| /** |
| * 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.hadoop.hdfs.client.impl; |
| |
| import static org.junit.Assert.assertEquals; |
| |
| import java.io.IOException; |
| import java.util.Random; |
| |
| import org.apache.hadoop.fs.FSDataOutputStream; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hdfs.BlockReader; |
| import org.apache.hadoop.hdfs.DistributedFileSystem; |
| import org.apache.hadoop.hdfs.HdfsConfiguration; |
| import org.apache.hadoop.hdfs.protocol.LocatedBlock; |
| import org.junit.After; |
| import org.junit.Before; |
| import org.junit.Test; |
| |
| abstract public class TestBlockReaderBase { |
| private BlockReaderTestUtil util; |
| private byte[] blockData; |
| private BlockReader reader; |
| |
| /** |
| * if override this, make sure return array length is less than |
| * block size. |
| */ |
| byte [] getBlockData() { |
| int length = 1 << 22; |
| byte[] data = new byte[length]; |
| for (int i = 0; i < length; i++) { |
| data[i] = (byte) (i % 133); |
| } |
| return data; |
| } |
| |
| private BlockReader getBlockReader(LocatedBlock block) throws Exception { |
| return util.getBlockReader(block, 0, blockData.length); |
| } |
| |
| abstract HdfsConfiguration createConf(); |
| |
| @Before |
| public void setup() throws Exception { |
| util = new BlockReaderTestUtil(1, createConf()); |
| blockData = getBlockData(); |
| DistributedFileSystem fs = util.getCluster().getFileSystem(); |
| Path testfile = new Path("/testfile"); |
| FSDataOutputStream fout = fs.create(testfile); |
| fout.write(blockData); |
| fout.close(); |
| LocatedBlock blk = util.getFileBlocks(testfile, blockData.length).get(0); |
| reader = getBlockReader(blk); |
| } |
| |
| @After |
| public void shutdown() throws Exception { |
| util.shutdown(); |
| } |
| |
| @Test(timeout=60000) |
| public void testSkip() throws IOException { |
| Random random = new Random(); |
| byte [] buf = new byte[1]; |
| for (int pos = 0; pos < blockData.length;) { |
| long skip = random.nextInt(100) + 1; |
| long skipped = reader.skip(skip); |
| if (pos + skip >= blockData.length) { |
| assertEquals(blockData.length, pos + skipped); |
| break; |
| } else { |
| assertEquals(skip, skipped); |
| pos += skipped; |
| assertEquals(1, reader.read(buf, 0, 1)); |
| |
| assertEquals(blockData[pos], buf[0]); |
| pos += 1; |
| } |
| } |
| } |
| } |