CPUCircuitBreaker (Solr 9.0.0 core API)

java.lang.Object
- org.apache.solr.util.circuitbreaker.CircuitBreaker
- - org.apache.solr.util.circuitbreaker.CPUCircuitBreaker

```
public class CPUCircuitBreaker
extends CircuitBreaker
```
Tracks current CPU usage and triggers if the specified threshold is breached.
This circuit breaker gets the average CPU load over the last minute and uses that data to take a decision. We depend on OperatingSystemMXBean which does not allow a configurable interval of collection of data. //TODO: Use Codahale Meter to calculate the value locally.
The configuration to define which mode to use and the trigger threshold are defined in solrconfig.xml

Nested Class Summary
- Nested classes/interfaces inherited from class org.apache.solr.util.circuitbreaker.CircuitBreaker
  CircuitBreaker.CircuitBreakerConfig

Field Summary
- Fields inherited from class org.apache.solr.util.circuitbreaker.CircuitBreaker
  config, NAME

Constructor Summary

Constructors
Constructor Description

CPUCircuitBreaker(CircuitBreaker.CircuitBreakerConfig config)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected double`	`calculateLiveCPUUsage()`
`double`	`getCpuUsageThreshold()`
`String`	`getDebugInfo()`	Get debug useful info.
`String`	`getErrorMessage()`	Get error message when the circuit breaker triggers
`boolean`	`isTripped()`	Check if circuit breaker is tripped.

Methods inherited from class org.apache.solr.util.circuitbreaker.CircuitBreaker
isEnabled

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

- Constructor Detail
  - CPUCircuitBreaker
```
public CPUCircuitBreaker(CircuitBreaker.CircuitBreakerConfig config)
```
- Method Detail
  - isTripped
```
public boolean isTripped()
```
    Description copied from class: CircuitBreaker
    
    Check if circuit breaker is tripped.
    
    Specified by:
    
    isTripped in class CircuitBreaker
  - getDebugInfo
```
public String getDebugInfo()
```
    Description copied from class: CircuitBreaker
    
    Get debug useful info.
    
    Specified by:
    
    getDebugInfo in class CircuitBreaker
  - getErrorMessage
```
public String getErrorMessage()
```
    Description copied from class: CircuitBreaker
    
    Get error message when the circuit breaker triggers
    
    Specified by:
    
    getErrorMessage in class CircuitBreaker
  - getCpuUsageThreshold
```
public double getCpuUsageThreshold()
```
  - calculateLiveCPUUsage
```
protected double calculateLiveCPUUsage()
```