package storm.trident.spout;
import backtype.storm.Config;
import backtype.storm.generated.Grouping;
import backtype.storm.spout.ISpoutOutputCollector;
import backtype.storm.spout.SpoutOutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.IRichSpout;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Values;
import backtype.storm.utils.Utils;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.Set;
import storm.trident.topology.TridentBoltExecutor;
import storm.trident.tuple.ConsList;
import storm.trident.util.TridentUtils;
public class RichSpoutBatchTriggerer implements IRichSpout {
String _stream;
IRichSpout _delegate;
List<Integer> _outputTasks;
Random _rand;
String _coordStream;
public RichSpoutBatchTriggerer(IRichSpout delegate, String streamName, String batchGroup) {
_delegate = delegate;
_stream = streamName;
_coordStream = TridentBoltExecutor.COORD_STREAM(batchGroup);
}
@Override
public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
_delegate.open(conf, context, new SpoutOutputCollector(new StreamOverrideCollector(collector)));
_outputTasks = new ArrayList<Integer>();
for(String component: Utils.get(context.getThisTargets(),
_coordStream,
new HashMap<String, Grouping>()).keySet()) {
_outputTasks.addAll(context.getComponentTasks(component));
}
_rand = new Random(Utils.secureRandomLong());
}
@Override
public void close() {
_delegate.close();
}
@Override
public void activate() {
_delegate.activate();
}
@Override
public void deactivate() {
_delegate.deactivate();
}
@Override
public void nextTuple() {
_delegate.nextTuple();
}
@Override
public void ack(Object msgId) {
Long batchId = _msgIdToBatchId.remove((Long) msgId);
FinishCondition cond = _finishConditions.get(batchId);
if(cond!=null) {
cond.vals.remove((Long) msgId);
if(cond.vals.isEmpty()) {
_finishConditions.remove(batchId);
_delegate.ack(cond.msgId);
}
}
}
@Override
public void fail(Object msgId) {
Long batchId = _msgIdToBatchId.remove((Long) msgId);
FinishCondition cond = _finishConditions.remove(batchId);
if(cond!=null) {
_delegate.fail(cond.msgId);
}
}
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
Fields outFields = TridentUtils.getSingleOutputStreamFields(_delegate);
outFields = TridentUtils.fieldsConcat(new Fields("$id$"), outFields);
declarer.declareStream(_stream, outFields);
// try to find a way to merge this code with what's already done in TridentBoltExecutor
declarer.declareStream(_coordStream, true, new Fields("id", "count"));
}
@Override
public Map<String, Object> getComponentConfiguration() {
Map<String, Object> conf = _delegate.getComponentConfiguration();
if(conf==null) conf = new HashMap();
else conf = new HashMap(conf);
Config.registerSerialization(conf, RichSpoutBatchId.class, RichSpoutBatchIdSerializer.class);
return conf;
}
static class FinishCondition {
Set<Long> vals = new HashSet<Long>();
Object msgId;
}
Map<Long, Long> _msgIdToBatchId = new HashMap();
Map<Long, FinishCondition> _finishConditions = new HashMap();
class StreamOverrideCollector implements ISpoutOutputCollector {
SpoutOutputCollector _collector;
public StreamOverrideCollector(SpoutOutputCollector collector) {
_collector = collector;
}
@Override
public List<Integer> emit(String ignore, List<Object> values, Object msgId) {
long batchIdVal = _rand.nextLong();
Object batchId = new RichSpoutBatchId(batchIdVal);
FinishCondition finish = new FinishCondition();
finish.msgId = msgId;
List<Integer> tasks = _collector.emit(_stream, new ConsList(batchId, values));
Set<Integer> outTasksSet = new HashSet<Integer>(tasks);
for(Integer t: _outputTasks) {
int count = 0;
if(outTasksSet.contains(t)) {
count = 1;
}
long r = _rand.nextLong();
_collector.emitDirect(t, _coordStream, new Values(batchId, count), r);
finish.vals.add(r);
_msgIdToBatchId.put(r, batchIdVal);
}
_finishConditions.put(batchIdVal, finish);
return tasks;
}
@Override
public void emitDirect(int task, String ignore, List<Object> values, Object msgId) {
throw new RuntimeException("Trident does not support direct emits from spouts");
}
@Override
public void reportError(Throwable t) {
_collector.reportError(t);
}
}
}