Source Code Cross Referenced for SleepycatPersistableMap.java in  » Net » Terracotta » com » tc » objectserver » persistence » sleepycat » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » Terracotta » com.tc.objectserver.persistence.sleepycat 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * All content copyright (c) 2003-2006 Terracotta, Inc., except as may otherwise be noted in a separate copyright
003:         * notice. All rights reserved.
004:         */
005:        package com.tc.objectserver.persistence.sleepycat;
006:
007:        import com.sleepycat.je.Cursor;
008:        import com.sleepycat.je.CursorConfig;
009:        import com.sleepycat.je.Database;
010:        import com.sleepycat.je.DatabaseEntry;
011:        import com.sleepycat.je.DatabaseException;
012:        import com.sleepycat.je.LockMode;
013:        import com.sleepycat.je.OperationStatus;
014:        import com.tc.object.ObjectID;
015:        import com.tc.objectserver.persistence.api.PersistenceTransaction;
016:        import com.tc.util.Conversion;
017:
018:        import gnu.trove.THashMap;
019:
020:        import java.io.IOException;
021:        import java.util.Collection;
022:        import java.util.Iterator;
023:        import java.util.Map;
024:        import java.util.Set;
025:
026:        public class SleepycatPersistableMap implements  Map {
027:
028:            private static final Object REMOVED = new Object();
029:
030:            /*
031:             * This map contains the mappings already in the database
032:             */
033:            private final Map map = new THashMap(0);
034:
035:            /*
036:             * This map contains the newly added mappings that are not in the database yet
037:             */
038:            private final Map delta = new THashMap(0);
039:
040:            private final long id;
041:            private int removeCount = 0;
042:            private boolean clear = false;
043:
044:            public SleepycatPersistableMap(ObjectID id) {
045:                this .id = id.toLong();
046:            }
047:
048:            public int size() {
049:                return map.size() + delta.size() - removeCount;
050:            }
051:
052:            public boolean isEmpty() {
053:                return size() == 0;
054:            }
055:
056:            public boolean containsKey(Object key) {
057:                Object value;
058:                // NOTE:: map cant have mapping to null, it is always mapped to ObjectID.NULL_ID
059:                return delta.containsKey(key)
060:                        || ((value = map.get(key)) != null && value != REMOVED);
061:            }
062:
063:            public boolean containsValue(Object value) {
064:                return delta.containsValue(value) || map.containsValue(value);
065:            }
066:
067:            public Object get(Object key) {
068:                Object value = delta.get(key);
069:                if (value == null) {
070:                    value = map.get(key);
071:                    if (value == REMOVED)
072:                        value = null;
073:                }
074:                return value;
075:            }
076:
077:            public Object put(Object key, Object value) {
078:                Object returnVal = delta.put(key, value);
079:                if (returnVal != null) {
080:                    return returnVal;
081:                }
082:                if (map.containsKey(key)) {
083:                    returnVal = map.put(key, REMOVED);
084:                    if (returnVal == REMOVED) {
085:                        return null;
086:                    }
087:                    removeCount++;
088:                }
089:                return returnVal;
090:            }
091:
092:            public Object remove(Object key) {
093:                Object returnVal = delta.remove(key);
094:                if (returnVal != null) {
095:                    return returnVal;
096:                }
097:                if (map.containsKey(key)) {
098:                    returnVal = map.put(key, REMOVED);
099:                    if (returnVal == REMOVED) {
100:                        return null;
101:                    }
102:                    removeCount++;
103:                }
104:                return returnVal;
105:            }
106:
107:            public void putAll(Map m) {
108:                for (Iterator i = m.entrySet().iterator(); i.hasNext();) {
109:                    Map.Entry entry = (Map.Entry) i.next();
110:                    put(entry.getKey(), entry.getValue());
111:                }
112:            }
113:
114:            public void clear() {
115:                clear = true;
116:                // XXX:: May be saving the keys to remove will be faster as sleepycat has to read/fault all records on clear. But
117:                // then it is memory to performance trade off.
