package storm.trident.spout;
import backtype.storm.coordination.BatchOutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.FailedException;
import backtype.storm.topology.OutputFieldsDeclarer;
import storm.trident.topology.TransactionAttempt;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import org.apache.log4j.Logger;
import storm.trident.operation.TridentCollector;
import storm.trident.topology.BatchInfo;
import storm.trident.topology.ITridentBatchBolt;
import storm.trident.topology.MasterBatchCoordinator;
import storm.trident.tuple.ConsList;
public class TridentSpoutExecutor implements ITridentBatchBolt {
public static String ID_FIELD = "$tx";
public static Logger LOG = Logger.getLogger(TridentSpoutExecutor.class);
AddIdCollector _collector;
ITridentSpout _spout;
ITridentSpout.Emitter _emitter;
String _streamName;
String _txStateId;
TreeMap<Long, TransactionAttempt> _activeBatches = new TreeMap<Long, TransactionAttempt>();
public TridentSpoutExecutor(String txStateId, String streamName, ITridentSpout spout) {
_txStateId = txStateId;
_spout = spout;
_streamName = streamName;
}
@Override
public void prepare(Map conf, TopologyContext context, BatchOutputCollector collector) {
_emitter = _spout.getEmitter(_txStateId, conf, context);
_collector = new AddIdCollector(_streamName, collector);
}
@Override
public void execute(BatchInfo info, Tuple input) {
// there won't be a BatchInfo for the success stream
TransactionAttempt attempt = (TransactionAttempt) input.getValue(0);
if(input.getSourceStreamId().equals(MasterBatchCoordinator.COMMIT_STREAM_ID)) {
if(attempt.equals(_activeBatches.get(attempt.getTransactionId()))) {
((ICommitterTridentSpout.Emitter) _emitter).commit(attempt);
_activeBatches.remove(attempt.getTransactionId());
} else {
throw new FailedException("Received commit for different transaction attempt");
}
} else if(input.getSourceStreamId().equals(MasterBatchCoordinator.SUCCESS_STREAM_ID)) {
// valid to delete before what's been committed since
// those batches will never be accessed again
_activeBatches.headMap(attempt.getTransactionId()).clear();
_emitter.success(attempt);
} else {
_collector.setBatch(info.batchId);
_emitter.emitBatch(attempt, input.getValue(1), _collector);
_activeBatches.put(attempt.getTransactionId(), attempt);
}
}
@Override
public void cleanup() {
_emitter.close();
}
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
List<String> fields = new ArrayList(_spout.getOutputFields().toList());
fields.add(0, ID_FIELD);
declarer.declareStream(_streamName, new Fields(fields));
}
@Override
public Map<String, Object> getComponentConfiguration() {
return _spout.getComponentConfiguration();
}
@Override
public void finishBatch(BatchInfo batchInfo) {
}
@Override
public Object initBatchState(String batchGroup, Object batchId) {
return null;
}
private static class AddIdCollector implements TridentCollector {
BatchOutputCollector _delegate;
Object _id;
String _stream;
public AddIdCollector(String stream, BatchOutputCollector c) {
_delegate = c;
_stream = stream;
}
public void setBatch(Object id) {
_id = id;
}
@Override
public void emit(List<Object> values) {
_delegate.emit(_stream, new ConsList(_id, values));
}
@Override
public void reportError(Throwable t) {
_delegate.reportError(t);
}
}
}