Source Code Cross Referenced for Index4.java in  » Database-DBMS » db4o-6.4 » com » db4o » internal » ix » 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.internal.ix 
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.internal.ix;
022:
023:        import com.db4o.*;
024:        import com.db4o.foundation.*;
025:        import com.db4o.internal.*;
026:
027:        /**
028:         * 
029:         * @exclude
030:         */
031:        public class Index4 {
032:
033:            public final Indexable4 _handler;
034:
035:            static private int _version;
036:
037:            public final MetaIndex _metaIndex;
038:
039:            private IndexTransaction _globalIndexTransaction;
040:
041:            private Collection4 _indexTransactions;
042:
043:            private IxFileRangeReader _fileRangeReader;
044:
045:            final boolean _nullHandling;
046:
047:            public Index4(LocalTransaction systemTrans, Indexable4 handler,
048:                    MetaIndex metaIndex, boolean nullHandling) {
049:                _metaIndex = metaIndex;
050:                _handler = handler;
051:                _globalIndexTransaction = new IndexTransaction(systemTrans,
052:                        this );
053:                _nullHandling = nullHandling;
054:                createGlobalFileRange();
055:            }
056:
057:            public IndexTransaction dirtyIndexTransaction(
058:                    LocalTransaction a_trans) {
059:                IndexTransaction ift = new IndexTransaction(a_trans, this );
060:                if (_indexTransactions == null) {
061:                    _indexTransactions = new Collection4();
062:                } else {
063:                    IndexTransaction iftExisting = (IndexTransaction) _indexTransactions
064:                            .get(ift);
065:                    if (iftExisting != null) {
066:                        return iftExisting;
067:                    }
068:                }
069:                a_trans.addDirtyFieldIndex(ift);
070:                ift.setRoot(Tree.deepClone(_globalIndexTransaction.getRoot(),
071:                        ift));
072:                ift.i_version = ++_version;
073:                _indexTransactions.add(ift);
074:                return ift;
075:            }
076:
077:            public IndexTransaction globalIndexTransaction() {
078:                return _globalIndexTransaction;
079:            }
080:
081:            public IndexTransaction indexTransactionFor(LocalTransaction a_trans) {
082:                if (_indexTransactions != null) {
083:                    IndexTransaction ift = new IndexTransaction(a_trans, this );
084:                    ift = (IndexTransaction) _indexTransactions.get(ift);
085:                    if (ift != null) {
086:                        return ift;
087:                    }
088:                }
089:                return _globalIndexTransaction;
090:            }
091:
092:            private int[] freeForMetaIndex() {
093:                return new int[] { _metaIndex.indexAddress,
094:                        _metaIndex.indexLength,
095:                //            _metaIndex.patchAddress,
096:                //            _metaIndex.patchLength
097:                };
098:            }
099:
100:            private void doFree(int[] addressLength) {
101:                LocalObjectContainer yf = file();
102:                for (int i = 0; i < addressLength.length; i += 2) {
103:                    yf.free(addressLength[i], addressLength[i + 1]);
104:                }
105:            }
106:
107:            /**
108:             * solving a hen-egg problem: commit itself works with freespace 
109:             * so we have to do this all sequentially in the right way, working
110:             * with with both indexes at the same time.
111:             */
112:            public void commitFreeSpace(Index4 other) {
113:
114:                int entries = countEntries();
115:
116:                // For the two freespace indexes themselves, we call
117:                // the freespace system and we store two meta indexes. Potential effects:
118:                // 2 x getSlot   -2   to   0     
119:                // 4 x free      -4   to   + 4
120:                // 
121:
122:                // Therefore we have to raise the value by 4, to make 
123:                // sure that there are enough.
