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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 "core/dom/ScriptRunner.h"
     28 
     29 #include "core/dom/Document.h"
     30 #include "core/dom/Element.h"
     31 #include "core/dom/PendingScript.h"
     32 #include "core/dom/ScriptLoader.h"
     33 #include "core/fetch/ScriptResource.h"
     34 #include "platform/heap/Handle.h"
     35 
     36 namespace blink {
     37 
     38 ScriptRunner::ScriptRunner(Document* document)
     39     : m_document(document)
     40     , m_timer(this, &ScriptRunner::timerFired)
     41 {
     42     ASSERT(document);
     43 }
     44 
     45 ScriptRunner::~ScriptRunner()
     46 {
     47 }
     48 
     49 void ScriptRunner::addPendingAsyncScript(ScriptLoader* scriptLoader, const PendingScript& pendingScript)
     50 {
     51     m_document->incrementLoadEventDelayCount();
     52     m_pendingAsyncScripts.add(scriptLoader, pendingScript);
     53 }
     54 
     55 void ScriptRunner::queueScriptForExecution(ScriptLoader* scriptLoader, ResourcePtr<ScriptResource> resource, ExecutionType executionType)
     56 {
     57     ASSERT(scriptLoader);
     58     ASSERT(resource.get());
     59 
     60     Element* element = scriptLoader->element();
     61     ASSERT(element);
     62     ASSERT(element->inDocument());
     63 
     64     switch (executionType) {
     65     case ASYNC_EXECUTION:
     66         addPendingAsyncScript(scriptLoader, PendingScript(element, resource.get()));
     67         break;
     68 
     69     case IN_ORDER_EXECUTION:
     70         m_document->incrementLoadEventDelayCount();
     71         m_scriptsToExecuteInOrder.append(PendingScript(element, resource.get()));
     72         break;
     73     }
     74 }
     75 
     76 void ScriptRunner::suspend()
     77 {
     78     m_timer.stop();
     79 }
     80 
     81 void ScriptRunner::resume()
     82 {
     83     if (hasPendingScripts())
     84         m_timer.startOneShot(0, FROM_HERE);
     85 }
     86 
     87 void ScriptRunner::notifyScriptReady(ScriptLoader* scriptLoader, ExecutionType executionType)
     88 {
     89     switch (executionType) {
     90     case ASYNC_EXECUTION:
     91         ASSERT(m_pendingAsyncScripts.contains(scriptLoader));
     92         m_scriptsToExecuteSoon.append(m_pendingAsyncScripts.take(scriptLoader));
     93         break;
     94 
     95     case IN_ORDER_EXECUTION:
     96         ASSERT(!m_scriptsToExecuteInOrder.isEmpty());
     97         break;
     98     }
     99     m_timer.startOneShot(0, FROM_HERE);
    100 }
    101 
    102 void ScriptRunner::notifyScriptLoadError(ScriptLoader* scriptLoader, ExecutionType executionType)
    103 {
    104     switch (executionType) {
    105     case ASYNC_EXECUTION:
    106         ASSERT(m_pendingAsyncScripts.contains(scriptLoader));
    107         m_pendingAsyncScripts.remove(scriptLoader);
    108         m_document->decrementLoadEventDelayCount();
    109         break;
    110 
    111     case IN_ORDER_EXECUTION:
    112         ASSERT(!m_scriptsToExecuteInOrder.isEmpty());
    113         break;
    114     }
    115 }
    116 
    117 void ScriptRunner::movePendingAsyncScript(ScriptRunner* newRunner, ScriptLoader* scriptLoader)
    118 {
    119     if (m_pendingAsyncScripts.contains(scriptLoader)) {
    120         newRunner->addPendingAsyncScript(scriptLoader, m_pendingAsyncScripts.take(scriptLoader));
    121         m_document->decrementLoadEventDelayCount();
    122     }
    123 }
    124 
    125 void ScriptRunner::timerFired(Timer<ScriptRunner>* timer)
    126 {
    127     ASSERT_UNUSED(timer, timer == &m_timer);
    128 
    129     RefPtrWillBeRawPtr<Document> protect(m_document.get());
    130 
    131     Vector<PendingScript> scripts;
    132     scripts.swap(m_scriptsToExecuteSoon);
    133 
    134     size_t numInOrderScriptsToExecute = 0;
    135     for (; numInOrderScriptsToExecute < m_scriptsToExecuteInOrder.size() && m_scriptsToExecuteInOrder[numInOrderScriptsToExecute].resource()->isLoaded(); ++numInOrderScriptsToExecute)
    136         scripts.append(m_scriptsToExecuteInOrder[numInOrderScriptsToExecute]);
    137     if (numInOrderScriptsToExecute)
    138         m_scriptsToExecuteInOrder.remove(0, numInOrderScriptsToExecute);
    139 
    140     size_t size = scripts.size();
    141     for (size_t i = 0; i < size; ++i) {
    142         ScriptResource* resource = scripts[i].resource();
    143         RefPtrWillBeRawPtr<Element> element = scripts[i].releaseElementAndClear();
    144         toScriptLoaderIfPossible(element.get())->execute(resource);
    145         m_document->decrementLoadEventDelayCount();
    146     }
    147 }
    148 
    149 void ScriptRunner::trace(Visitor* visitor)
    150 {
    151 #if ENABLE(OILPAN)
    152     visitor->trace(m_document);
    153     visitor->trace(m_scriptsToExecuteInOrder);
    154     visitor->trace(m_scriptsToExecuteSoon);
    155     visitor->trace(m_pendingAsyncScripts);
    156 #endif
    157 }
    158 
    159 }
    160