es.tid.rsvp.constructs

Class FlowDescriptor

java.lang.Object

es.tid.rsvp.constructs.RSVPConstruct

es.tid.rsvp.constructs.FlowDescriptor

All Implemented Interfaces:

RSVPElement

Direct Known Subclasses:

FFFlowDescriptor, SEFlowDescriptor, WFFlowDescriptor

public class FlowDescriptor
extends RSVPConstruct

Represents a Flow Descriptor construct, as defined in RFC 2205.

• <flow descriptor list> ::= <empty> | <flow descriptor list> <flow descriptor>

If the INTEGRITY object is present, it must immediately follow the common header. The STYLE object followed by the flow descriptor list must occur at the end of the message, and objects within the flow descriptor list must follow the BNF given below. There are no other requirements on transmission order, although the above order is recommended.

The NHOP (i.e., the RSVP_HOP) object contains the IP address of the interface through which the Resv message was sent and the LIH for the logical interface on which the reservation is required.

The appearance of a RESV_CONFIRM object signals a request for a reservation confirmation and carries the IP address of the receiver to which the ResvConf should be sent. Any number of POLICY_DATA objects may appear.

The BNF above defines a flow descriptor list as simply a list of flow descriptors. The following style-dependent rules specify in more detail the composition of a valid flow descriptor list for each of the reservation styles.

• WF Style: <flow descriptor list> ::= <WF flow descriptor> <WF flow descriptor> ::= <FLOWSPEC>
• FF style: <flow descriptor list> ::= <FLOWSPEC> <FILTER_SPEC> | <flow descriptor list> <FF flow descriptor> <FF flow descriptor> ::= [ <FLOWSPEC> ] <FILTER_SPEC>

  Each elementary FF style request is defined by a single (FLOWSPEC, FILTER_SPEC) pair, and multiple such requests may be packed into the flow descriptor list of a single Resv message. A FLOWSPEC object can be omitted if it is identical to the most recent such object that appeared in the list; the first FF flow descriptor must contain a FLOWSPEC.

• SE style: <flow descriptor list> ::= <SE flow descriptor< <SE flow descriptor> ::= <FLOWSPEC> <filter spec list> <filter spec list> ::= <FILTER_SPEC> | <filter spec list< <FILTER_SPEC>

Author:

fmn

Field Summary

Fields inherited from class es.tid.rsvp.constructs.RSVPConstruct

bytes, length

Constructor Summary

Constructors

Constructor and Description
FlowDescriptor()

Method Summary

Modifier and Type	Method and Description
void	decode(byte[] bytes, int offset) Decode the Element based on the bytes passed, starting in the offset position
void	encode() Generic method to encode an RSVP element

Methods inherited from class es.tid.rsvp.constructs.RSVPConstruct

getBytes, getLength, setBytes, setLength

Methods inherited from class java.lang.Object

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

Constructor Detail

FlowDescriptor

public FlowDescriptor()

Method Detail

encode

public void encode()
            throws RSVPProtocolViolationException

Description copied from interface: RSVPElement

Generic method to encode an RSVP element

Throws:

RSVPProtocolViolationException

decode

public void decode(byte[] bytes,
                   int offset)
            throws RSVPProtocolViolationException

Description copied from class: RSVPConstruct

Decode the Element based on the bytes passed, starting in the offset position

Specified by:

decode in class RSVPConstruct

Throws:

RSVPProtocolViolationException