org.infinispan.container.offheap

Class UnpooledOffHeapMemoryAllocator

java.lang.Object

org.infinispan.container.offheap.UnpooledOffHeapMemoryAllocator

All Implemented Interfaces:

OffHeapMemoryAllocator

public class UnpooledOffHeapMemoryAllocator
extends Object
implements OffHeapMemoryAllocator

Memory allocator that just allocates memory directly using Unsafe.

Since:

9.0

Author:

wburns

Constructor Summary

Constructors

Constructor and Description
UnpooledOffHeapMemoryAllocator()

Method Summary

Modifier and Type	Method and Description
long	allocate(long memoryLength) Allocates a new chunk of memory sized to the given length.
void	deallocate(long memoryAddress, long size) Deallocates the memory at the given address assuming a given size.
static long	estimateSizeOverhead(long size) Tries to estimate overhead of the allocation by first adding 8 to account for underlying allocator housekeeping and then rounds up to nearest power of 16 to account for 16 byte alignment.
long	getAllocatedAmount()
static long	offHeapEntrySize(boolean evictionEnabled, boolean writeMetadataSize, int keySize, int valueSize) See offHeapEntrySize(boolean, boolean, int, int, int, int)
static long	offHeapEntrySize(boolean evictionEnabled, boolean writeMetadataSize, int keySize, int valueSize, int metadataSize, int internalMetadataSize) It returns the off-heap size of an entry without alignment.

Methods inherited from class java.lang.Object

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

Constructor Detail

UnpooledOffHeapMemoryAllocator

public UnpooledOffHeapMemoryAllocator()

Method Detail

allocate

public long allocate(long memoryLength)

Description copied from interface: OffHeapMemoryAllocator

Allocates a new chunk of memory sized to the given length.

Specified by:

allocate in interface OffHeapMemoryAllocator

Parameters:

memoryLength - the size of memory to allocate

Returns:

the memory address where the memory resides

deallocate

public void deallocate(long memoryAddress,
                       long size)

Description copied from interface: OffHeapMemoryAllocator

Deallocates the memory at the given address assuming a given size. This size is the size that was provided to allocate.

Specified by:

deallocate in interface OffHeapMemoryAllocator

Parameters:

memoryAddress - the address to deallocate from

size - the total size

getAllocatedAmount

public long getAllocatedAmount()

Specified by:

getAllocatedAmount in interface OffHeapMemoryAllocator

estimateSizeOverhead

public static long estimateSizeOverhead(long size)

Tries to estimate overhead of the allocation by first adding 8 to account for underlying allocator housekeeping and then rounds up to nearest power of 16 to account for 16 byte alignment.

Parameters:

size - the desired size of the allocation

Returns:

the resulting size taking into account various overheads

offHeapEntrySize

public static long offHeapEntrySize(boolean evictionEnabled,
                                    boolean writeMetadataSize,
                                    int keySize,
                                    int valueSize)

See offHeapEntrySize(boolean, boolean, int, int, int, int)

offHeapEntrySize

public static long offHeapEntrySize(boolean evictionEnabled,
                                    boolean writeMetadataSize,
                                    int keySize,
                                    int valueSize,
                                    int metadataSize,
                                    int internalMetadataSize)

It returns the off-heap size of an entry without alignment.

If alignment is required, use estimateSizeOverhead(offHeapEntrySize(...)). See estimateSizeOverhead(long),

Parameters:

evictionEnabled - Set to true if eviction is enabled.

writeMetadataSize - Set to true if the Metadata has versioning or it is a custom implementation.

keySize - The key size.

valueSize - The value size.

metadataSize - The Metadata size. If writeMetadataSize is false, this parameter must include the size of mortal/transient entries (2 or 4 longs).

internalMetadataSize - The PrivateMetadata size.

Returns:

The off-heap entry size without alignment!