| /* |
| * 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.wayang.basic.mapping; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| import org.apache.wayang.basic.data.Tuple2; |
| import org.apache.wayang.basic.function.ProjectionDescriptor; |
| import org.apache.wayang.basic.operators.GroupByOperator; |
| import org.apache.wayang.basic.operators.ReduceByOperator; |
| import org.apache.wayang.basic.operators.ReduceOperator; |
| import org.apache.wayang.basic.operators.test.TestSink; |
| import org.apache.wayang.basic.operators.test.TestSource; |
| import org.apache.wayang.core.function.ReduceDescriptor; |
| import org.apache.wayang.core.mapping.Mapping; |
| import org.apache.wayang.core.mapping.PlanTransformation; |
| import org.apache.wayang.core.plan.wayangplan.Operator; |
| import org.apache.wayang.core.plan.wayangplan.WayangPlan; |
| import org.apache.wayang.core.plan.wayangplan.UnarySink; |
| import org.apache.wayang.core.plan.wayangplan.UnarySource; |
| import org.apache.wayang.core.types.DataSetType; |
| import org.apache.wayang.core.types.DataUnitType; |
| |
| /** |
| * Test suite for the {@link ReduceByMapping}. |
| */ |
| public class ReduceByMappingTest { |
| |
| @Test |
| public void testMapping() { |
| // Construct a plan: source -> groupBy -> reduce -> sink. |
| UnarySource<Tuple2<String, Integer>> source = new TestSource<>(DataSetType.createDefault(Tuple2.class)); |
| |
| final ProjectionDescriptor<Tuple2<String, Integer>, String> keyDescriptor = new ProjectionDescriptor<>( |
| DataUnitType.createBasicUnchecked(Tuple2.class), |
| DataUnitType.createBasic(String.class), |
| "field0"); |
| GroupByOperator<Tuple2<String, Integer>, String> groupBy = new GroupByOperator<>( |
| keyDescriptor, |
| DataSetType.createDefaultUnchecked(Tuple2.class), |
| DataSetType.createGroupedUnchecked(Tuple2.class) |
| ); |
| source.connectTo(0, groupBy, 0); |
| |
| final ReduceDescriptor<Tuple2<String, Integer>> reduceDescriptor = new ReduceDescriptor<>( |
| (a, b) -> a, DataUnitType.createGroupedUnchecked(Tuple2.class), |
| DataUnitType.createBasicUnchecked(Tuple2.class) |
| ); |
| ReduceOperator<Tuple2<String, Integer>> reduce = ReduceOperator.createGroupedReduce( |
| reduceDescriptor, |
| DataSetType.createGroupedUnchecked(Tuple2.class), |
| DataSetType.createDefaultUnchecked(Tuple2.class) |
| ); |
| groupBy.connectTo(0, reduce, 0); |
| |
| UnarySink<Tuple2<String, Integer>> sink = new TestSink<>(DataSetType.createDefaultUnchecked(Tuple2.class)); |
| reduce.connectTo(0, sink, 0); |
| WayangPlan plan = new WayangPlan(); |
| plan.addSink(sink); |
| |
| // Apply our mapping. |
| Mapping mapping = new ReduceByMapping(); |
| for (PlanTransformation planTransformation : mapping.getTransformations()) { |
| planTransformation.thatReplaces().transform(plan, Operator.FIRST_EPOCH + 1); |
| } |
| |
| // Check that now we have this plan: source -> reduceBy -> sink. |
| final Operator finalSink = plan.getSinks().iterator().next(); |
| final Operator inputOperator = finalSink.getEffectiveOccupant(0).getOwner(); |
| Assert.assertTrue(inputOperator instanceof ReduceByOperator); |
| ReduceByOperator reduceBy = (ReduceByOperator) inputOperator; |
| Assert.assertEquals(keyDescriptor, reduceBy.getKeyDescriptor()); |
| Assert.assertEquals(reduceDescriptor, reduceBy.getReduceDescriptor()); |
| Assert.assertEquals(source, reduceBy.getEffectiveOccupant(0).getOwner()); |
| } |
| } |