| /** |
| * 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 org.apache.apex.malhar.lib.window.accumulation; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| import org.apache.apex.malhar.lib.window.Tuple; |
| import com.datatorrent.api.DefaultInputPort; |
| import com.datatorrent.api.DefaultOutputPort; |
| import com.datatorrent.api.InputOperator; |
| import com.datatorrent.common.util.BaseOperator; |
| |
| /** |
| * Test for {@link ReduceFn}. |
| */ |
| public class FoldFnTest |
| { |
| public static class NumGen extends BaseOperator implements InputOperator |
| { |
| public transient DefaultOutputPort<Integer> output = new DefaultOutputPort<>(); |
| |
| public static int count = 0; |
| private int i = 0; |
| |
| public NumGen() |
| { |
| count = 0; |
| i = 0; |
| } |
| |
| @Override |
| public void emitTuples() |
| { |
| while (i <= 7) { |
| try { |
| Thread.sleep(50); |
| } catch (InterruptedException e) { |
| // Ignore it. |
| } |
| count++; |
| if (i >= 0) { |
| output.emit(i++); |
| } |
| } |
| i = -1; |
| } |
| } |
| |
| public static class Collector extends BaseOperator |
| { |
| private static int result; |
| |
| public transient DefaultInputPort<Tuple.WindowedTuple<Integer>> input = new DefaultInputPort<Tuple.WindowedTuple<Integer>>() |
| { |
| @Override |
| public void process(Tuple.WindowedTuple<Integer> tuple) |
| { |
| result = tuple.getValue(); |
| } |
| }; |
| |
| public int getResult() |
| { |
| return result; |
| } |
| } |
| |
| public static class Plus extends FoldFn<Integer, Integer> |
| { |
| @Override |
| public Integer merge(Integer accumulatedValue1, Integer accumulatedValue2) |
| { |
| return fold(accumulatedValue1, accumulatedValue2); |
| } |
| |
| @Override |
| public Integer fold(Integer input1, Integer input2) |
| { |
| if (input1 == null) { |
| return input2; |
| } |
| return input1 + input2; |
| } |
| } |
| |
| @Test |
| public void FoldFnTest() |
| { |
| |
| FoldFn<String, String> concat = new FoldFn<String, String>() |
| { |
| @Override |
| public String merge(String accumulatedValue1, String accumulatedValue2) |
| { |
| return fold(accumulatedValue1, accumulatedValue2); |
| } |
| |
| @Override |
| public String fold(String input1, String input2) |
| { |
| return input1 + ", " + input2; |
| } |
| }; |
| |
| String[] ss = new String[]{"b", "c", "d", "e"}; |
| String base = "a"; |
| |
| for (String s : ss) { |
| base = concat.accumulate(base, s); |
| } |
| Assert.assertEquals("a, b, c, d, e", base); |
| } |
| } |