124:
125:                int length = (entries + 4) * lengthPerEntry();
126:
127:                int mySlot = getSlot(length);
128:                int otherSlot = getSlot(length);
129:                doFree(freeForMetaIndex());
130:                doFree(other.freeForMetaIndex());
131:
132:                entries = writeToNewSlot(mySlot);
133:                metaIndexSetMembers(entries, length, mySlot);
134:                createGlobalFileRange();
135:
136:                int otherEntries = other.writeToNewSlot(otherSlot);
137:
138:                if (Deploy.debug) {
139:                    if (entries != otherEntries) {
140:                        throw new RuntimeException("Should never happen");
141:                    }
142:                }
143:
144:                other.metaIndexSetMembers(entries, length, otherSlot);
145:                other.createGlobalFileRange();
146:            }
147:
148:            private int lengthPerEntry() {
149:                return _handler.linkLength() + Const4.INT_LENGTH;
150:            }
151:
152:            private void metaIndexStore(int entries, int length, int address) {
153:                Transaction transact = trans();
154:                metaIndexSetMembers(entries, length, address);
155:                transact.container()
156:                        .setInternal(transact, _metaIndex, 1, false);
157:            }
158:
159:            private void metaIndexSetMembers(int entries, int length,
160:                    int address) {
161:                _metaIndex.indexEntries = entries;
162:                _metaIndex.indexLength = length;
163:                _metaIndex.indexAddress = address;
164:            }
165:
166:            private int writeToNewSlot(int slot) {
167:                Tree root = getRoot();
168:                final StatefulBuffer writer = new StatefulBuffer(trans(), slot,
169:                        lengthPerEntry());
170:                final int[] entries = new int[] { 0 };
171:                if (root != null) {
172:                    root.traverse(new Visitor4() {
173:                        public void visit(Object a_object) {
174:                            entries[0] += ((IxTree) a_object).write(_handler,
175:                                    writer);
176:                        }
177:                    });
178:                }
179:                return entries[0];
180:            }
181:
182:            void commit(IndexTransaction ixTrans) {
183:
184:                _indexTransactions.remove(ixTrans);
185:                _globalIndexTransaction.merge(ixTrans);
186:
187:                // TODO: Use more intelligent heuristic here to
188:                // calculate when to flush the global index
189:
190:                // int leaves = _globalIndexTransaction.countLeaves();
191:                // boolean createNewFileRange = leaves > MAX_LEAVES;
192:
193:                boolean createNewFileRange = true;
194:
195:                if (createNewFileRange) {
196:
197:                    int entries = countEntries();
198:                    int length = countEntries() * lengthPerEntry();
199:                    int slot = getSlot(length);
200:
201:                    int[] free = freeForMetaIndex();
202:
203:                    metaIndexStore(entries, length, slot);
204:
205:                    writeToNewSlot(slot);
206:
207:                    IxFileRange newFileRange = createGlobalFileRange();
208:
209:                    if (_indexTransactions != null) {
210:                        Iterator4 i = _indexTransactions.iterator();
211:                        while (i.moveNext()) {
212:                            final IndexTransaction ft = (IndexTransaction) i
213:                                    .current();
214:                            Tree clonedTree = newFileRange;
215:                            if (clonedTree != null) {
216:                                clonedTree = (Tree) clonedTree.deepClone(ft);
217:                            }
218:                            final Tree.ByRef tree = new Tree.ByRef(clonedTree);
219:                            ft.getRoot().traverseFromLeaves((new Visitor4() {
220:
221:                                public void visit(Object a_object) {
222:                                    IxTree ixTree = (IxTree) a_object;
223:                                    if (ixTree._version == ft.i_version) {
224:                                        if (!(ixTree instanceof  IxFileRange)) {
225:                                            ixTree.beginMerge();
226:                                            tree.value = Tree.add(tree.value,
227:                                                    ixTree);
228:                                        }
229:                                    }
230:                                }
231:                            }));
232:                            ft.setRoot(tree.value);
233:                        }
234:                    }
235:
236:                    doFree(free);
237:
238:                } else {
239:                    Iterator4 i = _indexTransactions.iterator();
240:                    while (i.moveNext()) {
241:                        ((IndexTransaction) i.current()).merge(ixTrans);
242:                    }
243:                }
244:            }
245:
246:            private IxFileRange createGlobalFileRange() {
247:                IxFileRange fr = null;
248:                if (_metaIndex.indexEntries > 0) {
249:                    fr = new IxFileRange(_globalIndexTransaction,
250:                            _metaIndex.indexAddress, 0, _metaIndex.indexEntries);
251:                }
252:                _globalIndexTransaction.setRoot(fr);
253:                return fr;
254:            }
255:
256:            void rollback(IndexTransaction a_ft) {
257:                _indexTransactions.remove(a_ft);
258:            }
259:
260:            IxFileRangeReader fileRangeReader() {
261:                if (_fileRangeReader == null) {
262:                    _fileRangeReader = new IxFileRangeReader(_handler);
263:                }
264:                return _fileRangeReader;
265:            }
266:
267:            public String toString() {
268:                if (!Debug4.prettyToStrings) {
269:                    return super .toString();
270:                }
271:                StringBuffer sb = new StringBuffer();
272:                sb.append("IxField  " + System.identityHashCode(this ));
273:                if (_globalIndexTransaction != null) {
274:                    sb.append("\n  Global \n   ");
275:                    sb.append(_globalIndexTransaction.toString());
276:                } else {
277:                    sb.append("\n  no global index \n   ");
278:                }
279:                if (_indexTransactions != null) {
280:                    Iterator4 i = _indexTransactions.iterator();
281:                    while (i.moveNext()) {
282:                        sb.append("\n");
283:                        sb.append(i.current().toString());
284:                    }
285:                }
286:                return sb.toString();
287:            }
288:
289:            private LocalTransaction trans() {
290:                return _globalIndexTransaction.i_trans;
291:            }
292:
293:            private LocalObjectContainer file() {
294:                return trans().file();
295:            }
296:
297:            private int getSlot(int length) {
298:                return file().getSlot(length).address();
299:            }
300:
301:            private Tree getRoot() {
302:                return _globalIndexTransaction.getRoot();
303:            }
304:
305:            private int countEntries() {
306:                Tree root = getRoot();
307:                return root == null ? 0 : root.size();
308:            }
309:
310:        }
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