/**
* Convert Titan internal Mutation representation into HBase native commands.
*
* @param mutations Mutations to convert into HBase commands.
* @param putTimestamp The timestamp to use for Put commands.
* @param delTimestamp The timestamp to use for Delete commands.
* @return Commands sorted by key converted from Titan internal representation.
*/
private static Map<ByteBuffer, Pair<Put, Delete>> convertToCommands(
Map<String, Map<ByteBuffer, KCVMutation>> mutations,
final long putTimestamp,
final long delTimestamp) {
Map<ByteBuffer, Pair<Put, Delete>> commandsPerKey =
new HashMap<ByteBuffer, Pair<Put, Delete>>();
for (Map.Entry<String, Map<ByteBuffer, KCVMutation>> entry : mutations.entrySet()) {
byte[] cfName = entry.getKey().getBytes();
for (Map.Entry<ByteBuffer, KCVMutation> m : entry.getValue().entrySet()) {
ByteBuffer key = m.getKey();
KCVMutation mutation = m.getValue();
Pair<Put, Delete> commands = commandsPerKey.get(key);
if (commands == null) {
commands = new Pair<Put, Delete>();
commandsPerKey.put(key, commands);
}
if (mutation.hasDeletions()) {
if (commands.getSecond() == null)
commands.setSecond(new Delete(ByteBufferUtil.getArray(key), delTimestamp, null));
for (ByteBuffer b : mutation.getDeletions()) {
commands.getSecond().deleteColumns(cfName, ByteBufferUtil.getArray(b), delTimestamp);
}
}
if (mutation.hasAdditions()) {
if (commands.getFirst() == null)
commands.setFirst(new Put(ByteBufferUtil.getArray(key), putTimestamp));
for (Entry e : mutation.getAdditions()) {
commands
.getFirst()
.add(
cfName,
ByteBufferUtil.getArray(e.getColumn()),
putTimestamp,
ByteBufferUtil.getArray(e.getValue()));
}
}
}
}
return commandsPerKey;
}
private List<Entry> appendResults(
ByteBuffer key,
ByteBuffer columnPrefix,
List<Entry> entries,
LimitTracker limit,
TransactionHandle txh) {
return appendResults(
key, columnPrefix, ByteBufferUtil.nextBiggerBuffer(columnPrefix), entries, limit, txh);
}
@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;
}
private List<Entry> queryForEntries(AtomicQuery query, TransactionHandle txh) {
ByteBuffer key = IDHandler.getKey(query.getVertexID());
List<Entry> entries = null;
LimitTracker limit = new LimitTracker(query);
boolean dirs[] = getAllowedDirections(query);
if (query.hasEdgeTypeCondition()) {
TitanType et = query.getTypeCondition();
if (!et.isNew()) { // Result set must be empty if TitanType is new
ArrayList<Object> applicableConstraints = null;
boolean isRange = false;
if (query.hasConstraints()) {
assert !et.isSimple();
TypeDefinition def = ((InternalTitanType) et).getDefinition();
String[] keysig = def.getKeySignature();
applicableConstraints = new ArrayList<Object>(keysig.length);
Map<String, Object> constraints = query.getConstraints();
for (int i = 0; i < keysig.length; i++) {
if (constraints.containsKey(keysig[i])) {
Object iv = constraints.get(keysig[i]);
applicableConstraints.add(iv);
if (iv != null && (iv instanceof AtomicInterval) && ((AtomicInterval) iv).isRange()) {
isRange = true;
break;
}
} else break;
}
if (applicableConstraints.isEmpty()) applicableConstraints = null;
}
for (int dirID = 0; dirID < 4; dirID++) {
if (dirs[dirID]) {
if (applicableConstraints != null) {
assert !applicableConstraints.isEmpty();
DataOutput start = serializer.getDataOutput(defaultOutputCapacity, true);
DataOutput end = null;
if (isRange) end = serializer.getDataOutput(defaultOutputCapacity, true);
IDHandler.writeEdgeType(start, et.getID(), dirID, idManager);
if (isRange) IDHandler.writeEdgeType(end, et.getID(), dirID, idManager);
// Write all applicable key constraints
for (Object iv : applicableConstraints) {
if (iv instanceof AtomicInterval) {
AtomicInterval interval = (AtomicInterval) iv;
if (interval.isPoint()) {
start.writeObject(interval.getStartPoint());
if (isRange) end.writeObject(interval.getStartPoint());
} else {
assert isRange;
assert interval.isRange();
ByteBuffer startColumn, endColumn;
if (interval.getStartPoint() != null) {
start.writeObject(interval.getStartPoint());
startColumn = start.getByteBuffer();
if (!interval.startInclusive())
startColumn = ByteBufferUtil.nextBiggerBuffer(startColumn);
} else {
assert interval.startInclusive();
startColumn = start.getByteBuffer();
}
if (interval.getEndPoint() != null) {
end.writeObject(interval.getEndPoint());
} else {
assert interval.endInclusive();
}
endColumn = end.getByteBuffer();
if (interval.endInclusive())
endColumn = ByteBufferUtil.nextBiggerBuffer(endColumn);
entries = appendResults(key, startColumn, endColumn, entries, limit, txh);
break; // redundant, this must be the last iteration because its a range
}
} else {
assert iv == null || (iv instanceof TitanVertex);
long id = 0;
if (iv != null) id = ((TitanVertex) iv).getID();
VariableLong.writePositive(start, id);
if (isRange) VariableLong.writePositive(end, id);
}
}
if (!isRange)
entries = appendResults(key, start.getByteBuffer(), entries, limit, txh);
} else {
ByteBuffer columnStart = IDHandler.getEdgeType(et.getID(), dirID, idManager);
entries = appendResults(key, columnStart, entries, limit, txh);
}
}
}
}
} else if (query.hasGroupCondition()) {
int groupid = query.getGroupCondition().getID();
for (int dirID = 0; dirID < 4; dirID++) {
if (dirs[dirID]) {
ByteBuffer columnStart = IDHandler.getEdgeTypeGroup(groupid, dirID, idManager);
entries = appendResults(key, columnStart, entries, limit, txh);
}
}
} else {
int lastDirID = -1;
for (int dirID = 0; dirID <= 4; dirID++) {
if ((dirID >= 4 || !dirs[dirID]) && lastDirID >= 0) {
ByteBuffer columnStart = IDHandler.getEdgeTypeGroup(0, lastDirID, idManager);
ByteBuffer columnEnd =
IDHandler.getEdgeTypeGroup(idManager.getMaxGroupID() + 1, dirID - 1, idManager);
entries = appendResults(key, columnStart, columnEnd, entries, limit, txh);
lastDirID = -1;
}
if (dirID < 4) {
if (dirs[dirID] && lastDirID == -1) lastDirID = dirID;
}
}
}
if (entries == null) return ImmutableList.of();
else return entries;
}