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/*
* Copyright (C) 2009 Apple Inc. All Rights Reserved.
* Copyright (C) 2012 Igalia S.L.
*
* 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 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
* 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.
*/
#pragma once
#include "DNS.h"
#include "Timer.h"
#include <atomic>
#include <wtf/Forward.h>
#include <wtf/HashSet.h>
#include <wtf/text/StringHash.h>
namespace WebCore {
class DNSResolveQueue {
friend NeverDestroyed<DNSResolveQueue>;
public:
DNSResolveQueue();
virtual ~DNSResolveQueue() = default;
static DNSResolveQueue& singleton();
virtual void resolve(const String& hostname, uint64_t identifier, DNSCompletionHandler&&) = 0;
virtual void stopResolve(uint64_t identifier) = 0;
void add(const String& hostname);
void decrementRequestCount()
{
--m_requestsInFlight;
}
protected:
bool isUsingProxy();
bool m_isUsingProxy { true };
private:
virtual void updateIsUsingProxy() = 0;
virtual void platformResolve(const String&) = 0;
void timerFired();
Timer m_timer;
HashSet<String> m_names;
std::atomic<int> m_requestsInFlight;
MonotonicTime m_lastProxyEnabledStatusCheckTime;
};
}
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