kodo.datacache
Class MonitoringQueryCache

java.lang.Object
  org.apache.openjpa.datacache.DelegatingQueryCache
      kodo.datacache.MonitoringQueryCache

All Implemented Interfaces:

StatisticsProvider, QueryCache, TypesChangedListener, Closeable

public class MonitoringQueryCache
extends DelegatingQueryCache
implements StatisticsProvider

Delegating query cache that provides monitoring statistics.

Constructor Summary

MonitoringQueryCache(OpenJPAConfiguration conf, QueryCache cache)
Provide delegate on construction.

Method Summary

void	close()
QueryResult	get(QueryKey key)
double	getHitRate() Returns the percentage of hits.
int	getHits() Returns the number of cache hits for invocations of the get(org.apache.openjpa.datacache.QueryKey) method.
int	getMisses() Returns the number of cache misses for invocations of the get(org.apache.openjpa.datacache.QueryKey) method.
Collection	getStatistics() Get statistics exported by this object.
String	getStatisticsString() Returns a localized string containing the number of hits, the number of misses, and the hit ratio (hits / (hits+misses)).
void	resetStatistics() Reset the caching statistics.

Methods inherited from class org.apache.openjpa.datacache.DelegatingQueryCache

addTypesChangedListener, clear, equals, getDelegate, getInnermostDelegate, hashCode, initialize, onTypesChanged, pin, put, remove, removeTypesChangedListener, translate, unpin, writeLock, writeUnlock

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MonitoringQueryCache

public MonitoringQueryCache(OpenJPAConfiguration conf,
                            QueryCache cache)

Provide delegate on construction.

Method Detail

getHits

public int getHits()

Returns the number of cache hits for invocations of the get(org.apache.openjpa.datacache.QueryKey) method.

getMisses

public int getMisses()

Returns the number of cache misses for invocations of the get(org.apache.openjpa.datacache.QueryKey) method.

getHitRate

public double getHitRate()

Returns the percentage of hits.

getStatisticsString

public String getStatisticsString()

Returns a localized string containing the number of hits, the number of misses, and the hit ratio (hits / (hits+misses)).

getStatistics

public Collection getStatistics()

Get statistics exported by this object.

Specified by:

getStatistics in interface StatisticsProvider

resetStatistics

public void resetStatistics()

Reset the caching statistics.

get

public QueryResult get(QueryKey key)

Specified by:

get in interface QueryCache

Overrides:

get in class DelegatingQueryCache

close

public void close()

Specified by:

close in interface QueryCache

Specified by:

close in interface Closeable

Overrides:

close in class DelegatingQueryCache