Package com.ibm.wsspi.cache

Interface CacheStatistics

public interface CacheStatistics
This interface is used to monitor the cache. It is utilized by the WebSphere Cache Monitor application shipped as a part of the WAS install image to administer and monitor the contents of the CoreCache
Since:
WAS7.0

  • Method Details

    • getCacheHitsCount

      long getCacheHitsCount()
      Statistics name: CacheHits

      Description: The total number of cache hits.

      Returns:
      The total number of cache hits.

    • getCacheLruRemovesCount

      long getCacheLruRemovesCount()
      Statistics name: CacheLruRemoves

      Description: The number of memory-based least recently used (LRU) evictions. These correspond to the number of objects that are evicted from the memory cache, based on the LRU policy.

      Returns:
      The number of objects that are removed by LRU evictions

    • getCacheMissesCount

      long getCacheMissesCount()
      Statistics name: CacheMisses

      Description: The total number of cache misses.

      Returns:
      The total number of cache misses.

    • getCacheRemovesCount

      long getCacheRemovesCount()
      Statistics name: CacheRemoves

      Description: The total number of cache removes.

      Returns:
      The total number of cache removes.

    • getExplicitInvalidationsFromMemoryCount

      long getExplicitInvalidationsFromMemoryCount()
      Statistics name: ExplicitInvalidationsFromMemory

      Description: Metric that captures the number of explicit invalidations that result in an entry being removed from memory.

      Returns:
      The total number of explicitly triggered invalidations from memory.

    • getExtendedStats

      Map<String,Number> getExtendedStats()
      Extended cache statistics specific to the cache provider
      Returns:
      Map of {cache statistic name --> Cache statistic value}

    • getMemoryCacheEntriesCount

      long getMemoryCacheEntriesCount()
      Statistics name: MemoryCacheEntries

      Description: The number of cache entries in memory.

      Returns:
      The number of cache entries in memory.

    • getMemoryCacheSizeInMBCount

      float getMemoryCacheSizeInMBCount()
      Statistics name: MemoryCacheSizeInMB

      Description: The size of the cache in terms of memory occupied on the JVM heap.

      Returns:
      The amount of JVM heap in MB occupied by the cache

    • getTimeoutInvalidationsFromMemoryCount

      long getTimeoutInvalidationsFromMemoryCount()
      Statistics name: TimeoutInvalidationsFromMemory

      Description: Metric that captures the number of timeout invalidations that result in an entry being removed from memory.

      Returns:
      The total number of timeout invalidations from memory.

    • reset

      void reset()
      This is used to reset all statistics counters in the cache proivder excluding:
      1. MemoryCacheEntries
      2. MemoryCacheSizeInMB