drcl.inet.contract
Class RTConfig

java.lang.Object
  |
  +--drcl.comp.Contract
        |
        +--drcl.inet.contract.RTConfig

public class RTConfig

extends Contract

The RouteConfiguration contract. This contract defines five services at the reactor:

RTEntryAddition

The initiator sends a request that consists of:

1. an integer of value 0 (the "add" command),
2. the key of the entry (RTKey),
3. the entry (RTEntry) and
4. the lifetime for the entry (double).

The reactor adds (modifies if the entry already exists) the entry in the routing table and keeps the entry until the lifetime ends. The lifetime can be nonpositive or Double.NaN to have the entry not removed. In the case of a modification, zero lifetime makes the reactor keep the previous lifetime setting.

Graft

The initiator sends a request that has the same format as an "add" request except that the first command field is an integer of 1 (the "graft" command). Upon receipt of a "graft" request, the reactor modifies the route entry as if it were an "add" request except that the reactor grafts the outgoing interfaces specified in the route entry in the request, instead of replacing with them.

Prune

The initiator sends a request that has the same format as an "add" request except that the first command field is an integer of 2 (the "prune" command). Upon receipt of a "prune" request, the reactor modifies the route entry as if it were an "add" request except that the reactor prunes the outgoing interfaces specified in the route entry in the request, instead of replacing with them.

RTEntriesRemoval

The initiator sends a request that consists of:

1. an integer of value 3 (the "remove" command),
2. the key to the entries (RTKey), and
3. the method of matching the key to the keys in the routing table.

For exact match, the key in the request is used to find the entry with exactly the same key in the routing table. For all matches, the reactor finds all the route entries with their keys matched to only the value (the mask field is ignored) of the key in the request. For the longest match, the reactor finds the route entry, among all the matched entries, with its key being matched to the value of the key in the request by most number of bits. For wildcard match, the reactor find the route entries with their keys' values (not including mask) matched to the key in the request. All the entries of the matched keys are removed and returned. In the cases of exact and longest matches, at most one entry is returned in RTEntry. In other cases, an array of matched entries (drcl.inet.data.RTEntry[]) are returned.

RTEntriesRetrieval

The format of a retrieval request is the same as a removal except that the first command field is an integer of 4 (the "retrieve" command). The reactor will return all the matched entries in the same fashion as responding a removal request except that the entries are not removed from the routing table.

This class also provides a set of static methods to faciliate conducting the above services (add(...), graft(...), prune(...), remove(...) and retrieve(...)) from the specified port. In addition, it provides a convenient call getAllEntries(drcl.comp.Port) to get all the routing entries from a specified port. These methods are particularly useful in implementing a (routing) protocol that is in charge of maintaining the routing table of the node.

Version:

1.0, 10/17/2000

Author:

Hung-ying Tyan

See Also:

RTKey, RTEntry

Inner Class Summary

static class

RTConfig.Message

Field Summary

static int	ADD The "add" command used in the "add an entry" service.
static int	ENTRY
static java.lang.Object	EXTENSION_NO_CHANGE
static int	GRAFT The "graft" command used in the "graft" service.
static RTConfig	INSTANCE
static int	KEY
static java.lang.String	MATCH_ALL The match-all argument used in the "remove" or "retrieve" service.
static java.lang.String	MATCH_EXACT The exact match argument used in the "remove" or "retrieve" service.
static java.lang.String	MATCH_LONGEST The longest match argument used in the "remove" or "retrieve" service.
static int	MATCH_TYPE
static java.lang.String	MATCH_WILDCARD The wildcard match argument used in the "remove" or "retrieve" service.
static long	NEXT_HOP_NO_CHANGE
static BitSet	OUT_IFS_NO_CHANGE
static int	PRUNE The "prune" command used in the "prune" service.
static int	REMOVE The "remove" command used in the "remove entries" service.
static int	RETRIEVE The "retrieve" command used in the "retrieve entries" service.
static int	TIMEOUT
static double	TIMEOUT_NO_CHANGE
static int	TYPE

Fields inherited from class drcl.comp.Contract

Role_INITIATOR, Role_PEER, Role_REACTOR

Constructor Summary

RTConfig()

RTConfig(int role_)

Method Summary

static void	add(RTKey key_, RTEntry entry_, double timeout_, Port out_)
static java.lang.Object	createAddRequest(RTKey key_, RTEntry entry_, double timeout_)
static java.lang.Object	createGetAllRequest()
static java.lang.Object	createGraftRequest(RTKey key_, BitSet bs_, double timeout_)
static java.lang.Object	createGraftRequest(RTKey key_, BitSet bs_, java.lang.Object extension_, double timeout_)
static java.lang.Object	createPruneRequest(RTKey key_, BitSet bs_, double timeout_)
static java.lang.Object	createPruneRequest(RTKey key_, BitSet bs_, java.lang.Object extension_, double timeout_)
static java.lang.Object	createRemoveRequest(RTKey key_, java.lang.String match_)
static java.lang.Object	createRetrieveRequest(RTKey key_, java.lang.String match_)
static java.lang.Object	getAllEntries(Port out_)
java.lang.Object	getContractContent() Returns the content of this contract (format?).
java.lang.String	getName()
static void	graft(RTKey key_, BitSet bs_, java.lang.Object extension_, double timeout_, Port out_)
static void	prune(RTKey key_, BitSet bs_, java.lang.Object extension_, double timeout_, Port out_)
static java.lang.Object	remove(RTKey key_, java.lang.String match_, Port out_)
static java.lang.Object	retrieve(RTKey key_, java.lang.String match_, Port out_)

