mirror of
https://github.com/classilla/tenfourfox.git
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212 lines
4.7 KiB
C++
212 lines
4.7 KiB
C++
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/* -*- 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 "mozilla/dom/cache/CachePushStreamChild.h"
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namespace mozilla {
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namespace dom {
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namespace cache {
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// Declared in ActorUtils.h
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PCacheChild*
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AllocPCacheChild()
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{
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return new CacheChild();
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}
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// Declared in ActorUtils.h
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void
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DeallocPCacheChild(PCacheChild* aActor)
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{
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delete aActor;
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}
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CacheChild::CacheChild()
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: mListener(nullptr)
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, mNumChildActors(0)
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, mDelayedDestroy(false)
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, mLocked(false)
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{
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MOZ_COUNT_CTOR(cache::CacheChild);
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}
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CacheChild::~CacheChild()
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{
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MOZ_COUNT_DTOR(cache::CacheChild);
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NS_ASSERT_OWNINGTHREAD(CacheChild);
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MOZ_ASSERT(!mListener);
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MOZ_ASSERT(!mNumChildActors);
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MOZ_ASSERT(!mLocked);
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}
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void
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CacheChild::SetListener(Cache* aListener)
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{
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NS_ASSERT_OWNINGTHREAD(CacheChild);
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MOZ_ASSERT(!mListener);
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mListener = aListener;
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MOZ_ASSERT(mListener);
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}
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void
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CacheChild::ClearListener()
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{
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NS_ASSERT_OWNINGTHREAD(CacheChild);
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MOZ_ASSERT(mListener);
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mListener = nullptr;
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}
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void
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CacheChild::ExecuteOp(nsIGlobalObject* aGlobal, Promise* aPromise,
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nsISupports* aParent, const CacheOpArgs& aArgs)
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{
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mNumChildActors += 1;
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MOZ_ALWAYS_TRUE(SendPCacheOpConstructor(
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new CacheOpChild(GetFeature(), aGlobal, aParent, aPromise), aArgs));
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}
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CachePushStreamChild*
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CacheChild::CreatePushStream(nsISupports* aParent, nsIAsyncInputStream* aStream)
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{
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mNumChildActors += 1;
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auto actor = SendPCachePushStreamConstructor(
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new CachePushStreamChild(GetFeature(), aParent, aStream));
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MOZ_ASSERT(actor);
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return static_cast<CachePushStreamChild*>(actor);
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}
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void
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CacheChild::StartDestroyFromListener()
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{
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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_ASSERT(!mNumChildActors);
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StartDestroy();
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}
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void
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CacheChild::StartDestroy()
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{
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NS_ASSERT_OWNINGTHREAD(CacheChild);
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// If we have outstanding child actors, then don't destroy ourself yet.
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// The child actors should be short lived and we should allow them to complete
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// if possible. NoteDeletedActor() will call back into this Shutdown()
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// method when the last child actor is gone. Also, delay destruction if we
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// have been explicitly locked by someone using us on the stack.
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if (mNumChildActors || mLocked) {
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mDelayedDestroy = true;
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return;
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}
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RefPtr<Cache> listener = mListener;
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// StartDestroy() can get called from either Cache or the Feature.
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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_ASSERT(!mListener);
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// Start actor destruction from parent process
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Unused << SendTeardown();
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}
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void
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CacheChild::ActorDestroy(ActorDestroyReason aReason)
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{
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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_ASSERT(!mListener);
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}
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RemoveFeature();
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}
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PCacheOpChild*
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CacheChild::AllocPCacheOpChild(const CacheOpArgs& aOpArgs)
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{
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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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bool
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CacheChild::DeallocPCacheOpChild(PCacheOpChild* aActor)
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{
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delete aActor;
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NoteDeletedActor();
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return true;
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}
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PCachePushStreamChild*
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CacheChild::AllocPCachePushStreamChild()
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{
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MOZ_CRASH("CachePushStreamChild should be manually constructed.");
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return nullptr;
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}
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bool
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CacheChild::DeallocPCachePushStreamChild(PCachePushStreamChild* aActor)
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{
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delete aActor;
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NoteDeletedActor();
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return true;
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}
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void
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CacheChild::NoteDeletedActor()
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{
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mNumChildActors -= 1;
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MaybeFlushDelayedDestroy();
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}
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void
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CacheChild::MaybeFlushDelayedDestroy()
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{
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if (!mNumChildActors && !mLocked && mDelayedDestroy) {
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StartDestroy();
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}
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}
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void
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CacheChild::Lock()
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{
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NS_ASSERT_OWNINGTHREAD(CacheChild);
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MOZ_ASSERT(!mLocked);
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mLocked = true;
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}
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void
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CacheChild::Unlock()
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{
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NS_ASSERT_OWNINGTHREAD(CacheChild);
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MOZ_ASSERT(mLocked);
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mLocked = false;
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MaybeFlushDelayedDestroy();
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}
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} // namespace cache
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} // namespace dom
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} // namespace mozilla
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