com.sun.enterprise.mgmt

Class LWRMulticast

java.lang.Object

com.sun.enterprise.mgmt.LWRMulticast

All Implemented Interfaces:

MessageListener, EventListener

public class LWRMulticast
extends Object
implements MessageListener

The LWRMulticast class is useful for sending and receiving JXTA multicast messages. A LWRMulticast is a (UDP) DatagramSocket, with additional capabilities for joining "groups" of other multicast hosts on the internet. A multicast group is specified within the context of PeerGroup and a propagate pipe advertisement. One would join a multicast group by first creating a MulticastSocket with the desired peer group and pipe advertisement.

Field Summary

Fields

Modifier and Type	Field and Description
static String	ACKTAG Ack message element name
protected MessageListener	msgListener The application message listener
static String	SEQTAG seq number message element name
static String	SRCIDTAG source node id message element name

Constructor Summary

Constructors

Constructor and Description
LWRMulticast(ClusterManager manager, MessageListener msgListener) Create a multicast channel bind it to a specific pipe within specified peer group

Method Summary

Modifier and Type	Method and Description
void	close() Closes this LWRMulticast.
Set<PeerID>	getAckList() Returns a list of ack's received from nodes identified by PeerID's
static long	getSequenceID(Message msg) returns the source peer id of a message
long	getSoTimeout() Gets the Timeout attribute of the LWRMulticast
static PeerID	getSource(Message msg) returns the source peer id of a message
int	getType() Returns the message type which Message is supporting i.g.
boolean	isBound() Returns the binding state of the LWRMulticast.
boolean	isClosed() Returns the closed state of the LWRMulticast.
void	joinGroup(ClusterManager manager, MessageListener msgListener) joins MutlicastSocket to specified pipe within the context of group
void	receiveMessageEvent(MessageEvent event) Processing a MessageEvent
void	send(Message msg, int threshold) Send a message to the predefined set of nodes, and expect a minimum of specified acks.
boolean	send(PeerID pid, Message msg) Send a message.
boolean	send(Set<PeerID> ids, Message msg) Send a message to a set of peers
void	setSoTimeout(long timeout) Sets the Timeout attribute of the LWRMulticast a timeout of 0 blocks forever, by default this channel's timeout is set to 0

Methods inherited from class java.lang.Object

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

Field Detail

ACKTAG

public static final String ACKTAG

Ack message element name

See Also:

Constant Field Values

SEQTAG

public static final String SEQTAG

seq number message element name

See Also:

Constant Field Values

SRCIDTAG

public static final String SRCIDTAG

source node id message element name

See Also:

Constant Field Values

msgListener

protected transient MessageListener msgListener

The application message listener

Constructor Detail

LWRMulticast

public LWRMulticast(ClusterManager manager,
                    MessageListener msgListener)
             throws IOException

Create a multicast channel bind it to a specific pipe within specified peer group

Parameters:

manager - the ClusterManger

msgListener - the application listener

Throws:

IOException - if an io error occurs

Method Detail

joinGroup

public void joinGroup(ClusterManager manager,
                      MessageListener msgListener)
               throws IOException

joins MutlicastSocket to specified pipe within the context of group

Parameters:

manager - the ClusterManger

msgListener - The application message listener

Throws:

IOException - if an io error occurs

isBound

public boolean isBound()

Returns the binding state of the LWRMulticast.

Returns:

true if the LWRMulticast successfully bound to an address

close

public void close()

Closes this LWRMulticast.

receiveMessageEvent

public void receiveMessageEvent(MessageEvent event)
                         throws MessageIOException

Processing a MessageEvent

Specified by:

receiveMessageEvent in interface MessageListener

Parameters:

event - a received message event

Throws:

MessageIOException - if I/O error occurs

getType

public int getType()

Description copied from interface: MessageListener

Returns the message type which Message is supporting i.g. Message.TYPE_CLUSTER_MANAGER_MESSAGE or Message.TYPE_HEALTH_MONITOR_MESSAGE's integer value or etc...

Specified by:

getType in interface MessageListener

Returns:

the message type about which this listener is concerned

getAckList

public Set<PeerID> getAckList()

Returns a list of ack's received from nodes identified by PeerID's

Returns:

a List of PeerID's

getSoTimeout

public long getSoTimeout()

Gets the Timeout attribute of the LWRMulticast

Returns:

The soTimeout value

setSoTimeout

public void setSoTimeout(long timeout)
                  throws IOException

Sets the Timeout attribute of the LWRMulticast a timeout of 0 blocks forever, by default this channel's timeout is set to 0

Parameters:

timeout - The new soTimeout value

Throws:

IOException - if an I/O error occurs

isClosed

public boolean isClosed()

Returns the closed state of the LWRMulticast.

Returns:

true if the channel has been closed

getSequenceID

public static long getSequenceID(Message msg)

returns the source peer id of a message

Parameters:

msg - message

Returns:

The source value

getSource

public static PeerID getSource(Message msg)

returns the source peer id of a message

Parameters:

msg - message

Returns:

The source value

send

public void send(Message msg,
                 int threshold)
          throws IOException

Send a message to the predefined set of nodes, and expect a minimum of specified acks.

This method blocks until ack's upto to the specified threshold have been received or the timeout has been reached. A call to getAckList() returns a list of ack source peer ID's

Parameters:

msg - the message to send

threshold - the minimun of ack expected, 0 indicates none are expected

Throws:

IOException - if an i/o error occurs, or SocketTimeoutException if the threshold is not met within timeout

send

public boolean send(PeerID pid,
                    Message msg)
             throws IOException

Send a message.

Parameters:

pid - destination PeerID

msg - the message to send

Returns:

boolean true if the message has been sent otherwise false. false. is commonly returned for non-error related congestion, meaning that you should be able to send the message after waiting some amount of time.

Throws:

IOException - if an i/o error occurs

send

public boolean send(Set<PeerID> ids,
                    Message msg)
             throws IOException

Send a message to a set of peers

Parameters:

ids - destination PeerIDs

msg - the message to send

Returns:

boolean true if the message has been sent otherwise false. false. is commonly returned for non-error related congestion, meaning that you should be able to send the message after waiting some amount of time.

Throws:

IOException - if an i/o error occurs