ostore.archive.events
Class GenerateFragsBlkReq

java.lang.Object
  |
  +--ostore.archive.events.GenerateFragsBlkReq

All Implemented Interfaces:

QueueElementIF, QuickSerializable

public class GenerateFragsBlkReq

extends Object

implements QueueElementIF, QuickSerializable

GenerateFragsBlkReq is an event class that generates Fragments for a block.

USAGE

The required fields are blockId (CacheableIdentity of block), numFragments (number of Fragments generated for block), inverseRate (inverse rate of encoding), erasureType (code for the type of erasure code to use).

Version:

$Id: GenerateFragsBlkReq.java,v 1.20 2004/03/23 03:00:46 hweather Exp $

Author:

Hakim Weatherspoon

See Also:

GenerateFragsBlkResp, GenerateFragsChkptReq, Fragment, Erasure

Field Summary

CacheableIdentity	blockId blockId == CacheableIdentity of block.
int	blockSize blockSize stores all the block size of each block, except the topblock can be larger or smaller.
int	erasureType erasureType == code for the type of erasure code to use.
CacheablePinned	handle handle to block itself
int	inverseRate inverseRate == rate of encoding.
int	numFragments numFragments == number of fragments generated for block.
CacheableIdentity	parentBlockId parentBlockId == CacheableIdentity of parent block.
SinkIF	sink Requestor sink to use to return the response.
Object	userData Requestor defined object to be returned in the response.

Constructor Summary

GenerateFragsBlkReq()
Constructor: Initializes instance variables to null.

GenerateFragsBlkReq(CacheableIdentity id, int numFrags, int inverseR, int erasureT, int bSize, CacheableIdentity parentId, CacheablePinned handle, Object userData, SinkIF sink)
Constructor.

GenerateFragsBlkReq(InputBuffer buffer)
Constructs a GenerateFragsBlkReq from its serialized form.

Method Summary

void	serialize(OutputBuffer buffer) Specified by ostore.util.QuickSerializable
String	toString() Specified by java.lang.Object

Methods inherited from class java.lang.Object

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

Field Detail

blockId

public CacheableIdentity blockId

blockId == CacheableIdentity of block.

numFragments

public int numFragments

numFragments == number of fragments generated for block.

inverseRate

public int inverseRate

inverseRate == rate of encoding.

erasureType

public int erasureType

erasureType == code for the type of erasure code to use. i.e. Cauchy.ENCODETYPE, Interleaved.ENCODETYPE

blockSize

public int blockSize

blockSize stores all the block size of each block, except the topblock can be larger or smaller. This piece of information is either retrieved from the version metadata on archive or from a fragment on reconstruct.

parentBlockId

public CacheableIdentity parentBlockId

parentBlockId == CacheableIdentity of parent block.

handle

public CacheablePinned handle

handle to block itself

userData

public Object userData

Requestor defined object to be returned in the response.

sink

public SinkIF sink

Requestor sink to use to return the response.

Constructor Detail

GenerateFragsBlkReq

public GenerateFragsBlkReq()

Constructor: Initializes instance variables to null.

GenerateFragsBlkReq

public GenerateFragsBlkReq(CacheableIdentity id,
                           int numFrags,
                           int inverseR,
                           int erasureT,
                           int bSize,
                           CacheableIdentity parentId,
                           CacheablePinned handle,
                           Object userData,
                           SinkIF sink)

Constructor. Initializes the data in this GenerateFragsBlkReq.

Parameters:

id - cacheable identity of block.

numFrags - number of fragments generated for block.

inverseR - rate of encoding.

erasureT - code for the type of erasure code to use.

bSize - size of block in bytes.

parentId - CacheableIdentity for parent block

handle - handle of parent block.

userData - Requestor defined object to be returned with response.

sink - Requestor sink to return resp.

GenerateFragsBlkReq

public GenerateFragsBlkReq(InputBuffer buffer)
                    throws QSException

Constructs a GenerateFragsBlkReq from its serialized form.

Parameters:

buffer - serialized form of object.

Method Detail

serialize

public void serialize(OutputBuffer buffer)

Specified by ostore.util.QuickSerializable

Specified by:

serialize in interface QuickSerializable

Parameters:

buffer - the output buffer to add the object to

toString

public String toString()

Specified by java.lang.Object

Overrides:

toString in class Object