blob: a1e63ace13f3033c431a889f7a6d20d59aa7cf2a [file] [log] [blame]
/*
* Copyright (C) 2012 Google 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. ``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 <memory>
#include <wtf/Forward.h>
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/text/AtomString.h>
namespace WebCore {
class IdTargetObserver;
class IdTargetObserverRegistry {
WTF_MAKE_FAST_ALLOCATED;
friend class IdTargetObserver;
public:
IdTargetObserverRegistry() { }
void notifyObservers(const AtomString& id);
void notifyObservers(const AtomStringImpl& id);
private:
void addObserver(const AtomString& id, IdTargetObserver*);
void removeObserver(const AtomString& id, IdTargetObserver*);
void notifyObserversInternal(const AtomStringImpl& id);
typedef HashSet<IdTargetObserver*> ObserverSet;
typedef HashMap<const AtomStringImpl*, std::unique_ptr<ObserverSet>> IdToObserverSetMap;
IdToObserverSetMap m_registry;
ObserverSet* m_notifyingObserversInSet { nullptr };
};
inline void IdTargetObserverRegistry::notifyObservers(const AtomString& id)
{
if (!id.isEmpty())
return notifyObservers(*id.impl());
}
inline void IdTargetObserverRegistry::notifyObservers(const AtomStringImpl& id)
{
ASSERT(!m_notifyingObserversInSet);
ASSERT(id.length());
if (m_registry.isEmpty())
return;
IdTargetObserverRegistry::notifyObserversInternal(id);
}
} // namespace WebCore