ConcurrentGauge

```
@Inherited
 @Documented
 @Retention(value=RUNTIME)
 @Target(value={TYPE,CONSTRUCTOR,METHOD})
public @interface ConcurrentGauge
```
An annotation for marking a method, constructor, or class as concurrent gauged. The metric will be registered in the application MetricRegistry. A concurrent gauge has the following semantics:
- Upon entering the marked item, the value is increased.
- Upon exiting the marked item, the value is decreased.
Given a method annotated with @ConcurrentGauge like this:
```
      @ConcurrentGauge(name = "fancyName")
     public String fancyName(String name) {
         return "Sir Captain " + name;
     }
 
```
A concurrent gauge with the fully qualified class name + fancyName will be created and each time the #fancyName(String) method is invoked, the gauge will be updated. Similarly, the same applies for a constructor annotated with @ConcurrentGauge.
Given a class annotated with @ConcurrentGauge like this:
```
      @ConcurrentGauge
     public class CGaugedBean {
         public void cGaugedMethod1() {}
         public void cGaugedMethod2() {}
     }
 
```
A counter for the defining class will be created for each of the constructors/methods. Each time the constructor/method is invoked, the respective gauge will be updated. This annotation will throw an IllegalStateException if the constructor/method is invoked, but the metric no longer exists in the MetricRegistry.
Since:

2.0

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element and Description
`boolean`	`absolute` Denotes whether to use the absolute name or use the default given name relative to the annotated class.
`java.lang.String`	`description` The description of the concurrent gauge.
`java.lang.String`	`displayName` The display name of the concurrent gauge.
`java.lang.String`	`name` The name of the concurrent gauge.
`java.lang.String[]`	`tags` The tags of the concurrent gauge.
`java.lang.String`	`unit` The unit of the concurrent gauge.

- Element Detail
  - name
```
public abstract java.lang.String name
```
    The name of the concurrent gauge.
    
    Returns:
    
    The name of the concurrent gauge.
    
    Default:
    
    ""
- - tags
```
public abstract java.lang.String[] tags
```
    The tags of the concurrent gauge.
    
    Returns:
    
    The tags of the concurrent gauge. Each String tag must be in the form of 'key=value'. If the input is empty or does not contain a '=' sign, the entry is ignored.
    
    See Also:
    
    Metadata
    
    Default:
    
    {}
- - absolute
```
public abstract boolean absolute
```
    Denotes whether to use the absolute name or use the default given name relative to the annotated class.
    
    Returns:
    
    If true, use the given name as an absolute name. If false (default), use the given name relative to the annotated class. When annotating a class, this must be false.
    
    Default:
    
    false
- - displayName
```
public abstract java.lang.String displayName
```
    The display name of the concurrent gauge.
    
    Returns:
    
    The display name of the concurrent gauge.
    
    See Also:
    
    Metadata
    
    Default:
    
    ""
- - description
```
public abstract java.lang.String description
```
    The description of the concurrent gauge.
    
    Returns:
    
    The description of the concurrent gauge.
    
    See Also:
    
    Metadata
    
    Default:
    
    ""
- - unit
```
public abstract java.lang.String unit
```
    The unit of the concurrent gauge.
    
    Returns:
    
    The unit of the concurrent gauge. By default, the value is MetricUnits.NONE.
    
    See Also:
    
    Metadata, MetricUnits
    
    Default:
    
    "none"

Annotation Type ConcurrentGauge

Optional Element Summary

Element Detail

name

tags

absolute

displayName

description

unit