| /* |
| * Copyright (c) 2013 DataTorrent, Inc. ALL Rights Reserved. |
| * |
| * Licensed 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 com.datatorrent.lib.util; |
| |
| import com.datatorrent.api.DefaultOutputPort; |
| import com.datatorrent.api.Context.OperatorContext; |
| import com.datatorrent.api.Operator.Unifier; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * |
| * Combiner for an output port that emits object with Map<K,ArrayList<V>(2)> interface and has the processing done |
| * with round robin partition. The first element in the ArrayList is high, the next is low |
| * |
| * @since 0.3.2 |
| */ |
| public class UnifierHashMapRange<K, V extends Number> implements Unifier<HashMap<K, HighLow<V>>> |
| { |
| public HashMap<K, HighLow<V>> mergedTuple = new HashMap<K, HighLow<V>>(); |
| public final transient DefaultOutputPort<HashMap<K, HighLow<V>>> mergedport = new DefaultOutputPort<HashMap<K, HighLow<V>>>(); |
| |
| /** |
| * combines the tuple into a single final tuple which is emitted in endWindow |
| * @param tuple incoming tuple from a partition |
| */ |
| @Override |
| public void process(HashMap<K, HighLow<V>> tuple) |
| { |
| for (Map.Entry<K, HighLow<V>> e: tuple.entrySet()) { |
| HighLow<V> val = mergedTuple.get(e.getKey()); |
| if (val == null) { |
| val = new HighLow(e.getValue().getHigh(), e.getValue().getLow()); |
| mergedTuple.put(e.getKey(), val); |
| } |
| else { |
| if (val.getHigh().doubleValue() < e.getValue().getHigh().doubleValue()) { |
| val.setHigh(e.getValue().getHigh()); |
| } |
| if (val.getLow().doubleValue() > e.getValue().getLow().doubleValue()) { |
| val.setLow(e.getValue().getLow()); |
| } |
| } |
| } |
| } |
| |
| /** |
| * a no op |
| * @param windowId |
| */ |
| @Override |
| public void beginWindow(long windowId) |
| { |
| } |
| |
| |
| /** |
| * emits mergedTuple on mergedport if it is not empty |
| */ |
| @Override |
| public void endWindow() |
| { |
| if (!mergedTuple.isEmpty()) { |
| mergedport.emit(mergedTuple); |
| mergedTuple = new HashMap<K, HighLow<V>>(); |
| } |
| } |
| |
| /** |
| * a no-op |
| * @param context |
| */ |
| @Override |
| public void setup(OperatorContext context) |
| { |
| } |
| |
| /** |
| * a noop |
| */ |
| @Override |
| public void teardown() |
| { |
| } |
| } |