Package org.apache.cassandra.utils

Class ObjectSizes

  • public class ObjectSizes
extends java.lang.Object
    A convenience class for wrapping access to MemoryMeter

    • Constructor Summary

      Constructors 
      Constructor Description
      ObjectSizes()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static long measure​(java.lang.Object pojo)  
      static long measureDeep​(java.lang.Object pojo)  
      static long sizeOf​(java.lang.String str)
      Memory a String consumes
      static long sizeOfArray​(byte[] bytes)
      Memory a byte array consumes
      static long sizeOfArray​(int[] ints)
      Memory an int array consumes
      static long sizeOfArray​(long[] longs)
      Memory a long array consumes
      static long sizeOfArray​(java.lang.Object[] objects)
      Memory a reference array consumes itself only
      static long sizeOfEmptyByteArray()  
      static long sizeOfEmptyHeapByteBuffer()  
      static long sizeOfReferenceArray​(int length)
      Memory a reference array consumes
      static long sizeOnHeapExcludingData​(java.nio.ByteBuffer[] array)  
      static long sizeOnHeapOf​(java.nio.ByteBuffer buffer)
      Memory a byte buffer consumes
      static long sizeOnHeapOf​(java.nio.ByteBuffer[] array)
      Memory a ByteBuffer array consumes.

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • ObjectSizes

        public ObjectSizes()

    • Method Detail

      • sizeOfArray

        public static long sizeOfArray​(byte[] bytes)
        Memory a byte array consumes
        Parameters:
        bytes - byte array to get memory size
        Returns:
        heap-size of the array

      • sizeOfArray

        public static long sizeOfArray​(long[] longs)
        Memory a long array consumes
        Parameters:
        longs - byte array to get memory size
        Returns:
        heap-size of the array

      • sizeOfArray

        public static long sizeOfArray​(int[] ints)
        Memory an int array consumes
        Parameters:
        ints - byte array to get memory size
        Returns:
        heap-size of the array

      • sizeOfReferenceArray

        public static long sizeOfReferenceArray​(int length)
        Memory a reference array consumes
        Parameters:
        length - the length of the reference array
        Returns:
        heap-size of the array

      • sizeOfArray

        public static long sizeOfArray​(java.lang.Object[] objects)
        Memory a reference array consumes itself only
        Parameters:
        objects - the array to size
        Returns:
        heap-size of the array (excluding memory retained by referenced objects)

      • sizeOnHeapOf

        public static long sizeOnHeapOf​(java.nio.ByteBuffer[] array)
        Memory a ByteBuffer array consumes.

      • sizeOnHeapExcludingData

        public static long sizeOnHeapExcludingData​(java.nio.ByteBuffer[] array)

      • sizeOnHeapOf

        public static long sizeOnHeapOf​(java.nio.ByteBuffer buffer)
        Memory a byte buffer consumes
        Parameters:
        buffer - ByteBuffer to calculate in memory size
        Returns:
        Total in-memory size of the byte buffer

      • sizeOfEmptyHeapByteBuffer

        public static long sizeOfEmptyHeapByteBuffer()

      • sizeOfEmptyByteArray

        public static long sizeOfEmptyByteArray()

      • sizeOf

        public static long sizeOf​(java.lang.String str)
        Memory a String consumes
        Parameters:
        str - String to calculate memory size of
        Returns:
        Total in-memory size of the String

      • measureDeep

        public static long measureDeep​(java.lang.Object pojo)
        Parameters:
        pojo - the object to measure
        Returns:
        the size on the heap of the instance and all retained heap referenced by it, excluding portions of ByteBuffer that are not directly referenced by it but including any other referenced that may also be retained by other objects.

      • measure

        public static long measure​(java.lang.Object pojo)
        Parameters:
        pojo - the object to measure
        Returns:
        the size on the heap of the instance only, excluding any referenced objects