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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ParentFrameTaskRunners_h
#define ParentFrameTaskRunners_h
#include "core/CoreExport.h"
#include "core/dom/ContextLifecycleObserver.h"
#include "core/dom/TaskRunnerHelper.h"
#include "platform/heap/Handle.h"
#include "wtf/Allocator.h"
#include "wtf/Noncopyable.h"
#include "wtf/PtrUtil.h"
#include <memory>
namespace blink {
class LocalFrame;
class WebTaskRunner;
// Represents a set of task runners of the parent (or associated) document's
// frame. This could be accessed from worker thread(s) and must be initialized
// on the parent context thread (i.e. MainThread) on construction time, rather
// than being done lazily.
//
// This observes LocalFrame lifecycle only for in-process worker cases (i.e.
// only when a non-null LocalFrame is given).
class CORE_EXPORT ParentFrameTaskRunners final
: public GarbageCollectedFinalized<ParentFrameTaskRunners>,
public ContextLifecycleObserver {
USING_GARBAGE_COLLECTED_MIXIN(ParentFrameTaskRunners);
WTF_MAKE_NONCOPYABLE(ParentFrameTaskRunners);
public:
static ParentFrameTaskRunners* create(LocalFrame* frame) {
return new ParentFrameTaskRunners(frame);
}
// Might return nullptr for unsupported task types.
RefPtr<WebTaskRunner> get(TaskType);
DECLARE_VIRTUAL_TRACE();
private:
using TaskRunnerHashMap = HashMap<TaskType,
RefPtr<WebTaskRunner>,
WTF::IntHash<TaskType>,
TaskTypeTraits>;
// LocalFrame could be nullptr if the worker is not associated with a
// particular local frame.
explicit ParentFrameTaskRunners(LocalFrame*);
void contextDestroyed(ExecutionContext*) override;
Mutex m_taskRunnersMutex;
TaskRunnerHashMap m_taskRunners;
};
} // namespace blink
#endif // ParentFrameTaskRunners_h
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