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/*
* Copyright (C) 2010 Google, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef ScriptRunner_h
#define ScriptRunner_h
#include "core/CoreExport.h"
#include "platform/heap/Handle.h"
#include "public/platform/WebTraceLocation.h"
#include "wtf/Deque.h"
#include "wtf/HashMap.h"
#include "wtf/Noncopyable.h"
namespace blink {
class Document;
class ScriptLoader;
class WebTaskRunner;
class CORE_EXPORT ScriptRunner final
: public GarbageCollectedFinalized<ScriptRunner> {
WTF_MAKE_NONCOPYABLE(ScriptRunner);
public:
static ScriptRunner* create(Document* document) {
return new ScriptRunner(document);
}
// Async scripts may either execute asynchronously (as their load
// completes), or 'in order'. See
// http://www.html5rocks.com/en/tutorials/speed/script-loading/ for more
// information.
enum AsyncExecutionType { None, Async, InOrder };
void queueScriptForExecution(ScriptLoader*, AsyncExecutionType);
bool hasPendingScripts() const {
return !m_pendingInOrderScripts.isEmpty() ||
!m_pendingAsyncScripts.isEmpty();
}
void suspend();
void resume();
void notifyScriptReady(ScriptLoader*, AsyncExecutionType);
void notifyScriptLoadError(ScriptLoader*, AsyncExecutionType);
static void movePendingScript(Document&, Document&, ScriptLoader*);
DECLARE_TRACE();
private:
class Task;
explicit ScriptRunner(Document*);
void movePendingScript(ScriptRunner*, ScriptLoader*);
bool removePendingInOrderScript(ScriptLoader*);
void scheduleReadyInOrderScripts();
void postTask(const WebTraceLocation&);
bool executeTaskFromQueue(HeapDeque<Member<ScriptLoader>>*);
void executeTask();
Member<Document> m_document;
HeapDeque<Member<ScriptLoader>> m_pendingInOrderScripts;
HeapHashSet<Member<ScriptLoader>> m_pendingAsyncScripts;
// http://www.whatwg.org/specs/web-apps/current-work/#set-of-scripts-that-will-execute-as-soon-as-possible
HeapDeque<Member<ScriptLoader>> m_asyncScriptsToExecuteSoon;
HeapDeque<Member<ScriptLoader>> m_inOrderScriptsToExecuteSoon;
RefPtr<WebTaskRunner> m_taskRunner;
int m_numberOfInOrderScriptsWithPendingNotification;
bool m_isSuspended;
#ifndef NDEBUG
bool m_hasEverBeenSuspended;
#endif
};
} // namespace blink
#endif // ScriptRunner_h
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