Java tutorial
/** * Copyright 2015 StreamSets Inc. * * Licensed under 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 com.streamsets.pipeline.lib.io; import org.apache.commons.io.IOUtils; import org.junit.Assert; import org.junit.Before; import org.junit.Test; import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.io.Writer; import java.nio.charset.Charset; import java.nio.charset.StandardCharsets; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.util.Arrays; import java.util.List; import java.util.UUID; public class TestSingleLineLiveFileReader { private File testDir; @Before public void setUp() throws IOException { testDir = new File("target", UUID.randomUUID().toString()); Assert.assertTrue(testDir.mkdirs()); } private Path createFile(List<String> lines) throws IOException { Path file = new File(testDir, UUID.randomUUID().toString()).toPath(); try (Writer writer = new FileWriter(file.toFile())) { IOUtils.writeLines(lines, "", writer); } return file; } private String readChunk(LiveFileChunk chunk) throws IOException { char[] data = new char[chunk.getLength()]; IOUtils.readFully(chunk.getReader(), data); return new String(data); } @Test public void testMethods() throws Exception { Path file = createFile(Arrays.asList("Hello1\n", "Hello2\n")); LiveFile lf = new LiveFile(file); LiveFileReader lfr = new SingleLineLiveFileReader( LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.defaultCharset(), 0, 10); Assert.assertEquals(Charset.defaultCharset(), lfr.getCharset()); Assert.assertEquals(lf, lfr.getLiveFile()); lfr.close(); lfr.close(); } @Test public void testValidCharsets() throws Exception { Path file = createFile(Arrays.asList("Hello1\n", "Hello2\n")); LiveFile lf = new LiveFile(file); new SingleLineLiveFileReader(LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.forName("US-ASCII"), 0, 10); new SingleLineLiveFileReader(LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, StandardCharsets.UTF_8, 0, 10); new SingleLineLiveFileReader(LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.forName("GBK"), 0, 10); new SingleLineLiveFileReader(LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.forName("ISO-8859-1"), 0, 10); new SingleLineLiveFileReader(LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.forName("shift_jis"), 0, 10); new SingleLineLiveFileReader(LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.forName("euc-jp"), 0, 10); new SingleLineLiveFileReader(LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.forName("euc-kr"), 0, 10); new SingleLineLiveFileReader(LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.forName("koi8-r"), 0, 10); } @Test(expected = IllegalArgumentException.class) public void testInvalidCharset1() throws Exception { Path file = createFile(Arrays.asList("Hello1\n", "Hello2\n")); LiveFile lf = new LiveFile(file); new SingleLineLiveFileReader(LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.forName("UTF-16"), 0, 10); } @Test(expected = IllegalArgumentException.class) public void testInvalidCharset2() throws Exception { Path file = createFile(Arrays.asList("Hello1\n", "Hello2\n")); LiveFile lf = new LiveFile(file); new SingleLineLiveFileReader(LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.forName("UTF-32"), 0, 10); } @Test(expected = IllegalArgumentException.class) public void testInvalidCharset3() throws Exception { Path file = createFile(Arrays.asList("Hello1\n", "Hello2\n")); LiveFile lf = new LiveFile(file); new SingleLineLiveFileReader(LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.forName("IBM500"), 0, 10); } @Test(expected = IOException.class) public void testInvalidOffset() throws Exception { Path file = createFile(Arrays.asList("Hello")); LiveFile lf = new LiveFile(file); new SingleLineLiveFileReader(LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.defaultCharset(), 10, 10); } @Test public void