Package net.sf.ehcache.pool.sizeof

Class SizeOf

  • Direct Known Subclasses:
    AgentSizeOf, ReflectionSizeOf, UnsafeSizeOf
    public abstract class SizeOf
extends java.lang.Object
    Abstract sizeOf for Java. It will rely on a proper sizeOf to measure sizes of entire object graphs
    Author:
    Alex Snaps

    • Constructor Summary

      Constructors 
      Constructor Description
      SizeOf​(SizeOfFilter fieldFilter, boolean caching)
      Builds a new SizeOf that will filter fields according to the provided filter

    • Method Summary

      All Methods Instance Methods Abstract Methods Concrete Methods 
      Modifier and Type Method Description
      Size deepSizeOf​(int maxDepth, boolean abortWhenMaxDepthExceeded, java.lang.Object... obj)
      Measures the size in memory (heap) of the objects passed in, walking their graph down Any overlap of the graphs being passed in will be recognized and only measured once
      abstract long sizeOf​(java.lang.Object obj)
      Calculates the size in memory (heap) of the instance passed in, not navigating the down graph

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • SizeOf

        public SizeOf​(SizeOfFilter fieldFilter,
              boolean caching)
        Builds a new SizeOf that will filter fields according to the provided filter
        Parameters:
        fieldFilter - The filter to apply
        caching - whether to cache reflected fields
        See Also:
        SizeOfFilter

    • Method Detail

      • sizeOf

        public abstract long sizeOf​(java.lang.Object obj)
        Calculates the size in memory (heap) of the instance passed in, not navigating the down graph
        Parameters:
        obj - the object to measure the size of
        Returns:
        the object size in memory in bytes

      • deepSizeOf

        public Size deepSizeOf​(int maxDepth,
                       boolean abortWhenMaxDepthExceeded,
                       java.lang.Object... obj)
        Measures the size in memory (heap) of the objects passed in, walking their graph down Any overlap of the graphs being passed in will be recognized and only measured once
        Parameters:
        maxDepth - maximum depth of the object graph to traverse
        abortWhenMaxDepthExceeded - true if the object traversal should be aborted when the max depth is exceeded
        obj - the root objects of the graphs to measure
        Returns:
        the total size in bytes for these objects
        See Also:
        sizeOf(Object)