MemoryLayoutSpecification

java.lang.Object
- com.fr.intelli.metrics.memory.MemoryLayoutSpecification

public abstract class MemoryLayoutSpecification
extends java.lang.Object

字段概要

字段
限定符和类型字段和说明

static MemoryLayoutSpecification SPEC

字段
限定符和类型	字段和说明
`static MemoryLayoutSpecification`	`SPEC`

构造器概要

构造器
构造器和说明

MemoryLayoutSpecification()

构造器
构造器和说明
`MemoryLayoutSpecification()`

方法概要

方法
限定符和类型	方法和说明
`abstract int`	`getArrayHeaderSize()`
`abstract int`	`getObjectHeaderSize()`
`abstract int`	`getObjectPadding()`
`abstract int`	`getReferenceSize()`
`abstract int`	`getSuperclassFieldPadding()`
`static boolean`	`hasUnsafe()`
`static int`	`sizeOf(java.lang.reflect.Field field)`
`static long`	`sizeOf(java.lang.Object obj)`
`static long`	`sizeOfArray(int length, java.lang.Class<?> type)` Memory an array
`static long`	`sizeOfArray(int length, long elementSize)` Memory an array will consume
`static long`	`sizeOfArray(java.lang.Object instance, java.lang.Class<?> type)`
`static int`	`sizeOfField(java.lang.Class<?> type)`
`static long`	`sizeOfInstance(java.lang.Class<?> type)`
`static long`	`sizeOfInstanceWithUnsafe(java.lang.Class<?> type)`
`static long`	`sizeOfWithUnsafe(java.lang.Object obj)`

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 字段详细资料
  - SPEC
```
public static final MemoryLayoutSpecification SPEC
```
- 构造器详细资料
  - MemoryLayoutSpecification
```
public MemoryLayoutSpecification()
```
- 方法详细资料
  - getArrayHeaderSize
```
public abstract int getArrayHeaderSize()
```
  - getObjectHeaderSize
```
public abstract int getObjectHeaderSize()
```
  - getObjectPadding
```
public abstract int getObjectPadding()
```
  - getReferenceSize
```
public abstract int getReferenceSize()
```
  - getSuperclassFieldPadding
```
public abstract int getSuperclassFieldPadding()
```
  - hasUnsafe
```
public static boolean hasUnsafe()
```
  - sizeOf
```
public static int sizeOf(java.lang.reflect.Field field)
```
    返回:
    sizeOfField(field.getType())
  - sizeOfField
```
public static int sizeOfField(java.lang.Class<?> type)
```
    返回:
    The memory size of a field of a class of the provided type; for Objects this is the size of the reference only
  - sizeOf
```
public static long sizeOf(java.lang.Object obj)
```
    返回:
    The size of the provided instance as defined by the detected MemoryLayoutSpecification. For an array this is dependent on the size of the array, but for an object this is fixed for all instances
  - sizeOfWithUnsafe
```
public static long sizeOfWithUnsafe(java.lang.Object obj)
```
    返回:
    this allocated heap size of the instance provided; for arrays this is equivalent to sizeOf(obj), which uses the memory layout specification, however for objects this method uses
  - sizeOfInstance
```
public static long sizeOfInstance(java.lang.Class<?> type)
```
  - sizeOfInstanceWithUnsafe
```
public static long sizeOfInstanceWithUnsafe(java.lang.Class<?> type)
```
  - sizeOfArray
```
public static long sizeOfArray(java.lang.Object instance,
               java.lang.Class<?> type)
```
  - sizeOfArray
```
public static long sizeOfArray(int length,
               java.lang.Class<?> type)
```
    Memory an array
    
    参数:
    length - Number of elements in the array
    type - the array class type
    
    返回:
    In-memory size of the array
  - sizeOfArray
```
public static long sizeOfArray(int length,
               long elementSize)
```
    Memory an array will consume
    
    参数:
    length - Number of elements in the array
    elementSize - In-memory size of each element's primitive stored
    
    返回:
    In-memory size of the array

类 MemoryLayoutSpecification

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

SPEC

构造器详细资料

MemoryLayoutSpecification

方法详细资料

getArrayHeaderSize

getObjectHeaderSize

getObjectPadding

getReferenceSize

getSuperclassFieldPadding

hasUnsafe

sizeOf

sizeOfField

sizeOf

sizeOfWithUnsafe

sizeOfInstance

sizeOfInstanceWithUnsafe

sizeOfArray

sizeOfArray

sizeOfArray