| /* |
| * 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.giraph.block_app.reducers.array; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.fail; |
| |
| import org.apache.giraph.block_app.reducers.array.HugeArrayUtils.ObjectStriping; |
| import org.junit.Test; |
| |
| public class ObjectStripingTest { |
| |
| private void testStriping(int size, int splits) { |
| ObjectStriping striping = new ObjectStriping(size, splits); |
| |
| int numPerSplit = size / splits; |
| |
| int prevSplitIndex = 0; |
| int prevInsideIndex = -1; |
| |
| assertEquals(0, striping.getSplitStart(0)); |
| |
| for (int i = 0; i < size; i++) { |
| int splitIndex = striping.getSplitIndex(i); |
| int insideIndex = striping.getInsideIndex(i); |
| |
| |
| if (prevInsideIndex + 1 == striping.getSplitSize(prevSplitIndex)) { |
| assertEquals(i, striping.getSplitStart(splitIndex)); |
| assertEquals(splitIndex, prevSplitIndex + 1); |
| assertEquals(insideIndex, 0); |
| } else { |
| assertEquals(splitIndex, prevSplitIndex); |
| assertEquals(insideIndex, prevInsideIndex + 1); |
| } |
| |
| int splitSize = striping.getSplitSize(splitIndex); |
| if (splitSize != numPerSplit && splitSize != numPerSplit + 1) { |
| fail(splitSize + " " + numPerSplit); |
| } |
| prevSplitIndex = splitIndex; |
| prevInsideIndex = insideIndex; |
| } |
| |
| assertEquals(prevSplitIndex + 1, splits); |
| assertEquals(prevInsideIndex + 1, striping.getSplitSize(prevSplitIndex)); |
| } |
| |
| @Test |
| public void test() { |
| testStriping(5, 5); |
| testStriping(6, 5); |
| testStriping(7, 5); |
| testStriping(9, 5); |
| testStriping(10, 5); |
| testStriping(100, 5); |
| testStriping(101, 5); |
| testStriping(104, 5); |
| } |
| } |