Module org.elasticsearch.nativeaccess

Package org.elasticsearch.nativeaccess.jdk

Class JdkMappedSegment

java.lang.Object

org.elasticsearch.nativeaccess.jdk.JdkMappedSegment

All Implemented Interfaces:

AutoCloseable, MappedSegment

Direct Known Subclasses:

PosixMappedSegment

public class JdkMappedSegment
extends Object
implements MappedSegment

Field Summary

Fields

Modifier and Type	Field	Description
protected final MemorySegment	segment

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	JdkMappedSegment(MemorySegment seg, Arena arena)

Method Summary

Modifier and Type	Method	Description
void	close()
void	madvise(long offset, long length, int advice)	Advises the operating system about the expected access pattern for the specified memory region, allowing the kernel to optimize paging behavior.
static JdkMappedSegment	ofShared(FileChannel fileChannel, FileChannel.MapMode mode, long position, long size)
void	prefetch(long offset, long length)	Prefetches the given offset and length.
MemorySegment	segment()	Returns the underlying MemorySegment backing this mapped region.
MappedSegment	slice(long index, long length)	Returns a slice of this segment.

Methods inherited from class java.lang.Object

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

Field Details

segment

protected final MemorySegment segment

Constructor Details

JdkMappedSegment

protected JdkMappedSegment(MemorySegment seg,
 Arena arena)

Method Details

ofShared

public static JdkMappedSegment ofShared(FileChannel fileChannel,
 FileChannel.MapMode mode,
 long position,
 long size)
                                 throws IOException

Throws:

IOException

segment

public MemorySegment segment()

Description copied from interface: MappedSegment

Returns the underlying MemorySegment backing this mapped region.

Specified by:

segment in interface MappedSegment

close

public void close()

Specified by:

close in interface AutoCloseable

Specified by:

close in interface MappedSegment

slice

public MappedSegment slice(long index,
 long length)

Description copied from interface: MappedSegment

Returns a slice of this segment. Closing a slice does not close its parent.

Specified by:

slice in interface MappedSegment

prefetch

public void prefetch(long offset,
 long length)

Description copied from interface: MappedSegment

Prefetches the given offset and length.

Specified by:

prefetch in interface MappedSegment

madvise

public void madvise(long offset,
 long length,
 int advice)

Description copied from interface: MappedSegment

Advises the operating system about the expected access pattern for the specified memory region, allowing the kernel to optimize paging behavior.

Specified by:

madvise in interface MappedSegment

Parameters:

offset - the starting offset within the buffer

length - the length of the region in bytes

advice - the access pattern advice; see MadviseAdvice constants