/** * Partially roll back the current transaction. * * @param savepoint the savepoint to which should be rolled back * @param trimToSize if the list should be trimmed */ public void rollbackTo(Savepoint savepoint, boolean trimToSize) { int index = savepoint == null ? 0 : savepoint.logIndex; while (undoLog.size() > index) { UndoLogRecord entry = undoLog.getLast(); entry.undo(this); undoLog.removeLast(trimToSize); } if (transaction != null) { long savepointId = savepoint == null ? 0 : savepoint.transactionSavepoint; HashMap<String, MVTable> tableMap = database.getMvStore().getTables(); Iterator<Change> it = transaction.getChanges(savepointId); while (it.hasNext()) { Change c = it.next(); MVTable t = tableMap.get(c.mapName); if (t != null) { long key = ((ValueLong) c.key).getLong(); ValueArray value = (ValueArray) c.value; short op; Row row; if (value == null) { op = UndoLogRecord.INSERT; row = t.getRow(this, key); } else { op = UndoLogRecord.DELETE; row = new Row(value.getList(), Row.MEMORY_CALCULATE); } row.setKey(key); UndoLogRecord log = new UndoLogRecord(t, op, row); log.undo(this); } } } if (savepoints != null) { String[] names = new String[savepoints.size()]; savepoints.keySet().toArray(names); for (String name : names) { Savepoint sp = savepoints.get(name); int savepointIndex = sp.logIndex; if (savepointIndex > index) { savepoints.remove(name); } } } }
private void testGetModifiedMaps() { MVStore s = MVStore.open(null); TransactionStore ts = new TransactionStore(s); Transaction tx; TransactionMap<String, String> m1, m2, m3; long sp; tx = ts.begin(); m1 = tx.openMap("m1"); m2 = tx.openMap("m2"); m3 = tx.openMap("m3"); assertFalse(tx.getChanges(0).hasNext()); tx.commit(); tx = ts.begin(); m1 = tx.openMap("m1"); m2 = tx.openMap("m2"); m3 = tx.openMap("m3"); m1.put("1", "100"); sp = tx.setSavepoint(); m2.put("1", "100"); m3.put("1", "100"); Iterator<Change> it = tx.getChanges(sp); assertTrue(it.hasNext()); Change c; c = it.next(); assertEquals("m3", c.mapName); assertEquals("1", c.key.toString()); assertNull(c.value); assertTrue(it.hasNext()); c = it.next(); assertEquals("m2", c.mapName); assertEquals("1", c.key.toString()); assertNull(c.value); assertFalse(it.hasNext()); it = tx.getChanges(0); assertTrue(it.hasNext()); c = it.next(); assertEquals("m3", c.mapName); assertEquals("1", c.key.toString()); assertNull(c.value); assertTrue(it.hasNext()); c = it.next(); assertEquals("m2", c.mapName); assertEquals("1", c.key.toString()); assertNull(c.value); assertTrue(it.hasNext()); c = it.next(); assertEquals("m1", c.mapName); assertEquals("1", c.key.toString()); assertNull(c.value); assertFalse(it.hasNext()); tx.rollbackToSavepoint(sp); it = tx.getChanges(0); assertTrue(it.hasNext()); c = it.next(); assertEquals("m1", c.mapName); assertEquals("1", c.key.toString()); assertNull(c.value); assertFalse(it.hasNext()); tx.commit(); s.close(); }