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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_CONTEXT_LIFECYCLE_OBSERVER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_CONTEXT_LIFECYCLE_OBSERVER_H_
#include "base/dcheck_is_on.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/heap/member.h"
namespace blink {
class ContextLifecycleNotifier;
// Observer that gets notified when the context lifecycle is changed (e.g.
// destroyed, moved into back/forward cache). Used to observe ExecutionContext
// from platform/.
class PLATFORM_EXPORT ContextLifecycleObserver : public GarbageCollectedMixin {
public:
virtual ~ContextLifecycleObserver();
void NotifyContextDestroyed();
ContextLifecycleNotifier* GetContextLifecycleNotifier() const {
return notifier_.Get();
}
void SetContextLifecycleNotifier(ContextLifecycleNotifier*);
virtual bool IsExecutionContextLifecycleObserver() const { return false; }
void Trace(Visitor*) const override;
protected:
ContextLifecycleObserver() = default;
virtual void ContextDestroyed() = 0;
private:
WeakMember<ContextLifecycleNotifier> notifier_;
#if DCHECK_IS_ON()
bool waiting_for_context_destroyed_ = false;
#endif
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_CONTEXT_LIFECYCLE_OBSERVER_H_
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