Source Code Cross Referenced for SecondPassCommand.java in  » Database-DBMS » db4o-6.4 » com » db4o » defragment » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db4o 6.4 » com.db4o.defragment 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Copyright (C) 2004 - 2007  db4objects Inc.  http://www.db4o.com
002:
003:        This file is part of the db4o open source object database.
004:
005:        db4o is free software; you can redistribute it and/or modify it under
006:        the terms of version 2 of the GNU General Public License as published
007:        by the Free Software Foundation and as clarified by db4objects' GPL 
008:        interpretation policy, available at
009:        http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
010:        Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
011:        Suite 350, San Mateo, CA 94403, USA.
012:
013:        db4o is distributed in the hope that it will be useful, but WITHOUT ANY
014:        WARRANTY; without even the implied warranty of MERCHANTABILITY or
015:        FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
016:        for more details.
017:
018:        You should have received a copy of the GNU General Public License along
019:        with this program; if not, write to the Free Software Foundation, Inc.,
020:        59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
021:        package com.db4o.defragment;
022:
023:        import java.io.IOException;
024:
025:        import com.db4o.*;
026:        import com.db4o.internal.*;
027:        import com.db4o.internal.btree.*;
028:        import com.db4o.internal.marshall.*;
029:
030:        /**
031:         * Second step in the defragmenting process: Fills in target file pointer slots, copies
032:         * content slots from source to target and triggers ID remapping therein by calling the
033:         * appropriate yap/marshaller defrag() implementations. During the process, the actual address
034:         * mappings for the content slots are registered for use with string indices.
035:         * 
036:         * @exclude
037:         */
038:        final class SecondPassCommand implements  PassCommand {
039:
040:            protected final int _objectCommitFrequency;
041:            protected int _objectCount = 0;
042:
043:            public SecondPassCommand(int objectCommitFrequency) {
044:                _objectCommitFrequency = objectCommitFrequency;
045:            }
046:
047:            public void processClass(final DefragContextImpl context,
048:                    final ClassMetadata yapClass, int id, final int classIndexID)
049:                    throws CorruptionException, IOException {
050:                if (context.mappedID(id, -1) == -1) {
051:                    System.err.println("MAPPING NOT FOUND: " + id);
052:                }
053:                BufferPair.processCopy(context, id, new SlotCopyHandler() {
054:                    public void processCopy(BufferPair readers)
055:                            throws CorruptionException, IOException {
056:                        yapClass.defragClass(readers, classIndexID);
057:                    }
058:                });
059:            }
060:
061:            public void processObjectSlot(final DefragContextImpl context,
062:                    final ClassMetadata yapClass, int id)
063:                    throws CorruptionException, IOException {
064:                Buffer sourceBuffer = context.sourceBufferByID(id);
065:                ObjectHeader objHead = context.sourceObjectHeader(sourceBuffer);
066:                sourceBuffer._offset = 0;
067:                boolean registerAddresses = context.hasFieldIndex(objHead
068:                        .classMetadata());
069:                BufferPair.processCopy(context, id, new SlotCopyHandler() {
070:                    public void processCopy(BufferPair buffers) {
071:                        ClassMetadata.defragObject(buffers);
072:                        if (_objectCommitFrequency > 0) {
073:                            _objectCount++;
074:                            if (_objectCount == _objectCommitFrequency) {
075:                                context.targetCommit();
076:                                _objectCount = 0;
077:                            }
078:                        }
079:                    }
080:                }, registerAddresses, sourceBuffer);
081:            }
082:
083:            public void processClassCollection(DefragContextImpl context)
084:                    throws CorruptionException, IOException {
085:                BufferPair.processCopy(context, context
086:                        .sourceClassCollectionID(), new SlotCopyHandler() {
087:                    public void processCopy(BufferPair readers) {
088:                        ClassMetadataRepository.defrag(readers);
089:                    }
090:                });
091:            }
092:
093:            public void processBTree(final DefragContextImpl context,
094:                    BTree btree) throws CorruptionException, IOException {
095:                btree.defragBTree(context);
096:            }
097:
098:            public void flush(DefragContextImpl context) {
099:            }
100:        }
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