/**
* This tracks block hit and misses against the cache for this Directory only
*
* @param isHit true if recording a hit otherwise it's a miss
*/
public void recordBlockCacheHit(boolean isHit) {
if (isHit) {
long hits = hitCounter.incrementAndGet();
if (isHitRateLoggingEnabled() && hits % 5000 == 0) {
long misses = missCounter.get();
double hr = MTLRUCache.calculateHitRate(hits, misses);
int hrRounded = (int) (hr * 100);
boolean showHR = false;
// if its poor, show frequently
if (hr < 0.5) showHR = true;
else
// otherwise, show infrequently
if (hits % 20000 == 0) showHR = true;
if (showHR) {
int compRate = 0;
if (unCompressedTotal.get() != 0) {
compRate =
(int) (100.0 * (double) compressedTotal.get() / (double) unCompressedTotal.get());
}
logger.log(
Level.INFO,
"Hit rate for "
+ directoryName
+ " Directory is "
+ hrRounded
+ "%, total reads "
+ (hits + misses)
+ ", Compress Rate:"
+ compRate
+ "%");
}
}
} else missCounter.incrementAndGet();
}
/* (non-Javadoc)
* @see com.devwebsphere.wxslucene.jmx.LuceneDirectoryMBean#getBlockHitRate()
*/
@TabularAttribute(mbean = SummaryMBeanImpl.MONITOR_MBEAN)
public Double getBlockHitRate() {
if (blockLRUCache != null) return blockLRUCache.getHitRate();
else return 0.0;
}