org.apache.jena.dboe.sys

Class SystemIndex

java.lang.Object

org.apache.jena.dboe.sys.SystemIndex

public class SystemIndex
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static int	BlockReadCacheSize Size of read block cache (32 bit systems only).
static int	BlockSize Size, in bytes, of a block
static int	BlockSizeTest Size, in bytes, of a block for testing
static int	BlockSizeTestMem Size, in bytes, of a block for testing
static int	BlockWriteCacheSize Size of the delayed-write block cache (32 bit systems only) (per file)
static boolean	Checking
static byte	FillByte FillByte value for NullOut
static boolean	is64bitSystem
static int	Node2NodeIdCacheSize Size of Node to NodeId cache.
static int	NodeId2NodeCacheSize Size of NodeId to Node cache.
static int	NodeMissCacheSize Size of Node lookup miss cache.
static boolean	NullOut null out (with the FillByte) freed up space in buffers
static int	OrderMem Order of an in-memory BTree or B+Tree
static int	SegmentSize Size, in bytes, of a segment (used for memory mapped files)
static int	SizeOfPointer Size, in bytes, of a pointer between blocks

Constructor Summary

Constructors

Constructor and Description
SystemIndex()

Method Summary

Modifier and Type	Method and Description
static FileMode	fileMode()
static boolean	getNullOut() Are we nulling out unused space in bytebuffers (records, points etc)
static void	init()
static void	setFileMode(FileMode newFileMode)
static void	setNullOut(boolean nullOut)

Methods inherited from class java.lang.Object

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

Field Detail

SizeOfPointer

public static final int SizeOfPointer

Size, in bytes, of a pointer between blocks

See Also:

Constant Field Values

is64bitSystem

public static final boolean is64bitSystem

BlockSize

public static final int BlockSize

Size, in bytes, of a block

See Also:

Constant Field Values

BlockSizeTest

public static final int BlockSizeTest

Size, in bytes, of a block for testing

See Also:

Constant Field Values

BlockSizeTestMem

public static final int BlockSizeTestMem

Size, in bytes, of a block for testing

See Also:

Constant Field Values

OrderMem

public static final int OrderMem

Order of an in-memory BTree or B+Tree

See Also:

Constant Field Values

SegmentSize

public static final int SegmentSize

Size, in bytes, of a segment (used for memory mapped files)

See Also:

Constant Field Values

Node2NodeIdCacheSize

public static final int Node2NodeIdCacheSize

Size of Node to NodeId cache. Used to map from Node to NodeId spaces. Used for loading and for query preparation.

NodeId2NodeCacheSize

public static final int NodeId2NodeCacheSize

Size of NodeId to Node cache. Used to map from NodeId to Node spaces. Used for retriveing results.

NodeMissCacheSize

public static final int NodeMissCacheSize

Size of Node lookup miss cache.

See Also:

Constant Field Values

BlockWriteCacheSize

public static final int BlockWriteCacheSize

Size of the delayed-write block cache (32 bit systems only) (per file)

BlockReadCacheSize

public static final int BlockReadCacheSize

Size of read block cache (32 bit systems only). Increase JVM size as necessary. Per file.

NullOut

public static boolean NullOut

null out (with the FillByte) freed up space in buffers

FillByte

public static final byte FillByte

FillByte value for NullOut

See Also:

Constant Field Values

Checking

public static boolean Checking

Constructor Detail

SystemIndex

public SystemIndex()

Method Detail

init

public static void init()

setNullOut

public static void setNullOut(boolean nullOut)

getNullOut

public static boolean getNullOut()

Are we nulling out unused space in bytebuffers (records, points etc)

fileMode

public static FileMode fileMode()

setFileMode

public static void setFileMode(FileMode newFileMode)