// BaseRichSpout
@Override
public void open(Map map, TopologyContext tc, SpoutOutputCollector collector) {
super.open(map, tc, collector);
if (_harmonizerSyncedSpoutName != null && _zookeeperhost != null) {
_scHarmonizer = new SignalClient(_zookeeperhost, _harmonizerSyncedSpoutName);
_scHarmonizer.start();
}
}
// from IRichSpout interface
@Override
public void nextTuple() {
final String line = generateLine();
// Send frequency statistics & housekeeping
if (_isHarmonized && _currentHarmonizerUpdateFreq > _harmonizerUpdateThreshold) {
try {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutput out = null;
out = new ObjectOutputStream(bos);
out.writeObject(_keyFrequencies);
byte[] objectBytes = bos.toByteArray();
_scHarmonizer.send(objectBytes);
out.close();
bos.close();
} catch (Exception e) {
e.printStackTrace();
}
_keyFrequencies.clear();
_currentHarmonizerUpdateFreq = 0;
}
if (_numSentTuples >= _numOfTuplesThreshold) {
if (!_hasReachedEOF) {
_hasReachedEOF = true;
eofFinalization();
}
sendEOF();
Utils.sleep(SystemParameters.EOF_TIMEOUT_MILLIS);
return;
}
final List<String> tuple = MyUtilities.fileLineToTuple(line, getConf());
applyOperatorsAndSend(tuple);
// Update frequency statistics
if (_isHarmonized) {
updateHistogram(Integer.parseInt(tuple.get(_keyIndex)));
_currentHarmonizerUpdateFreq++;
}
}
@Override
public void close() {
super.close();
_scHarmonizer.close();
}