001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.io.hfile.bucket;
019
020import static org.apache.hadoop.hbase.io.hfile.bucket.TestByteBufferIOEngine.createBucketEntry;
021import static org.apache.hadoop.hbase.io.hfile.bucket.TestByteBufferIOEngine.getByteBuff;
022import static org.junit.jupiter.api.Assertions.assertEquals;
023
024import java.io.File;
025import java.io.IOException;
026import org.apache.hadoop.hbase.nio.ByteBuff;
027import org.apache.hadoop.hbase.testclassification.IOTests;
028import org.apache.hadoop.hbase.testclassification.SmallTests;
029import org.junit.jupiter.api.Tag;
030import org.junit.jupiter.api.Test;
031
032/**
033 * Basic test for {@link ExclusiveMemoryMmapIOEngine}
034 */
035@Tag(IOTests.TAG)
036@Tag(SmallTests.TAG)
037public class TestExclusiveMemoryMmapEngine {
038
039  @Test
040  public void testFileMmapEngine() throws IOException {
041    int size = 2 * 1024 * 1024; // 2 MB
042    String filePath = "testFileMmapEngine";
043    try {
044      ExclusiveMemoryMmapIOEngine fileMmapEngine = new ExclusiveMemoryMmapIOEngine(filePath, size);
045      for (int i = 0; i < 50; i++) {
046        int len = (int) Math.floor(Math.random() * 100);
047        long offset = (long) Math.floor(Math.random() * size % (size - len));
048        int val = (int) (Math.random() * 255);
049
050        // write
051        ByteBuff src = TestByteBufferIOEngine.createByteBuffer(len, val, i % 2 == 0);
052        int pos = src.position(), lim = src.limit();
053        fileMmapEngine.write(src, offset);
054        src.position(pos).limit(lim);
055
056        // read
057        BucketEntry be = createBucketEntry(offset, len);
058        fileMmapEngine.read(be);
059        ByteBuff dst = getByteBuff(be);
060
061        assertEquals(src.remaining(), len);
062        assertEquals(dst.remaining(), len);
063        assertEquals(0, ByteBuff.compareTo(src, pos, len, dst, dst.position(), dst.remaining()));
064      }
065    } finally {
066      File file = new File(filePath);
067      if (file.exists()) {
068        file.delete();
069      }
070    }
071  }
072}