goofs

Class GetHoldersMessage

java.lang.Object

goofs.Message

goofs.GetHoldersMessage

All Implemented Interfaces:

java.io.Serializable

public class GetHoldersMessage
extends Message

Message requesting chunkservers that are currently holding replicas associated with a given chunk descriptor.

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
GetHoldersMessage(HostID src, HostID dst, ChunkDescriptor chunkDesc) Send message requesting chunkservers holding a chunk associated with a given chunk descriptor.

Method Summary

Modifier and Type	Method and Description
boolean	expectsReply() Determine whether or not this message should attempt to get a reply.
ChunkDescriptor	getChunkDescriptor() Get the chunk descriptor sent in this message.
HostID[]	getChunkServers() Get the chunk servers sent in this message.
GetHoldersMessage	send() Send this message to its current destination.
void	setChunkServers(HostID[] chunkServers) Set the chunk servers sent in this message.

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

GetHoldersMessage

public GetHoldersMessage(HostID src,
                         HostID dst,
                         ChunkDescriptor chunkDesc)

Send message requesting chunkservers holding a chunk associated with a given chunk descriptor.

Parameters:

src - Message source, client or chunkserver.

dst - Message destination, controller.

chunkDesc - Chunk descriptor associated with the chunk we are interested in.

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.

getChunkDescriptor

public ChunkDescriptor getChunkDescriptor()

Get the chunk descriptor sent in this message.

Returns:

The chunk descriptor currently stored in this message.

setChunkServers

public void setChunkServers(HostID[] chunkServers)

Set the chunk servers sent in this message.

Parameters:

The - host id's of the chunk servers to send in this message.

getChunkServers

public HostID[] getChunkServers()

Get the chunk servers sent in this message.

Returns:

The chunk servers currently stored in this message.

send

public GetHoldersMessage send()
                       throws java.lang.Exception

Send this message to its current destination.

Overrides:

send in class Message

Returns:

Reply message.

Throws:

java.lang.Exception