Methods inherited from class drcl.comp.Contract

getRole, match, setRole

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final RTConfig INSTANCE

NEXT_HOP_NO_CHANGE

public static final long NEXT_HOP_NO_CHANGE

OUT_IFS_NO_CHANGE

public static final BitSet OUT_IFS_NO_CHANGE

EXTENSION_NO_CHANGE

public static final java.lang.Object EXTENSION_NO_CHANGE

TIMEOUT_NO_CHANGE

public static final double TIMEOUT_NO_CHANGE

ADD

public static final int ADD

The "add" command used in the "add an entry" service.

GRAFT

public static final int GRAFT

The "graft" command used in the "graft" service.

PRUNE

public static final int PRUNE

The "prune" command used in the "prune" service.

REMOVE

public static final int REMOVE

The "remove" command used in the "remove entries" service.

RETRIEVE

public static final int RETRIEVE

The "retrieve" command used in the "retrieve entries" service.

TYPE

public static final int TYPE

KEY

public static final int KEY

ENTRY

public static final int ENTRY

TIMEOUT

public static final int TIMEOUT

MATCH_TYPE

public static final int MATCH_TYPE

MATCH_EXACT

public static final java.lang.String MATCH_EXACT

The exact match argument used in the "remove" or "retrieve" service. In this type of match, the key is used to find exactly the same key in the routing table. Exactly one key or none in the routing table will be matched to the given key.

MATCH_LONGEST

public static final java.lang.String MATCH_LONGEST

The longest match argument used in the "remove" or "retrieve" service. In this type of match, the value of the key is used to find the longest match among all matched keys. Exactly one key or none in the routing table will be matched to the given key.

See Also:

MATCH_ALL

MATCH_ALL

public static final java.lang.String MATCH_ALL

The match-all argument used in the "remove" or "retrieve" service. In this type of match, only the value of the key is used to find all the matched keys in the routing table. There may be more than one key or none at all in the routing table matched to the given key.

MATCH_WILDCARD

public static final java.lang.String MATCH_WILDCARD

The wildcard match argument used in the "remove" or "retrieve" service. In this type of match, only the values of the keys in the routing table is used to match the given key. There may be more than one key or none at all in the routing table matched to the given key. The given key with value 0 and mask 0 will be wildcard matched to all possible keys.

Constructor Detail

RTConfig

public RTConfig()

RTConfig

public RTConfig(int role_)

Method Detail

getName

public java.lang.String getName()

Overrides:

getName in class Contract

getContractContent

public java.lang.Object getContractContent()

Description copied from class: Contract

Returns the content of this contract (format?).

Overrides:

getContractContent in class Contract

add

public static void add(RTKey key_,
                       RTEntry entry_,
                       double timeout_,
                       Port out_)

graft

public static void graft(RTKey key_,
                         BitSet bs_,
                         java.lang.Object extension_,
                         double timeout_,
                         Port out_)

prune

public static void prune(RTKey key_,
                         BitSet bs_,
                         java.lang.Object extension_,
                         double timeout_,
                         Port out_)

remove

public static java.lang.Object remove(RTKey key_,
                                      java.lang.String match_,
                                      Port out_)

retrieve

public static java.lang.Object retrieve(RTKey key_,
                                        java.lang.String match_,
                                        Port out_)

getAllEntries

public static java.lang.Object getAllEntries(Port out_)

createAddRequest

public static java.lang.Object createAddRequest(RTKey key_,
                                                RTEntry entry_,
                                                double timeout_)

createGraftRequest

public static java.lang.Object createGraftRequest(RTKey key_,
                                                  BitSet bs_,
                                                  double timeout_)

createGraftRequest

public static java.lang.Object createGraftRequest(RTKey key_,
                                                  BitSet bs_,
                                                  java.lang.Object extension_,
                                                  double timeout_)

createPruneRequest

public static java.lang.Object createPruneRequest(RTKey key_,
                                                  BitSet bs_,
                                                  double timeout_)

createPruneRequest

public static java.lang.Object createPruneRequest(RTKey key_,
                                                  BitSet bs_,
                                                  java.lang.Object extension_,
                                                  double timeout_)

createRemoveRequest

public static java.lang.Object createRemoveRequest(RTKey key_,
                                                   java.lang.String match_)

createRetrieveRequest

public static java.lang.Object createRetrieveRequest(RTKey key_,
                                                     java.lang.String match_)

createGetAllRequest

public static java.lang.Object createGetAllRequest()