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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/CacheStorageChild.h"
#include "mozilla/Unused.h"
#include "mozilla/dom/cache/CacheChild.h"
#include "mozilla/dom/cache/CacheOpChild.h"
#include "mozilla/dom/cache/CacheStorage.h"
#include "mozilla/dom/cache/CacheWorkerRef.h"
namespace mozilla::dom::cache {
// declared in ActorUtils.h
void DeallocPCacheStorageChild(PCacheStorageChild* aActor) { delete aActor; }
CacheStorageChild::CacheStorageChild(CacheStorage* aListener,
SafeRefPtr<CacheWorkerRef> aWorkerRef)
: mListener(aListener), mNumChildActors(0), mDelayedDestroy(false) {
MOZ_COUNT_CTOR(cache::CacheStorageChild);
MOZ_DIAGNOSTIC_ASSERT(mListener);
SetWorkerRef(std::move(aWorkerRef));
}
CacheStorageChild::~CacheStorageChild() {
MOZ_COUNT_DTOR(cache::CacheStorageChild);
NS_ASSERT_OWNINGTHREAD(CacheStorageChild);
MOZ_DIAGNOSTIC_ASSERT(!mListener);
}
void CacheStorageChild::ClearListener() {
NS_ASSERT_OWNINGTHREAD(CacheStorageChild);
MOZ_DIAGNOSTIC_ASSERT(mListener);
mListener = nullptr;
}
void CacheStorageChild::ExecuteOp(nsIGlobalObject* aGlobal, Promise* aPromise,
nsISupports* aParent,
const CacheOpArgs& aArgs) {
mNumChildActors += 1;
Unused << SendPCacheOpConstructor(
new CacheOpChild(GetWorkerRefPtr().clonePtr(), aGlobal, aParent,
aPromise),
aArgs);
}
void CacheStorageChild::StartDestroyFromListener() {
NS_ASSERT_OWNINGTHREAD(CacheStorageChild);
// The listener should be held alive by any async operations, so if it
// is going away then there must not be any child actors. This in turn
// ensures that StartDestroy() will not trigger the delayed path.
MOZ_DIAGNOSTIC_ASSERT(!mNumChildActors);
StartDestroy();
}
void CacheStorageChild::StartDestroy() {
NS_ASSERT_OWNINGTHREAD(CacheStorageChild);
// If we have outstanding child actors, then don't destroy ourself yet.
// The child actors should be short lived and we should allow them to complete
// if possible. NoteDeletedActor() will call back into this Shutdown()
// method when the last child actor is gone.
if (mNumChildActors) {
mDelayedDestroy = true;
return;
}
RefPtr<CacheStorage> listener = mListener;
// StartDestroy() can get called from either CacheStorage or the
// CacheWorkerRef.
// Theoretically we can get double called if the right race happens. Handle
// that by just ignoring the second StartDestroy() call.
if (!listener) {
return;
}
listener->DestroyInternal(this);
// CacheStorage listener should call ClearListener() in DestroyInternal()
MOZ_DIAGNOSTIC_ASSERT(!mListener);
// Start actor destruction from parent process
QM_WARNONLY_TRY(OkIf(SendTeardown()));
}
void CacheStorageChild::ActorDestroy(ActorDestroyReason aReason) {
NS_ASSERT_OWNINGTHREAD(CacheStorageChild);
RefPtr<CacheStorage> listener = mListener;
if (listener) {
listener->DestroyInternal(this);
// CacheStorage listener should call ClearListener() in DestroyInternal()
MOZ_DIAGNOSTIC_ASSERT(!mListener);
}
RemoveWorkerRef();
}
PCacheOpChild* CacheStorageChild::AllocPCacheOpChild(
const CacheOpArgs& aOpArgs) {
MOZ_CRASH("CacheOpChild should be manually constructed.");
return nullptr;
}
bool CacheStorageChild::DeallocPCacheOpChild(PCacheOpChild* aActor) {
delete aActor;
NoteDeletedActor();
return true;
}
void CacheStorageChild::NoteDeletedActor() {
MOZ_DIAGNOSTIC_ASSERT(mNumChildActors);
mNumChildActors -= 1;
if (!mNumChildActors && mDelayedDestroy) {
StartDestroy();
}
}
} // namespace mozilla::dom::cache