test/jdk/java/io/ByteArrayInputStream/ChunkedTransferTo.java - master - githubmirror/jdk21u

test/jdk/java/io/ByteArrayInputStream/ChunkedTransferTo.java
72 строки3 KB
Brian Burkhalter
8316156: ByteArrayInputStream.transferTo causes MaxDirectMemorySize overflow
04 окт 2023, 20:38
04 окт 2023, 20:38834c45c
/*
 * Copyright (c) 2023, 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 8316156
 * @summary Ensure ByteArrayInputStream.transferTo does not cause direct memory
 *          to overflow MaxDirectMemorySize
 * @run junit/othervm -XX:MaxDirectMemorySize=5M ChunkedTransferTo
 */

import java.io.ByteArrayInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;
import java.util.Random;

import static java.nio.file.StandardCopyOption.REPLACE_EXISTING;
import static java.nio.file.StandardOpenOption.*;

import org.junit.jupiter.api.Test;

public class ChunkedTransferTo {
    // this value must exceed MaxDirectMemorySize
    private static final int SIZE = 10_000_000;

    @Test
    public void byteArrayInputStream() throws IOException {
        byte[] src = new byte[SIZE];
        Random rnd = new Random(System.nanoTime());
        rnd.nextBytes(src);
        try (ByteArrayInputStream bais = new ByteArrayInputStream(src)) {
            Path target = Files.createTempFile("SNA", "FU");
            FileChannel fc = FileChannel.open(target, CREATE, WRITE);
            bais.transferTo(Channels.newOutputStream(fc));
            byte[] dst = new byte[SIZE + 1];
            try (FileInputStream fis = new FileInputStream(target.toFile())) {
                int n = -1;
                if ((n = fis.read(dst)) != SIZE)
                    throw new RuntimeException(n + " != " + SIZE);
            }
            Files.delete(target);
            if (!Arrays.equals(src, 0, SIZE, dst, 0, SIZE))
                throw new RuntimeException("Arrays are not equal");
        } catch (OutOfMemoryError oome) {
            throw new RuntimeException(oome);
        }
    }
}