fabric.messages
Class DissemReadMessage

java.lang.Object
  fabric.messages.Message<RemoteStore,DissemReadMessage.Response>
      fabric.messages.DissemReadMessage

public final class DissemReadMessage
extends Message<RemoteStore,DissemReadMessage.Response>

A DissemReadMessage represents a request from a dissemination node to read an object at a store. This implicitly subscribes the worker to receive the next update to the object.

Nested Class Summary

static class

DissemReadMessage.Response

Nested classes/interfaces inherited from class fabric.messages.Message

Message.MessageType

Field Summary

long	onum The onum of the object to read.

Fields inherited from class fabric.messages.Message

messageType

Constructor Summary

protected	DissemReadMessage(java.io.DataInput in) Deserialization constructor.
	DissemReadMessage(long onum) Creates a read request for a worker.

Method Summary

DissemReadMessage.Response	dispatch(MessageHandlerThread w) Calls the appropriate handle(...) method on the handler.
DissemReadMessage.Response	response(RemoteStore c, java.io.DataInput in) Creates a Response message of the appropriate type using the provided input stream.
DissemReadMessage.Response	send(RemoteStore store)
void	write(java.io.DataOutput out) Writes this message out on the given output stream.

Methods inherited from class fabric.messages.Message

dispatch, receive, send

Methods inherited from class java.lang.Object

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

Field Detail

onum

public final long onum

The onum of the object to read.

Constructor Detail

DissemReadMessage

public DissemReadMessage(long onum)

Creates a read request for a worker.

DissemReadMessage

protected DissemReadMessage(java.io.DataInput in)
                     throws java.io.IOException

Deserialization constructor.

Throws:

java.io.IOException

Method Detail

dispatch

public DissemReadMessage.Response dispatch(MessageHandlerThread w)
                                    throws AccessException

Description copied from class: Message

Calls the appropriate handle(...) method on the handler.

Overrides:

dispatch in class Message<RemoteStore,DissemReadMessage.Response>

Returns:

the result computed by the handler

Throws:

AccessException

send

public DissemReadMessage.Response send(RemoteStore store)
                                throws FetchException

Throws:

FetchException

response

public DissemReadMessage.Response response(RemoteStore c,
                                           java.io.DataInput in)
                                    throws java.io.IOException

Description copied from class: Message

Creates a Response message of the appropriate type using the provided input stream.

Specified by:

response in class Message<RemoteStore,DissemReadMessage.Response>

Parameters:

c - the remote node from which the response originated.

in - Input stream containing the message.

Returns:

A Response message with the appropriate type.

Throws:

java.io.IOException

write

public void write(java.io.DataOutput out)
           throws java.io.IOException

Description copied from class: Message

Writes this message out on the given output stream. Only used by the worker.

Specified by:

write in class Message<RemoteStore,DissemReadMessage.Response>

Throws:

java.io.IOException - if the output stream throws an IOException.