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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/WorkerTestUtils.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/Monitor.h"
#include "mozilla/RefPtr.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/dom/WorkerRef.h"
#include "mozilla/dom/WorkerTestUtilsBinding.h"
#include "nsIObserverService.h"
#include "nsThreadUtils.h"
namespace mozilla::dom {
uint32_t WorkerTestUtils::CurrentTimerNestingLevel(const GlobalObject& aGlobal,
ErrorResult& aErr) {
MOZ_ASSERT(!NS_IsMainThread());
WorkerPrivate* worker = GetCurrentThreadWorkerPrivate();
MOZ_ASSERT(worker);
return worker->GetCurrentTimerNestingLevel();
}
bool WorkerTestUtils::IsRunningInBackground(const GlobalObject&,
ErrorResult& aErr) {
MOZ_ASSERT(!NS_IsMainThread());
WorkerPrivate* worker = GetCurrentThreadWorkerPrivate();
MOZ_ASSERT(worker);
return worker->IsRunningInBackground();
}
namespace {
// Helper for HoldStrongWorkerRefUntilMainThreadObserverNotified that optionally
// holds a ThreadSafeWorkerRef until the given observer notification is notified
// and also notifies a monitor.
class WorkerTestUtilsObserver final : public nsIObserver {
public:
WorkerTestUtilsObserver(const nsACString& aTopic,
RefPtr<ThreadSafeWorkerRef>&& aWorkerRef)
: mMonitor("WorkerTestUtils"),
mTopic(aTopic),
mWorkerRef(std::move(aWorkerRef)),
mRegistered(false),
mObserved(false) {}
NS_DECL_THREADSAFE_ISUPPORTS
NS_IMETHOD Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) override {
// We only register for one topic so we don't actually need to compare it.
nsCOMPtr<nsIObserverService> observerService =
services::GetObserverService();
MOZ_ALWAYS_SUCCEEDS(observerService->RemoveObserver(this, mTopic.get()));
// The ThreadSafeWorkerRef is responsible for / knows how to drop the
// underlying StrongWorkerRef on the worker.
mWorkerRef = nullptr;
MonitorAutoLock lock(mMonitor);
mObserved = true;
mMonitor.Notify();
return NS_OK;
}
void Register() {
nsCOMPtr<nsIObserverService> observerService =
services::GetObserverService();
MOZ_ALWAYS_SUCCEEDS(
observerService->AddObserver(this, mTopic.get(), false));
MonitorAutoLock lock(mMonitor);
mRegistered = true;
mMonitor.Notify();
}
void WaitOnRegister() {
MonitorAutoLock lock(mMonitor);
while (!mRegistered) {
mMonitor.Wait();
}
}
void WaitOnObserver() {
MonitorAutoLock lock(mMonitor);
while (!mObserved) {
mMonitor.Wait();
}
}
private:
~WorkerTestUtilsObserver() = default;
Monitor mMonitor;
nsAutoCString mTopic;
RefPtr<ThreadSafeWorkerRef> mWorkerRef;
bool mRegistered;
bool mObserved;
};
NS_IMPL_ISUPPORTS(WorkerTestUtilsObserver, nsIObserver)
} // anonymous namespace
void WorkerTestUtils::HoldStrongWorkerRefUntilMainThreadObserverNotified(
const GlobalObject&, const nsACString& aTopic, ErrorResult& aErr) {
MOZ_ASSERT(!NS_IsMainThread());
WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
MOZ_ASSERT(workerPrivate);
RefPtr<StrongWorkerRef> strongWorkerRef =
StrongWorkerRef::Create(workerPrivate, "WorkerTestUtils");
if (NS_WARN_IF(!strongWorkerRef)) {
aErr.Throw(NS_ERROR_FAILURE);
return;
}
RefPtr<ThreadSafeWorkerRef> tsWorkerRef =
new ThreadSafeWorkerRef(strongWorkerRef);
auto observer =
MakeRefPtr<WorkerTestUtilsObserver>(aTopic, std::move(tsWorkerRef));
aErr = NS_DispatchToMainThread(NewRunnableMethod(
"WorkerTestUtils::HoldStrongWorkerRefUntilMainThreadObserverNotified",
observer, &WorkerTestUtilsObserver::Register));
// Wait for the observer to be registered before returning control so that we
// can be certain we won't miss an observer notification.
observer->WaitOnRegister();
}
void WorkerTestUtils::BlockUntilMainThreadObserverNotified(
const GlobalObject&, const nsACString& aTopic,
WorkerTestCallback& aWhenObserving, ErrorResult& aErr) {
MOZ_ASSERT(!NS_IsMainThread());
auto observer = MakeRefPtr<WorkerTestUtilsObserver>(aTopic, nullptr);
aErr = NS_DispatchToMainThread(
NewRunnableMethod("WorkerTestUtils::BlockUntilMainThreadObserverNotified",
observer, &WorkerTestUtilsObserver::Register));
if (aErr.Failed()) {
return;
}
observer->WaitOnRegister();
aWhenObserving.Call(aErr);
if (aErr.Failed()) {
return;
}
observer->WaitOnObserver();
}
void WorkerTestUtils::NotifyObserverOnMainThread(const GlobalObject&,
const nsACString& aTopic,
ErrorResult& aErr) {
MOZ_ASSERT(!NS_IsMainThread());
aErr = NS_DispatchToMainThread(NS_NewRunnableFunction(
"WorkerTestUtils::NotifyObserverOnMainThread",
[topic = nsCString(aTopic)] {
nsCOMPtr<nsIObserverService> observerService =
services::GetObserverService();
observerService->NotifyObservers(nullptr, topic.get(), nullptr);
}));
}
} // namespace mozilla::dom
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