| /* |
| * 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.cassandra.utils.concurrent; |
| |
| import java.util.Iterator; |
| |
| import org.junit.Test; |
| |
| import static org.junit.Assert.*; |
| |
| public class AccumulatorTest |
| { |
| @Test |
| public void testAddMoreThanCapacity() |
| { |
| Accumulator<Integer> accu = new Accumulator<>(4); |
| |
| accu.add(1); |
| accu.add(2); |
| accu.add(3); |
| accu.add(4); |
| |
| try |
| { |
| accu.add(5); |
| fail(); |
| } |
| catch (IllegalStateException e) |
| { |
| // Expected |
| } |
| } |
| |
| @Test |
| public void testIsEmptyAndSize() |
| { |
| Accumulator<Integer> accu = new Accumulator<>(4); |
| |
| assertTrue(accu.isEmpty()); |
| assertEquals(0, accu.size()); |
| |
| accu.add(1); |
| accu.add(2); |
| |
| assertFalse(accu.isEmpty()); |
| assertEquals(2, accu.size()); |
| |
| accu.add(3); |
| accu.add(4); |
| |
| assertFalse(accu.isEmpty()); |
| assertEquals(4, accu.size()); |
| } |
| |
| @Test |
| public void testGetAndIterator() |
| { |
| Accumulator<String> accu = new Accumulator<>(4); |
| |
| accu.add("3"); |
| accu.add("2"); |
| accu.add("4"); |
| |
| assertEquals("3", accu.get(0)); |
| assertEquals("2", accu.get(1)); |
| assertEquals("4", accu.get(2)); |
| |
| assertOutOfBonds(accu, 3); |
| |
| accu.add("0"); |
| |
| assertEquals("0", accu.get(3)); |
| |
| Iterator<String> iter = accu.snapshot().iterator(); |
| |
| assertEquals("3", iter.next()); |
| assertEquals("2", iter.next()); |
| assertEquals("4", iter.next()); |
| assertEquals("0", iter.next()); |
| assertFalse(iter.hasNext()); |
| } |
| |
| @Test |
| public void testClearUnsafe() |
| { |
| Accumulator<String> accu = new Accumulator<>(5); |
| |
| accu.add("1"); |
| accu.add("2"); |
| accu.add("3"); |
| |
| accu.clearUnsafe(1); |
| |
| assertEquals(3, accu.size()); |
| assertTrue(accu.snapshot().iterator().hasNext()); |
| |
| accu.add("4"); |
| accu.add("5"); |
| |
| assertEquals(5, accu.size()); |
| |
| assertEquals("4", accu.get(3)); |
| assertEquals("5", accu.get(4)); |
| assertOutOfBonds(accu, 5); |
| |
| Iterator<String> iter = accu.snapshot().iterator(); |
| assertTrue(iter.hasNext()); |
| assertEquals("1", iter.next()); |
| assertNull(iter.next()); |
| assertTrue(iter.hasNext()); |
| assertEquals("3", iter.next()); |
| } |
| |
| private static void assertOutOfBonds(Accumulator<String> accumulator, int index) |
| { |
| try |
| { |
| assertNull(accumulator.get(index)); |
| fail(); |
| } |
| catch (IndexOutOfBoundsException e) |
| { |
| // Expected |
| } |
| } |
| } |