ClassSize (Apache Accumulo Core 2.1.2 API)

java.lang.Object
- org.apache.accumulo.core.file.blockfile.cache.impl.ClassSize

```
public class ClassSize
extends Object
```
Class for determining the "size" of a class, an attempt to calculate the actual bytes that an object of this class will occupy in memory The core of this class is taken from the Derby project

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`ARRAY`	Array overhead
`static int`	`ATOMIC_INTEGER`	Overhead for AtomicInteger
`static int`	`BYTE_BUFFER`	Overhead for ByteBuffer
`static int`	`CONCURRENT_HASHMAP`	Overhead for ConcurrentHashMap
`static int`	`CONCURRENT_HASHMAP_ENTRY`	Overhead for ConcurrentHashMap.Entry
`static int`	`CONCURRENT_HASHMAP_SEGMENT`	Overhead for ConcurrentHashMap.Segment
`static int`	`OBJECT`	Object overhead is minimum 2 * reference size (8 bytes on 64-bit)
`static int`	`REFERENCE`	Reference size is 8 bytes on 64-bit, 4 bytes on 32-bit
`static int`	`STRING`	String overhead

Constructor Summary

Constructors
Constructor Description

ClassSize()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static int`	`align(int num)`	Aligns a number to 8.
`static long`	`align(long num)`	Aligns a number to 8.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - ARRAY
```
public static final int ARRAY
```
    Array overhead
  - BYTE_BUFFER
```
public static final int BYTE_BUFFER
```
    Overhead for ByteBuffer
  - OBJECT
```
public static final int OBJECT
```
    Object overhead is minimum 2 * reference size (8 bytes on 64-bit)
  - REFERENCE
```
public static final int REFERENCE
```
    Reference size is 8 bytes on 64-bit, 4 bytes on 32-bit
  - STRING
```
public static final int STRING
```
    String overhead
  - CONCURRENT_HASHMAP
```
public static final int CONCURRENT_HASHMAP
```
    Overhead for ConcurrentHashMap
  - CONCURRENT_HASHMAP_ENTRY
```
public static final int CONCURRENT_HASHMAP_ENTRY
```
    Overhead for ConcurrentHashMap.Entry
  - CONCURRENT_HASHMAP_SEGMENT
```
public static final int CONCURRENT_HASHMAP_SEGMENT
```
    Overhead for ConcurrentHashMap.Segment
  - ATOMIC_INTEGER
```
public static final int ATOMIC_INTEGER
```
    Overhead for AtomicInteger
- Constructor Detail
  - ClassSize
```
public ClassSize()
```
- Method Detail
  - align
```
public static int align(int num)
```
    Aligns a number to 8.
    
    Parameters:
    
    num - number to align to 8
    
    Returns:
    
    smallest number >= input that is a multiple of 8
  - align
```
public static long align(long num)
```
    Aligns a number to 8.
    
    Parameters:
    
    num - number to align to 8
    
    Returns:
    
    smallest number >= input that is a multiple of 8