MetricsRegistry (MapR Core Java API)

java.lang.Object
- com.mapr.org.apache.hadoop.metrics.util.MetricsRegistry

```
@LimitedPrivate({"HDFS","MapReduce"})
public class MetricsRegistry
extends java.lang.Object
```
This is the registry for metrics. Related set of metrics should be declared in a holding class and registered in a registry for those metrics which is also stored in the the holding class.

Constructor Summary

Constructors
Constructor Description

MetricsRegistry()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`add(java.lang.String metricsName, MetricsBase theMetricsObj)`	Add a new metrics to the registry
`MetricsBase`	`get(java.lang.String metricsName)`
`java.util.Collection<java.lang.String>`	`getKeyList()`
`java.util.Collection<MetricsBase>`	`getMetricsList()`
`int`	`size()`

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

- Constructor Detail
  - MetricsRegistry
```
public MetricsRegistry()
```
- Method Detail
  - size
```
public int size()
```
    Returns:
    
    number of metrics in the registry
  - add
```
public void add(java.lang.String metricsName,
                MetricsBase theMetricsObj)
```
    Add a new metrics to the registry
    
    Parameters:
    
    metricsName - - the name
    
    theMetricsObj - - the metrics
    
    Throws:
    
    java.lang.IllegalArgumentException - if a name is already registered
  - get
```
public MetricsBase get(java.lang.String metricsName)
```
    Parameters:
    
    metricsName -
    
    Returns:
    
    the metrics if there is one registered by the supplied name. Returns null if none is registered
  - getKeyList
```
public java.util.Collection<java.lang.String> getKeyList()
```
    Returns:
    
    the list of metrics names
  - getMetricsList
```
public java.util.Collection<MetricsBase> getMetricsList()
```
    Returns:
    
    the list of metrics