| /** |
| * 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 org.apache.commons.lang.mutable.MutableDouble; |
| |
| 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.KeyValPair; |
| |
| /** |
| * |
| * This operator adds all values for each key in "numerator" and "denominator", and emits the margin for each key at the end of window. |
| * <p> |
| * <br> |
| * Margin Formula used by this operator: 1 - numerator/denominator. |
| * The values are added for each key within the window and for each stream.<br> |
| * <br> |
| * <b>Ports</b>:<br> |
| * <b>numerator</b>: expects KeyValPair<K,V><br> |
| * <b>denominator</b>: expects KeyValPair<K,V><br> |
| * <b>margin</b>: emits HashMap<K,Double>, one entry per key per window<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 Margin Key Value |
| * @category Math |
| * @tags sum, division, numeric, key value |
| * @since 0.3.3 |
| */ |
| public class MarginKeyVal<K, V extends Number> extends BaseNumberKeyValueOperator<K, V> |
| { |
| /** |
| * Numerator input port that takes a key value pair. |
| */ |
| public final transient DefaultInputPort<KeyValPair<K, V>> numerator = new DefaultInputPort<KeyValPair<K, V>>() |
| { |
| /** |
| * Adds tuple to the numerator hash. |
| */ |
| @Override |
| public void process(KeyValPair<K, V> tuple) |
| { |
| addTuple(tuple, numerators); |
| } |
| |
| /** |
| * Set StreamCodec used for partitioning. |
| */ |
| @Override |
| public StreamCodec<KeyValPair<K, V>> getStreamCodec() |
| { |
| return getKeyValPairStreamCodec(); |
| } |
| }; |
| |
| /** |
| * Denominator input port that takes a key value pair. |
| */ |
| public final transient DefaultInputPort<KeyValPair<K, V>> denominator = new DefaultInputPort<KeyValPair<K, V>>() |
| { |
| /** |
| * Adds tuple to the denominator hash. |
| */ |
| @Override |
| public void process(KeyValPair<K, V> tuple) |
| { |
| addTuple(tuple, denominators); |
| } |
| |
| /** |
| * Set StreamCodec used for partitioning. |
| */ |
| @Override |
| public StreamCodec<KeyValPair<K, V>> getStreamCodec() |
| { |
| return getKeyValPairStreamCodec(); |
| } |
| }; |
| |
| /** |
| * Adds the value for each key. |
| * |
| * @param tuple |
| * @param map |
| */ |
| public void addTuple(KeyValPair<K, V> tuple, Map<K, MutableDouble> map) |
| { |
| K key = tuple.getKey(); |
| if (!doprocessKey(key) || (tuple.getValue() == null)) { |
| return; |
| } |
| MutableDouble val = map.get(key); |
| if (val == null) { |
| val = new MutableDouble(0.0); |
| map.put(cloneKey(key), val); |
| } |
| val.add(tuple.getValue().doubleValue()); |
| } |
| |
| /** |
| * Output margin port that emits Key Value pairs. |
| */ |
| public final transient DefaultOutputPort<KeyValPair<K, V>> margin = new DefaultOutputPort<KeyValPair<K, V>>(); |
| |
| protected HashMap<K, MutableDouble> numerators = new HashMap<K, MutableDouble>(); |
| protected HashMap<K, MutableDouble> denominators = new HashMap<K, MutableDouble>(); |
| protected boolean percent = false; |
| |
| /** |
| * getter function for percent |
| * |
| * @return percent |
| */ |
| public boolean getPercent() |
| { |
| return percent; |
| } |
| |
| /** |
| * setter function for percent |
| * |
| * @param val |
| * sets percent |
| */ |
| public void setPercent(boolean val) |
| { |
| percent = val; |
| } |
| |
| /** |
| * Generates tuples for each key and emits them. Only keys that are in the |
| * denominator are iterated on If the key is only in the numerator, it gets |
| * ignored (cannot do divide by 0) Clears internal data |
| */ |
| @SuppressWarnings({ "rawtypes", "unchecked" }) |
| @Override |
| public void endWindow() |
| { |
| Double val; |
| for (Map.Entry<K, MutableDouble> e : denominators.entrySet()) { |
| K key = e.getKey(); |
| MutableDouble nval = numerators.get(key); |
| if (nval == null) { |
| nval = new MutableDouble(0.0); |
| } else { |
| numerators.remove(key); // so that all left over keys can be reported |
| } |
| if (percent) { |
| val = (1 - nval.doubleValue() / e.getValue().doubleValue()) * 100; |
| } else { |
| val = 1 - nval.doubleValue() / e.getValue().doubleValue(); |
| } |
| |
| margin.emit(new KeyValPair(key, getValue(val.doubleValue()))); |
| } |
| |
| numerators.clear(); |
| denominators.clear(); |
| } |
| } |