testOneLineReadFromBeginningFullLinesNoTruncate() throws Exception { Path file = createFile(Arrays.asList("Hello1\n", "Hello2\n")); LiveFile lf = new LiveFile(file); LiveFileReader lfr = new SingleLineLiveFileReader( LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.defaultCharset(), 0, 10); Assert.assertTrue(lfr.hasNext()); LiveFileChunk chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertFalse(chunk.isTruncated()); Assert.assertEquals(0, chunk.getOffset()); Assert.assertEquals(7, chunk.getLength()); Assert.assertEquals("Hello1\n", readChunk(chunk)); Assert.assertEquals(7, lfr.getOffset()); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertFalse(chunk.isTruncated()); Assert.assertEquals(7, chunk.getOffset()); Assert.assertEquals(7, chunk.getLength()); Assert.assertEquals("Hello2\n", readChunk(chunk)); Assert.assertEquals(14, lfr.getOffset()); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNull(chunk); Assert.assertEquals(14, lfr.getOffset()); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNull(chunk); Assert.assertEquals(14, lfr.getOffset()); Files.move(file, Paths.get(file.getParent().toString(), UUID.randomUUID().toString())); Thread.sleep(SingleLineLiveFileReader.REFRESH_INTERVAL + 1); Assert.assertFalse(lfr.hasNext()); Assert.assertEquals(14, lfr.getOffset()); // next() after EOF returns null Assert.assertNull(lfr.next(0)); lfr.close(); } @Test public void testOneLineReadFromBeginningLastLineNoEOLNoTruncate() throws Exception { Path file = createFile(Arrays.asList("Hello1\n", "Hello2")); LiveFile lf = new LiveFile(file); LiveFileReader lfr = new SingleLineLiveFileReader( LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.defaultCharset(), 0, 10); Assert.assertTrue(lfr.hasNext()); LiveFileChunk chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertFalse(chunk.isTruncated()); Assert.assertEquals(0, chunk.getOffset()); Assert.assertEquals(7, chunk.getLength()); Assert.assertEquals("Hello1\n", readChunk(chunk)); Assert.assertEquals(7, lfr.getOffset()); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNull(chunk); Assert.assertEquals(7, lfr.getOffset()); Files.move(file, Paths.get(file.getParent().toString(), UUID.randomUUID().toString())); Thread.sleep(SingleLineLiveFileReader.REFRESH_INTERVAL + 1); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertFalse(chunk.isTruncated()); Assert.assertEquals(7, chunk.getOffset()); Assert.assertEquals(6, chunk.getLength()); Assert.assertEquals("Hello2", readChunk(chunk)); Assert.assertEquals(13, lfr.getOffset()); Assert.assertFalse(lfr.hasNext()); Assert.assertEquals(13, lfr.getOffset()); lfr.close(); } @Test public void testOneLineReadFromExactOffsetFullLinesNoTruncate() throws Exception { Path file = createFile(Arrays.asList("Hello1\n", "Hello2\n")); LiveFile lf = new LiveFile(file); LiveFileReader lfr = new SingleLineLiveFileReader( LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.defaultCharset(), 7, 10); Assert.assertTrue(lfr.hasNext()); LiveFileChunk chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertFalse(chunk.isTruncated()); Assert.assertEquals(7, chunk.getOffset()); Assert.assertEquals(7, chunk.getLength()); Assert.assertEquals("Hello2\n", readChunk(chunk)); Assert.assertEquals(14, lfr.getOffset()); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNull(chunk); Assert.assertEquals(14, lfr.getOffset()); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNull(chunk); Assert.assertEquals(14, lfr.getOffset()); Files.move(file, Paths.get(file.getParent().toString(), UUID.randomUUID().toString())); Thread.sleep(SingleLineLiveFileReader.REFRESH_INTERVAL + 1); Assert.assertFalse(lfr.hasNext()); lfr.close(); } @Test public void testOneLineReadFromExactOffsetLastLineNoEOLNoTruncate() throws Exception { Path file = createFile(Arrays.asList("Hello1\n", "Hello2")); LiveFile lf = new LiveFile(file); LiveFileReader