de.ruedigermoeller.heapoff.structs

Class FSTTypedStructAllocator<T extends FSTStruct>

java.lang.Object

de.ruedigermoeller.heapoff.structs.FSTStructAllocator

de.ruedigermoeller.heapoff.structs.FSTTypedStructAllocator<T>

public class FSTTypedStructAllocator<T extends FSTStruct>
extends FSTStructAllocator

An extension of FSTStructAllocaor to ease pools of specific objects. A template (for new allocs) instance is associated with this allocator instance. Created with IntelliJ IDEA. User: ruedi Date: 23.07.13 Time: 18:20 To change this template use File | Settings | File Templates.

Field Summary

Fields inherited from class de.ruedigermoeller.heapoff.structs.FSTStructAllocator

chunk, chunkIndex, chunkSize

Constructor Summary

Constructors

Constructor and Description
FSTTypedStructAllocator(int chunkSizeBytes, T template) Create a Structallocator for the given template.
FSTTypedStructAllocator(T ontpl) Create a Structallocator for the given template.
FSTTypedStructAllocator(T ontpl, int objectsPerChunk) Create a Structallocator for the given template.

Method Summary

Methods

Modifier and Type	Method and Description
static FSTStruct	createStructPointer(byte[] b, int index)
int	getTemplateSize()
static FSTStruct	getVolatileStructPointer(byte[] b, int index)
StructArray<T>	newArray(int size) create a new struct array of same type as template
<K extends FSTStruct> StructMap<K,T>	newMap(int size, K keyTemplate) create a fixed size struct hashmap.
static <C extends FSTStruct> C	newPointer(Class<C> clazz)
T	newStruct()
static <T extends FSTStruct> T	toStruct(T onHeapTemplate)

Methods inherited from class de.ruedigermoeller.heapoff.structs.FSTStructAllocator

getFactory, newArray, newMap, newStruct

Methods inherited from class java.lang.Object

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

Constructor Detail

FSTTypedStructAllocator

public FSTTypedStructAllocator(T ontpl)

Create a Structallocator for the given template. Chunksize will be set to the size of one template struct, so with each strutc allocation an individual byte array is created behind the scenes

Parameters:

ontpl -

FSTTypedStructAllocator

public FSTTypedStructAllocator(T ontpl,
                       int objectsPerChunk)

Create a Structallocator for the given template. Chunksize will be set to contain 'objectsPerChunk' instances of the given struct template.

Parameters:

ontpl -

objectsPerChunk -

FSTTypedStructAllocator

public FSTTypedStructAllocator(int chunkSizeBytes,
                       T template)

Create a Structallocator for the given template. Chunksize will be set directly

Parameters:

template -

chunkSizeBytes -

Method Detail

createStructPointer

public static FSTStruct createStructPointer(byte[] b,
                            int index)

Parameters:

b -

index -

Returns:

a new allocated pointer matching struct type stored in b[]

toStruct

public static <T extends FSTStruct> T toStruct(T onHeapTemplate)

Type Parameters:

T -

Parameters:

onHeapTemplate -

Returns:

return a byte array based struct instance for given on-heap template. Allocates a new byte[] with each call

getVolatileStructPointer

public static FSTStruct getVolatileStructPointer(byte[] b,
                                 int index)

Parameters:

b -

index -

Returns:

a pointer matching struct type stored in b[] from the thread local cache

newPointer

public static <C extends FSTStruct> C newPointer(Class<C> clazz)

Type Parameters:

C -

Parameters:

clazz -

Returns:

a newly allocated pointer matching. use baseOn to point it to a meaningful location

newArray

public StructArray<T> newArray(int size)

create a new struct array of same type as template

Parameters:

size -

Returns:

newMap

public <K extends FSTStruct> StructMap<K,T> newMap(int size,
                                          K keyTemplate)

create a fixed size struct hashmap. Note it should be of fixed types for keys and values, as the space for those is allocated directly. Additionally keys and values are stored 'in-place' without references.

Type Parameters:

K -

Parameters:

size -

keyTemplate -

Returns:

newStruct

public T newStruct()

getTemplateSize

public int getTemplateSize()