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691628a34e
When we send out a prefetch request, we act as if the load came from one of the possibly many documents containing <link> element for the given URL. The docgroup assigned to this request is derived from this document. Later, when the load finishes, the OnStopRequest code runs in a runnable labeled with this docgroup. OnStopRequest dispatches a load event to *all* the link elements, including some that might be in different docgroups from the OnStopRequest runnable. This generates an assertion. To fix this, I decided to dispatch the load events asynchronously. I'm hoping the extra round trip through the event loop shouldn't hurt us too much since I doubt anyone actually listens for these events. MozReview-Commit-ID: FTkjuHO7RFp
114 lines
3.3 KiB
C++
114 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_AsyncEventDispatcher_h_
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#define mozilla_AsyncEventDispatcher_h_
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#include "mozilla/Attributes.h"
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#include "nsCOMPtr.h"
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#include "nsIDocument.h"
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#include "nsIDOMEvent.h"
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#include "nsString.h"
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#include "nsThreadUtils.h"
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class nsINode;
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namespace mozilla {
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/**
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* Use AsyncEventDispatcher to fire a DOM event that requires safe a stable DOM.
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* For example, you may need to fire an event from within layout, but
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* want to ensure that the event handler doesn't mutate the DOM at
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* the wrong time, in order to avoid resulting instability.
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*/
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class AsyncEventDispatcher : public CancelableRunnable
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{
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public:
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/**
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* If aOnlyChromeDispatch is true, the event is dispatched to only
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* chrome node. In that case, if aTarget is already a chrome node,
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* the event is dispatched to it, otherwise the dispatch path starts
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* at the first chrome ancestor of that target.
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*/
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AsyncEventDispatcher(nsINode* aTarget, const nsAString& aEventType,
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bool aBubbles, bool aOnlyChromeDispatch)
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: mTarget(aTarget)
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, mEventType(aEventType)
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, mBubbles(aBubbles)
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, mOnlyChromeDispatch(aOnlyChromeDispatch)
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{
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}
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AsyncEventDispatcher(dom::EventTarget* aTarget, const nsAString& aEventType,
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bool aBubbles)
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: mTarget(aTarget)
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, mEventType(aEventType)
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, mBubbles(aBubbles)
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{
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}
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AsyncEventDispatcher(dom::EventTarget* aTarget, nsIDOMEvent* aEvent)
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: mTarget(aTarget)
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, mEvent(aEvent)
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{
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}
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AsyncEventDispatcher(dom::EventTarget* aTarget, WidgetEvent& aEvent);
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NS_IMETHOD Run() override;
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nsresult Cancel() override;
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nsresult PostDOMEvent();
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void RunDOMEventWhenSafe();
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// Calling this causes the Run() method to check that
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// mTarget->IsInComposedDoc(). mTarget must be an nsINode or else we'll
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// assert.
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void RequireNodeInDocument();
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nsCOMPtr<dom::EventTarget> mTarget;
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nsCOMPtr<nsIDOMEvent> mEvent;
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nsString mEventType;
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bool mBubbles = false;
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bool mOnlyChromeDispatch = false;
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bool mCanceled = false;
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bool mCheckStillInDoc = false;
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};
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class LoadBlockingAsyncEventDispatcher final : public AsyncEventDispatcher
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{
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public:
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LoadBlockingAsyncEventDispatcher(nsINode* aEventNode,
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const nsAString& aEventType,
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bool aBubbles, bool aDispatchChromeOnly)
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: AsyncEventDispatcher(aEventNode, aEventType,
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aBubbles, aDispatchChromeOnly)
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, mBlockedDoc(aEventNode->OwnerDoc())
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{
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if (mBlockedDoc) {
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mBlockedDoc->BlockOnload();
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}
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}
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LoadBlockingAsyncEventDispatcher(nsINode* aEventNode, nsIDOMEvent* aEvent)
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: AsyncEventDispatcher(aEventNode, aEvent)
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, mBlockedDoc(aEventNode->OwnerDoc())
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{
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if (mBlockedDoc) {
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mBlockedDoc->BlockOnload();
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}
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}
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~LoadBlockingAsyncEventDispatcher();
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private:
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nsCOMPtr<nsIDocument> mBlockedDoc;
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};
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} // namespace mozilla
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#endif // mozilla_AsyncEventDispatcher_h_
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