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/*
* 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.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_DOM_ID_TARGET_OBSERVER_REGISTRY_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_DOM_ID_TARGET_OBSERVER_REGISTRY_H_
#include "base/macros.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
#include "third_party/blink/renderer/platform/wtf/hash_map.h"
#include "third_party/blink/renderer/platform/wtf/hash_set.h"
#include "third_party/blink/renderer/platform/wtf/text/string_hash.h"
namespace blink {
class IdTargetObserver;
class IdTargetObserverRegistry final
: public GarbageCollected<IdTargetObserverRegistry> {
friend class IdTargetObserver;
public:
static IdTargetObserverRegistry* Create();
void Trace(blink::Visitor*);
void NotifyObservers(const AtomicString& id);
bool HasObservers(const AtomicString& id) const;
private:
IdTargetObserverRegistry() : notifying_observers_in_set_(nullptr) {}
void AddObserver(const AtomicString& id, IdTargetObserver*);
void RemoveObserver(const AtomicString& id, IdTargetObserver*);
void NotifyObserversInternal(const AtomicString& id);
typedef HeapHashSet<Member<IdTargetObserver>> ObserverSet;
typedef HeapHashMap<StringImpl*, Member<ObserverSet>> IdToObserverSetMap;
IdToObserverSetMap registry_;
Member<ObserverSet> notifying_observers_in_set_;
DISALLOW_COPY_AND_ASSIGN(IdTargetObserverRegistry);
};
inline void IdTargetObserverRegistry::NotifyObservers(const AtomicString& id) {
DCHECK(!notifying_observers_in_set_);
if (id.IsEmpty() || registry_.IsEmpty())
return;
IdTargetObserverRegistry::NotifyObserversInternal(id);
}
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_DOM_ID_TARGET_OBSERVER_REGISTRY_H_
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