| /* |
| * 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.beam.sdk.extensions.sql.impl; |
| |
| import static org.hamcrest.MatcherAssert.assertThat; |
| import static org.hamcrest.Matchers.instanceOf; |
| import static org.junit.Assert.assertEquals; |
| |
| import org.apache.beam.sdk.coders.CannotProvideCoderException; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.coders.CoderRegistry; |
| import org.apache.beam.sdk.coders.VarLongCoder; |
| import org.apache.beam.sdk.extensions.sql.udf.AggregateFn; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.ImmutableList; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.JUnit4; |
| |
| /** Tests for {@link LazyAggregateCombineFn}. */ |
| @RunWith(JUnit4.class) |
| public class LazyAggregateCombineFnTest { |
| |
| @Test |
| public void getAccumulatorCoderInfersCoderForWildcardTypeParameter() |
| throws CannotProvideCoderException { |
| LazyAggregateCombineFn<Long, ?, ?> combiner = new LazyAggregateCombineFn<>(new Sum()); |
| Coder<?> coder = combiner.getAccumulatorCoder(CoderRegistry.createDefault(), VarLongCoder.of()); |
| assertThat(coder, instanceOf(VarLongCoder.class)); |
| } |
| |
| @Test |
| public void mergeAccumulators() { |
| LazyAggregateCombineFn<Long, Long, Long> combiner = new LazyAggregateCombineFn<>(new Sum()); |
| long merged = combiner.mergeAccumulators(ImmutableList.of(1L, 1L)); |
| assertEquals(2L, merged); |
| } |
| |
| public static class Sum implements AggregateFn<Long, Long, Long> { |
| |
| @Override |
| public Long createAccumulator() { |
| return 0L; |
| } |
| |
| @Override |
| public Long addInput(Long mutableAccumulator, Long input) { |
| return mutableAccumulator + input; |
| } |
| |
| @Override |
| public Long mergeAccumulators(Long mutableAccumulator, Iterable<Long> immutableAccumulators) { |
| for (Long x : immutableAccumulators) { |
| mutableAccumulator += x; |
| } |
| return mutableAccumulator; |
| } |
| |
| @Override |
| public Long extractOutput(Long mutableAccumulator) { |
| return mutableAccumulator; |
| } |
| } |
| } |