org.apache.flink.table.runtime.util

Class LazyMemorySegmentPool

java.lang.Object

org.apache.flink.table.runtime.util.LazyMemorySegmentPool

All Implemented Interfaces:

Closeable, AutoCloseable, MemorySegmentSource, MemorySegmentPool

public class LazyMemorySegmentPool
extends Object
implements MemorySegmentPool, Closeable

MemorySegmentPool that lazy allocate memory pages from MemoryManager.

Constructor Summary

Constructors

Constructor and Description
LazyMemorySegmentPool(Object owner, MemoryManager memoryManager, int maxPages)

Method Summary

Modifier and Type	Method and Description
List<MemorySegment>	allocateSegments(int required)
void	cleanCache()
void	close()
int	freePages()
MemorySegment	nextSegment() Gets the next memory segment.
int	pageSize() Get the page size of each page this pool holds.
void	returnAll(List<MemorySegment> memory) Return all pages back into this pool.
void	returnPage(MemorySegment segment)

Methods inherited from class java.lang.Object

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

Constructor Detail

LazyMemorySegmentPool

public LazyMemorySegmentPool(Object owner,
                             MemoryManager memoryManager,
                             int maxPages)

Method Detail

pageSize

public int pageSize()

Description copied from interface: MemorySegmentPool

Get the page size of each page this pool holds.

Specified by:

pageSize in interface MemorySegmentPool

Returns:

the page size

returnAll

public void returnAll(List<MemorySegment> memory)

Description copied from interface: MemorySegmentPool

Return all pages back into this pool.

Specified by:

returnAll in interface MemorySegmentPool

Parameters:

memory - the pages which want to be returned.

returnPage

public void returnPage(MemorySegment segment)

nextSegment

public MemorySegment nextSegment()

Description copied from interface: MemorySegmentSource

Gets the next memory segment. If no more segments are available, it returns null.

Specified by:

nextSegment in interface MemorySegmentSource

Returns:

The next memory segment, or null, if none is available.

allocateSegments

public List<MemorySegment> allocateSegments(int required)

freePages

public int freePages()

Specified by:

freePages in interface MemorySegmentPool

Returns:

Free page number.

close

public void close()

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

cleanCache

public void cleanCache()