public void testBackwardIteration() throws IOException {
final int records = 10000;
long seed = System.currentTimeMillis();
MersenneTwisterFast mersenneTwisterFast = new MersenneTwisterFast(1381162033616L);
System.out.println("testBackwardIteration seed : " + seed);
NavigableMap<OClusterPosition, byte[]> positionRecordMap = new TreeMap<OClusterPosition, byte[]>();
ORecordVersion recordVersion = OVersionFactory.instance().createVersion();
recordVersion.increment();
recordVersion.increment();
for (int i = 0; i < records; i++) {
int recordSize = mersenneTwisterFast.nextInt(2 * OClusterPage.MAX_RECORD_SIZE) + 1;
byte[] record = new byte[recordSize];
mersenneTwisterFast.nextBytes(record);
final OPhysicalPosition physicalPosition = paginatedCluster.createRecord(record, recordVersion, (byte) 2);
positionRecordMap.put(physicalPosition.clusterPosition, record);
}
Iterator<OClusterPosition> positionIterator = positionRecordMap.keySet().iterator();
while (positionIterator.hasNext()) {
OClusterPosition clusterPosition = positionIterator.next();
if (mersenneTwisterFast.nextBoolean()) {
Assert.assertTrue(paginatedCluster.deleteRecord(clusterPosition));
positionIterator.remove();
}
}
OPhysicalPosition physicalPosition = new OPhysicalPosition();
physicalPosition.clusterPosition = OClusterPositionFactory.INSTANCE.valueOf(Long.MAX_VALUE);
OPhysicalPosition[] positions = paginatedCluster.floorPositions(physicalPosition);
Assert.assertTrue(positions.length > 0);
positionIterator = positionRecordMap.descendingKeySet().iterator();
int counter = 0;
while (positionIterator.hasNext()) {
Assert.assertTrue(positions.length > 0);
OClusterPosition testedPosition = positionIterator.next();
Assert.assertEquals(positions[positions.length - 1].clusterPosition, testedPosition);
OPhysicalPosition positionToFind = positions[positions.length - 1];
positions = paginatedCluster.lowerPositions(positionToFind);
counter++;
}
Assert.assertEquals(paginatedCluster.getEntries(), counter);
Assert.assertEquals(paginatedCluster.getFirstPosition(), positionRecordMap.firstKey());
Assert.assertEquals(paginatedCluster.getLastPosition(), positionRecordMap.lastKey());
}
@Test
public void NoSuchElem_After_Clear() {
// bug reported by : Lazaros Tsochatzidis
// But after clearing the tree using:
//
// public void Delete() {
// db.getTreeMap("Names").clear();
// db.compact();
// }
//
// every next call of getLastKey() leads to the exception "NoSuchElement". Not
// only the first one...
DB db = DBMaker.memoryDB().transactionDisable().make();
NavigableMap m = db.treeMap("name");
try {
m.lastKey();
fail();
} catch (NoSuchElementException e) {
}
m.put("aa", "aa");
assertEquals("aa", m.lastKey());
m.put("bb", "bb");
assertEquals("bb", m.lastKey());
db.treeMap("name").clear();
db.compact();
try {
Object key = m.lastKey();
fail(key.toString());
} catch (NoSuchElementException e) {
}
m.put("aa", "aa");
assertEquals("aa", m.lastKey());
m.put("bb", "bb");
assertEquals("bb", m.lastKey());
}
/**
* Answers the last element in this TreeSet.
*
* @return the last element
* @exception NoSuchElementException when this TreeSet is empty
*/
public E last() {
return backingMap.lastKey();
}
/** @throws NoSuchElementException {@inheritDoc} */
public E last() {
return m.lastKey();
}
