FunctionCollectorRegistry (Pulsar Functions :: Instance 2.10.1.10-rc-arrowstreet API)

java.lang.Object
- io.prometheus.client.CollectorRegistry
- - org.apache.pulsar.functions.instance.stats.FunctionCollectorRegistry

Direct Known Subclasses:

FunctionCollectorRegistryImpl
```
public abstract class FunctionCollectorRegistry
extends io.prometheus.client.CollectorRegistry
```
Internal representation of Prometheus Collector Registry

Field Summary
- Fields inherited from class io.prometheus.client.CollectorRegistry
  defaultRegistry

Constructor Summary

Constructors
Constructor Description

FunctionCollectorRegistry()

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`static FunctionCollectorRegistry`	`getDefaultImplementation()`
`abstract <T extends io.prometheus.client.Collector> T`	`registerIfNotExist(java.lang.String metricName, T collector)`	Register a metric if it does not yet exist.

Methods inherited from class io.prometheus.client.CollectorRegistry
clear, filteredMetricFamilySamples, getSampleValue, getSampleValue, metricFamilySamples, register, unregister

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - FunctionCollectorRegistry
```
public FunctionCollectorRegistry()
```
- Method Detail
  - getDefaultImplementation
```
public static FunctionCollectorRegistry getDefaultImplementation()
```
  - registerIfNotExist
```
public abstract <T extends io.prometheus.client.Collector> T registerIfNotExist(java.lang.String metricName,
                                                                                T collector)
```
    Register a metric if it does not yet exist. If it does exist, then return the existing metric. Currently, only needed by the LocalRunner when running in threaded and exposing metrics via a http server. This method helps resolve the conflict in which multiple instances within the LocalRunner process try to register the same metric.
    
    Type Parameters:
    
    T -
    
    Parameters:
    
    metricName - the name of the metric
    
    collector - the metric object e.g. Count, Gauge, etc.
    
    Returns:
    
    If the metric with the name `metricName` already exists, return the existing metric object. If not, return null