com.aspc.DBObj.Internal.impl

Class DBObjectArchiveDataLoader

java.lang.Object

com.aspc.DBObj.Internal.impl.DBObjectArchiveDataLoader

All Implemented Interfaces:

ArchiveDataLoader

public class DBObjectArchiveDataLoader
extends java.lang.Object
implements ArchiveDataLoader

Helper class for DBObject.
THREAD MODE: MULTI-THREADED

Since:

9 October 2002

Author:

Nigel Leck

Field Summary

Fields

Modifier and Type	Field and Description
static java.util.concurrent.atomic.AtomicLong	DATABASE_HITS the database hits for archive
static boolean	DISABLE_TRANS_HEADER_READ_AHEAD disabled the transaction read ahead
static java.lang.String	PROPERTY_DISABLE_TRANS_HEADER_READ_AHEAD The property to disable the transaction read ahead
static java.lang.String	PROPERTY_TRANS_HEADER_READ_NUMBER The property to disable the transaction read ahead
static int	TRANS_HEADER_READ_NUMBER disabled the transaction read ahead

Constructor Summary

Constructors

Constructor and Description
DBObjectArchiveDataLoader(VirtualDB layer, DBClass baseClass, TransHeader maxTransaction)

Method Summary

Modifier and Type	Method and Description
ArchiveLayerData	findFilteredLayerData(long rowId, Hint hint, TransHeader[] exclude, boolean doNotUseCurrentData, boolean allowCache) {@inheritDoc

Methods inherited from class java.lang.Object

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

Field Detail

PROPERTY_DISABLE_TRANS_HEADER_READ_AHEAD

public static final java.lang.String PROPERTY_DISABLE_TRANS_HEADER_READ_AHEAD

The property to disable the transaction read ahead

See Also:

Constant Field Values

DISABLE_TRANS_HEADER_READ_AHEAD

public static final boolean DISABLE_TRANS_HEADER_READ_AHEAD

disabled the transaction read ahead

PROPERTY_TRANS_HEADER_READ_NUMBER

public static final java.lang.String PROPERTY_TRANS_HEADER_READ_NUMBER

The property to disable the transaction read ahead

See Also:

Constant Field Values

TRANS_HEADER_READ_NUMBER

public static final int TRANS_HEADER_READ_NUMBER

disabled the transaction read ahead

DATABASE_HITS

public static final java.util.concurrent.atomic.AtomicLong DATABASE_HITS

the database hits for archive

Constructor Detail

DBObjectArchiveDataLoader

public DBObjectArchiveDataLoader(VirtualDB layer,
                                 DBClass baseClass,
                                 TransHeader maxTransaction)

Parameters:

layer - the layer

baseClass - the base class

maxTransaction - the max transaction

Method Detail

findFilteredLayerData

public ArchiveLayerData findFilteredLayerData(long rowId,
                                              Hint hint,
                                              TransHeader[] exclude,
                                              boolean doNotUseCurrentData,
                                              boolean allowCache)
                                       throws java.lang.Exception

{@inheritDoc

Specified by:

findFilteredLayerData in interface ArchiveDataLoader

Parameters:

rowId - the row UID

hint - the hint

exclude - the excluded transactions

doNotUseCurrentData - do not use the current data ( recovery mode)

allowCache - should we allow cached results ?

Returns:

the layer data

Throws:

java.lang.Exception}

java.lang.Exception - a serious problem has occurred.