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

Field Summary

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

Optional Element Summary

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

Field Details

BITS

static final String BITS

Unit for bits

See Also:

BYTES

static final String BYTES

Unit for bytes

See Also:

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"

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https://docs.oracle.com/en/java/javase/25/docs/api/jdk.jfr/jdk/jfr/DataAmount.html