namespace WebCore {
     36 
     37 ScriptRunner::ScriptRunner(Document* document)
     38     : m_document(document)
     39     , m_timer(this, &ScriptRunner::timerFired)
     40 {
     41     ASSERT(document);
     42 }
     43 
     44 ScriptRunner::~ScriptRunner()
     45 {
     46     for (size_t i = 0; i < m_scriptsToExecuteSoon.size(); ++i)
     47         m_document->decrementLoadEventDelayCount();
     48     for (size_t i = 0; i < m_scriptsToExecuteInOrder.size(); ++i)
     49         m_document->decrementLoadEventDelayCount();
     50 }
     51 
     52 void ScriptRunner::queueScriptForExecution(ScriptElement* scriptElement, CachedResourceHandle<CachedScript> cachedScript, ExecutionType executionType)
     53 {
     54     ASSERT(scriptElement);
     55 
     56     Element* element = scriptElement->element();
     57     ASSERT(element);
     58     ASSERT(element->inDocument());
     59 
     60     m_document->incrementLoadEventDelayCount();
     61 
     62     switch (executionType) {
     63     case ASYNC_EXECUTION:
     64         m_scriptsToExecuteSoon.append(PendingScript(element, cachedScript.get()));
     65         if (!m_timer.isActive())
     66             m_timer.startOneShot(0);
     67         break;
     68 
     69     case IN_ORDER_EXECUTION:
     70         m_scriptsToExecuteInOrder.append(PendingScript(element, cachedScript.get()));
     71         break;
     72 
     73     default:
     74         ASSERT_NOT_REACHED();
     75     }
     76 }
     77 
     78 void ScriptRunner::suspend()
     79 {
     80     m_timer.stop();
     81 }
     82 
     83 void ScriptRunner::resume()
     84 {
     85     if (hasPendingScripts())
     86         m_timer.startOneShot(0);
     87 }
     88 
     89 void ScriptRunner::notifyInOrderScriptReady()
     90 {
     91     ASSERT(!m_scriptsToExecuteInOrder.isEmpty());
     92     m_timer.startOneShot(0);
     93 }
     94 
     95 void ScriptRunner::timerFired(Timer<ScriptRunner>* timer)
     96 {
     97     ASSERT_UNUSED(timer, timer == &m_timer);
     98 
     99     RefPtr<Document> protect(m_document);
    100 
    101     Vector<PendingScript> scripts;
    102     scripts.swap(m_scriptsToExecuteSoon);
    103 
    104     size_t numInOrderScriptsToExecute = 0;
    105     for (; numInOrderScriptsToExecute < m_scriptsToExecuteInOrder.size() && m_scriptsToExecuteInOrder[numInOrderScriptsToExecute].cachedScript()->isLoaded(); ++numInOrderScriptsToExecute)
    106         scripts.append(m_scriptsToExecuteInOrder[numInOrderScriptsToExecute]);
    107     if (numInOrderScriptsToExecute)
    108         m_scriptsToExecuteInOrder.remove(0, numInOrderScriptsToExecute);
    109 
    110     size_t size = scripts.size();
    111     for (size_t i = 0; i < size; ++i) {
    112         CachedScript* cachedScript = scripts[i].cachedScript();
    113         RefPtr<Element> element = scripts[i].releaseElementAndClear();
    114         toScriptElement(element.get())->execute(cachedScript);
    115         m_document->decrementLoadEventDelayCount();
    116     }
    117 }
    118 
    119 }
    120