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/*
* 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/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&);
std::optional<SharedMemory::Handle> createSharedMemoryHandle();
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 newTableLength);
void processPendingOperations();
struct Operation {
enum Type { Add, Remove };
Type type;
WebCore::SharedStringHash sharedStringHash;
};
Client& m_client;
unsigned m_keyCount { 0 };
unsigned m_tableLength { 0 };
SharedStringHashTable m_table;
Vector<Operation> m_pendingOperations;
RunLoop::Timer m_pendingOperationsTimer;
};
} // namespace WebKit
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