public void checkSlice(
String[][] values, Set<KeyColumn> removed, int key, int start, int end, int limit) {
List<Entry> entries;
if (limit <= 0)
entries =
store.getSlice(
KeyValueStoreUtil.getBuffer(key),
KeyValueStoreUtil.getBuffer(start),
KeyValueStoreUtil.getBuffer(end),
tx);
else
entries =
store.getSlice(
KeyValueStoreUtil.getBuffer(key),
KeyValueStoreUtil.getBuffer(start),
KeyValueStoreUtil.getBuffer(end),
limit,
tx);
int pos = 0;
for (int i = start; i < end; i++) {
if (removed.contains(new KeyColumn(key, i))) continue;
if (limit <= 0 || pos < limit) {
Entry entry = entries.get(pos);
int col = KeyValueStoreUtil.getID(entry.getColumn());
String str = KeyValueStoreUtil.getString(entry.getValue());
assertEquals(i, col);
assertEquals(values[key][i], str);
}
pos++;
}
assertNotNull(entries);
if (limit > 0 && pos > limit) assertEquals(limit, entries.size());
else assertEquals(pos, entries.size());
}
private List<Entry> appendResults(
ByteBuffer key,
ByteBuffer columnStart,
ByteBuffer columnEnd,
List<Entry> entries,
LimitTracker limit,
TransactionHandle txh) {
if (limit.limitExhausted()) return null;
List<Entry> results = null;
for (int readAttempt = 0; readAttempt < maxReadRetryAttempts; readAttempt++) {
try {
results = edgeStore.getSlice(key, columnStart, columnEnd, limit.getLimit(), txh);
break;
} catch (StorageException e) {
if (e instanceof TemporaryStorageException) {
if (readAttempt < maxReadRetryAttempts - 1) temporaryStorageException(e);
else throw readException(e, maxReadRetryAttempts);
} else throw readException(e);
}
}
limit.retrieved(results.size());
if (entries == null) return results;
else {
entries.addAll(results);
return entries;
}
}
@Test
public void getSliceRespectsAllBoundsInclusionArguments() throws Exception {
// Test case where endColumn=startColumn+1
ByteBuffer key = KeyColumnValueStoreUtil.longToByteBuffer(0);
ByteBuffer columnBeforeStart = KeyColumnValueStoreUtil.longToByteBuffer(776);
ByteBuffer columnStart = KeyColumnValueStoreUtil.longToByteBuffer(777);
ByteBuffer columnEnd = KeyColumnValueStoreUtil.longToByteBuffer(778);
ByteBuffer columnAfterEnd = KeyColumnValueStoreUtil.longToByteBuffer(779);
// First insert four test Entries
TransactionHandle txn = manager.beginTransaction();
List<Entry> entries =
Arrays.asList(
new Entry(columnBeforeStart, columnBeforeStart),
new Entry(columnStart, columnStart),
new Entry(columnEnd, columnEnd),
new Entry(columnAfterEnd, columnAfterEnd));
store.mutate(key, entries, null, txn);
txn.commit();
// getSlice() with only start inclusive
txn = manager.beginTransaction();
List<Entry> result = store.getSlice(key, columnStart, columnEnd, txn);
assertEquals(1, result.size());
assertEquals(777, result.get(0).getColumn().getLong());
txn.commit();
}
@Test
public void getSliceRespectsColumnLimit() throws Exception {
TransactionHandle txn = manager.beginTransaction();
ByteBuffer key = KeyColumnValueStoreUtil.longToByteBuffer(0);
final int cols = 1024;
List<Entry> entries = new LinkedList<Entry>();
for (int i = 0; i < cols; i++) {
ByteBuffer col = KeyColumnValueStoreUtil.longToByteBuffer(i);
entries.add(new Entry(col, col));
}
store.mutate(key, entries, null, txn);
txn.commit();
txn = manager.beginTransaction();
ByteBuffer columnStart = KeyColumnValueStoreUtil.longToByteBuffer(0);
ByteBuffer columnEnd = KeyColumnValueStoreUtil.longToByteBuffer(cols);
/*
* When limit is greater than or equal to the matching column count,
* all matching columns must be returned.
*/
List<Entry> result = store.getSlice(key, columnStart, columnEnd, cols, txn);
assertEquals(cols, result.size());
assertEquals(entries, result);
result = store.getSlice(key, columnStart, columnEnd, cols + 10, txn);
assertEquals(cols, result.size());
assertEquals(entries, result);
/*
* When limit is less the matching column count, the columns up to the
* limit (ordered bytewise) must be returned.
*/
result = store.getSlice(key, columnStart, columnEnd, cols - 1, txn);
assertEquals(cols - 1, result.size());
entries.remove(entries.size() - 1);
assertEquals(entries, result);
result = store.getSlice(key, columnStart, columnEnd, 1, txn);
assertEquals(1, result.size());
List<Entry> firstEntrySingleton = Arrays.asList(entries.get(0));
assertEquals(firstEntrySingleton, result);
txn.commit();
}
@Override
public long[] indexRetrieval(Object key, TitanKey pt, InternalTitanTransaction tx) {
Preconditions.checkArgument(
pt.isSimple(), "Currently, only simple properties are supported for index retrieval");
Preconditions.checkArgument(
pt.hasIndex(), "Cannot retrieve for given property key - it does not have an index");
long[] vertices = null;
Preconditions.checkArgument(
pt.getDataType().isInstance(key),
"Specified object is incompatible with property data type [" + pt.getName() + "]");
for (int readAttempt = 0; readAttempt < maxReadRetryAttempts; readAttempt++) {
try {
if (pt.isUnique()) {
ByteBuffer value =
propertyIndex.get(getIndexKey(key), getKeyedIndexColumn(pt), tx.getTxHandle());
if (value != null) {
vertices = new long[1];
vertices[0] = VariableLong.readPositive(value);
}
} else {
ByteBuffer startColumn = VariableLong.positiveByteBuffer(pt.getID());
List<Entry> entries =
propertyIndex.getSlice(
getIndexKey(key),
startColumn,
ByteBufferUtil.nextBiggerBuffer(startColumn),
tx.getTxHandle());
vertices = new long[entries.size()];
int i = 0;
for (Entry ent : entries) {
vertices[i++] = VariableLong.readPositive(ent.getValue());
}
}
break;
} catch (StorageException e) {
if (e instanceof TemporaryStorageException) {
if (readAttempt < maxReadRetryAttempts - 1) temporaryStorageException(e);
else throw readException(e, maxReadRetryAttempts);
} else throw readException(e);
}
}
if (vertices == null) return new long[0];
else return vertices;
}