lac.cnet.groupdefiner.components

Class GroupDefiner

java.lang.Object

lac.cnet.groupdefiner.components.GroupDefiner

public class GroupDefiner
extends java.lang.Object

The GroupDefiners belong to the SDDL core and are responsible for defining the group-membership of all mobile nodes. To do so, they subscribe to the Context Update (CxtU) messages produced by any MN and published by the corresponding Gateway in the DDS domain. And based on some specific data field in this CxtU message, the GroupDefiners classify each MN into one or more groups. Then, using the DDS GroupAdvertisement topic, they disseminate any group membership change to all other elements in the SDDL core. The Gateways, on the other hand, subscribe to this topic so that they can update their group-to-node and node-to-group mapping of the corresponding node according to its new group membership. The main task of a GroupDefiner is thus to continuously check and update the MNīs group membership. For context-defined groups this is done by listening to the latest CxtU message by each MN being disseminated in the DDS domain and check if this context update causes some change in the nodeīs group memberships. Thus, whenever a GroupDefiner detects some group membership change of a MN it will publish into the DDS domain a Group-membership-diff message (shortly, G-diff) related to the MN, i.e. requesting to include MN into some groups, and to remove it from other groups.

Author:

Rafael Oliveira Vasconcelos

Constructor Summary

Constructors

Constructor and Description
GroupDefiner(GroupSelector groupSelector) Constructs GroupDefiner for specified Group Selection Module

Method Summary

Methods

Modifier and Type	Method and Description
GroupSelector	getGroupProcessor() Gets the Group Selection Module that is used by the GroupDefiner
void	receiveMessageTopic(Message mobileNodeInformation) Informs the GroupDefiner that there is a new CxtU to be processed
void	sendGDiffMessageToDomain(Message mobileNodeInformation, java.util.Collection<java.lang.Integer> gDiffMessage, int groupType) Sends the G-diff message through DDS Domains
void	sendGDiffProhibiteMessageToDomain(Message mobileNodeInformation, java.util.Collection<java.lang.Integer> prohibiteGroupCollection, int groupType) Sends the G-diff message through DDS Domains

Methods inherited from class java.lang.Object

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

Constructor Detail

GroupDefiner

public GroupDefiner(GroupSelector groupSelector)

Constructs GroupDefiner for specified Group Selection Module

Parameters:

groupSelector - processes the CxtU messages to classify mobile nodes into groups

Method Detail

receiveMessageTopic

public void receiveMessageTopic(Message mobileNodeInformation)

Informs the GroupDefiner that there is a new CxtU to be processed

Parameters:

mobileNodeInformation - CxtU message produced by a Mobile Node

sendGDiffMessageToDomain

public void sendGDiffMessageToDomain(Message mobileNodeInformation,
                            java.util.Collection<java.lang.Integer> gDiffMessage,
                            int groupType)

Sends the G-diff message through DDS Domains

Parameters:

mobileNodeInformation - Mobile Nodeīs CxtU message that holds its ID and Gateway

gDiffMessage - G-diff message that holds the group membership difference

groupType - Groupsī group type

sendGDiffProhibiteMessageToDomain

public void sendGDiffProhibiteMessageToDomain(Message mobileNodeInformation,
                                     java.util.Collection<java.lang.Integer> prohibiteGroupCollection,
                                     int groupType)

Sends the G-diff message through DDS Domains

Parameters:

mobileNodeInformation - Mobile Nodeīs CxtU message that holds its ID and Gateway

prohibiteGroupCollection -

groupType - Groupsī group type

getGroupProcessor

public GroupSelector getGroupProcessor()

Gets the Group Selection Module that is used by the GroupDefiner

Returns:

Group Selection Moduleīs Instance