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/*
* Copyright (c) 2024, 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
* @requires vm.flavor != "zero"
* @modules java.base/jdk.internal.vm.annotation java.base/jdk.internal.misc
* @key randomness
* @run testng/othervm TestMappedHandshake
* @run testng/othervm -Xint TestMappedHandshake
* @run testng/othervm -XX:TieredStopAtLevel=1 TestMappedHandshake
* @run testng/othervm -XX:-TieredCompilation TestMappedHandshake
*/
import java.io.File;
import java.io.IOException;
import java.lang.foreign.Arena;
import java.lang.foreign.MemorySegment;
import java.nio.channels.FileChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import org.testng.annotations.Test;
import static org.testng.Assert.*;
public class TestMappedHandshake {
static final int SEGMENT_SIZE = 1_000_000;
static final int ACCESS_START_DELAY_MILLIS = 100;
static final int POST_ACCESS_DELAY_MILLIS = 1;
static final int TIMED_RUN_TIME_SECONDS = 10;
static final int MAX_EXECUTOR_WAIT_SECONDS = 20;
static final int NUM_ACCESSORS = 5;
static final Path tempPath;
static {
try {
File file = File.createTempFile("buffer", "txt");
file.deleteOnExit();
tempPath = file.toPath();
Files.write(file.toPath(), new byte[SEGMENT_SIZE], StandardOpenOption.WRITE);
} catch (IOException ex) {
throw new ExceptionInInitializerError(ex);
}
}
@Test
public void testHandshake() throws InterruptedException, IOException {
try (FileChannel fileChannel = FileChannel.open(tempPath, StandardOpenOption.READ, StandardOpenOption.WRITE) ;
Arena arena = Arena.ofShared()) {
MemorySegment segment = fileChannel.map(FileChannel.MapMode.READ_WRITE, 0L, SEGMENT_SIZE, arena);
ExecutorService accessExecutor = Executors.newFixedThreadPool(NUM_ACCESSORS + 1);
// start handshaker
accessExecutor.execute(new Handshaker());
Thread.sleep(ACCESS_START_DELAY_MILLIS);
// start accessors
for (int i = 0 ; i < NUM_ACCESSORS ; i++) {
accessExecutor.execute(new MappedSegmentAccessor(segment));
}
accessExecutor.shutdown();
assertTrue(accessExecutor.awaitTermination(MAX_EXECUTOR_WAIT_SECONDS, TimeUnit.SECONDS));
}
}
static abstract class TimedAction implements Runnable {
@Override
public void run() {
long start = System.currentTimeMillis();
while (true) {
try {
doAction();
} catch (Throwable ex) {
// ignore
} finally {
long elapsed = System.currentTimeMillis() - start;
if (elapsed > TIMED_RUN_TIME_SECONDS * 1000) {
break;
}
}
}
}
abstract void doAction() throws Throwable;
}
static class MappedSegmentAccessor extends TimedAction {
final MemorySegment segment;
MappedSegmentAccessor(MemorySegment segment) {
this.segment = segment;
}
@Override
void doAction() throws Throwable {
segment.load();
Thread.sleep(POST_ACCESS_DELAY_MILLIS);
segment.isLoaded();
Thread.sleep(POST_ACCESS_DELAY_MILLIS);
segment.unload();
Thread.sleep(POST_ACCESS_DELAY_MILLIS);
segment.force();
}
}
static class Handshaker extends TimedAction {
@Override
public void doAction() {
Arena.ofShared().close();
}
}
}
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