package backtype.storm.clojure;
import backtype.storm.generated.StreamInfo;
import backtype.storm.spout.ISpout;
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.utils.Utils;
import clojure.lang.IFn;
import clojure.lang.PersistentArrayMap;
import clojure.lang.Keyword;
import clojure.lang.Symbol;
import clojure.lang.RT;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
public class ClojureSpout implements IRichSpout {
Map<String, StreamInfo> _fields;
List<String> _fnSpec;
List<String> _confSpec;
List<Object> _params;
ISpout _spout;
public ClojureSpout(List fnSpec, List confSpec, List<Object> params, Map<String, StreamInfo> fields) {
_fnSpec = fnSpec;
_confSpec = confSpec;
_params = params;
_fields = fields;
}
@Override
public void open(final Map conf, final TopologyContext context, final SpoutOutputCollector collector) {
IFn hof = Utils.loadClojureFn(_fnSpec.get(0), _fnSpec.get(1));
try {
IFn preparer = (IFn) hof.applyTo(RT.seq(_params));
final Map<Keyword,Object> collectorMap = new PersistentArrayMap( new Object[] {
Keyword.intern(Symbol.create("output-collector")), collector,
Keyword.intern(Symbol.create("context")), context});
List<Object> args = new ArrayList<Object>() {{
add(conf);
add(context);
add(collectorMap);
}};
_spout = (ISpout) preparer.applyTo(RT.seq(args));
//this is kind of unnecessary for clojure
try {
_spout.open(conf, context, collector);
} catch(AbstractMethodError ame) {
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
@Override
public void close() {
try {
_spout.close();
} catch(AbstractMethodError ame) {
}
}
@Override
public void nextTuple() {
try {
_spout.nextTuple();
} catch(AbstractMethodError ame) {
}
}
@Override
public void ack(Object msgId) {
try {
_spout.ack(msgId);
} catch(AbstractMethodError ame) {
}
}
@Override
public void fail(Object msgId) {
try {
_spout.fail(msgId);
} catch(AbstractMethodError ame) {
}
}
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
for(String stream: _fields.keySet()) {
StreamInfo info = _fields.get(stream);
declarer.declareStream(stream, info.is_direct(), new Fields(info.get_output_fields()));
}
}
@Override
public Map<String, Object> getComponentConfiguration() {
IFn hof = Utils.loadClojureFn(_confSpec.get(0), _confSpec.get(1));
try {
return (Map) hof.applyTo(RT.seq(_params));
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}