com.hazelcast.internal.metrics

Annotation Type Probe

@Retention(value=RUNTIME)
@Target(value={FIELD,METHOD})
public @interface Probe

Annotation that can be placed on a field or method of an object to indicate that it should be tracked by the MetricsRegistry when the MetricsRegistry.scanAndRegister(Object, String) is called. The MetricsRegistry will automatically scan all interfaces and super classes of an object (recursively). So it is possible to define a Gauge on e.g. an interface or abstract class.

Prefer field

Prefer placing a Gauge to a field above a method if the type is a primitive. The Field provides access to the actual field without the need for autoboxing. With the Method a wrapper object is created when a primitive is returned by the method. Therefor fields produce less garbage than methods. A Gauge can be placed on field or methods with the following (return) type:

1. byte
2. short
3. int
4. float
5. long
6. double
7. AtomicInteger
8. AtomicLong
9. Counter
10. Byte
11. Short
12. Integer
13. Float
14. Double
15. Collection: it will return the size
16. Map: it will return the size

If the field or method points to a null reference, it is interpreted as 0.

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
String	name The name of the gauge.

Element Detail

name

public abstract String name

The name of the gauge. By default, the name of the field or method is used.

Returns:

the name of the gauge.

Default:

""