/**
* 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 storm.trident.planner.processor;
import backtype.storm.task.TopologyContext;
import backtype.storm.tuple.Fields;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import storm.trident.operation.MultiReducer;
import storm.trident.operation.TridentMultiReducerContext;
import storm.trident.planner.ProcessorContext;
import storm.trident.planner.TridentProcessor;
import storm.trident.tuple.TridentTuple;
import storm.trident.tuple.TridentTuple.Factory;
import storm.trident.tuple.TridentTupleView.ProjectionFactory;
public class MultiReducerProcessor implements TridentProcessor {
MultiReducer _reducer;
TridentContext _context;
Map<String, Integer> _streamToIndex;
List<Fields> _projectFields;
ProjectionFactory[] _projectionFactories;
FreshCollector _collector;
public MultiReducerProcessor(List<Fields> inputFields, MultiReducer reducer) {
_reducer = reducer;
_projectFields = inputFields;
}
@Override
public void prepare(Map conf, TopologyContext context, TridentContext tridentContext) {
List<Factory> parents = tridentContext.getParentTupleFactories();
_context = tridentContext;
_streamToIndex = new HashMap<String, Integer>();
List<String> parentStreams = tridentContext.getParentStreams();
for(int i=0; i<parentStreams.size(); i++) {
_streamToIndex.put(parentStreams.get(i), i);
}
_projectionFactories = new ProjectionFactory[_projectFields.size()];
for(int i=0; i<_projectFields.size(); i++) {
_projectionFactories[i] = new ProjectionFactory(parents.get(i), _projectFields.get(i));
}
_collector = new FreshCollector(tridentContext);
_reducer.prepare(conf, new TridentMultiReducerContext((List) Arrays.asList(_projectionFactories)));
}
@Override
public void cleanup() {
_reducer.cleanup();
}
@Override
public void startBatch(ProcessorContext processorContext) {
_collector.setContext(processorContext);
processorContext.state[_context.getStateIndex()] = _reducer.init(_collector);
}
@Override
public void execute(ProcessorContext processorContext, String streamId, TridentTuple tuple) {
_collector.setContext(processorContext);
int i = _streamToIndex.get(streamId);
_reducer.execute(processorContext.state[_context.getStateIndex()], i, _projectionFactories[i].create(tuple), _collector);
}
@Override
public void finishBatch(ProcessorContext processorContext) {
_collector.setContext(processorContext);
_reducer.complete(processorContext.state[_context.getStateIndex()], _collector);
}
@Override
public Factory getOutputFactory() {
return _collector.getOutputFactory();
}
}