CacheStatsMBean (Jackrabbit Oak 1.44.0 API)

All Known Subinterfaces:

DataStoreCacheStatsMBean, PersistentCacheStatsMBean

All Known Implementing Classes:

AbstractCacheStats, CacheStats, CacheStatsMBeanWrapper, PersistentCacheStats, RecordCacheStats, SegmentCacheStats
```
@ProviderType
public interface CacheStatsMBean
```

Field Summary

Fields
Modifier and Type Field and Description

static java.lang.String TYPE

Fields
Modifier and Type	Field and Description
`static java.lang.String`	`TYPE`

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`java.lang.String`	`cacheInfoAsString()` Gathers the stats of the cache for logging.
`long`	`estimateCurrentWeight()` Total weight of the complete cache.
`double`	`getAverageLoadPenalty()` Returns the average time spent loading new values.
`long`	`getElementCount()` Get the number of elements/objects in the cache.
`long`	`getEvictionCount()` Returns the number of times an entry has been evicted.
`long`	`getHitCount()` Returns the number of times `com.google.common.cache.Cache` lookup methods have returned a cached value.
`double`	`getHitRate()` Returns the ratio of cache requests which were hits.
`long`	`getLoadCount()` Returns the total number of times that `com.google.common.cache.Cache` lookup methods attempted to load new values.
`long`	`getLoadExceptionCount()` Returns the number of times `com.google.common.cache.Cache` lookup methods threw an exception while loading a new value.
`double`	`getLoadExceptionRate()` Returns the ratio of cache loading attempts which threw exceptions.
`long`	`getLoadSuccessCount()` Returns the number of times `com.google.common.cache.Cache` lookup methods have successfully loaded a new value.
`long`	`getMaxTotalWeight()` The maximum weight of entries the cache may contain.
`long`	`getMissCount()` Returns the number of times `com.google.common.cache.Cache` lookup methods have returned an uncached (newly loaded) value, or null.
`double`	`getMissRate()` Returns the ratio of cache requests which were misses.
`java.lang.String`	`getName()`
`long`	`getRequestCount()` Returns the number of times `com.google.common.cache.Cache` lookup methods have returned either a cached or uncached value.
`long`	`getTotalLoadTime()` Returns the total number of nanoseconds the cache has spent loading new values.
`void`	`resetStats()` Reset the cache stats

- Field Detail
  - TYPE
```
static final java.lang.String TYPE
```
    See Also:
    
    Constant Field Values
- Method Detail
  - getName
```
java.lang.String getName()
```
  - getRequestCount
```
long getRequestCount()
```
    Returns the number of times com.google.common.cache.Cache lookup methods have returned either a cached or uncached value. This is defined as getHitCount + getMissCount.
  - getHitCount
```
long getHitCount()
```
    Returns the number of times com.google.common.cache.Cache lookup methods have returned a cached value.
  - getHitRate
```
double getHitRate()
```
    Returns the ratio of cache requests which were hits. This is defined as getHitCount / getRequestCount, or 1.0 when getRequestCount == 0. Note that getHitRate + getMissRate =~ 1.0.
  - getMissCount
```
long getMissCount()
```
    Returns the number of times com.google.common.cache.Cache lookup methods have returned an uncached (newly loaded) value, or null. Multiple concurrent calls to com.google.common.cache.Cache lookup methods on an absent value can result in multiple misses, all returning the results of a single cache load operation.
  - getMissRate
```
double getMissRate()
```
    Returns the ratio of cache requests which were misses. This is defined as getMissCount / getRequestCount, or 0.0 when getRequestCount == 0. Note that getHitRate + getMissRate =~ 1.0. Cache misses include all requests which weren't cache hits, including requests which resulted in either successful or failed loading attempts, and requests which waited for other threads to finish loading. It is thus the case that getMissCount >= getLoadSuccessCount + getLoadExceptionCount. Multiple concurrent misses for the same key will result in a single load operation.
  - getLoadCount
```
long getLoadCount()
```
    Returns the total number of times that com.google.common.cache.Cache lookup methods attempted to load new values. This includes both successful load operations, as well as those that threw exceptions. This is defined as getLoadSuccessCount + getLoadExceptionCount.
  - getLoadSuccessCount
```
long getLoadSuccessCount()
```
    Returns the number of times com.google.common.cache.Cache lookup methods have successfully loaded a new value. This is always incremented in conjunction with getMissCount(), though getMissCount is also incremented when an exception is encountered during cache loading (see getLoadExceptionCount()). Multiple concurrent misses for the same key will result in a single load operation.
  - getLoadExceptionCount
```
long getLoadExceptionCount()
```
    Returns the number of times com.google.common.cache.Cache lookup methods threw an exception while loading a new value. This is always incremented in conjunction with getMissCount, though getMissCount is also incremented when cache loading completes successfully (see getLoadSuccessCount()). Multiple concurrent misses for the same key will result in a single load operation.
  - getLoadExceptionRate
```
double getLoadExceptionRate()
```
    Returns the ratio of cache loading attempts which threw exceptions. This is defined as getLoadExceptionCount / (getLoadSuccessCount + getLoadExceptionCount), or 0.0 when getLoadSuccessCount + getLoadExceptionCount == 0.
  - getTotalLoadTime
```
long getTotalLoadTime()
```
    Returns the total number of nanoseconds the cache has spent loading new values. This can be used to calculate the miss penalty. This value is increased every time getLoadSuccessCount or getLoadExceptionCount is incremented.
  - getAverageLoadPenalty
```
double getAverageLoadPenalty()
```
    Returns the average time spent loading new values. This is defined as getTotalLoadTime / (getLoadSuccessCount + getLoadExceptionCount).
  - getEvictionCount
```
long getEvictionCount()
```
    Returns the number of times an entry has been evicted. This count does not include manual com.google.common.cache.Cache#invalidate invalidations.
  - getElementCount
```
long getElementCount()
```
    Get the number of elements/objects in the cache.
    
    Returns:
    
    the number of elements
  - getMaxTotalWeight
```
long getMaxTotalWeight()
```
    The maximum weight of entries the cache may contain.
    
    Returns:
    
    the maximum total weight of entries the cache may contain
  - estimateCurrentWeight
```
long estimateCurrentWeight()
```
    Total weight of the complete cache. Depending on implementation it might be the amount of RAM taken by the cache
    
    Returns:
    
    to weight of the cache
  - cacheInfoAsString
```
java.lang.String cacheInfoAsString()
```
    Gathers the stats of the cache for logging.
  - resetStats
```
void resetStats()
```
    Reset the cache stats

Interface CacheStatsMBean

Field Summary

Method Summary

Field Detail

TYPE

Method Detail

getName

getRequestCount

getHitCount

getHitRate

getMissCount

getMissRate

getLoadCount

getLoadSuccessCount

getLoadExceptionCount

getLoadExceptionRate

getTotalLoadTime

getAverageLoadPenalty

getEvictionCount

getElementCount

getMaxTotalWeight

estimateCurrentWeight

cacheInfoAsString

resetStats