ConcurrentCacheMBeanImpl (Apache Derby V10.14 Internals)

java.lang.Object
- org.apache.derby.impl.services.cache.ConcurrentCacheMBeanImpl

All Implemented Interfaces:

CacheManagerMBean
```
final class ConcurrentCacheMBeanImpl
extends java.lang.Object
implements CacheManagerMBean
```
This class provides monitoring capabilities for ConcurrentCache through Java Management Extension (JMX).

Field Summary

Fields
Modifier and Type Field Description

private ConcurrentCache cache

Fields
Modifier and Type	Field	Description
`private ConcurrentCache`	`cache`

Constructor Summary

Constructors
Constructor Description

ConcurrentCacheMBeanImpl(ConcurrentCache cache)

Constructors
Constructor	Description
`ConcurrentCacheMBeanImpl(ConcurrentCache cache)`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`private static void`	`checkPermission()`
`long`	`getAllocatedEntries()`	Get the number of entries currently allocated in the cache.
`boolean`	`getCollectAccessCounts()`	Check if collection of cache access counts is enabled.
`long`	`getEvictionCount()`	Get the number of cached objects that have been evicted from the cache in order to make room for other objects.
`long`	`getHitCount()`	Get the number of cache accesses where the requested object was already in the cache.
`long`	`getMaxEntries()`	Get the maximum number of entries that could be held by this cache.
`long`	`getMissCount()`	Get the number of cache accesses where the requested object was not already in the cache.
`long`	`getUsedEntries()`	Get the number of objects that are currently in the cache.
`void`	`setCollectAccessCounts(boolean collect)`	Enable or disable collection of cache access counts.

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

- Field Detail
  - cache
```
private final ConcurrentCache cache
```
- Constructor Detail
  - ConcurrentCacheMBeanImpl
```
ConcurrentCacheMBeanImpl(ConcurrentCache cache)
```
- Method Detail
  - setCollectAccessCounts
```
public void setCollectAccessCounts(boolean collect)
```
    Description copied from interface: CacheManagerMBean
    
    Enable or disable collection of cache access counts. That is, whether or not each hit, miss and eviction should be counted. Enabling it might impose a small overhead on cache accesses, and might reduce the system performance. Access counts are disabled by default.
    
    Specified by:
    
    setCollectAccessCounts in interface CacheManagerMBean
    
    Parameters:
    
    collect - true if access counts should be collected, or false otherwise
    
    See Also:
    
    CacheManagerMBean.getCollectAccessCounts(), CacheManagerMBean.getHitCount(), CacheManagerMBean.getMissCount(), CacheManagerMBean.getEvictionCount()
  - getCollectAccessCounts
```
public boolean getCollectAccessCounts()
```
    Description copied from interface: CacheManagerMBean
    
    Check if collection of cache access counts is enabled.
    
    Specified by:
    
    getCollectAccessCounts in interface CacheManagerMBean
    
    Returns:
    
    true if access counts are enabled, false otherwise
    
    See Also:
    
    CacheManagerMBean.setCollectAccessCounts(boolean)
  - getHitCount
```
public long getHitCount()
```
    Description copied from interface: CacheManagerMBean
    
    Get the number of cache accesses where the requested object was already in the cache.
    
    Specified by:
    
    getHitCount in interface CacheManagerMBean
    
    Returns:
    
    the number of cache hits
  - getMissCount
```
public long getMissCount()
```
    Description copied from interface: CacheManagerMBean
    
    Get the number of cache accesses where the requested object was not already in the cache.
    
    Specified by:
    
    getMissCount in interface CacheManagerMBean
    
    Returns:
    
    the number of cache misses
  - getEvictionCount
```
public long getEvictionCount()
```
    Description copied from interface: CacheManagerMBean
    
    Get the number of cached objects that have been evicted from the cache in order to make room for other objects.
    
    Specified by:
    
    getEvictionCount in interface CacheManagerMBean
    
    Returns:
    
    the number of evicted objects
  - getMaxEntries
```
public long getMaxEntries()
```
    Description copied from interface: CacheManagerMBean
    
    Get the maximum number of entries that could be held by this cache.
    
    Specified by:
    
    getMaxEntries in interface CacheManagerMBean
    
    Returns:
    
    the maximum number of entries in the cache
  - getAllocatedEntries
```
public long getAllocatedEntries()
```
    Description copied from interface: CacheManagerMBean
    
    Get the number of entries currently allocated in the cache. This number includes entries for objects that have been removed from the cache, whose entries have not yet been reused for other objects.
    
    Specified by:
    
    getAllocatedEntries in interface CacheManagerMBean
    
    Returns:
    
    the number of entries in the cache
  - getUsedEntries
```
public long getUsedEntries()
```
    Description copied from interface: CacheManagerMBean
    
    Get the number of objects that are currently in the cache.
    
    Specified by:
    
    getUsedEntries in interface CacheManagerMBean
    
    Returns:
    
    the number of objects in the cache
  - checkPermission
```
private static void checkPermission()
```

Class ConcurrentCacheMBeanImpl

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

cache

Constructor Detail

ConcurrentCacheMBeanImpl

Method Detail

setCollectAccessCounts

getCollectAccessCounts

getHitCount

getMissCount

getEvictionCount

getMaxEntries

getAllocatedEntries

getUsedEntries

checkPermission