126 lines
3.4 KiB
C++
126 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#ifndef INCLUDED_STORE_SOURCE_STORCACH_HXX
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#define INCLUDED_STORE_SOURCE_STORCACH_HXX
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#include "sal/types.h"
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#include "rtl/ref.hxx"
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#include "store/types.h"
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#include "storbase.hxx"
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#include "object.hxx"
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#include "boost/noncopyable.hpp"
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namespace store
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{
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struct Entry;
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/*========================================================================
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*
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* PageCache interface.
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*
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*======================================================================*/
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class PageCache :
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public store::OStoreObject,
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private boost::noncopyable
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{
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// Representation
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static size_t const theTableSize = 32;
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static_assert(STORE_IMPL_ISP2(theTableSize), "must be the case");
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Entry ** m_hash_table;
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Entry * m_hash_table_0[theTableSize];
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size_t m_hash_size;
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size_t m_hash_shift;
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size_t const m_page_shift;
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size_t m_hash_entries; // total number of entries in table.
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size_t m_nHit;
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size_t m_nMissed;
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static inline int hash_Impl(sal_uInt32 a, size_t s, size_t q, size_t m)
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{
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return static_cast<int>((((a) + ((a) >> (s)) + ((a) >> ((s) << 1))) >> (q)) & (m));
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}
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inline int hash_index_Impl (sal_uInt32 nOffset)
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{
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return hash_Impl(nOffset, m_hash_shift, m_page_shift, m_hash_size - 1);
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}
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Entry * lookup_Impl (Entry * entry, sal_uInt32 nOffset);
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void rescale_Impl (sal_Size new_size);
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public:
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// Construction
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explicit PageCache (sal_uInt16 nPageSize);
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/** load.
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*/
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storeError lookupPageAt (
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PageHolder & rxPage,
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sal_uInt32 nOffset);
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/** insert.
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*/
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storeError insertPageAt (
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PageHolder const & rxPage,
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sal_uInt32 nOffset);
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/** update, or insert.
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*/
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storeError updatePageAt (
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PageHolder const & rxPage,
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sal_uInt32 nOffset);
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/** remove (invalidate).
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*/
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storeError removePageAt (
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sal_uInt32 nOffset);
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protected:
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// Destruction
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virtual ~PageCache();
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};
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/*========================================================================
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*
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* PageCache factory.
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*
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*======================================================================*/
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storeError
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PageCache_createInstance (
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rtl::Reference< store::PageCache > & rxCache,
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sal_uInt16 nPageSize
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);
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/*========================================================================
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*
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* The End.
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*
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*======================================================================*/
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} // namespace store
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#endif // INCLUDED_STORE_SOURCE_STORCACH_HXX
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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