org.fusesource.hawtdb.internal.page

Class SimpleAllocator

java.lang.Object

org.fusesource.hawtdb.internal.page.SimpleAllocator

All Implemented Interfaces:

Allocator

public class SimpleAllocator
extends Object
implements Allocator

This class is used to provides allocation management of pages.

Author:

Hiram Chirino

Constructor Summary

Constructors

Constructor and Description
SimpleAllocator(int limit)

Method Summary

Modifier and Type	Method and Description
int	alloc(int size) Allocates a continuous number of items and returns the position of first item in the sequence.
void	clear() Frees all previous allocations.
void	free(int pageId, int count) Frees a given number of items at a given position.
Ranges	getFreeRanges()
int	getLimit()
boolean	isAllocated(int page)
void	setFreeRanges(Ranges freePages)
String	toString()
void	unfree(int pageId, int count) Undoes a previous free method call.

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleAllocator

public SimpleAllocator(int limit)

Method Detail

alloc

public int alloc(int size)
          throws OutOfSpaceException

Description copied from interface: Allocator

Allocates a continuous number of items and returns the position of first item in the sequence.

Specified by:

alloc in interface Allocator

Throws:

OutOfSpaceException

See Also:

Allocator.alloc(int)

free

public void free(int pageId,
                 int count)

Description copied from interface: Allocator

Frees a given number of items at a given position.

Specified by:

free in interface Allocator

See Also:

Allocator.free(int, int)

unfree

public void unfree(int pageId,
                   int count)

Description copied from interface: Allocator

Undoes a previous free method call. optional method. implementations my throw UnsupportedOperationException

Specified by:

unfree in interface Allocator

See Also:

Allocator.unfree(int, int)

clear

public void clear()
           throws UnsupportedOperationException

Description copied from interface: Allocator

Frees all previous allocations. optional method. implementations my throw UnsupportedOperationException

Specified by:

clear in interface Allocator

Throws:

UnsupportedOperationException

setFreeRanges

public void setFreeRanges(Ranges freePages)
                   throws UnsupportedOperationException

Specified by:

setFreeRanges in interface Allocator

Throws:

UnsupportedOperationException

getLimit

public int getLimit()

Specified by:

getLimit in interface Allocator

Returns:

the maximum number of pages that this allocator will allocate.

isAllocated

public boolean isAllocated(int page)

Specified by:

isAllocated in interface Allocator

Returns:

true if the page has been allocated.

getFreeRanges

public Ranges getFreeRanges()

Specified by:

getFreeRanges in interface Allocator

toString

public String toString()

Overrides:

toString in class Object