DataCacheInstrument (OpenJPA Parent POM 3.1.0 API)

All Known Subinterfaces:

DataCacheJMXInstrumentMBean

All Known Implementing Classes:

AbstractDataCacheInstrument, DataCacheJMXInstrument
```
public interface DataCacheInstrument
```
Interface for providing instrumented data cache metrics and operations.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`cache(String className, boolean enable)` This method is used to enable/disable caching for the specified className.
`void`	`clear()` Clears all data from the DataCache.
`void`	`collectStatistics(boolean enable)`
`String`	`getCacheName()` Returns the name of the cache
`Map<String,long[]>`	`getCacheStatistics()` Returns the CacheStatistics for the cache.
`long`	`getHitCount()` Returns the hit count since cache statistics were last reset
`long`	`getHitCount(String className)` Gets number of total read requests that has been found in cache for the given class since last reset.
`long`	`getReadCount()` Returns the read count since cache statistics were last reset
`long`	`getReadCount(String className)` Gets number of total read requests for the given class since last reset.
`Boolean`	`getStatisticsEnabled()` Returns true if cache statistics are currently being calculated.
`long`	`getTotalHitCount()` Returns the total hits since start.
`long`	`getTotalHitCount(String className)` Gets number of total read requests that has been found in cache for the given class since start.
`long`	`getTotalReadCount()` Returns the total reads since start.
`long`	`getTotalReadCount(String className)` Gets number of total read requests for the given class since start.
`long`	`getTotalWriteCount()` Returns the total writes since start.
`long`	`getTotalWriteCount(String className)` Gets number of total write requests for the given class since start.
`long`	`getWriteCount()` Returns the write count since cache statistics were last reset
`long`	`getWriteCount(String className)` Gets number of total write requests for the given class since last reset.
`Map<String,Boolean>`	`listKnownTypes()` Returns the names of classes that are known to the cache and whether or not they are currently being cached.
`void`	`reset()` Resets cache statistics
`Date`	`sinceDate()` Returns date since cache statistics collection were last reset.
`Date`	`startDate()` Returns date cache statistics collection started.

- Method Detail
  - getReadCount
```
long getReadCount(String className)
```
    Gets number of total read requests for the given class since last reset.
  - getHitCount
```
long getHitCount(String className)
```
    Gets number of total read requests that has been found in cache for the given class since last reset.
  - getWriteCount
```
long getWriteCount(String className)
```
    Gets number of total write requests for the given class since last reset.
  - getTotalReadCount
```
long getTotalReadCount(String className)
```
    Gets number of total read requests for the given class since start.
  - getTotalHitCount
```
long getTotalHitCount(String className)
```
    Gets number of total read requests that has been found in cache for the given class since start.
  - getTotalWriteCount
```
long getTotalWriteCount(String className)
```
    Gets number of total write requests for the given class since start.
  - getCacheName
```
String getCacheName()
```
    Returns the name of the cache
  - getHitCount
```
long getHitCount()
```
    Returns the hit count since cache statistics were last reset
  - getReadCount
```
long getReadCount()
```
    Returns the read count since cache statistics were last reset
  - getTotalHitCount
```
long getTotalHitCount()
```
    Returns the total hits since start.
  - getTotalReadCount
```
long getTotalReadCount()
```
    Returns the total reads since start.
  - getTotalWriteCount
```
long getTotalWriteCount()
```
    Returns the total writes since start.
  - getWriteCount
```
long getWriteCount()
```
    Returns the write count since cache statistics were last reset
  - reset
```
void reset()
```
    Resets cache statistics
  - sinceDate
```
Date sinceDate()
```
    Returns date since cache statistics collection were last reset.
  - startDate
```
Date startDate()
```
    Returns date cache statistics collection started.
  - listKnownTypes
```
Map<String,Boolean> listKnownTypes()
```
    Returns the names of classes that are known to the cache and whether or not they are currently being cached.
  - getStatisticsEnabled
```
Boolean getStatisticsEnabled()
```
    Returns true if cache statistics are currently being calculated. False otherwise.
  - collectStatistics
```
void collectStatistics(boolean enable)
```
    Parameters:
    
    enable - - If true, the cache will start collecting statistics. Else cache statistics will not be collected.
  - cache
```
void cache(String className,
           boolean enable)
```
    This method is used to enable/disable caching for the specified className.
  - getCacheStatistics
```
Map<String,long[]> getCacheStatistics()
```
    Returns the CacheStatistics for the cache. The format for this map is: Type(String) => Enabled(Boolean),Read(Long),Hit(Long),Write(Long)
  - clear
```
void clear()
```
    Clears all data from the DataCache.

Interface DataCacheInstrument

Method Summary

Method Detail

getReadCount

getHitCount

getWriteCount

getTotalReadCount

getTotalHitCount

getTotalWriteCount

getCacheName

getHitCount

getReadCount

getTotalHitCount

getTotalReadCount

getTotalWriteCount

getWriteCount

reset

sinceDate

startDate

listKnownTypes

getStatisticsEnabled

collectStatistics

cache

getCacheStatistics

clear