Package one.nio.mem

Class ArenaAllocator

java.lang.Object

one.nio.mem.ArenaAllocator

All Implemented Interfaces:

Allocator

public class ArenaAllocator
extends Object
implements Allocator

Fast arena-based allocator that does not suffer from fragmentation. Individual objects cannot be released; arena is disposed all at once.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static final class	ArenaAllocator.Arena

Field Summary

Fields

Modifier and Type	Field	Description
private long	accumulatedBytes
private ArenaAllocator.Arena	current
private static final long	MIN_ARENA_SIZE

Constructor Summary

Constructors

Constructor	Description
ArenaAllocator()

Method Summary

Modifier and Type	Method	Description
long	calloc(int size)
void	free(long address)
long	getAllocatedBytes()
protected long	getMemoryFromSystem(long size)
private ArenaAllocator.Arena	getNextArena(ArenaAllocator.Arena current, long size)
long	getReservedBytes()
long	malloc(int size)
void	release()
protected void	releaseMemoryToSystem(long addr, long size)
void	verify()	Verify the layout of the heap.

Methods inherited from class java.lang.Object

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

Field Details

MIN_ARENA_SIZE

private static final long MIN_ARENA_SIZE

See Also:

• Constant Field Values

current

private volatile ArenaAllocator.Arena current

accumulatedBytes

private long accumulatedBytes

Constructor Details

ArenaAllocator

public ArenaAllocator()

Method Details

release

public void release()

malloc

public long malloc(int size)

Specified by:

malloc in interface Allocator

calloc

public long calloc(int size)

Specified by:

calloc in interface Allocator

free

public void free(long address)

Specified by:

free in interface Allocator

verify

public void verify()

Description copied from interface: Allocator

Verify the layout of the heap. Expensive operation, used only for debugging purposes.

Specified by:

verify in interface Allocator

getNextArena

private ArenaAllocator.Arena getNextArena(ArenaAllocator.Arena current,
 long size)

getMemoryFromSystem

protected long getMemoryFromSystem(long size)

releaseMemoryToSystem

protected void releaseMemoryToSystem(long addr,
 long size)

getAllocatedBytes

public long getAllocatedBytes()

getReservedBytes

public long getReservedBytes()