test/jdk/jdk/jfr/api/recording/misc/TestGetSize.java

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package jdk.jfr.api.recording.misc;

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

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import jdk.jfr.Recording;
import jdk.test.lib.jfr.EventNames;

/*
 * @test
 * @summary Test recording file size with Recording.getSize()
 * @key jfr
 * @library /test/lib
 * @run main/othervm jdk.jfr.api.recording.misc.TestGetSize
 */
public class TestGetSize {

    public static void main(String[] args) throws Throwable {
        Path dest = Paths.get(".", "my.jfr");
        Recording r = new Recording();
        r.setToDisk(true);
        r.enable(EventNames.OSInformation);
        assertEquals(r.getSize(), 0L, "getSize should return 0 before recording starts");
        r.start();
        r.stop();
        r.dump(dest);
        assertTrue(Files.exists(dest), "TestGetSize recording missing: " + dest);
        System.out.printf("%s size: %d%n", dest, Files.size(dest));
        System.out.printf("r.getSize(): %d%n", r.getSize());
        assertEquals(Files.size(dest), r.getSize(), "TestGetSize wrong recording size");
        r.close();
    }

}