tor-browser

The Tor Browser
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CacheStorageChild.cpp (3352B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "mozilla/dom/cache/CacheStorageChild.h"
      8 
      9 #include "mozilla/dom/cache/CacheChild.h"
     10 #include "mozilla/dom/cache/CacheOpChild.h"
     11 #include "mozilla/dom/cache/CacheStorage.h"
     12 #include "mozilla/dom/cache/CacheWorkerRef.h"
     13 
     14 namespace mozilla::dom::cache {
     15 
     16 // declared in ActorUtils.h
     17 void DeallocPCacheStorageChild(PCacheStorageChild* aActor) { delete aActor; }
     18 
     19 CacheStorageChild::CacheStorageChild(CacheStorageChildListener* aListener,
     20                                     SafeRefPtr<CacheWorkerRef> aWorkerRef,
     21                                     ActorChild* aParentActor)
     22    : mParentActor(aParentActor), mListener(aListener), mDelayedDestroy(false) {
     23  MOZ_COUNT_CTOR(cache::CacheStorageChild);
     24  MOZ_DIAGNOSTIC_ASSERT(mListener);
     25 
     26  SetWorkerRef(std::move(aWorkerRef));
     27 }
     28 
     29 CacheStorageChild::~CacheStorageChild() {
     30  MOZ_COUNT_DTOR(cache::CacheStorageChild);
     31  NS_ASSERT_OWNINGTHREAD(CacheStorageChild);
     32  MOZ_DIAGNOSTIC_ASSERT(!mListener);
     33 }
     34 
     35 void CacheStorageChild::ClearListener() {
     36  NS_ASSERT_OWNINGTHREAD(CacheStorageChild);
     37  MOZ_DIAGNOSTIC_ASSERT(mListener);
     38  mListener = nullptr;
     39 }
     40 
     41 void CacheStorageChild::StartDestroyFromListener() {
     42  NS_ASSERT_OWNINGTHREAD(CacheStorageChild);
     43 
     44  StartDestroy();
     45 }
     46 
     47 void CacheStorageChild::DestroyInternal() {
     48  CacheStorageChildListener* listener = mListener;
     49 
     50  // StartDestroy() can get called from either CacheStorage or the
     51  // CacheWorkerRef.
     52  // Theoretically we can get double called if the right race happens.  Handle
     53  // that by just ignoring the second StartDestroy() call.
     54  if (!listener) {
     55    return;
     56  }
     57 
     58  listener->OnActorDestroy(this);
     59 
     60  // CacheStorage listener should call ClearListener() in OnActorDestroy()
     61  MOZ_DIAGNOSTIC_ASSERT(!mListener);
     62 
     63  // Start actor destruction from parent process
     64  QM_WARNONLY_TRY(OkIf(SendTeardown()));
     65 }
     66 
     67 void CacheStorageChild::StartDestroy() {
     68  NS_ASSERT_OWNINGTHREAD(CacheStorageChild);
     69 
     70  if (NumChildActors() != 0) {
     71    mDelayedDestroy = true;
     72    return;
     73  }
     74  DestroyInternal();
     75 }
     76 
     77 void CacheStorageChild::NoteDeletedActor() {
     78  // Check to see if DestroyInternal was delayed because of active CacheOpChilds
     79  // when StartDestroy was called from WorkerRef notification. If the last
     80  // CacheOpChild is getting destructed; it's the time for us to SendTearDown to
     81  // the other side.
     82  if (NumChildActors() == 0 && mDelayedDestroy) {
     83    DestroyInternal();
     84  }
     85 }
     86 
     87 void CacheStorageChild::ActorDestroy(ActorDestroyReason aReason) {
     88  NS_ASSERT_OWNINGTHREAD(CacheStorageChild);
     89  CacheStorageChildListener* listener = mListener;
     90  if (listener) {
     91    listener->OnActorDestroy(this);
     92    // CacheStorage listener should call ClearListener() in OnActorDestroy()
     93    MOZ_DIAGNOSTIC_ASSERT(!mListener);
     94  }
     95 
     96  if (mParentActor) {
     97    mParentActor->NoteDeletedActor();
     98  }
     99 
    100  RemoveWorkerRef();
    101 }
    102 
    103 PCacheOpChild* CacheStorageChild::AllocPCacheOpChild(
    104    const CacheOpArgs& aOpArgs) {
    105  MOZ_CRASH("CacheOpChild should be manually constructed.");
    106  return nullptr;
    107 }
    108 }  // namespace mozilla::dom::cache