com.orientechnologies.common.directmemory

Class ODirectMemoryAllocator

java.lang.Object

com.orientechnologies.common.directmemory.ODirectMemoryAllocator

All Implemented Interfaces:

ODirectMemoryAllocatorMXBean

public class ODirectMemoryAllocator
extends Object
implements ODirectMemoryAllocatorMXBean

Manages all allocations/deallocations from/to direct memory. Also tracks the presence of memory leaks.

See Also:

OGlobalConfiguration.DIRECT_MEMORY_POOL_LIMIT

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ODirectMemoryAllocator.Intention

Constructor Summary

Constructors

Constructor and Description
ODirectMemoryAllocator()

Method Summary

Modifier and Type	Method and Description
OPointer	allocate(int size, boolean clear, ODirectMemoryAllocator.Intention intention) Allocates chunk of direct memory of given size.
void	checkMemoryLeaks() Verifies that all pointers which were allocated by allocator are freed.
void	checkTrackedPointerLeaks() Checks reference queue to find direct memory leaks
void	deallocate(OPointer pointer) Returns allocated direct memory back to OS
long	getMemoryConsumption()
static ODirectMemoryAllocator	instance()

Methods inherited from class java.lang.Object

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

Constructor Detail

ODirectMemoryAllocator

public ODirectMemoryAllocator()

Method Detail

instance

public static ODirectMemoryAllocator instance()

Returns:

singleton instance.

allocate

public OPointer allocate(int size,
                         boolean clear,
                         ODirectMemoryAllocator.Intention intention)

Allocates chunk of direct memory of given size.

Parameters:

size - Amount of memory to allocate

clear - clears memory if needed

intention - Why this memory is allocated. This parameter is used for memory profiling.

Returns:

Pointer to allocated memory

Throws:

ODirectMemoryAllocationFailedException - if it is impossible to allocate amount of direct memory of given size

deallocate

public void deallocate(OPointer pointer)

Returns allocated direct memory back to OS

getMemoryConsumption

public long getMemoryConsumption()

Specified by:

getMemoryConsumption in interface ODirectMemoryAllocatorMXBean

Returns:

Amount of direct memory allocated using this allocator

checkMemoryLeaks

public void checkMemoryLeaks()

Verifies that all pointers which were allocated by allocator are freed.

checkTrackedPointerLeaks

public void checkTrackedPointerLeaks()

Checks reference queue to find direct memory leaks