BTreeRecoveryFactory.cpp

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00001 /*
00002 // $Id: //open/dev/fennel/btree/BTreeRecoveryFactory.cpp#8 $
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/btree/BTreeRecoveryFactory.h"
00026 #include "fennel/btree/BTreeWriter.h"
00027 #include "fennel/common/ByteInputStream.h"
00028 #include "fennel/tuple/TupleDescriptor.h"
00029 
00030 FENNEL_BEGIN_CPPFILE("$Id: //open/dev/fennel/btree/BTreeRecoveryFactory.cpp#8 $");
00031 
00032 BTreeRecoveryFactory::BTreeRecoveryFactory(
00033     SegmentAccessor segmentAccessortInit,
00034     SegmentAccessor scratchAccessortInit,
00035     StoredTypeDescriptorFactory const &typeFactoryInit)
00036     : segmentAccessor(segmentAccessortInit),
00037       scratchAccessor(scratchAccessortInit),
00038       typeFactory(typeFactoryInit)
00039 {
00040 }
00041 
00042 SharedLogicalTxnParticipant BTreeRecoveryFactory::loadParticipant(
00043     LogicalTxnClassId classId,
00044     ByteInputStream &logStream)
00045 {
00046     assert(classId == getParticipantClassId());
00047     BTreeDescriptor descriptor;
00048     logStream.readValue(descriptor.rootPageId);
00049     descriptor.segmentAccessor = segmentAccessor;
00050     descriptor.tupleDescriptor.readPersistent(logStream,typeFactory);
00051     descriptor.keyProjection.readPersistent(logStream);
00052 
00053     SharedLogicalTxnParticipant pParticipant = writerMap[descriptor.rootPageId];
00054     if (pParticipant) {
00055         return pParticipant;
00056     }
00057 
00058     pParticipant = SharedBTreeWriter(
00059         new BTreeWriter(
00060             descriptor,scratchAccessor));
00061 
00062     writerMap[descriptor.rootPageId] = pParticipant;
00063 
00064     return pParticipant;
00065 }
00066 
00067 LogicalTxnClassId BTreeRecoveryFactory::getParticipantClassId()
00068 {
00069     return LogicalTxnClassId(0x80890de8a406fdedLL);
00070 }
00071 
00072 FENNEL_END_CPPFILE("$Id: //open/dev/fennel/btree/BTreeRecoveryFactory.cpp#8 $");
00073 
00074 // End BTreeRecoveryFactory.cpp

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