Module jdk.jfr
Package jdk.jfr

Annotation Interface DataAmount

@Retention(RUNTIME) @Target({FIELD,TYPE,METHOD}) public @interface DataAmount
Event field annotation, specifies that a value represents an amount of data (for example, bytes).

The following example shows how the DataAmount annotation can be used to set the units BITS and BYTES to event fields. 

@Name("com.example.ImageRender")
@Label("Image Render")
public class ImageRender extends Event {
    @Label("Height")
    long height;

    @Label("Width")
    long width;

    @Label("Color Depth")
    @DataAmount(DataAmount.BITS)
    int colorDepth;

    @Label("Memory Size")
    @DataAmount // bytes by default
    long memorySize;
}
Since:
9

  • Optional Element Summary

    Optional Elements
    Modifier and Type
    Optional Element
    Description
    String
    value
    Returns the unit for the data amount, by default bytes.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final String
    BITS
    Unit for bits
    static final String
    BYTES
    Unit for bytes

  • Field Details

  • Element Details

    • value

      String value
      Returns the unit for the data amount, by default bytes.
      Returns:
      the data amount unit, default BYTES, not null
      Default:
      "BYTES"