Quelle  TestFileStreamEvents.java

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package jdk.jfr.event.io;

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

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
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.Utils;
import jdk.test.lib.jfr.Events;

/**
 * @test TestFileStreamEvents
 * @key jfr
 * @requires vm.hasJFR
 * @library /test/lib /test/jdk
 * @run main/othervm jdk.jfr.event.io.TestFileStreamEvents
 */

public class TestFileStreamEvents {
    public static void main(String[] args) throws Throwable {
        File tmp = Utils.createTempFile("TestFileStreamEvents", ".tmp").toFile();
        try (Recording recording = new Recording()) {
            List<IOEvent> expectedEvents = new ArrayList<>();
            try(FileOutputStream fos = new FileOutputStream(tmp); FileInputStream fis = new FileInputStream(tmp);) {
                recording.enable(IOEvent.EVENT_FILE_READ).withThreshold(Duration.ofMillis(0));
                recording.enable(IOEvent.EVENT_FILE_WRITE).withThreshold(Duration.ofMillis(0));
                recording.start();

                int writeByte = 47;
                byte[] writeBuf = {11, 12, 13, 14};

                // Write
                fos.write(writeByte);
                expectedEvents.add(IOEvent.createFileWriteEvent(1, tmp));
                fos.write(writeBuf);
                expectedEvents.add(IOEvent.createFileWriteEvent(writeBuf.length, tmp));
                fos.write(writeBuf, 0, 2);
                expectedEvents.add(IOEvent.createFileWriteEvent(2, tmp));

                // Read
                int readByte = fis.read();
                assertEquals(readByte, writeByte, "Wrong byte read");
                expectedEvents.add(IOEvent.createFileReadEvent(1, tmp));

                byte[] readBuf = new byte[writeBuf.length];
                long size = fis.read(readBuf);
                assertEquals(size, (long)writeBuf.length, "Wrong size when reading byte[]");
                expectedEvents.add(IOEvent.createFileReadEvent(size, tmp));

                size = fis.read(readBuf, 0, 2);
                assertEquals(size, 2L, "Wrong size when reading 2 bytes");
                expectedEvents.add(IOEvent.createFileReadEvent(size, tmp));

                // We are at EOF. Read more and verify we get size -1.
                size = fis.read(readBuf);
                assertEquals(size, -1L, "Size should be -1 at EOF");
                expectedEvents.add(IOEvent.createFileReadEvent(size, tmp));

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