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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/cache/CacheWorkerRef.h"
#include "mozilla/dom/cache/ActorChild.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/dom/WorkerRef.h"
namespace mozilla::dom::cache {
namespace {
// XXX Move this to mfbt, or do we already have something like this? Or remove
// the need for that by changing StrongWorkerRef/IPCWorkerRef?
template <class T>
class FakeCopyable {
public:
explicit FakeCopyable(T&& aTarget) : mTarget(std::forward<T>(aTarget)) {}
FakeCopyable(FakeCopyable&&) = default;
FakeCopyable(const FakeCopyable& aOther)
: mTarget(std::move(const_cast<FakeCopyable&>(aOther).mTarget)) {
MOZ_CRASH("Do not copy.");
}
template <typename... Args>
auto operator()(Args&&... aArgs) {
return mTarget(std::forward<Args>(aArgs)...);
}
private:
T mTarget;
};
} // namespace
// static
SafeRefPtr<CacheWorkerRef> CacheWorkerRef::Create(WorkerPrivate* aWorkerPrivate,
Behavior aBehavior) {
MOZ_DIAGNOSTIC_ASSERT(aWorkerPrivate);
// XXX This looks as if this could be simplified now by moving into the ctor
// of CacheWorkerRef, since we can now use SafeRefPtrFromThis in the ctor
auto workerRef =
MakeSafeRefPtr<CacheWorkerRef>(aBehavior, ConstructorGuard{});
auto notify =
FakeCopyable([workerRef = workerRef.clonePtr()] { workerRef->Notify(); });
if (aBehavior == eStrongWorkerRef) {
workerRef->mStrongWorkerRef = StrongWorkerRef::Create(
aWorkerPrivate, "CacheWorkerRef-Strong", std::move(notify));
} else {
MOZ_ASSERT(aBehavior == eIPCWorkerRef);
workerRef->mIPCWorkerRef = IPCWorkerRef::Create(
aWorkerPrivate, "CacheWorkerRef-IPC", std::move(notify));
}
if (NS_WARN_IF(!workerRef->mIPCWorkerRef && !workerRef->mStrongWorkerRef)) {
return nullptr;
}
return workerRef;
}
// static
SafeRefPtr<CacheWorkerRef> CacheWorkerRef::PreferBehavior(
SafeRefPtr<CacheWorkerRef> aCurrentRef, Behavior aBehavior) {
if (!aCurrentRef) {
return nullptr;
}
SafeRefPtr<CacheWorkerRef> orig = std::move(aCurrentRef);
if (orig->mBehavior == aBehavior) {
return orig;
}
WorkerPrivate* workerPrivate = nullptr;
if (orig->mBehavior == eStrongWorkerRef) {
workerPrivate = orig->mStrongWorkerRef->Private();
} else {
MOZ_ASSERT(orig->mBehavior == eIPCWorkerRef);
workerPrivate = orig->mIPCWorkerRef->Private();
}
MOZ_ASSERT(workerPrivate);
SafeRefPtr<CacheWorkerRef> replace = Create(workerPrivate, aBehavior);
return static_cast<bool>(replace) ? std::move(replace) : std::move(orig);
}
void CacheWorkerRef::AddActor(ActorChild& aActor) {
NS_ASSERT_OWNINGTHREAD(CacheWorkerRef);
MOZ_ASSERT(!mActorList.Contains(&aActor));
mActorList.AppendElement(WrapNotNullUnchecked(&aActor));
// Allow an actor to be added after we've entered the Notifying case. We
// can't stop the actor creation from racing with out destruction of the
// other actors and we need to wait for this extra one to close as well.
// Signal it should destroy itself right away.
if (mNotified) {
aActor.StartDestroy();
}
}
void CacheWorkerRef::RemoveActor(ActorChild& aActor) {
NS_ASSERT_OWNINGTHREAD(CacheWorkerRef);
#if defined(RELEASE_OR_BETA)
mActorList.RemoveElement(&aActor);
#else
MOZ_DIAGNOSTIC_ASSERT(mActorList.RemoveElement(&aActor));
#endif
MOZ_ASSERT(!mActorList.Contains(&aActor));
if (mActorList.IsEmpty()) {
mStrongWorkerRef = nullptr;
mIPCWorkerRef = nullptr;
}
}
bool CacheWorkerRef::Notified() const { return mNotified; }
void CacheWorkerRef::Notify() {
NS_ASSERT_OWNINGTHREAD(CacheWorkerRef);
mNotified = true;
// Start the asynchronous destruction of our actors. These will call back
// into RemoveActor() once the actor is destroyed.
for (const auto& actor : mActorList) {
actor->StartDestroy();
}
}
CacheWorkerRef::CacheWorkerRef(Behavior aBehavior, ConstructorGuard)
: mBehavior(aBehavior), mNotified(false) {}
CacheWorkerRef::~CacheWorkerRef() {
NS_ASSERT_OWNINGTHREAD(CacheWorkerRef);
MOZ_DIAGNOSTIC_ASSERT(mActorList.IsEmpty());
}
} // namespace mozilla::dom::cache
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