1/* 2 * Copyright (C) 2012 Google Inc. All Rights Reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef IdTargetObserverRegistry_h 27#define IdTargetObserverRegistry_h 28 29#include <memory> 30#include <wtf/Forward.h> 31#include <wtf/HashMap.h> 32#include <wtf/HashSet.h> 33#include <wtf/text/AtomicString.h> 34 35namespace WebCore { 36 37class IdTargetObserver; 38 39class IdTargetObserverRegistry { 40 WTF_MAKE_FAST_ALLOCATED; 41 friend class IdTargetObserver; 42public: 43 IdTargetObserverRegistry() 44 : m_notifyingObserversInSet(0) 45 { } 46 47 void notifyObservers(const AtomicString& id); 48 void notifyObservers(const AtomicStringImpl& id); 49 50private: 51 void addObserver(const AtomicString& id, IdTargetObserver*); 52 void removeObserver(const AtomicString& id, IdTargetObserver*); 53 void notifyObserversInternal(const AtomicStringImpl& id); 54 55 typedef HashSet<IdTargetObserver*> ObserverSet; 56 typedef HashMap<const AtomicStringImpl*, std::unique_ptr<ObserverSet>> IdToObserverSetMap; 57 IdToObserverSetMap m_registry; 58 ObserverSet* m_notifyingObserversInSet; 59}; 60 61inline void IdTargetObserverRegistry::notifyObservers(const AtomicString& id) 62{ 63 if (!id.isEmpty()) 64 return notifyObservers(*id.impl()); 65} 66 67inline void IdTargetObserverRegistry::notifyObservers(const AtomicStringImpl& id) 68{ 69 ASSERT(!m_notifyingObserversInSet); 70 ASSERT(id.length()); 71 if (m_registry.isEmpty()) 72 return; 73 IdTargetObserverRegistry::notifyObserversInternal(id); 74} 75 76} // namespace WebCore 77 78#endif // IdTargetObserverRegistry_h 79