Interface CacheStatsMBean

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static String TYPE  
    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      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 org.apache.jackrabbit.guava.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 org.apache.jackrabbit.guava.common.cache.Cache lookup methods attempted to load new values.
      long getLoadExceptionCount()
      Returns the number of times org.apache.jackrabbit.guava.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 org.apache.jackrabbit.guava.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 org.apache.jackrabbit.guava.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.
      String getName()  
      long getRequestCount()
      Returns the number of times org.apache.jackrabbit.guava.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
    • Method Detail

      • getRequestCount

        long getRequestCount()
        Returns the number of times org.apache.jackrabbit.guava.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 org.apache.jackrabbit.guava.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 org.apache.jackrabbit.guava.common.cache.Cache lookup methods have returned an uncached (newly loaded) value, or null. Multiple concurrent calls to org.apache.jackrabbit.guava.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 org.apache.jackrabbit.guava.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 org.apache.jackrabbit.guava.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 org.apache.jackrabbit.guava.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 org.apache.jackrabbit.guava.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

        String cacheInfoAsString()
        Gathers the stats of the cache for logging.
      • resetStats

        void resetStats()
        Reset the cache stats