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Bug 1659163 - Factor out the "create a promise that resolves when a background task finishes" from AsyncPromiseAttributeGetter. r=nordzilla

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Differential Revision: https://phabricator.services.mozilla.com/D87106
This commit is contained in:
Emilio Cobos Álvarez 2020-08-14 18:03:05 +00:00
parent 072b4d9e85
commit 1084508706
1 changed files with 24 additions and 10 deletions
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34
widget/PrintBackgroundTask.h
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@ -60,6 +60,26 @@ void SpawnPrintBackgroundTask(
}));
}
// Gets a fresh promise into aResultPromise, that resolves whenever the print
// background task finishes.
template <typename T, typename Result, typename... Args>
nsresult PrintBackgroundTaskPromise(
T& aReceiver, JSContext* aCx, dom::Promise** aResultPromise,
PrintBackgroundTask<T, Result, Args...> aTask, Args... aArgs) {
ErrorResult rv;
RefPtr<dom::Promise> promise =
dom::Promise::Create(xpc::CurrentNativeGlobal(aCx), rv);
if (MOZ_UNLIKELY(rv.Failed())) {
return rv.StealNSResult();
}
SpawnPrintBackgroundTask(aReceiver, *promise, aTask,
std::forward<Args>(aArgs)...);
promise.forget(aResultPromise);
return NS_OK;
}
// Resolves an async attribute via a background task, creating and storing a
// promise as needed in aPromiseSlot.
template <typename T, typename Result, typename... Args>
@ -72,17 +92,11 @@ nsresult AsyncPromiseAttributeGetter(
return NS_OK;
}
ErrorResult rv;
aPromiseSlot = dom::Promise::Create(xpc::CurrentNativeGlobal(aCx), rv);
if (MOZ_UNLIKELY(rv.Failed())) {
return rv.StealNSResult();
}
nsresult rv = PrintBackgroundTaskPromise(aReceiver, aCx, aResultPromise,
aTask, std::forward<Args>(aArgs)...);
NS_ENSURE_SUCCESS(rv, rv);
RefPtr<dom::Promise> promise = aPromiseSlot;
SpawnPrintBackgroundTask(aReceiver, *promise, aTask,
std::forward<Args>(aArgs)...);
promise.forget(aResultPromise);
aPromiseSlot = *aResultPromise;
return NS_OK;
}