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Java example source code file (Accordion.java)

This example Java source code file (Accordion.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

accordion, bytes, eof, exception, gzipinputstream, gzipoutputstream, non\-eof, pipedinputstream, pipedoutputstream, random, thread, throwable, unexpected, usage, util, zip

The Accordion.java Java example source code

/*
 * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/* @test
 * @bug 5092263
 * @summary GZIPInputStream o GZIPOutputStream === the identity stream
 * @author Martin Buchholz
*/

// To manually test for uncompressed streams larger than 2GB, do
// javac Accordion.java && java -server Accordion 3325349068
// javac Accordion.java && java -server Accordion 5470735564

import java.io.*;
import java.util.*;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

public class Accordion {
    private static void readFully(InputStream s, byte[] buf) throws Throwable {
        int pos = 0;
        int n;
        while ((n = s.read(buf, pos, buf.length-pos)) > 0)
            pos += n;
        if (pos != buf.length)
            throw new Exception("Unexpected EOF");
    }

    private static volatile Throwable trouble;

    public static void main(String[] args) throws Throwable {
        if (args.length > 1)
            throw new Exception("Usage: java Accordion [BYTES]");

        final long bytes = args.length == 0 ? 10001 : Long.parseLong(args[0]);
        final int bufsize = 1729;
        final long count = bytes/bufsize;
        final PipedOutputStream out = new PipedOutputStream();
        final PipedInputStream in = new PipedInputStream(out);
        final Random random = new Random();
        final byte[] data = new byte[1729];
        for (int i = 0; i < data.length; i++)
            data[i] = (byte)random.nextInt(255);
        System.out.println("count="+count);

        Thread compressor = new Thread() { public void run() {
            try (GZIPOutputStream s = new GZIPOutputStream(out)) {
                for (long i = 0; i < count; i++)
                    s.write(data, 0, data.length);
            } catch (Throwable t) { trouble = t; }}};

        Thread uncompressor = new Thread() { public void run() {
            try (GZIPInputStream s = new GZIPInputStream(in)) {
                final byte[] maybeBytes = new byte[data.length];
                for (long i = 0; i < count; i++) {
                    readFully(s, maybeBytes);
                    if (! Arrays.equals(data, maybeBytes))
                        throw new Exception("data corruption");
                }
                if (s.read(maybeBytes, 0, 1) > 0)
                    throw new Exception("Unexpected NON-EOF");
            } catch (Throwable t) { trouble = t; }}};

        compressor.start(); uncompressor.start();
        compressor.join();  uncompressor.join();

        if (trouble != null)
            throw trouble;
    }
}

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