dom/localstorage/LSObserver.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=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 file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "LSObserver.h"
   8
   9 // Local includes
  10 #include "ActorsChild.h"
  11
  12 // Global includes
  13 #include <utility>
  14 #include "mozilla/StaticPtr.h"
  15 #include "nsTHashMap.h"
  16 #include "nsHashKeys.h"
  17
  18 namespace mozilla::dom {
  19
  20 namespace {
  21
  22 using LSObserverHashtable = nsTHashMap<nsCStringHashKey, LSObserver*>;
  23
  24 StaticAutoPtr<LSObserverHashtable> gLSObservers;
  25
  26 }  // namespace
  27
  28 LSObserver::LSObserver(const nsACString& aOrigin)
  29     : mActor(nullptr), mOrigin(aOrigin) {
  30   AssertIsOnOwningThread();
  31
  32   if (!gLSObservers) {
  33     gLSObservers = new LSObserverHashtable();
  34   }
  35
  36   MOZ_ASSERT(!gLSObservers->Contains(mOrigin));
  37   gLSObservers->InsertOrUpdate(mOrigin, this);
  38 }
  39
  40 LSObserver::~LSObserver() {
  41   AssertIsOnOwningThread();
  42
  43   if (mActor) {
  44     mActor->SendDeleteMeInternal();
  45     MOZ_ASSERT(!mActor, "SendDeleteMeInternal should have cleared!");
  46   }
  47
  48   MOZ_ASSERT(gLSObservers);
  49   MOZ_ASSERT(gLSObservers->Get(mOrigin));
  50   gLSObservers->Remove(mOrigin);
  51
  52   if (!gLSObservers->Count()) {
  53     gLSObservers = nullptr;
  54   }
  55 }
  56
  57 // static
  58 LSObserver* LSObserver::Get(const nsACString& aOrigin) {
  59   return gLSObservers ? gLSObservers->Get(aOrigin) : nullptr;
  60 }
  61
  62 void LSObserver::SetActor(LSObserverChild* aActor) {
  63   AssertIsOnOwningThread();
  64   MOZ_ASSERT(aActor);
  65   MOZ_ASSERT(!mActor);
  66
  67   mActor = aActor;
  68 }
  69
  70 }  // namespace mozilla::dom