goofs

Class RetrieveDataMessage

java.lang.Object

goofs.Message

goofs.RetrieveDataMessage

All Implemented Interfaces:

java.io.Serializable

public class RetrieveDataMessage
extends Message

Author:

Elliott Forney

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class goofs.Message

Message.Kind

Field Summary

Fields inherited from class goofs.Message

dst, kind, src

Constructor Summary

Constructors

Constructor and Description
RetrieveDataMessage(HostID src, HostID[] chunkServers, ChunkDescriptor chunkDesc) Create a new message requesting data retrieval.

Method Summary

Modifier and Type	Method and Description
boolean	expectsReply() Determine whether or not this message should attempt to get a reply.
ChunkDescriptor	getChunkDescriptor()
byte[]	getData()
RetrieveDataMessage	send() Send this message to its destination and get reply.
void	setData(byte[] data)
boolean	setNextDest() Set message to be sent to next chunkserver.

Methods inherited from class goofs.Message

getDest, getSource, setDest, setSource, swapSrcDst, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

RetrieveDataMessage

public RetrieveDataMessage(HostID src,
                           HostID[] chunkServers,
                           ChunkDescriptor chunkDesc)

Create a new message requesting data retrieval.

Parameters:

src - Message source, client or chunkserver.

chunkServers - Chunkservers holding data.

chunkDesc - Chunk descriptor describing data.

Method Detail

expectsReply

public boolean expectsReply()

Description copied from class: Message

Determine whether or not this message should attempt to get a reply.

Overrides:

expectsReply in class Message

Returns:

True if this message should wait for a reply after it is sent and false otherwise.

setNextDest

public boolean setNextDest()

Set message to be sent to next chunkserver.

Returns:

True if there are more destinations, false otherwise.

getChunkDescriptor

public ChunkDescriptor getChunkDescriptor()

getData

public byte[] getData()

setData

public void setData(byte[] data)

send

public RetrieveDataMessage send()
                         throws java.lang.Exception

Description copied from class: Message

Send this message to its destination and get reply.

Overrides:

send in class Message

Returns:

Message reply.

Throws:

java.lang.Exception