Class MemoryEstimator

java.lang.Object

com.loomcache.server.cache.MemoryEstimator

public class MemoryEstimator
extends Object

Estimates memory usage of cache entries and maps. Uses both shallow and deep estimates for accuracy.

Constructor Summary

Constructors

Constructor	Description
MemoryEstimator()

Method Summary

Modifier and Type	Method	Description
static <K,V> long	estimateConcurrentHashMapSize(ConcurrentHashMap<K,V> map)	Estimate memory for a ConcurrentHashMap.
static long	estimateEntrySize(Object key, Object value)	Estimate total memory for a single map entry (key + value + overhead).
static long	estimateMapSize(DistributedMap<?,?> map)	Estimate total memory consumption of a DistributedMap.
static <K,V> long	estimateMapSize(Map<K,V> map)	Estimate memory for a generic Map.
static long	estimateObjectSize(Object obj)	Estimate the size of a single object in bytes.

Methods inherited from class Object

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

Constructor Details

MemoryEstimator

public MemoryEstimator()

Method Details

estimateObjectSize

public static long estimateObjectSize(Object obj)

Estimate the size of a single object in bytes. Handles String, arrays, and generic objects.

estimateEntrySize

public static long estimateEntrySize(Object key,
 Object value)

Estimate total memory for a single map entry (key + value + overhead).

estimateMapSize

public static long estimateMapSize(DistributedMap<?,?> map)

Estimate total memory consumption of a DistributedMap.

estimateConcurrentHashMapSize

public static <K,V> long estimateConcurrentHashMapSize(ConcurrentHashMap<K,V> map)

Estimate memory for a ConcurrentHashMap.

estimateMapSize

public static <K,V> long estimateMapSize(Map<K,V> map)

Estimate memory for a generic Map.