// Copyright 2021 The Chromium Authors
// 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/bindings/script_forbidden_scope.h"
#include "third_party/blink/renderer/platform/context_lifecycle_observer.h"

namespace blink {

ContextLifecycleNotifier::~ContextLifecycleNotifier() {
  // `NotifyContextDestroyed()` must be called prior to destruction.
  DCHECK(context_destroyed_);
}

bool ContextLifecycleNotifier::IsContextDestroyed() const {
  return context_destroyed_;
}

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

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

void ContextLifecycleNotifier::NotifyContextDestroyed() {
  context_destroyed_ = true;

  ScriptForbiddenScope forbid_script;
  observers_.ForEachObserver([](ContextLifecycleObserver* observer) {
    observer->NotifyContextDestroyed();
  });
  observers_.Clear();
}

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

}  // namespace blink