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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 THIRD_PARTY_BLINK_RENDERER_CORE_SCRIPT_SCRIPT_RUNNER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_SCRIPT_SCRIPT_RUNNER_H_
#include "base/location.h"
#include "base/macros.h"
#include "base/single_thread_task_runner.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/bindings/name_client.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/deque.h"
#include "third_party/blink/renderer/platform/wtf/hash_map.h"
namespace blink {
class Document;
class PendingScript;
class ScriptLoader;
class CORE_EXPORT ScriptRunner final
: public GarbageCollectedFinalized<ScriptRunner>,
public NameClient {
public:
explicit ScriptRunner(Document*);
void QueueScriptForExecution(PendingScript*);
bool HasPendingScripts() const {
return !pending_in_order_scripts_.IsEmpty() ||
!pending_async_scripts_.IsEmpty();
}
void Suspend();
void Resume();
void NotifyScriptReady(PendingScript*);
static void MovePendingScript(Document&, Document&, ScriptLoader*);
void Trace(blink::Visitor*);
const char* NameInHeapSnapshot() const override { return "ScriptRunner"; }
private:
class Task;
void MovePendingScript(ScriptRunner*, PendingScript*);
bool RemovePendingInOrderScript(PendingScript*);
void ScheduleReadyInOrderScripts();
void PostTask(const base::Location&);
// Execute the first task in in_order_scripts_to_execute_soon_.
// Returns true if task was run, and false otherwise.
bool ExecuteInOrderTask();
// Execute any task in async_scripts_to_execute_soon_.
// Returns true if task was run, and false otherwise.
bool ExecuteAsyncTask();
void ExecuteTask();
Member<Document> document_;
HeapDeque<Member<PendingScript>> pending_in_order_scripts_;
HeapHashSet<Member<PendingScript>> pending_async_scripts_;
// http://www.whatwg.org/specs/web-apps/current-work/#set-of-scripts-that-will-execute-as-soon-as-possible
HeapDeque<Member<PendingScript>> async_scripts_to_execute_soon_;
HeapDeque<Member<PendingScript>> in_order_scripts_to_execute_soon_;
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
int number_of_in_order_scripts_with_pending_notification_ = 0;
bool is_suspended_ = false;
#ifndef NDEBUG
// We expect to have one posted task in flight for each script in either
// .._to_be_executed_soon_ queue. This invariant will be temporarily violated
// when the ScriptRunner is suspended. We'll use this variable to account &
// check this invariant for debugging.
int number_of_extra_tasks_ = 0;
#endif
DISALLOW_COPY_AND_ASSIGN(ScriptRunner);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_SCRIPT_SCRIPT_RUNNER_H_
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