net.jini.discovery
Class OutgoingMulticastRequest

java.lang.Object
  net.jini.discovery.OutgoingMulticastRequest

public class OutgoingMulticastRequest
extends Object

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

Author:

Sun Microsystems, Inc.

See Also:

IncomingMulticastRequest

Field Summary

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

OutgoingMulticastRequest()

Method Summary

static DatagramPacket[]	marshal(int responsePort, String[] groups, ServiceID[] heard) Using the default maximum packet size, marshal a multicast request into one or more datagram packets.
static DatagramPacket[]	marshal(int responsePort, String[] groups, ServiceID[] heard, int maxPacketSize) Using the given maximum packet size, marshal a multicast request 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

protocolVersion

protected static final int protocolVersion

The current version of the multicast announcement protocol.

See Also:

Constant Field Values

Constructor Detail

OutgoingMulticastRequest

public OutgoingMulticastRequest()

Method Detail

marshal

public static DatagramPacket[] marshal(int responsePort,
                                       String[] groups,
                                       ServiceID[] heard)
                                throws IOException

Using the default maximum packet size, marshal a multicast request into one or more datagram packets. These packets are guaranteed to contain, between them, all of the groups in which the requestor is interested. However, the set of ServiceIDs from which the requestor has heard may be incomplete.

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

Parameters:

responsePort - the port to which respondents should connect in order to start unicast discovery

groups - the set of groups in which the requestor is interested

heard - the set of ServiceIDs from which the requestor has already heard

Returns:

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

Throws:

IOException - an error occurred during marshalling.

IllegalArgumentException - when the number and length of the group names to marshal, relative to the value of the default packet size maximum, is too large.

marshal

public static DatagramPacket[] marshal(int responsePort,
                                       String[] groups,
                                       ServiceID[] heard,
                                       int maxPacketSize)
                                throws IOException

Using the given maximum packet size, marshal a multicast request into one or more datagram packets. These packets are guaranteed to contain, between them, all of the groups in which the requestor is interested. However, the set of ServiceIDs from which the requestor has heard may be incomplete.

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

Parameters:

responsePort - the port to which respondents should connect in order to start unicast discovery

groups - the set of groups in which the requestor is interested

heard - the set of ServiceIDs from which the requestor has already heard

maxPacketSize - the maximum size to allow for an outgoing packet

Returns:

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

Throws:

IOException - an error occurred during marshalling

IllegalArgumentException - when the value of the maxPacketSize argument is less than the default packet size maximum; or when the number and length of the group names to marshal, relative to the value of the maxPacketSize argument, is too large.