| /* |
| * Copyright (C) 2010-2017 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. |
| */ |
| |
| #pragma once |
| |
| #include "SharedMemory.h" |
| #include "SharedStringHashTable.h" |
| #include <WebCore/SharedStringHash.h> |
| #include <wtf/HashSet.h> |
| #include <wtf/RunLoop.h> |
| |
| namespace WebKit { |
| |
| class SharedStringHashStore { |
| public: |
| class Client { |
| public: |
| virtual ~Client() { } |
| |
| virtual void didInvalidateSharedMemory() = 0; |
| virtual void didUpdateSharedStringHashes(const Vector<WebCore::SharedStringHash>& addedHashes, const Vector<WebCore::SharedStringHash>& removedHashes) { }; |
| }; |
| |
| SharedStringHashStore(Client&); |
| |
| bool createSharedMemoryHandle(SharedMemory::Handle&); |
| |
| void scheduleAddition(WebCore::SharedStringHash); |
| void scheduleRemoval(WebCore::SharedStringHash); |
| |
| bool contains(WebCore::SharedStringHash); |
| void clear(); |
| |
| bool isEmpty() const { return !m_keyCount; } |
| |
| void flushPendingChanges(); |
| |
| private: |
| void resizeTable(unsigned newTableSize); |
| void processPendingOperations(); |
| |
| struct Operation { |
| enum Type { Add, Remove }; |
| Type type; |
| WebCore::SharedStringHash sharedStringHash; |
| }; |
| |
| Client& m_client; |
| unsigned m_keyCount { 0 }; |
| unsigned m_tableSize { 0 }; |
| SharedStringHashTable m_table; |
| Vector<Operation> m_pendingOperations; |
| RunLoop::Timer<SharedStringHashStore> m_pendingOperationsTimer; |
| }; |
| |
| } // namespace WebKit |