138 lines
4.7 KiB
Java
138 lines
4.7 KiB
Java
/*
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 4823133
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* @summary optimize RandomAccessFile.length() and length() is thread safe now.
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*/
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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/**
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*
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* @author vyom.tewari@oracle.com
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*/
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public class FileLengthTest {
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private static final int BUF_SIZE = 4096;
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private static RandomAccessFile randomAccessFile;
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private static Thread fileLengthCaller;
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private static Thread fileContentReader;
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private static StringBuilder fileContents;
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private static volatile boolean isFailed = false;
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/**
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* this thread will call length() in loop
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*/
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private static void startLengthThread() {
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if (randomAccessFile == null) {
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return;
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}
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fileLengthCaller = new Thread(() -> {
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while (true) {
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try {
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long length = randomAccessFile.length();
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if (length < 0) {
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return;
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}
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} catch (IOException ex) {
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return;
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}
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}
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});
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fileLengthCaller.setName("RandomAccessFile-length-caller");
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fileLengthCaller.setDaemon(true);
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fileLengthCaller.start();
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}
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/**
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* this thread will call read() and store the content in internal buffer.
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*/
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private static void startReaderThread() {
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if (randomAccessFile == null) {
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return;
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}
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fileContentReader = new Thread(() -> {
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StringBuilder sb = new StringBuilder(BUF_SIZE);
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int i;
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byte arr[] = new byte[8];
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try {
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while ((i = randomAccessFile.read(arr)) != -1) {
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sb.append(new String(arr, 0, i));
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}
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if (!sb.toString().equals(fileContents.toString())) {
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isFailed = true;
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}
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} catch (IOException ex) {
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}
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});
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fileContentReader.setName("RandomAccessFile-content-reader");
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fileContentReader.setDaemon(true);
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fileContentReader.start();
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}
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public static void main(String args[]) {
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byte arr[] = new byte[BUF_SIZE];
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String testFile = "testfile.txt";
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try {
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createDummyFile(testFile);
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File file = new File(testFile);
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file.deleteOnExit();
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randomAccessFile = new RandomAccessFile(file, "r");
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int count = randomAccessFile.read(arr);
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randomAccessFile.seek(0);
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fileContents = new StringBuilder(BUF_SIZE);
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fileContents.append(new String(arr, 0, count));
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startLengthThread();
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startReaderThread();
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fileContentReader.join();
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} catch (FileNotFoundException | InterruptedException ex) {
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} catch (IOException ex) {
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} finally {
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try {
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randomAccessFile.close();
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} catch (IOException ex) {
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}
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}
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if (isFailed) {
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throw new RuntimeException("RandomAccessFile.length() changed the underlying file pointer.");
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}
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}
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private static void createDummyFile(String fileName) throws FileNotFoundException, IOException {
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try (FileOutputStream outputStream = new FileOutputStream(new File(fileName))) {
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String str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
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int count = 0;
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while ((count + str.length()) < BUF_SIZE) {
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outputStream.write(str.getBytes());
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count += str.length();
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}
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outputStream.flush();
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}
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}
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}
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