Module org.apache.arrow.dataset

Package org.apache.arrow.dataset.jni

Class DirectReservationListener

java.lang.Object

org.apache.arrow.dataset.jni.DirectReservationListener

All Implemented Interfaces:

ReservationListener

public class DirectReservationListener
extends Object
implements ReservationListener

Reserving Java direct memory bytes from java.nio.Bits. Used by Java Dataset API's C++ memory pool implementation. This makes memory allocated by the pool to be controlled by JVM option "-XX:MaxDirectMemorySize".

Method Summary

Modifier and Type	Method	Description
long	getCurrentDirectMemReservation()	Get current reservation of jVM direct memory.
static DirectReservationListener	instance()
void	reserve(long size)	Reserve bytes by invoking java.nio.java.Bitjava.nio.Bitss#reserveMemory.
void	unreserve(long size)	Unreserve bytes by invoking java.nio.java.Bitjava.nio.Bitss#unreserveMemory.

Methods inherited from class java.lang.Object

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

Method Details

instance

public static DirectReservationListener instance()

reserve

public void reserve(long size)

Reserve bytes by invoking java.nio.java.Bitjava.nio.Bitss#reserveMemory.

Specified by:

reserve in interface ReservationListener

unreserve

public void unreserve(long size)

Unreserve bytes by invoking java.nio.java.Bitjava.nio.Bitss#unreserveMemory.

Specified by:

unreserve in interface ReservationListener

getCurrentDirectMemReservation

public long getCurrentDirectMemReservation()

Get current reservation of jVM direct memory. Visible for testing.