MockSegPageEntryIterSource.cpp

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00001 /*
00002 // $Id: //open/dev/fennel/segment/MockSegPageEntryIterSource.cpp#3 $
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/segment/MockSegPageEntryIterSource.h"
00026 #include "fennel/segment/Segment.h"
00027 
00028 FENNEL_BEGIN_CPPFILE("$Id: //open/dev/fennel/segment/MockSegPageEntryIterSource.cpp#3 $");
00029 
00030 MockSegPageEntryIterSource::MockSegPageEntryIterSource(
00031     SegmentAccessor const &segmentAccessorInit,
00032     PageId beginPageId)
00033     : SegPageEntryIterSource<int>()
00034 {
00035     counter = 0;
00036     segmentAccessor = segmentAccessorInit;
00037     nextPageId = beginPageId;
00038 }
00039 
00040 MockSegPageEntryIterSource::~MockSegPageEntryIterSource()
00041 {
00042 }
00043 
00044 PageId MockSegPageEntryIterSource::getNextPageForPrefetch(
00045     int &entry,
00046     bool &found)
00047 {
00048     found = true;
00049     entry = counter++;
00050     // Only need to figure out the next page on every other iteration
00051     if (counter % 2) {
00052         return nextPageId;
00053     }
00054     PageId currPageId = nextPageId;
00055     nextPageId = segmentAccessor.pSegment->getPageSuccessor(nextPageId);
00056     if (nextPageId != NULL_PAGE_ID) {
00057         nextPageId = segmentAccessor.pSegment->getPageSuccessor(nextPageId);
00058     }
00059     return currPageId;
00060 }
00061 
00062 FENNEL_END_CPPFILE("$Id:");
00063 
00064 // End MockSegPageEntryIterSource.cpp

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