MaxSampler (apache-cassandra API)

java.lang.Object
- org.apache.cassandra.metrics.Sampler<T>
- - org.apache.cassandra.metrics.MaxSampler<T>

```
public abstract class MaxSampler<T>
extends Sampler<T>
```
Note: Sampler.samplerExecutor is single threaded but we still need to synchronize as we have access from both internal and the external JMX context that can cause races.

Nested Class Summary
- Nested classes/interfaces inherited from class org.apache.cassandra.metrics.Sampler
  Sampler.Sample<S>, Sampler.SamplerType

Field Summary
- Fields inherited from class org.apache.cassandra.metrics.Sampler
  samplerExecutor

Constructor Summary

Constructors
Constructor Description

MaxSampler()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`beginSampling(int capacity, long durationMillis)`	Begin sampling with the configured capacity and duration
`java.util.List<Sampler.Sample<T>>`	`finishSampling(int count)`	Stop sampling and return the results
`protected void`	`insert(T item, long value)`

Methods inherited from class org.apache.cassandra.metrics.Sampler
addSample, disable, isActive, isEnabled, shutdownNowAndWait, toString, updateEndTime

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

- Constructor Detail
  - MaxSampler
```
public MaxSampler()
```
- Method Detail
  - beginSampling
```
public void beginSampling(int capacity,
                          long durationMillis)
```
    Description copied from class: Sampler
    
    Begin sampling with the configured capacity and duration
    
    Specified by:
    
    beginSampling in class Sampler<T>
    
    Parameters:
    
    capacity - Number of sample items to keep in memory, the lower this is the less accurate results are. For best results use value close to cardinality, but understand the memory trade offs.
    
    durationMillis - Upperbound duration in milliseconds for sampling. The sampler stops accepting new samples after exceeding the duration even if Sampler.finishSampling(int)} is not called.
  - finishSampling
```
public java.util.List<Sampler.Sample<T>> finishSampling(int count)
```
    Description copied from class: Sampler
    
    Stop sampling and return the results
    
    Specified by:
    
    finishSampling in class Sampler<T>
    
    Parameters:
    
    count - The number of the samples requested to retrieve from the sampler
    
    Returns:
    
    a list of samples, the size is the minimum of the total samples and {@param count}.
  - insert
```
protected void insert(T item,
                      long value)
```
    Specified by:
    
    insert in class Sampler<T>