org.treetank.jscsi

Class HybridTreetankStorageModule

java.lang.Object

org.treetank.jscsi.HybridTreetankStorageModule

All Implemented Interfaces:

org.jscsi.target.storage.IStorageModule

public class HybridTreetankStorageModule
extends Object
implements org.jscsi.target.storage.IStorageModule

TreetankStorageModule

This implementation is used to store data into treetank via an iscsi target.

Author:

Andreas Rain

Field Summary

Fields

Modifier and Type	Field and Description
static int	BLOCKS_IN_DATA Number of Blocks in one Cluster.
static int	BYTES_IN_DATA Number of Bytes in Bucket.

Fields inherited from interface org.jscsi.target.storage.IStorageModule

VIRTUAL_BLOCK_SIZE

Constructor Summary

Constructors

Constructor and Description
HybridTreetankStorageModule(long pNodeNumber, ISession pSession) Creates a storage module that is used by the target to handle I/O.

Method Summary

Methods

Modifier and Type	Method and Description
int	checkBounds(long logicalBlockAddress, int transferLengthInBlocks)
void	close()
long	getSizeInBlocks()
void	read(byte[] bytes, long storageIndex)
void	write(byte[] bytes, long storageIndex)

Methods inherited from class java.lang.Object

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

Field Detail

BLOCKS_IN_DATA

public static final int BLOCKS_IN_DATA

Number of Blocks in one Cluster. 8 equals 4KB datas; 16 equals 8KB datas ... When using berkeley db as a backend consider that if you increase the size of the blocks in datas up to 12800 datas can be held in ram. If you have a 1gb storage maximally 1gb heap is needed. However if the storage is bigger and the blocks per data is considerably high (e.g. 256kb per node) you might have to increase the ram for the jvm.

See Also:

Constant Field Values

BYTES_IN_DATA

public static final int BYTES_IN_DATA

Number of Bytes in Bucket.

See Also:

Constant Field Values

Constructor Detail

HybridTreetankStorageModule

public HybridTreetankStorageModule(long pNodeNumber,
                           ISession pSession)
                            throws TTException

Creates a storage module that is used by the target to handle I/O.

Parameters:

pNodeNumber - Define how many nodes the storage holds.

pSession - Pass the session associated to the location to this class.

Throws:

TTException - will be thrown if there are problems creating this storage.

Method Detail

checkBounds

public int checkBounds(long logicalBlockAddress,
              int transferLengthInBlocks)

Specified by:

checkBounds in interface org.jscsi.target.storage.IStorageModule

getSizeInBlocks

public long getSizeInBlocks()

Specified by:

getSizeInBlocks in interface org.jscsi.target.storage.IStorageModule

read

public void read(byte[] bytes,
        long storageIndex)
          throws IOException

Specified by:

read in interface org.jscsi.target.storage.IStorageModule

Throws:

IOException

write

public void write(byte[] bytes,
         long storageIndex)
           throws IOException

Specified by:

write in interface org.jscsi.target.storage.IStorageModule

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface org.jscsi.target.storage.IStorageModule

Throws:

IOException