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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 #ifndef ScriptRunner_h
     27 #define ScriptRunner_h
     28 
     29 #include "CachedResourceHandle.h"
     30 #include "Timer.h"
     31 #include <wtf/Noncopyable.h>
     32 #include <wtf/PassRefPtr.h>
     33 #include <wtf/Vector.h>
     34 
     35 namespace WebCore {
     36 
     37 class CachedScript;
     38 class Document;
     39 class PendingScript;
     40 class ScriptElement;
     41 
     42 class ScriptRunner {
     43     WTF_MAKE_NONCOPYABLE(ScriptRunner); WTF_MAKE_FAST_ALLOCATED;
     44 public:
     45     static PassOwnPtr<ScriptRunner> create(Document* document) { return new ScriptRunner(document); }
     46     ~ScriptRunner();
     47 
     48     enum ExecutionType { ASYNC_EXECUTION, IN_ORDER_EXECUTION };
     49     void queueScriptForExecution(ScriptElement*, CachedResourceHandle<CachedScript>, ExecutionType);
     50     bool hasPendingScripts() const { return !m_scriptsToExecuteSoon.isEmpty() || !m_scriptsToExecuteInOrder.isEmpty(); }
     51     void suspend();
     52     void resume();
     53     void notifyInOrderScriptReady();
     54 
     55 private:
     56     ScriptRunner(Document*);
     57 
     58     void timerFired(Timer<ScriptRunner>*);
     59 
     60     Document* m_document;
     61     Vector<PendingScript> m_scriptsToExecuteInOrder;
     62     Vector<PendingScript> m_scriptsToExecuteSoon; // http://www.whatwg.org/specs/web-apps/current-work/#set-of-scripts-that-will-execute-as-soon-as-possible
     63     Timer<ScriptRunner> m_timer;
     64 };
     65 
     66 }
     67 
     68 #endif
     69