firefox-main/dom/broadcastchannel/BroadcastChannelService.cpp (file symbol)

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/* 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/BlobImpl.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/IPCBlobUtils.h"
#include "mozilla/dom/SharedMessageBody.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);
auto* const parents = mAgents.GetOrInsertNew(aOriginChannelKey);
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,
NotNull<SharedMessageBody*> aData,
const nsAString& aOriginChannelKey) {
AssertIsOnBackgroundThread();
MOZ_ASSERT(aParent);
nsTArray<BroadcastChannelParent*>* parents;
if (!mAgents.Get(aOriginChannelKey, &parents)) {
MOZ_CRASH("Invalid state");
}
uint32_t selectedActorsOnSamePid = 0;
// 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;
}
if (parent->OtherChildID() == aParent->OtherChildID()) {
++selectedActorsOnSamePid;
}
(void)parent->SendNotify(aData);
}
// If this is a refMessageData, we need to know when it can be released.
if (aData->GetRefDataId()) {
(void)aParent->SendRefMessageDelivered(*aData->GetRefDataId(),
selectedActorsOnSamePid);
}
}
} // namespace dom
} // namespace mozilla