net.jini.discovery
Class OutgoingMulticastAnnouncement

java.lang.Object
  net.jini.discovery.OutgoingMulticastAnnouncement

public class OutgoingMulticastAnnouncement
extends Object

Encapsulate the details of marshaling a multicast announcement into one or more packets.

Author:

Sun Microsystems, Inc.

See Also:

IncomingMulticastAnnouncement

Field Summary

protected static int	maxPacketSize The maximum size we allow for an outgoing packet.
protected static int	minMaxPacketSize The minimum size we allow for an outgoing packet.
protected static int	protocolVersion The current version of the multicast announcement protocol.

Constructor Summary

OutgoingMulticastAnnouncement()

Method Summary

static DatagramPacket[]

marshal(ServiceID id, LookupLocator loc, String[] groups) Marshal a multicast announcement into one or more datagram packets.

Methods inherited from class java.lang.Object

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

Field Detail

minMaxPacketSize

protected static final int minMaxPacketSize

The minimum size we allow for an outgoing packet.

See Also:

Constant Field Values

maxPacketSize

protected static final int maxPacketSize

The maximum size we allow for an outgoing packet. This may be controlled using the net.jini.discovery.mtu system property. The value cannot be less than 512. The default is 512.

protocolVersion

protected static final int protocolVersion

The current version of the multicast announcement protocol.

See Also:

Constant Field Values

Constructor Detail

OutgoingMulticastAnnouncement

public OutgoingMulticastAnnouncement()

Method Detail

marshal

public static DatagramPacket[] marshal(ServiceID id,
                                       LookupLocator loc,
                                       String[] groups)
                                throws IOException

Marshal a multicast announcement into one or more datagram packets. These packets are guaranteed to contain, between them, all of the groups of which the to-be-announced lookup service is a member.

The datagram packets returned will have been initialized for sending to the appropriate multicast address and UDP port.

Parameters:

id - the ServiceID we are announcing

loc - a LookupLocator that will allow unicast discovery of the lookup service we are announcing

groups - the groups of which the announced lookup service is a member

Returns:

an array of datagram packets, which will always contain at least one member

Throws:

IOException - a problem occurred during marshaling