test/jdk/java/nio/MappedByteBuffer/ForceViews.java - master - githubmirror/panama-vector

test/jdk/java/nio/MappedByteBuffer/ForceViews.java
106 строк4 KB
Brian Burkhalter
8378808: Refactor java/nio/Buffer TestNG tests to use JUnit
10 мар 2026, 21:44
10 мар 2026, 21:4473b13f9
/*
 * Copyright (c) 2021, 2026, 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 4833719
 * @summary Verify MappedByteBuffer force on compact, duplicate, and slice views
 * @run junit ForceViews
 */
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import java.nio.ReadOnlyBufferException;
import java.nio.channels.FileChannel;
import java.nio.file.Path;
import java.util.function.BiFunction;
import java.util.stream.Stream;

import static java.nio.channels.FileChannel.MapMode.*;
import static java.nio.file.StandardOpenOption.*;

import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;

import static org.junit.jupiter.api.Assertions.assertEquals;

public class ForceViews {

    static record Segment(int position, int length) {}

    public static Stream<Arguments> provider() throws IOException {
        BiFunction<MappedByteBuffer,Segment,MappedByteBuffer> absSlice =
            (m, s) -> { return m.slice(s.position, s.length); };
        BiFunction<MappedByteBuffer,Segment,MappedByteBuffer> relSlice =
            (m, s) -> { m.position(s.position); m.limit(s.position + s.length);
                        return m.slice(); };
        BiFunction<MappedByteBuffer,Segment,MappedByteBuffer> duplicate=
            (m, s) -> { return m.duplicate(); };
        BiFunction<MappedByteBuffer,Segment,MappedByteBuffer> compact =
            (m, s) -> { return m.compact(); };

        return Stream.of
            (Arguments.of("Absolute slice", 256, 512, 128, 128, 32, 32, absSlice),
             Arguments.of("Relative slice", 256, 512, 0, 128, 32, 32, relSlice),
             Arguments.of("Duplicate", 256, 512, 0, 256, 32, 32, duplicate),
             Arguments.of("Compact", 256, 512, 0, 256, 32, 32, compact));
    }

    @ParameterizedTest
    @MethodSource("provider")
    public void test(String tst, int mapPosition, int mapLength,
                     int sliceIndex, int sliceLength, int regionOffset,
                     int regionLength,
                     BiFunction<MappedByteBuffer,Segment,MappedByteBuffer> f)
        throws Exception {

        Path file = Path.of(".", "junk");
        try (FileChannel fc = FileChannel.open(file, CREATE, READ, WRITE, DELETE_ON_CLOSE)) {
            fc.write(ByteBuffer.wrap(new byte[1024]));
            fc.position(0);

            MappedByteBuffer mbb = fc.map(READ_WRITE, mapPosition, mapLength);
            mbb = f.apply(mbb, new Segment(sliceIndex, sliceLength));
            for (int i = regionOffset; i < regionOffset + regionLength; i++) {
                mbb.put(i, (byte)i);
            }
            mbb.force(regionOffset, regionOffset + regionLength);

            int fcPos = mapPosition + sliceIndex + regionOffset;
            int mbbPos = regionOffset;
            int length = regionLength;

            ByteBuffer buf = ByteBuffer.allocate(length);
            fc.position(fcPos);
            fc.read(buf);
            for (int i = 0; i < length; i++) {
                int fcVal = buf.get(i);
                int mbbVal = mbb.get(mbbPos + i);
                int val = regionOffset + i;
                assertEquals(val, fcVal);
                assertEquals(val, mbbVal);
            }
        }
    }
}