test/jdk/jdk/jfr/event/io/TestFileChannelEvents.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * particular file as subject to the "Classpath" exception as provided
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 * 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).
 *
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package jdk.jfr.event.io;

import static jdk.test.lib.Asserts.assertEquals;

import java.io.File;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.time.Duration;
import java.util.ArrayList;
import java.util.List;

import jdk.jfr.Recording;
import jdk.jfr.consumer.RecordedEvent;
import jdk.test.lib.jfr.Events;

/**
 * @test
 * @key jfr
 * @requires vm.hasJFR
 * @library /test/lib /test/jdk
 * @run main/othervm jdk.jfr.event.io.TestFileChannelEvents
 */
public class TestFileChannelEvents {
    public static void main(String[] args) throws Throwable {
        File tmp = File.createTempFile("TestFileChannelEvents", ".tmp", new File("."));
        tmp.deleteOnExit();
        Recording recording = new Recording();
        List<IOEvent> expectedEvents = new ArrayList<>();

        try (RandomAccessFile rf = new RandomAccessFile(tmp, "rw"); FileChannel ch = rf.getChannel();) {
            recording.enable(IOEvent.EVENT_FILE_FORCE).withThreshold(Duration.ofMillis(0));
            recording.enable(IOEvent.EVENT_FILE_READ).withThreshold(Duration.ofMillis(0));
            recording.enable(IOEvent.EVENT_FILE_WRITE).withThreshold(Duration.ofMillis(0));
            recording.start();

            ByteBuffer bufA = ByteBuffer.allocateDirect(10);
            ByteBuffer bufB = ByteBuffer.allocateDirect(20);
            bufA.put("1234567890".getBytes());
            bufB.put("1234567890".getBytes());

            // test write(ByteBuffer)
            bufA.flip();
            long size = ch.write(bufA);
            expectedEvents.add(IOEvent.createFileWriteEvent(size, tmp));

            // test write(ByteBuffer, long)
            bufA.flip();
            size = ch.write(bufA, bufA.capacity() / 2);
            expectedEvents.add(IOEvent.createFileWriteEvent(size, tmp));

            // test write(ByteBuffer[])
            bufA.flip();
            bufA.limit(5);
            bufB.flip();
            bufB.limit(5);
            size = ch.write(new ByteBuffer[] { bufA, bufB });
            expectedEvents.add(IOEvent.createFileWriteEvent(size, tmp));

            // test force(boolean)
            ch.force(true);
            expectedEvents.add(IOEvent.createFileForceEvent(tmp));

            // reset file
            ch.position(0);

            // test read(ByteBuffer)
            bufA.clear();
            size = ch.read(bufA);
            expectedEvents.add(IOEvent.createFileReadEvent(size, tmp));

            // test read(ByteBuffer, long)
            bufA.clear();
            size = ch.read(bufA, bufA.capacity() / 2);
            expectedEvents.add(IOEvent.createFileReadEvent(size, tmp));

            // test read(ByteBuffer[])
            bufA.clear();
            bufA.limit(5);
            bufB.clear();
            bufB.limit(5);
            size = ch.read(new ByteBuffer[] { bufA, bufB });
            expectedEvents.add(IOEvent.createFileReadEvent(size, tmp));

            // Read at EOF. Should get size -1 in event.
            ch.position(ch.size());
            bufA.clear();
            size = ch.read(bufA);
            assertEquals(size, -1L, "Expected size -1 when read at EOF");
            expectedEvents.add(IOEvent.createFileReadEvent(size, tmp));

            ch.close();
            recording.stop();
            List<RecordedEvent> events = Events.fromRecording(recording);
            IOHelper.verifyEqualsInOrder(events, expectedEvents);
        }
    }
}