Module org.apache.jena.tdb

Package org.apache.jena.tdb1.base.file

Class BufferAllocatorMapped

java.lang.Object

org.apache.jena.tdb1.base.file.BufferAllocatorMapped

All Implemented Interfaces:

org.apache.jena.atlas.lib.Closeable, BufferAllocator

public final class BufferAllocatorMapped
extends Object
implements BufferAllocator

ByteBuffer access to a temporary file, using memory mapped I/O. The file will grow in chunks as necessary by the SystemTDB.SegmentSize.

This class is not thread-safe.

Constructor Summary

Constructors

Constructor	Description
BufferAllocatorMapped(int blockSize)

Method Summary

Modifier and Type	Method	Description
ByteBuffer	allocate(int blkSize)	Allocate and return a ByteBuffer of the given size
void	clear()	Call this method when you are finished with all of the ByteBuffers retrieved from allocate.
void	close()

Methods inherited from class java.lang.Object

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

Constructor Details

BufferAllocatorMapped

public BufferAllocatorMapped(int blockSize)

Method Details

allocate

public ByteBuffer allocate(int blkSize)

Description copied from interface: BufferAllocator

Allocate and return a ByteBuffer of the given size

Specified by:

allocate in interface BufferAllocator

Parameters:

blkSize - the desired size of the ByteBuffer

Returns:

a ByteBuffer with the capacity set to the desired size

clear

public void clear()

Description copied from interface: BufferAllocator

Call this method when you are finished with all of the ByteBuffers retrieved from allocate. The BufferAllocator is then free to reuse memory that was previously handed out.

Specified by:

clear in interface BufferAllocator

close

public void close()

Specified by:

close in interface org.apache.jena.atlas.lib.Closeable