dom/cache/CacheStorageChild.cpp

   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/Unused.h"
  10 #include "mozilla/dom/cache/CacheChild.h"
  11 #include "mozilla/dom/cache/CacheOpChild.h"
  12 #include "mozilla/dom/cache/CacheStorage.h"
  13 #include "mozilla/dom/cache/CacheWorkerRef.h"
  14
  15 namespace mozilla::dom::cache {
  16
  17 // declared in ActorUtils.h
  18 void DeallocPCacheStorageChild(PCacheStorageChild* aActor) { delete aActor; }
  19
  20 CacheStorageChild::CacheStorageChild(CacheStorage* aListener,
  21                                      SafeRefPtr<CacheWorkerRef> aWorkerRef)
  22     : 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::ExecuteOp(nsIGlobalObject* aGlobal, Promise* aPromise,
  42                                   nsISupports* aParent,
  43                                   const CacheOpArgs& aArgs) {
  44   Unused << SendPCacheOpConstructor(
  45       new CacheOpChild(GetWorkerRefPtr().clonePtr(), aGlobal, aParent, aPromise,
  46                        this),
  47       aArgs);
  48 }
  49
  50 void CacheStorageChild::StartDestroyFromListener() {
  51   NS_ASSERT_OWNINGTHREAD(CacheStorageChild);
  52
  53   StartDestroy();
  54 }
  55
  56 void CacheStorageChild::DestroyInternal() {
  57   RefPtr<CacheStorage> listener = mListener;
  58
  59   // StartDestroy() can get called from either CacheStorage or the
  60   // CacheWorkerRef.
  61   // Theoretically we can get double called if the right race happens.  Handle
  62   // that by just ignoring the second StartDestroy() call.
  63   if (!listener) {
  64     return;
  65   }
  66
  67   listener->DestroyInternal(this);
  68
  69   // CacheStorage listener should call ClearListener() in DestroyInternal()
  70   MOZ_DIAGNOSTIC_ASSERT(!mListener);
  71
  72   // Start actor destruction from parent process
  73   QM_WARNONLY_TRY(OkIf(SendTeardown()));
  74 }
  75
  76 void CacheStorageChild::StartDestroy() {
  77   NS_ASSERT_OWNINGTHREAD(CacheStorageChild);
  78
  79   if (NumChildActors() != 0) {
  80     mDelayedDestroy = true;
  81     return;
  82   }
  83   DestroyInternal();
  84 }
  85
  86 void CacheStorageChild::NoteDeletedActor() {
  87   // Check to see if DestroyInternal was delayed because of active CacheOpChilds
  88   // when StartDestroy was called from WorkerRef notification. If the last
  89   // CacheOpChild is getting destructed; it's the time for us to SendTearDown to
  90   // the other side.
  91   if (NumChildActors() == 0 && mDelayedDestroy) DestroyInternal();
  92 }
  93
  94 void CacheStorageChild::ActorDestroy(ActorDestroyReason aReason) {
  95   NS_ASSERT_OWNINGTHREAD(CacheStorageChild);
  96   RefPtr<CacheStorage> listener = mListener;
  97   if (listener) {
  98     listener->DestroyInternal(this);
  99     // CacheStorage listener should call ClearListener() in DestroyInternal()
 100     MOZ_DIAGNOSTIC_ASSERT(!mListener);
 101   }
 102
 103   RemoveWorkerRef();
 104 }
 105
 106 PCacheOpChild* CacheStorageChild::AllocPCacheOpChild(
 107     const CacheOpArgs& aOpArgs) {
 108   MOZ_CRASH("CacheOpChild should be manually constructed.");
 109   return nullptr;
 110 }
 111 }  // namespace mozilla::dom::cache