forked from mirrors/gecko-dev
136 lines
3.9 KiB
C++
136 lines
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/cache/CacheChild.h"
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#include "mozilla/Unused.h"
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#include "mozilla/dom/cache/ActorUtils.h"
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#include "mozilla/dom/cache/Cache.h"
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#include "mozilla/dom/cache/CacheOpChild.h"
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#include "CacheWorkerRef.h"
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namespace mozilla::dom::cache {
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// Declared in ActorUtils.h
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already_AddRefed<PCacheChild> AllocPCacheChild() {
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return MakeAndAddRef<CacheChild>();
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}
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// Declared in ActorUtils.h
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void DeallocPCacheChild(PCacheChild* aActor) { delete aActor; }
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CacheChild::CacheChild()
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: mListener(nullptr), mLocked(false), mDelayedDestroy(false) {
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MOZ_COUNT_CTOR(cache::CacheChild);
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}
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CacheChild::~CacheChild() {
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MOZ_COUNT_DTOR(cache::CacheChild);
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NS_ASSERT_OWNINGTHREAD(CacheChild);
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MOZ_DIAGNOSTIC_ASSERT(!mListener);
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MOZ_DIAGNOSTIC_ASSERT(!mLocked);
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}
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void CacheChild::SetListener(Cache* aListener) {
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NS_ASSERT_OWNINGTHREAD(CacheChild);
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MOZ_DIAGNOSTIC_ASSERT(!mListener);
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mListener = aListener;
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MOZ_DIAGNOSTIC_ASSERT(mListener);
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}
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void CacheChild::ClearListener() {
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NS_ASSERT_OWNINGTHREAD(CacheChild);
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MOZ_DIAGNOSTIC_ASSERT(mListener);
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mListener = nullptr;
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}
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void CacheChild::ExecuteOp(nsIGlobalObject* aGlobal, Promise* aPromise,
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nsISupports* aParent, const CacheOpArgs& aArgs) {
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MOZ_ALWAYS_TRUE(SendPCacheOpConstructor(
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new CacheOpChild(GetWorkerRefPtr().clonePtr(), aGlobal, aParent, aPromise,
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this),
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aArgs));
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}
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void CacheChild::StartDestroyFromListener() {
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NS_ASSERT_OWNINGTHREAD(CacheChild);
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// The listener should be held alive by any async operations, so if it
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// is going away then there must not be any child actors. This in turn
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// ensures that StartDestroy() will not trigger the delayed path.
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MOZ_DIAGNOSTIC_ASSERT(NumChildActors() == 0);
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StartDestroy();
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}
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void CacheChild::DestroyInternal() {
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RefPtr<Cache> listener = mListener;
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// StartDestroy() can get called from either Cache or the WorkerRef.
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// Theoretically we can get double called if the right race happens. Handle
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// that by just ignoring the second StartDestroy() call.
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if (!listener) {
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return;
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}
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listener->DestroyInternal(this);
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// Cache listener should call ClearListener() in DestroyInternal()
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MOZ_DIAGNOSTIC_ASSERT(!mListener);
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// Start actor destruction from parent process
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QM_WARNONLY_TRY(OkIf(SendTeardown()));
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}
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void CacheChild::StartDestroy() {
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NS_ASSERT_OWNINGTHREAD(CacheChild);
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if (NumChildActors() != 0 || mLocked) {
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mDelayedDestroy = true;
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return;
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}
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DestroyInternal();
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}
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void CacheChild::ActorDestroy(ActorDestroyReason aReason) {
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NS_ASSERT_OWNINGTHREAD(CacheChild);
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RefPtr<Cache> listener = mListener;
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if (listener) {
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listener->DestroyInternal(this);
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// Cache listener should call ClearListener() in DestroyInternal()
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MOZ_DIAGNOSTIC_ASSERT(!mListener);
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}
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RemoveWorkerRef();
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}
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void CacheChild::NoteDeletedActor() {
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// Check to see if DestroyInternal was delayed because there were still active
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// CacheOpChilds when StartDestroy was called from WorkerRef notification. If
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// the last CacheOpChild is getting destructed; it's the time for us to
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// SendTearDown to the other side.
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if (NumChildActors() == 1 && mDelayedDestroy && !mLocked) DestroyInternal();
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}
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already_AddRefed<PCacheOpChild> CacheChild::AllocPCacheOpChild(
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const CacheOpArgs& aOpArgs) {
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MOZ_CRASH("CacheOpChild should be manually constructed.");
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return nullptr;
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}
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void CacheChild::Lock() {
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NS_ASSERT_OWNINGTHREAD(CacheChild);
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MOZ_DIAGNOSTIC_ASSERT(!mLocked);
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mLocked = true;
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}
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void CacheChild::Unlock() {
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NS_ASSERT_OWNINGTHREAD(CacheChild);
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MOZ_DIAGNOSTIC_ASSERT(mLocked);
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mLocked = false;
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}
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} // namespace mozilla::dom::cache
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