| /** |
| * 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 storm.starter.tools; |
| |
| import org.testng.annotations.DataProvider; |
| import org.testng.annotations.Test; |
| |
| import java.util.Map; |
| |
| import static org.fest.assertions.api.Assertions.assertThat; |
| |
| public class SlidingWindowCounterTest { |
| |
| private static final int ANY_WINDOW_LENGTH_IN_SLOTS = 2; |
| private static final Object ANY_OBJECT = "ANY_OBJECT"; |
| |
| @DataProvider |
| public Object[][] illegalWindowLengths() { |
| return new Object[][]{ { -10 }, { -3 }, { -2 }, { -1 }, { 0 }, { 1 } }; |
| } |
| |
| @Test(expectedExceptions = IllegalArgumentException.class, dataProvider = "illegalWindowLengths") |
| public void lessThanTwoSlotsShouldThrowIAE(int windowLengthInSlots) { |
| new SlidingWindowCounter<Object>(windowLengthInSlots); |
| } |
| |
| @DataProvider |
| public Object[][] legalWindowLengths() { |
| return new Object[][]{ { 2 }, { 3 }, { 20 } }; |
| } |
| |
| @Test(dataProvider = "legalWindowLengths") |
| public void twoOrMoreSlotsShouldBeValid(int windowLengthInSlots) { |
| new SlidingWindowCounter<Object>(windowLengthInSlots); |
| } |
| |
| @Test |
| public void newInstanceShouldHaveEmptyCounts() { |
| // given |
| SlidingWindowCounter<Object> counter = new SlidingWindowCounter<Object>(ANY_WINDOW_LENGTH_IN_SLOTS); |
| |
| // when |
| Map<Object, Long> counts = counter.getCountsThenAdvanceWindow(); |
| |
| // then |
| assertThat(counts).isEmpty(); |
| } |
| |
| @DataProvider |
| public Object[][] simulatedCounterIterations() { |
| return new Object[][]{ { 2, new int[]{ 3, 2, 0, 0, 1, 0, 0, 0 }, new long[]{ 3, 5, 2, 0, 1, 1, 0, 0 } }, |
| { 3, new int[]{ 3, 2, 0, 0, 1, 0, 0, 0 }, new long[]{ 3, 5, 5, 2, 1, 1, 1, 0 } }, |
| { 4, new int[]{ 3, 2, 0, 0, 1, 0, 0, 0 }, new long[]{ 3, 5, 5, 5, 3, 1, 1, 1 } }, |
| { 5, new int[]{ 3, 2, 0, 0, 1, 0, 0, 0 }, new long[]{ 3, 5, 5, 5, 6, 3, 1, 1 } }, |
| { 5, new int[]{ 3, 11, 5, 13, 7, 17, 0, 3, 50, 600, 7000 }, |
| new long[]{ 3, 14, 19, 32, 39, 53, 42, 40, 77, 670, 7653 } }, }; |
| } |
| |
| @Test(dataProvider = "simulatedCounterIterations") |
| public void testCounterWithSimulatedRuns(int windowLengthInSlots, int[] incrementsPerIteration, |
| long[] expCountsPerIteration) { |
| // given |
| SlidingWindowCounter<Object> counter = new SlidingWindowCounter<Object>(windowLengthInSlots); |
| int numIterations = incrementsPerIteration.length; |
| |
| for (int i = 0; i < numIterations; i++) { |
| int numIncrements = incrementsPerIteration[i]; |
| long expCounts = expCountsPerIteration[i]; |
| // Objects are absent if they were zero both this iteration |
| // and the last -- if only this one, we need to report zero. |
| boolean expAbsent = ((expCounts == 0) && ((i == 0) || (expCountsPerIteration[i - 1] == 0))); |
| |
| // given (for this iteration) |
| for (int j = 0; j < numIncrements; j++) { |
| counter.incrementCount(ANY_OBJECT); |
| } |
| |
| // when (for this iteration) |
| Map<Object, Long> counts = counter.getCountsThenAdvanceWindow(); |
| |
| // then (for this iteration) |
| if (expAbsent) { |
| assertThat(counts).doesNotContainKey(ANY_OBJECT); |
| } |
| else { |
| assertThat(counts.get(ANY_OBJECT)).isEqualTo(expCounts); |
| } |
| } |
| } |
| |
| } |