118:                delta.clear();
119:                map.clear();
120:                removeCount = 0;
121:            }
122:
123:            public Set keySet() {
124:                return new KeyView();
125:            }
126:
127:            public Collection values() {
128:                return new ValuesView();
129:            }
130:
131:            public Set entrySet() {
132:                return new EntryView();
133:            }
134:
135:            public void commit(SleepycatCollectionsPersistor persistor,
136:                    PersistenceTransaction tx, Database db) throws IOException,
137:                    DatabaseException {
138:                // long t1 = System.currentTimeMillis();
139:                // StringBuffer sb = new StringBuffer("Time to commit : ");
140:
141:                // First :: clear the map if necessary
142:                if (clear) {
143:                    basicClear(persistor, tx, db);
144:                    clear = false;
145:                    // sb.append(" clear = ").append((System.currentTimeMillis() - t1)).append(" ms : ");
146:                    // t1 = System.currentTimeMillis();
147:                }
148:
149:                // Second :: put new or changed objects
150:                if (delta.size() > 0) {
151:                    basicPut(persistor, tx, db);
152:                    // sb.append(" put(").append(delta.size()).append(") = ").append((System.currentTimeMillis() - t1)).append(" ms :
153:                    // ");
154:                    // t1 = System.currentTimeMillis();
155:                    delta.clear();
156:                }
157:
158:                // Third :: remove old mappings :: This is slightly inefficient for huge maps. Keeping track of removed records is
159:                // again a trade off between memory and performance
160:                if (removeCount > 0) {
161:                    basicRemove(persistor, tx, db);
162:                    // sb.append(" remove(").append(removeCount).append(") = ").append((System.currentTimeMillis() - t1))
163:                    // .append(" ms : ");
164:                    removeCount = 0;
165:                }
166:                // flakyLogger(sb.toString(), t1);
167:            }
168:
169:            private void basicRemove(SleepycatCollectionsPersistor persistor,
170:                    PersistenceTransaction tx, Database db) throws IOException,
171:                    DatabaseException {
172:                for (Iterator i = map.entrySet().iterator(); i.hasNext();) {
173:                    Map.Entry e = (Entry) i.next();
174:                    Object k = e.getKey();
175:                    Object v = e.getValue();
176:                    if (v == REMOVED) {
177:                        DatabaseEntry key = new DatabaseEntry();
178:                        key.setData(persistor.serialize(id, k));
179:                        OperationStatus status = db.delete(persistor.pt2nt(tx),
180:                                key);
181:                        if (!(OperationStatus.NOTFOUND.equals(status) || OperationStatus.SUCCESS
182:                                .equals(status))) {
183:                            // make the formatter happy
184:                            throw new DBException(
185:                                    "Unable to remove Map Entry for object id: "
186:                                            + id + ", status: " + status
187:                                            + ", key: " + key);
188:                        }
189:                        i.remove();
190:                    }
191:                }
192:
193:            }
194:
195:            private void basicPut(SleepycatCollectionsPersistor persistor,
196:                    PersistenceTransaction tx, Database db) throws IOException,
197:                    DatabaseException {
198:                for (Iterator i = delta.entrySet().iterator(); i.hasNext();) {
199:                    Map.Entry e = (Entry) i.next();
200:                    Object k = e.getKey();
201:                    Object v = e.getValue();
202:                    DatabaseEntry key = new DatabaseEntry();
203:                    key.setData(persistor.serialize(id, k));
204:                    DatabaseEntry value = new DatabaseEntry();
205:                    value.setData(persistor.serialize(v));
206:                    OperationStatus status = db.put(persistor.pt2nt(tx), key,
207:                            value);
208:                    if (!OperationStatus.SUCCESS.equals(status)) {
209:                        throw new DBException("Unable to update Map table : "
210:                                + id + " status : " + status);
211:                    }
212:                    map.put(k, v);
213:                }
214:            }
215:
216:            private void basicClear(SleepycatCollectionsPersistor persistor,
217:                    PersistenceTransaction tx, Database db)
218:                    throws DatabaseException {
219:                // XXX::Sleepycat has the most inefficent way to delete objects. Another way would be to delete all records
220:                // explicitly.
221:                // XXX:: Since we read in one direction and since we have to read the first record of the next map to break out, we
222:                // need READ_COMMITTED to avoid deadlocks between commit thread and GC thread.
