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/*
* Copyright (C) 2018 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "MessagePortChannelProvider.h"
#include "Document.h"
#include "MessagePortChannelProviderImpl.h"
#include "WorkerGlobalScope.h"
#include "WorkletGlobalScope.h"
#include <wtf/MainThread.h>
#include <wtf/NeverDestroyed.h>
namespace WebCore {
static WeakPtr<MessagePortChannelProvider>& globalProvider()
{
static MainThreadNeverDestroyed<WeakPtr<MessagePortChannelProvider>> globalProvider;
return globalProvider;
}
MessagePortChannelProvider& MessagePortChannelProvider::singleton()
{
ASSERT(isMainThread());
auto& globalProvider = WebCore::globalProvider();
if (!globalProvider)
globalProvider = new MessagePortChannelProviderImpl;
return *globalProvider;
}
void MessagePortChannelProvider::setSharedProvider(MessagePortChannelProvider& provider)
{
RELEASE_ASSERT(isMainThread());
auto& globalProvider = WebCore::globalProvider();
RELEASE_ASSERT(!globalProvider);
globalProvider = provider;
}
MessagePortChannelProvider& MessagePortChannelProvider::fromContext(ScriptExecutionContext& context)
{
if (auto document = dynamicDowncast<Document>(context))
return document->messagePortChannelProvider();
if (auto workletScope = dynamicDowncast<WorkletGlobalScope>(context))
return workletScope->messagePortChannelProvider();
return downcast<WorkerGlobalScope>(context).messagePortChannelProvider();
}
} // namespace WebCore
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