gecko-dev/dom/broadcastchannel/BroadcastChannelService.cpp

141 строка
3.8 KiB
C++

/* -*- 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 "BroadcastChannelService.h"
#include "BroadcastChannelParent.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/IPCBlobUtils.h"
#include "mozilla/ipc/BackgroundParent.h"
#ifdef XP_WIN
# undef PostMessage
#endif
namespace mozilla {
using namespace ipc;
namespace dom {
namespace {
BroadcastChannelService* sInstance = nullptr;
} // namespace
BroadcastChannelService::BroadcastChannelService() {
AssertIsOnBackgroundThread();
// sInstance is a raw BroadcastChannelService*.
MOZ_ASSERT(!sInstance);
sInstance = this;
}
BroadcastChannelService::~BroadcastChannelService() {
AssertIsOnBackgroundThread();
MOZ_ASSERT(sInstance == this);
MOZ_ASSERT(mAgents.Count() == 0);
sInstance = nullptr;
}
// static
already_AddRefed<BroadcastChannelService>
BroadcastChannelService::GetOrCreate() {
AssertIsOnBackgroundThread();
RefPtr<BroadcastChannelService> instance = sInstance;
if (!instance) {
instance = new BroadcastChannelService();
}
return instance.forget();
}
void BroadcastChannelService::RegisterActor(
BroadcastChannelParent* aParent, const nsAString& aOriginChannelKey) {
AssertIsOnBackgroundThread();
MOZ_ASSERT(aParent);
nsTArray<BroadcastChannelParent*>* parents =
mAgents.LookupForAdd(aOriginChannelKey).OrInsert([]() {
return new nsTArray<BroadcastChannelParent*>();
});
MOZ_ASSERT(!parents->Contains(aParent));
parents->AppendElement(aParent);
}
void BroadcastChannelService::UnregisterActor(
BroadcastChannelParent* aParent, const nsAString& aOriginChannelKey) {
AssertIsOnBackgroundThread();
MOZ_ASSERT(aParent);
if (auto entry = mAgents.Lookup(aOriginChannelKey)) {
entry.Data()->RemoveElement(aParent);
// remove the entry if the array is now empty
if (entry.Data()->IsEmpty()) {
entry.Remove();
}
} else {
MOZ_CRASH("Invalid state");
}
}
void BroadcastChannelService::PostMessage(BroadcastChannelParent* aParent,
const ClonedMessageData& aData,
const nsAString& aOriginChannelKey) {
AssertIsOnBackgroundThread();
MOZ_ASSERT(aParent);
nsTArray<BroadcastChannelParent*>* parents;
if (!mAgents.Get(aOriginChannelKey, &parents)) {
MOZ_CRASH("Invalid state");
}
// We need to keep the array alive for the life-time of this operation.
nsTArray<RefPtr<BlobImpl>> blobImpls;
if (!aData.blobs().IsEmpty()) {
blobImpls.SetCapacity(aData.blobs().Length());
for (uint32_t i = 0, len = aData.blobs().Length(); i < len; ++i) {
RefPtr<BlobImpl> impl = IPCBlobUtils::Deserialize(aData.blobs()[i]);
MOZ_ASSERT(impl);
blobImpls.AppendElement(impl);
}
}
// For each parent actor, we notify the message.
for (uint32_t i = 0; i < parents->Length(); ++i) {
BroadcastChannelParent* parent = parents->ElementAt(i);
MOZ_ASSERT(parent);
if (parent == aParent) {
continue;
}
// We need to have a copy of the data for this parent.
ClonedMessageData newData(aData);
MOZ_ASSERT(blobImpls.Length() == newData.blobs().Length());
if (!blobImpls.IsEmpty()) {
// Serialize Blob objects for this message.
for (uint32_t i = 0, len = blobImpls.Length(); i < len; ++i) {
nsresult rv = IPCBlobUtils::Serialize(blobImpls[i], parent->Manager(),
newData.blobs()[i]);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
}
}
Unused << parent->SendNotify(newData);
}
}
} // namespace dom
} // namespace mozilla