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

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.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.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 = File.createTempFile("TestFileStreamEvents", ".tmp", new File("."));
        tmp.deleteOnExit();
        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);
        }
    }
}