223:                Cursor c = db.openCursor(persistor.pt2nt(tx),
224:                        CursorConfig.READ_COMMITTED);
225:                byte idb[] = Conversion.long2Bytes(id);
226:                DatabaseEntry key = new DatabaseEntry();
227:                key.setData(idb);
228:                DatabaseEntry value = new DatabaseEntry();
229:                value.setPartial(0, 0, true);
230:                if (c.getSearchKeyRange(key, value, LockMode.DEFAULT) == OperationStatus.SUCCESS) {
231:                    do {
232:                        if (partialMatch(idb, key.getData())) {
233:                            c.delete();
234:                        } else {
235:                            break;
236:                        }
237:                    } while (c.getNext(key, value, LockMode.DEFAULT) == OperationStatus.SUCCESS);
238:                }
239:                c.close();
240:            }
241:
242:            // long lastlog;
243:            // private void flakyLogger(String message, long start, long end) {
244:            // if (lastlog + 1000 < end) {
245:            // lastlog = end;
246:            // System.err.println(this + " : " + message + " " + (end - start) + " ms");
247:            // }
248:            // }
249:            //
250:            // private void flakyLogger(String message, long recent) {
251:            // if (lastlog + 1000 < recent) {
252:            // System.err.println(this + " : " + message);
253:            // }
254:            // }
255:
256:            private boolean partialMatch(byte[] idbytes, byte[] key) {
257:                if (key.length < idbytes.length)
258:                    return false;
259:                for (int i = 0; i < idbytes.length; i++) {
260:                    if (idbytes[i] != key[i])
261:                        return false;
262:                }
263:                return true;
264:            }
265:
266:            public boolean equals(Object other) {
267:                if (!(other instanceof  Map)) {
268:                    return false;
269:                }
270:                Map that = (Map) other;
271:                if (that.size() != this .size()) {
272:                    return false;
273:                }
274:                return entrySet().containsAll(that.entrySet());
275:            }
276:
277:            public int hashCode() {
278:                int h = 0;
279:                for (Iterator i = entrySet().iterator(); i.hasNext();) {
280:                    h += i.next().hashCode();
281:                }
282:                return h;
283:            }
284:
285:            public String toString() {
286:                return "SleepycatPersistableMap(" + id + ")={ Map.size() = "
287:                        + map.size() + ", delta.size() = " + delta.size()
288:                        + ", removeCount = " + removeCount + " }";
289:            }
290:
291:            public void load(SleepycatCollectionsPersistor persistor,
292:                    PersistenceTransaction tx, Database db) throws IOException,
293:                    ClassNotFoundException, DatabaseException {
294:                // XXX:: Since we read in one direction and since we have to read the first record of the next map to break out, we
295:                // need READ_COMMITTED to avoid deadlocks between commit thread and GC thread.
296:                Cursor c = db.openCursor(persistor.pt2nt(tx),
297:                        CursorConfig.READ_COMMITTED);
298:                byte idb[] = Conversion.long2Bytes(id);
299:                DatabaseEntry key = new DatabaseEntry();
300:                key.setData(idb);
301:                DatabaseEntry value = new DatabaseEntry();
302:                if (c.getSearchKeyRange(key, value, LockMode.DEFAULT) == OperationStatus.SUCCESS) {
303:                    do {
304:                        if (false)
305:                            System.err.println("MapDB " + toString(key) + " , "
306:                                    + toString(value));
307:                        if (partialMatch(idb, key.getData())) {
308:                            Object mkey = persistor.deserialize(idb.length, key
309:                                    .getData());
310:                            Object mvalue = persistor.deserialize(value
311:                                    .getData());
312:                            map.put(mkey, mvalue);
313:                            // System.err.println("map.put() = " + mkey + " , " + mvalue);
314:                        } else {
315:                            break;
316:                        }
317:                    } while (c.getNext(key, value, LockMode.DEFAULT) == OperationStatus.SUCCESS);
318:                }
319:                c.close();
320:            }
321:
322:            private String toString(DatabaseEntry entry) {
323:                StringBuffer sb = new StringBuffer();
324:                sb.append("<DatabaseEntry ");
325:                byte b[] = entry.getData();
326:                if (b == null) {
327:                    sb.append(" NULL Data>");
328:                } else if (b.length == 0) {
329:                    sb.append(" ZERO bytes>");
330:                } else {
331:                    for (int i = 0; i < b.length; i++) {
332:                        sb.append(b[i]).append(' ');
333:                    }
334:                    sb.append(">");
335:                }
336:                return sb.toString();
337:            }
338:
339:            private abstract class BaseView implements  Set {
340:
341:                public int size() {
342:                    return SleepycatPersistableMap.this .size();
343:                }
344:
345:                public boolean isEmpty() {
346:                    return SleepycatPersistableMap.this .isEmpty();
347:                }
