| /* |
| * 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.transforms; |
| |
| import static org.hamcrest.MatcherAssert.assertThat; |
| import static org.hamcrest.Matchers.instanceOf; |
| import static org.hamcrest.Matchers.isOneOf; |
| import static org.hamcrest.Matchers.nullValue; |
| import static org.junit.Assert.assertEquals; |
| |
| import java.util.ArrayList; |
| import org.apache.beam.sdk.coders.CannotProvideCoderException; |
| import org.apache.beam.sdk.coders.CoderRegistry; |
| import org.apache.beam.sdk.coders.NullableCoder; |
| import org.apache.beam.sdk.coders.VarLongCoder; |
| import org.apache.beam.sdk.values.TimestampedValue; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.Lists; |
| import org.joda.time.Instant; |
| import org.junit.Rule; |
| import org.junit.Test; |
| import org.junit.rules.ExpectedException; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.JUnit4; |
| |
| /** Unit tests for {@link Latest.LatestFn}. */ |
| @RunWith(JUnit4.class) |
| public class LatestFnTest { |
| private static final Instant INSTANT = new Instant(100); |
| private static final long VALUE = 100 * INSTANT.getMillis(); |
| |
| private static final TimestampedValue<Long> TV = TimestampedValue.of(VALUE, INSTANT); |
| private static final TimestampedValue<Long> TV_MINUS_TEN = |
| TimestampedValue.of(VALUE - 10, INSTANT.minus(10)); |
| private static final TimestampedValue<Long> TV_PLUS_TEN = |
| TimestampedValue.of(VALUE + 10, INSTANT.plus(10)); |
| |
| @Rule public final ExpectedException thrown = ExpectedException.none(); |
| |
| private final Latest.LatestFn<Long> fn = new Latest.LatestFn<>(); |
| private final Instant baseTimestamp = Instant.now(); |
| |
| @Test |
| public void testDefaultValue() { |
| assertThat(fn.defaultValue(), nullValue()); |
| } |
| |
| @Test |
| public void testCreateAccumulator() { |
| assertEquals(TimestampedValue.atMinimumTimestamp(null), fn.createAccumulator()); |
| } |
| |
| @Test |
| public void testAddInputInitialAdd() { |
| TimestampedValue<Long> input = TV; |
| assertEquals(input, fn.addInput(fn.createAccumulator(), input)); |
| } |
| |
| @Test |
| public void testAddInputMinTimestamp() { |
| TimestampedValue<Long> input = TimestampedValue.atMinimumTimestamp(1234L); |
| assertEquals(input, fn.addInput(fn.createAccumulator(), input)); |
| } |
| |
| @Test |
| public void testAddInputEarlierValue() { |
| assertEquals(TV, fn.addInput(TV, TV_MINUS_TEN)); |
| } |
| |
| @Test |
| public void testAddInputLaterValue() { |
| assertEquals(TV_PLUS_TEN, fn.addInput(TV, TV_PLUS_TEN)); |
| } |
| |
| @Test |
| public void testAddInputSameTimestamp() { |
| TimestampedValue<Long> accum = TimestampedValue.of(100L, INSTANT); |
| TimestampedValue<Long> input = TimestampedValue.of(200L, INSTANT); |
| |
| assertThat( |
| "Latest for values with the same timestamp is chosen arbitrarily", |
| fn.addInput(accum, input), |
| isOneOf(accum, input)); |
| } |
| |
| @Test |
| public void testAddInputNullAccumulator() { |
| thrown.expect(NullPointerException.class); |
| thrown.expectMessage("accumulator"); |
| fn.addInput(null, TV); |
| } |
| |
| @Test |
| public void testAddInputNullInput() { |
| thrown.expect(NullPointerException.class); |
| thrown.expectMessage("input"); |
| fn.addInput(TV, null); |
| } |
| |
| @Test |
| public void testAddInputNullValue() { |
| TimestampedValue<Long> input = TimestampedValue.of(null, INSTANT.plus(10)); |
| assertEquals("Null values are allowed", input, fn.addInput(TV, input)); |
| } |
| |
| @Test |
| public void testMergeAccumulatorsMultipleValues() { |
| Iterable<TimestampedValue<Long>> accums = Lists.newArrayList(TV, TV_PLUS_TEN, TV_MINUS_TEN); |
| |
| assertEquals(TV_PLUS_TEN, fn.mergeAccumulators(accums)); |
| } |
| |
| @Test |
| public void testMergeAccumulatorsSingleValue() { |
| assertEquals(TV, fn.mergeAccumulators(Lists.newArrayList(TV))); |
| } |
| |
| @Test |
| public void testMergeAccumulatorsEmptyIterable() { |
| ArrayList<TimestampedValue<Long>> emptyAccums = Lists.newArrayList(); |
| assertEquals(TimestampedValue.atMinimumTimestamp(null), fn.mergeAccumulators(emptyAccums)); |
| } |
| |
| @Test |
| public void testMergeAccumulatorsDefaultAccumulator() { |
| TimestampedValue<Long> defaultAccum = fn.createAccumulator(); |
| assertEquals(TV, fn.mergeAccumulators(Lists.newArrayList(TV, defaultAccum))); |
| } |
| |
| @Test |
| public void testMergeAccumulatorsAllDefaultAccumulators() { |
| TimestampedValue<Long> defaultAccum = fn.createAccumulator(); |
| assertEquals( |
| defaultAccum, fn.mergeAccumulators(Lists.newArrayList(defaultAccum, defaultAccum))); |
| } |
| |
| @Test |
| public void testMergeAccumulatorsNullIterable() { |
| thrown.expect(NullPointerException.class); |
| thrown.expectMessage("accumulators"); |
| fn.mergeAccumulators(null); |
| } |
| |
| @Test |
| public void testExtractOutput() { |
| assertEquals(TV.getValue(), fn.extractOutput(TV)); |
| } |
| |
| @Test |
| public void testExtractOutputDefaultAccumulator() { |
| TimestampedValue<Long> accum = fn.createAccumulator(); |
| assertThat(fn.extractOutput(accum), nullValue()); |
| } |
| |
| @Test |
| public void testExtractOutputNullValue() { |
| TimestampedValue<Long> accum = TimestampedValue.of(null, baseTimestamp); |
| assertEquals(null, fn.extractOutput(accum)); |
| } |
| |
| @Test |
| public void testDefaultCoderHandlesNull() throws CannotProvideCoderException { |
| Latest.LatestFn<Long> fn = new Latest.LatestFn<>(); |
| |
| CoderRegistry registry = CoderRegistry.createDefault(); |
| TimestampedValue.TimestampedValueCoder<Long> inputCoder = |
| TimestampedValue.TimestampedValueCoder.of(VarLongCoder.of()); |
| |
| assertThat( |
| "Default output coder should handle null values", |
| fn.getDefaultOutputCoder(registry, inputCoder), |
| instanceOf(NullableCoder.class)); |
| assertThat( |
| "Default accumulator coder should handle null values", |
| fn.getAccumulatorCoder(registry, inputCoder), |
| instanceOf(NullableCoder.class)); |
| } |
| } |