chromium/src/third_party/blink/renderer/platform/context_lifecycle_notifier.cc

// Copyright 2021 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.

#include "third_party/blink/renderer/platform/context_lifecycle_notifier.h"

#include "third_party/blink/renderer/platform/context_lifecycle_observer.h"

namespace blink {

ContextLifecycleNotifier::~ContextLifecycleNotifier() {
#if DCHECK_IS_ON()
  // `NotifyContextDestroyed()` must be called prior to destruction.
  DCHECK(did_notify_observers_);
#endif
}

void ContextLifecycleNotifier::AddContextLifecycleObserver(
    ContextLifecycleObserver* observer) {
  observers_.AddObserver(observer);
}

void ContextLifecycleNotifier::RemoveContextLifecycleObserver(
    ContextLifecycleObserver* observer) {
  DCHECK(observers_.HasObserver(observer));
  observers_.RemoveObserver(observer);
}

void ContextLifecycleNotifier::NotifyContextDestroyed() {
  observers_.ForEachObserver([](ContextLifecycleObserver* observer) {
    observer->NotifyContextDestroyed();
  });
  observers_.Clear();

#if DCHECK_IS_ON()
  did_notify_observers_ = true;
#endif
}

void ContextLifecycleNotifier::Trace(Visitor* visitor) const {
  visitor->Trace(observers_);
}

}  // namespace blink