348:
349:                public Object[] toArray() {
350:                    Object[] result = new Object[size()];
351:                    Iterator e = iterator();
352:                    for (int i = 0; e.hasNext(); i++)
353:                        result[i] = e.next();
354:                    return result;
355:                }
356:
357:                public Object[] toArray(Object[] a) {
358:                    int size = size();
359:                    if (a.length < size)
360:                        a = (Object[]) java.lang.reflect.Array.newInstance(a
361:                                .getClass().getComponentType(), size);
362:
363:                    Iterator it = iterator();
364:                    for (int i = 0; i < size; i++) {
365:                        a[i] = it.next();
366:                    }
367:
368:                    if (a.length > size) {
369:                        a[size] = null;
370:                    }
371:
372:                    return a;
373:                }
374:
375:                public boolean add(Object arg0) {
376:                    throw new UnsupportedOperationException();
377:                }
378:
379:                public boolean remove(Object o) {
380:                    throw new UnsupportedOperationException();
381:                }
382:
383:                public boolean containsAll(Collection collection) {
384:                    for (Iterator i = collection.iterator(); i.hasNext();) {
385:                        if (!contains(i.next())) {
386:                            return false;
387:                        }
388:                    }
389:                    return true;
390:                }
391:
392:                public boolean addAll(Collection arg0) {
393:                    throw new UnsupportedOperationException();
394:                }
395:
396:                public boolean retainAll(Collection arg0) {
397:                    throw new UnsupportedOperationException();
398:                }
399:
400:                public boolean removeAll(Collection arg0) {
401:                    throw new UnsupportedOperationException();
402:                }
403:
404:                public void clear() {
405:                    throw new UnsupportedOperationException();
406:                }
407:            }
408:
409:            private class KeyView extends BaseView {
410:
411:                public boolean contains(Object key) {
412:                    return SleepycatPersistableMap.this .containsKey(key);
413:                }
414:
415:                public Iterator iterator() {
416:                    return new KeyIterator();
417:                }
418:            }
419:
420:            private class ValuesView extends BaseView {
421:
422:                public boolean contains(Object value) {
423:                    return SleepycatPersistableMap.this .containsValue(value);
424:                }
425:
426:                public Iterator iterator() {
427:                    return new ValuesIterator();
428:                }
429:            }
430:
431:            private class EntryView extends BaseView {
432:
433:                public boolean contains(Object o) {
434:                    Map.Entry entry = (Entry) o;
435:                    Object val = get(entry.getKey());
436:                    Object entryValue = entry.getValue();
437:                    return entryValue == val
438:                            || (null != val && val.equals(entryValue));
439:                }
440:
441:                public Iterator iterator() {
442:                    return new EntryIterator();
443:                }
444:            }
445:
446:            private abstract class BaseIterator implements  Iterator {
447:
448:                boolean isDelta = false;
449:                Iterator current = map.entrySet().iterator();
450:                Map.Entry next;
451:
452:                BaseIterator() {
453:                    moveToNext();
454:                }
455:
456:                private void moveToNext() {
457:                    while (current.hasNext()) {
458:                        next = (Entry) current.next();
459:                        if (next.getValue() != REMOVED) {
460:                            return;
461:                        }
462:                    }
463:                    if (isDelta) {
464:                        next = null;
465:                    } else {
466:                        current = delta.entrySet().iterator();
467:                        isDelta = true;
468:                        moveToNext();
469:                    }
470:                }
471:
472:                public boolean hasNext() {
473:                    return (next != null);
474:                }
475:
476:                public Object next() {
477:                    Object key = getNext();
478:                    moveToNext();
479:                    return key;
480:                }
481:
482:                public void remove() {
483:                    throw new UnsupportedOperationException();
484:                }
485:
486:                protected abstract Object getNext();
487:
488:            }
489:
490:            private class KeyIterator extends BaseIterator {
491:                protected Object getNext() {
492:                    return next.getKey();
493:                }
494:            }
495:
496:            private class ValuesIterator extends BaseIterator {
497:                protected Object getNext() {
498:                    return next.getValue();
499:                }
500:            }
501:
502:            private class EntryIterator extends BaseIterator {
503:                protected Object getNext() {
504:                    return next;
505:                }
506:            }
507:        }
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