CachePage.cpp

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00001 /*
00002 // $Id: //open/dev/fennel/cache/CachePage.cpp#9 $
00003 // Fennel is a library of data storage and processing components.
00004 // Copyright (C) 2005-2009 The Eigenbase Project
00005 // Copyright (C) 2005-2009 SQLstream, Inc.
00006 // Copyright (C) 2005-2009 LucidEra, Inc.
00007 // Portions Copyright (C) 1999-2009 John V. Sichi
00008 //
00009 // This program is free software; you can redistribute it and/or modify it
00010 // under the terms of the GNU General Public License as published by the Free
00011 // Software Foundation; either version 2 of the License, or (at your option)
00012 // any later version approved by The Eigenbase Project.
00013 //
00014 // This program is distributed in the hope that it will be useful,
00015 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00016 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00017 // GNU General Public License for more details.
00018 //
00019 // You should have received a copy of the GNU General Public License
00020 // along with this program; if not, write to the Free Software
00021 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00022 */
00023 
00024 #include "fennel/common/CommonPreamble.h"
00025 #include "fennel/cache/Cache.h"
00026 #include "fennel/cache/CachePage.h"
00027 #include "fennel/common/CompoundId.h"
00028 
00029 #include <algorithm>
00030 
00031 FENNEL_BEGIN_CPPFILE("$Id: //open/dev/fennel/cache/CachePage.cpp#9 $");
00032 
00033 CachePage::CachePage(Cache &cacheInit,PBuffer pBufferInit)
00034     : cache(cacheInit)
00035 {
00036     nReferences = 0;
00037     dataStatus = DATA_INVALID;
00038     blockId = NULL_BLOCK_ID;
00039     pBuffer = pBufferInit;
00040     pMappedPageListener = NULL;
00041 }
00042 
00043 CachePage::~CachePage()
00044 {
00045     assert(!nReferences);
00046     assert(blockId == NULL_BLOCK_ID);
00047     assert(dataStatus == DATA_INVALID);
00048 }
00049 
00050 void CachePage::notifyTransferCompletion(bool bSuccess)
00051 {
00052     getCache().notifyTransferCompletion(*this,bSuccess);
00053 }
00054 
00055 PBuffer CachePage::getBuffer() const
00056 {
00057     return pBuffer;
00058 }
00059 
00060 uint CachePage::getBufferSize() const
00061 {
00062     return cache.getPageSize();
00063 }
00064 
00065 void CachePage::swapBuffers(CachePage &other)
00066 {
00067     assert(isExclusiveLockHeld());
00068     assert(other.isExclusiveLockHeld());
00069     std::swap(pBuffer,other.pBuffer);
00070 }
00071 
00072 bool CachePage::isScratchLocked() const
00073 {
00074     return CompoundId::getDeviceId(getBlockId()) == Cache::NULL_DEVICE_ID;
00075 }
00076 
00077 FENNEL_END_CPPFILE("$Id: //open/dev/fennel/cache/CachePage.cpp#9 $");
00078 
00079 // End CachePage.cpp

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