import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/cache/CacheStorageChild.cpp

@@ -0,0 +1,148 @@
+/* -*- 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"
+
+namespace mozilla {
+namespace dom {
+namespace cache {
+
+// declared in ActorUtils.h
+void
+DeallocPCacheStorageChild(PCacheStorageChild* aActor)
+{
+  delete aActor;
+}
+
+CacheStorageChild::CacheStorageChild(CacheStorage* aListener,
+                                     CacheWorkerHolder* aWorkerHolder)
+  : mListener(aListener)
+  , mNumChildActors(0)
+  , mDelayedDestroy(false)
+{
+  MOZ_COUNT_CTOR(cache::CacheStorageChild);
+  MOZ_DIAGNOSTIC_ASSERT(mListener);
+
+  SetWorkerHolder(aWorkerHolder);
+}
+
+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(GetWorkerHolder(), 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
+  // CacheWorkerHolder.
+  // 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
+  Unused << 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);
+  }
+
+  RemoveWorkerHolder();
+}
+
+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 cache
+} // namespace dom
+} // namespace mozilla