| /** |
| * 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 com.datatorrent.lib.math; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import com.datatorrent.api.DefaultInputPort; |
| import com.datatorrent.api.DefaultOutputPort; |
| import com.datatorrent.api.StreamCodec; |
| import com.datatorrent.lib.util.BaseNumberKeyValueOperator; |
| import com.datatorrent.lib.util.HighLow; |
| import com.datatorrent.lib.util.KeyValPair; |
| import com.datatorrent.lib.util.UnifierKeyValRange; |
| |
| /** |
| * This operator emits the range for each key at the end of window. |
| * <p> |
| * <br> |
| * <b>StateFull : Yes</b>, values are computed over application window. <br> |
| * <b>Partitions : Yes, </b> high/low values are each key is unified at output port. <br> |
| * <br> |
| * <b>Ports</b>:<br> |
| * <b>data</b>: expects KeyValPair<K,V extends Number><br> |
| * <b>range</b>: emits KeyValPair<K,HighLow<V>><br> |
| * <br> |
| * <b>Properties</b>:<br> |
| * <b>inverse</b>: if set to true the key in the filter will block tuple<br> |
| * <b>filterBy</b>: List of keys to filter on<br> |
| * <br> |
| * @displayName Range Key Value |
| * @category Math |
| * @tags range, number, comparison, key value |
| * @since 0.3.3 |
| */ |
| public class RangeKeyVal<K, V extends Number> extends BaseNumberKeyValueOperator<K, V> |
| { |
| |
| /** |
| * key/high value map. |
| */ |
| protected HashMap<K, V> high = new HashMap<K, V>(); |
| |
| /** |
| * key/low value map. |
| */ |
| protected HashMap<K, V> low = new HashMap<K, V>(); |
| |
| /** |
| * Input port that takes a key value pair. |
| */ |
| public final transient DefaultInputPort<KeyValPair<K, V>> data = new DefaultInputPort<KeyValPair<K, V>>() |
| { |
| /** |
| * Process each key and computes new high and low. |
| */ |
| @Override |
| public void process(KeyValPair<K, V> tuple) |
| { |
| K key = tuple.getKey(); |
| if (!doprocessKey(key) || (tuple.getValue() == null)) { |
| return; |
| } |
| V val = low.get(key); |
| V eval = tuple.getValue(); |
| if ((val == null) || (val.doubleValue() > eval.doubleValue())) { |
| low.put(cloneKey(key), eval); |
| } |
| |
| val = high.get(key); |
| if ((val == null) || (val.doubleValue() < eval.doubleValue())) { |
| high.put(cloneKey(key), eval); |
| } |
| } |
| |
| @Override |
| public StreamCodec<KeyValPair<K, V>> getStreamCodec() |
| { |
| return getKeyValPairStreamCodec(); |
| } |
| }; |
| |
| /** |
| * Range output port to send out the high low range. |
| */ |
| public final transient DefaultOutputPort<KeyValPair<K, HighLow<V>>> range = new DefaultOutputPort<KeyValPair<K, HighLow<V>>>() |
| { |
| @Override |
| public Unifier<KeyValPair<K, HighLow<V>>> getUnifier() |
| { |
| return new UnifierKeyValRange<K,V>(); |
| } |
| }; |
| |
| /** |
| * Emits range for each key. If no data is received, no emit is done Clears |
| * the internal data before return |
| */ |
| @Override |
| public void endWindow() |
| { |
| for (Map.Entry<K, V> e : high.entrySet()) { |
| range.emit(new KeyValPair<K, HighLow<V>>(e.getKey(), new HighLow(e |
| .getValue(), low.get(e.getKey())))); |
| } |
| clearCache(); |
| } |
| |
| public void clearCache() |
| { |
| high.clear(); |
| low.clear(); |
| } |
| } |