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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