Package org.apache.ivy.util

Class MemoryUtil

java.lang.Object
org.apache.ivy.util.MemoryUtil
public final class MemoryUtil extends Object
Memory related utilities.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    private static final int
    SAMPLING_SIZE
     
    private static final int
    SLEEP_TIME
     

  • Constructor Summary

    Constructors
    Modifier
    Constructor
    Description
    private
    MemoryUtil()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    private static void
    gc()
     
    static long
    getUsedMemory()
    Returns the currently used memory, after calling garbage collector and waiting enough to get maximal chance it is actually called.
    static void
    main(String[] args)
     
    static long
    sizeOf(Class<?> clazz)
    Returns the approximate size of a default instance of the given class.

    Methods inherited from class java.lang.Object

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

  • Field Details

  • Constructor Details

    • MemoryUtil

      private MemoryUtil()

  • Method Details

    • sizeOf

      public static long sizeOf(Class<?> clazz)
      Returns the approximate size of a default instance of the given class.
      Parameters:
      clazz - the class to evaluate.
      Returns:
      the estimated size of instance, in bytes.

    • getUsedMemory

      public static long getUsedMemory()
      Returns the currently used memory, after calling garbage collector and waiting enough to get maximal chance it is actually called. But since Runtime.gc() is only advisory, results returned by this method should be treated as rough approximation only.
      Returns:
      the currently used memory, in bytes.

    • gc

      private static void gc()

    • main

      public static void main(String[] args) throws ClassNotFoundException
      Throws:
      ClassNotFoundException