org.jgroups.protocols

Class PrioHeader

java.lang.Object

org.jgroups.Header

org.jgroups.protocols.PrioHeader

All Implemented Interfaces:

Streamable

public class PrioHeader
extends Header

This Header class is used in conjunction with the PRIO protocol to prioritize message sending/receiving Priority values are from 0 to 255 where 0 is the highest priority Example of setting a message priority: // Create a message to send to everyone Message message = new Message( null, null, messagePayload ); // Add the priority protocol header PrioHeader header = new PrioHeader( 1 ); short protocolId = ClassConfigurator.getProtocolId(PRIO.class); message.putHeader( protocolId, header);

Author:

Michael Earl

Field Summary

Fields inherited from class org.jgroups.Header

prot_id

Constructor Summary

Constructors

Constructor and Description
PrioHeader()
PrioHeader(byte priority)

Method Summary

Modifier and Type	Method and Description
byte	getPriority()
void	readFrom(java.io.DataInput instream) Read the state of the current object (including superclasses) from instream Note that the input stream must not be closed
void	setPriority(byte priority)
int	size() To be implemented by subclasses.
java.lang.String	toString()
void	writeTo(java.io.DataOutput outstream) Write the entire state of the current object (including superclasses) to outstream.

Methods inherited from class org.jgroups.Header

getProtId, setProtId

Methods inherited from class java.lang.Object

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

Constructor Detail

PrioHeader

public PrioHeader()

PrioHeader

public PrioHeader(byte priority)

Method Detail

getPriority

public byte getPriority()

setPriority

public void setPriority(byte priority)

size

public int size()

Description copied from class: Header

To be implemented by subclasses. Return the size of this object for the serialized version of it. I.e. how many bytes this object takes when flattened into a buffer. This may be different for each instance, or can be the same. This may also just be an estimation. E.g. FRAG uses it on Message to determine whether or not to fragment the message. Fragmentation itself will be accurate, because the entire message will actually be serialized into a byte buffer, so we can determine the exact size.

Specified by:

size in class Header

writeTo

public void writeTo(java.io.DataOutput outstream)
             throws java.lang.Exception

Description copied from interface: Streamable

Write the entire state of the current object (including superclasses) to outstream. Note that the output stream must not be closed

Throws:

java.lang.Exception

readFrom

public void readFrom(java.io.DataInput instream)
              throws java.lang.Exception

Description copied from interface: Streamable

Read the state of the current object (including superclasses) from instream Note that the input stream must not be closed

Throws:

java.lang.Exception

toString

public java.lang.String toString()

Overrides:

toString in class Header