/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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);
}
}
@Override
public void activate() {
try {
_spout.activate();
} catch(AbstractMethodError ame) {
}
}
@Override
public void deactivate() {
try {
_spout.deactivate();
} catch(AbstractMethodError ame) {
}
}
}