lfr = new SingleLineLiveFileReader( LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.defaultCharset(), 7, 10); Assert.assertTrue(lfr.hasNext()); LiveFileChunk chunk = lfr.next(0); Assert.assertNull(chunk); Files.move(file, Paths.get(file.getParent().toString(), UUID.randomUUID().toString())); Thread.sleep(SingleLineLiveFileReader.REFRESH_INTERVAL + 1); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertFalse(chunk.isTruncated()); Assert.assertEquals(7, chunk.getOffset()); Assert.assertEquals(6, chunk.getLength()); Assert.assertEquals("Hello2", readChunk(chunk)); Assert.assertEquals(13, lfr.getOffset()); Assert.assertFalse(lfr.hasNext()); Assert.assertEquals(13, lfr.getOffset()); Assert.assertFalse(lfr.hasNext()); lfr.close(); } @Test public void testMultiLineReadFromBeginningFullLinesNoTruncate() throws Exception { Path file = createFile(Arrays.asList("Hello1\n", "Hello2\n")); LiveFile lf = new LiveFile(file); LiveFileReader lfr = new SingleLineLiveFileReader( LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.defaultCharset(), 0, 20); Assert.assertTrue(lfr.hasNext()); LiveFileChunk chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertFalse(chunk.isTruncated()); Assert.assertEquals(0, chunk.getOffset()); Assert.assertEquals(14, chunk.getLength()); Assert.assertEquals("Hello1\nHello2\n", readChunk(chunk)); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNull(chunk); Assert.assertEquals(14, lfr.getOffset()); Files.move(file, Paths.get(file.getParent().toString(), UUID.randomUUID().toString())); Thread.sleep(SingleLineLiveFileReader.REFRESH_INTERVAL + 1); Assert.assertFalse(lfr.hasNext()); Assert.assertEquals(14, lfr.getOffset()); lfr.close(); } @Test public void testMultiLineLineReadFromBeginningLastLineNoEOLNoTruncate() throws Exception { Path file = createFile(Arrays.asList("Hello1\n", "Hello2")); LiveFile lf = new LiveFile(file); LiveFileReader lfr = new SingleLineLiveFileReader( LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.defaultCharset(), 0, 20); Assert.assertTrue(lfr.hasNext()); LiveFileChunk chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertFalse(chunk.isTruncated()); Assert.assertEquals(0, chunk.getOffset()); Assert.assertEquals(7, chunk.getLength()); Assert.assertEquals("Hello1\n", readChunk(chunk)); Assert.assertEquals(7, lfr.getOffset()); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNull(chunk); Assert.assertEquals(7, lfr.getOffset()); Files.move(file, Paths.get(file.getParent().toString(), UUID.randomUUID().toString())); Thread.sleep(SingleLineLiveFileReader.REFRESH_INTERVAL + 1); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertFalse(chunk.isTruncated()); Assert.assertEquals(7, chunk.getOffset()); Assert.assertEquals(13, lfr.getOffset()); Assert.assertEquals("Hello2", readChunk(chunk)); Assert.assertFalse(lfr.hasNext()); Assert.assertEquals(13, lfr.getOffset()); lfr.close(); } @Test public void testOneLineReadFromBeginningFullLinesTruncate() throws Exception { Path file = createFile(Arrays.asList("Hello123456\n", "Hello2\n")); LiveFile lf = new LiveFile(file); LiveFileReader lfr = new SingleLineLiveFileReader( LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.defaultCharset(), 0, 10); Assert.assertTrue(lfr.hasNext()); LiveFileChunk chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertTrue(chunk.isTruncated()); Assert.assertEquals(0, chunk.getOffset()); Assert.assertEquals(10, chunk.getLength()); Assert.assertEquals("Hello12345", readChunk(chunk)); Assert.assertEquals(-10, lfr.getOffset()); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertFalse(chunk.isTruncated()); Assert.assertEquals(12, chunk.getOffset()); Assert.assertEquals(7, chunk.getLength()); Assert.assertEquals("Hello2\n", readChunk(chunk)); Assert.assertEquals(19, lfr.getOffset()); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNull(chunk); Assert.assertEquals(19, lfr.getOffset()); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNull(chunk); Assert.assertEquals(19, lfr.getOffset()); Files.move(file, Paths.get(file.getParent().toString(), UUID.randomUUID().toString())); Thread.sleep(SingleLineLiveFileReader.REFRESH_INTERVAL + 1); Assert.assertFalse(lfr.hasNext()); Assert.assertEquals(19, lfr.getOffset()); lfr.close(); } @Test public void testTruncateMultipleReads() throws Exception { Path file = createFile(Arrays.asList("Hello1234567890\n", "Hello\n")); LiveFile lf = new LiveFile(file); LiveFileReader lfr = new SingleLineLiveFileReader( LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.defaultCharset(), 0, 6); Assert.assertTrue(lfr.hasNext()); LiveFileChunk chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertTrue(chunk.isTruncated()); Assert.assertEquals(0, chunk.getOffset()); Assert.assertEquals(6, chunk.getLength()); Assert.assertEquals("Hello1", readChunk(chunk)); Assert.assertEquals(-6, lfr.getOffset()); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNull(chunk); Assert.assertEquals(-12, lfr.getOffset()); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertFalse(chunk.isTruncated()); Assert.assertEquals(16, chunk.getOffset()); Assert.assertEquals(6, chunk.getLength()); Assert.assertEquals("Hello\n", readChunk(chunk)); Assert.assertEquals(22, lfr.getOffset()); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNull(chunk); Assert.assertEquals(22, lfr.getOffset()); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNull(chunk); Assert.assertEquals(22, lfr.getOffset()); Files.move(file, Paths.get(file.getParent().toString(), UUID.randomUUID().toString())); Thread.sleep(SingleLineLiveFileReader.REFRESH_INTERVAL + 1); Assert.assertFalse(lfr.hasNext()); Assert.assertEquals(22, lfr.getOffset()); lfr.close(); } @Test public void testOneLineReadFromTruncatedOffset() throws Exception { Path file = createFile(Arrays.asList("Hello1\n", "Hello\n")); LiveFile lf = new LiveFile(file); LiveFileReader lfr = new SingleLineLiveFileReader( LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.defaultCharset(), -3, 10); Assert.assertTrue(lfr.hasNext()); LiveFileChunk chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertFalse(chunk.isTruncated()); Assert.assertEquals(7, chunk.getOffset()); Assert.assertEquals(6, chunk.getLength()); Assert.assertEquals("Hello\n", readChunk(chunk)); Assert.assertEquals(13, lfr.getOffset()); Assert.assertTrue(lfr.hasNext()); Assert.assertEquals(13, lfr.getOffset()); lfr.close(); } @Test public void testTruncatedChunkAndNoEOLInLast() throws Exception { Path file = createFile(Arrays.asList("Hello1")); LiveFile lf = new LiveFile(file); LiveFileReader lfr = new SingleLineLiveFileReader( LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.defaultCharset(), 0, 6); Assert.assertTrue(lfr.hasNext()); LiveFileChunk chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertTrue(chunk.isTruncated()); Assert.assertEquals(0, chunk.getOffset()); Assert.assertEquals(6, chunk.getLength()); Assert.assertEquals("Hello1", readChunk(chunk)); Assert.assertEquals(-6, lfr.getOffset()); Assert.assertTrue(lfr.hasNext()); Assert.assertEquals(-6, lfr.getOffset()); chunk = lfr.next(0); Assert.assertNull(chunk); Assert.assertEquals(-6, lfr.getOffset()); lfr.close(); } @Test public void testNextTimeout() throws Exception { Path file = createFile(Arrays.asList("Hello1")); LiveFile lf = new LiveFile(file); LiveFileReader lfr = new SingleLineLiveFileReader( LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.defaultCharset(), 0, 10); Assert.assertTrue(lfr.hasNext()); long start = System.currentTimeMillis(); LiveFileChunk chunk = lfr.next(10); Assert.assertNull(chunk); Assert.assertTrue(System.currentTimeMillis() - start >= 10); lfr.close(); } @Test public void testReadWithinTimeout() throws Exception { Path file = createFile(Arrays.asList("Hello1\n")); LiveFile