| /* |
| * 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.fs.swift; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FSDataInputStream; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.swift.http.SwiftProtocolConstants; |
| import org.apache.hadoop.fs.swift.util.SwiftTestUtils; |
| import org.apache.hadoop.io.IOUtils; |
| import org.junit.After; |
| import org.junit.Test; |
| |
| /** |
| * Seek tests verify that |
| * <ol> |
| * <li>When you seek on a 0 byte file to byte (0), it's not an error.</li> |
| * <li>When you seek past the end of a file, it's an error that should |
| * raise -what- EOFException?</li> |
| * <li>when you seek forwards, you get new data</li> |
| * <li>when you seek backwards, you get the previous data</li> |
| * <li>That this works for big multi-MB files as well as small ones.</li> |
| * </ol> |
| * These may seem "obvious", but the more the input streams try to be clever |
| * about offsets and buffering, the more likely it is that seek() will start |
| * to get confused. |
| */ |
| public class TestReadPastBuffer extends SwiftFileSystemBaseTest { |
| protected static final Log LOG = |
| LogFactory.getLog(TestReadPastBuffer.class); |
| public static final int SWIFT_READ_BLOCKSIZE = 4096; |
| public static final int SEEK_FILE_LEN = SWIFT_READ_BLOCKSIZE * 2; |
| |
| private Path testPath; |
| private Path readFile; |
| private Path zeroByteFile; |
| private FSDataInputStream instream; |
| |
| |
| /** |
| * Get a configuration which a small blocksize reported to callers |
| * @return a configuration for this test |
| */ |
| @Override |
| public Configuration getConf() { |
| Configuration conf = super.getConf(); |
| /* |
| * set to 4KB |
| */ |
| conf.setInt(SwiftProtocolConstants.SWIFT_BLOCKSIZE, SWIFT_READ_BLOCKSIZE); |
| return conf; |
| } |
| |
| /** |
| * Setup creates dirs under test/hadoop |
| * |
| * @throws Exception |
| */ |
| @Override |
| public void setUp() throws Exception { |
| super.setUp(); |
| byte[] block = SwiftTestUtils.dataset(SEEK_FILE_LEN, 0, 255); |
| |
| //delete the test directory |
| testPath = path("/test"); |
| readFile = new Path(testPath, "TestReadPastBuffer.txt"); |
| createFile(readFile, block); |
| } |
| |
| @After |
| public void cleanFile() { |
| IOUtils.closeStream(instream); |
| instream = null; |
| } |
| |
| /** |
| * Create a config with a 1KB request size |
| * @return a config |
| */ |
| @Override |
| protected Configuration createConfiguration() { |
| Configuration conf = super.createConfiguration(); |
| conf.set(SwiftProtocolConstants.SWIFT_REQUEST_SIZE, "1"); |
| return conf; |
| } |
| |
| /** |
| * Seek past the buffer then read |
| * @throws Throwable problems |
| */ |
| @Test(timeout = SWIFT_TEST_TIMEOUT) |
| public void testSeekAndReadPastEndOfFile() throws Throwable { |
| instream = fs.open(readFile); |
| assertEquals(0, instream.getPos()); |
| //expect that seek to 0 works |
| //go just before the end |
| instream.seek(SEEK_FILE_LEN - 2); |
| assertTrue("Premature EOF", instream.read() != -1); |
| assertTrue("Premature EOF", instream.read() != -1); |
| assertMinusOne("read past end of file", instream.read()); |
| } |
| |
| /** |
| * Seek past the buffer and attempt a read(buffer) |
| * @throws Throwable failures |
| */ |
| @Test(timeout = SWIFT_TEST_TIMEOUT) |
| public void testSeekBulkReadPastEndOfFile() throws Throwable { |
| instream = fs.open(readFile); |
| assertEquals(0, instream.getPos()); |
| //go just before the end |
| instream.seek(SEEK_FILE_LEN - 1); |
| byte[] buffer = new byte[1]; |
| int result = instream.read(buffer, 0, 1); |
| //next byte is expected to fail |
| result = instream.read(buffer, 0, 1); |
| assertMinusOne("read past end of file", result); |
| //and this one |
| result = instream.read(buffer, 0, 1); |
| assertMinusOne("read past end of file", result); |
| |
| //now do an 0-byte read and expect it to |
| //to be checked first |
| result = instream.read(buffer, 0, 0); |
| assertEquals("EOF checks coming before read range check", 0, result); |
| |
| } |
| |
| |
| |
| /** |
| * Read past the buffer size byte by byte and verify that it refreshed |
| * @throws Throwable |
| */ |
| @Test |
| public void testReadPastBufferSize() throws Throwable { |
| instream = fs.open(readFile); |
| |
| while (instream.read() != -1); |
| //here we have gone past the end of a file and its buffer. Now try again |
| assertMinusOne("reading after the (large) file was read: "+ instream, |
| instream.read()); |
| } |
| } |
| |