/**
* 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.Map;
import storm.trident.planner.ProcessorContext;
import storm.trident.planner.TridentProcessor;
import storm.trident.planner.TupleReceiver;
import storm.trident.tuple.TridentTuple;
import storm.trident.tuple.TridentTuple.Factory;
import storm.trident.tuple.TridentTupleView.ProjectionFactory;
public class ProjectedProcessor implements TridentProcessor {
Fields _projectFields;
ProjectionFactory _factory;
TridentContext _context;
public ProjectedProcessor(Fields projectFields) {
_projectFields = projectFields;
}
@Override
public void prepare(Map conf, TopologyContext context, TridentContext tridentContext) {
if(tridentContext.getParentTupleFactories().size()!=1) {
throw new RuntimeException("Projection processor can only have one parent");
}
_context = tridentContext;
_factory = new ProjectionFactory(tridentContext.getParentTupleFactories().get(0), _projectFields);
}
@Override
public void cleanup() {
}
@Override
public void startBatch(ProcessorContext processorContext) {
}
@Override
public void execute(ProcessorContext processorContext, String streamId, TridentTuple tuple) {
TridentTuple toEmit = _factory.create(tuple);
for(TupleReceiver r: _context.getReceivers()) {
r.execute(processorContext, _context.getOutStreamId(), toEmit);
}
}
@Override
public void finishBatch(ProcessorContext processorContext) {
}
@Override
public Factory getOutputFactory() {
return _factory;
}
}