lf = new LiveFile(file); LiveFileReader lfr = new SingleLineLiveFileReader( LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.defaultCharset(), 0, 10); Assert.assertTrue(lfr.hasNext()); long start = System.currentTimeMillis(); LiveFileChunk chunk = lfr.next(1000); Assert.assertNotNull(chunk); Assert.assertEquals("Hello1\n", readChunk(chunk)); Assert.assertTrue(System.currentTimeMillis() - start < 1000); lfr.close(); } @Test public void testCRLFLines() throws Exception { Path file = createFile(Arrays.asList("Hello1\r\n", "Hello\r\n")); LiveFile lf = new LiveFile(file); //multiple lines in one chunk LiveFileReader lfr = new SingleLineLiveFileReader( LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.defaultCharset(), 0, 20); Assert.assertTrue(lfr.hasNext()); LiveFileChunk chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertFalse(chunk.isTruncated()); Assert.assertEquals(0, chunk.getOffset()); Assert.assertEquals(15, chunk.getLength()); Assert.assertEquals("Hello1\r\nHello\r\n", readChunk(chunk)); Assert.assertEquals(15, lfr.getOffset()); //1.5 lines in one chunk lfr = new SingleLineLiveFileReader( LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.defaultCharset(), 0, 10); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertFalse(chunk.isTruncated()); Assert.assertEquals(0, chunk.getOffset()); Assert.assertEquals(8, chunk.getLength()); Assert.assertEquals("Hello1\r\n", readChunk(chunk)); Assert.assertEquals(8, lfr.getOffset()); chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertTrue(lfr.hasNext()); Assert.assertNotNull(chunk); Assert.assertFalse(chunk.isTruncated()); Assert.assertEquals(8, chunk.getOffset()); Assert.assertEquals(7, chunk.getLength()); Assert.assertEquals("Hello\r\n", readChunk(chunk)); Assert.assertEquals(15, lfr.getOffset()); //first line truncated after \r\n lfr = new SingleLineLiveFileReader( LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.defaultCharset(), 0, 8); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertFalse(chunk.isTruncated()); Assert.assertEquals(0, chunk.getOffset()); Assert.assertEquals(8, chunk.getLength()); Assert.assertEquals("Hello1\r\n", readChunk(chunk)); Assert.assertEquals(8, lfr.getOffset()); chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertTrue(lfr.hasNext()); Assert.assertNotNull(chunk); Assert.assertFalse(chunk.isTruncated()); Assert.assertEquals(8, chunk.getOffset()); Assert.assertEquals(7, chunk.getLength()); Assert.assertEquals("Hello\r\n", readChunk(chunk)); Assert.assertEquals(15, lfr.getOffset()); //first line truncated after \r lfr = new SingleLineLiveFileReader( LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), null, lf, Charset.defaultCharset(), 0, 7); Assert.assertTrue(lfr.hasNext()); chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertTrue(chunk.isTruncated()); Assert.assertEquals(0, chunk.getOffset()); Assert.assertEquals(7, chunk.getLength()); Assert.assertEquals("Hello1\r", readChunk(chunk)); Assert.assertEquals(-7, lfr.getOffset()); chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertTrue(lfr.hasNext()); Assert.assertNotNull(chunk); Assert.assertFalse(chunk.isTruncated()); Assert.assertEquals(8, chunk.getOffset()); Assert.assertEquals(7, chunk.getLength()); Assert.assertEquals("Hello\r\n", readChunk(chunk)); Assert.assertEquals(15, lfr.getOffset()); lfr.close(); } @Test public void testTag() throws Exception { Path file = createFile(Arrays.asList("Hello1\r\n", "Hello\r\n")); LiveFile lf = new LiveFile(file); //multiple lines in one chunk LiveFileReader lfr = new SingleLineLiveFileReader( LogRollModeFactory.REVERSE_COUNTER.get(file.getFileName().toString(), ""), "tag", lf, Charset.defaultCharset(), 0, 20); Assert.assertTrue(lfr.hasNext()); LiveFileChunk chunk = lfr.next(0); Assert.assertNotNull(chunk); Assert.assertEquals("tag", chunk.getTag()); lfr.close(); } }