NS_IMETHODIMP
WebBrowserPersistResourcesChild::VisitDocument(nsIWebBrowserPersistDocument* aDocument,
nsIWebBrowserPersistDocument* aSubDocument)
{
auto* subActor = new WebBrowserPersistDocumentChild();
dom::PBrowserChild* grandManager = Manager()->Manager();
// As a consequence of how PWebBrowserPersistDocumentConstructor can be
// sent by both the parent and the child, we must pass the outerWindowID
// argument here. We pass 0, though note that this argument is actually
// just ignored when passed up to the parent from the child.
if (!grandManager->SendPWebBrowserPersistDocumentConstructor(subActor, 0)) {
// NOTE: subActor is freed at this point.
return NS_ERROR_FAILURE;
}
// ...but here, IPC won't free subActor until after this returns
// to the event loop.
// The order of these two messages will be preserved, because
// they're the same toplevel protocol and priority.
//
// With this ordering, it's always the transition out of START
// state that causes a document's parent actor to be exposed to
// XPCOM (for both parent->child and child->parent construction),
// which simplifies the lifetime management.
SendVisitDocument(subActor);
subActor->Start(aSubDocument);
return NS_OK;
}
NS_IMETHODIMP
WebBrowserPersistResourcesChild::VisitDocument(
nsIWebBrowserPersistDocument* aDocument,
nsIWebBrowserPersistDocument* aSubDocument) {
auto* subActor = new WebBrowserPersistDocumentChild();
// As a consequence of how PWebBrowserPersistDocumentConstructor
// can be sent by both the parent and the child, we must pass the
// aBrowser and outerWindowID arguments here, but the values are
// ignored by the parent. In particular, the TabChild in which
// persistence started does not necessarily exist at this point;
// see bug 1203602.
if (!Manager()->Manager()->SendPWebBrowserPersistDocumentConstructor(
subActor, nullptr, 0)) {
// NOTE: subActor is freed at this point.
return NS_ERROR_FAILURE;
}
// ...but here, IPC won't free subActor until after this returns
// to the event loop.
// The order of these two messages will be preserved, because
// they're the same toplevel protocol and priority.
//
// With this ordering, it's always the transition out of START
// state that causes a document's parent actor to be exposed to
// XPCOM (for both parent->child and child->parent construction),
// which simplifies the lifetime management.
SendVisitDocument(subActor);
subActor->Start(aSubDocument);
return NS_OK;
}