{"id":1428,"date":"2014-01-23T10:13:40","date_gmt":"2014-01-23T10:13:40","guid":{"rendered":"http:\/\/poseidon.iseresearch.i3a.uclm.es\/~tesorieror\/?page_id=1428"},"modified":"2022-10-19T17:32:04","modified_gmt":"2022-10-19T17:32:04","slug":"sb-pim","status":"publish","type":"page","link":"https:\/\/blog.uclm.es\/ricardotesoriero\/research\/cauce-model-driven-development-of-context-aware-applications-for-ubiquitous-computing-environments\/cases-of-studies\/shared-blackboard-sb\/sb-pim\/","title":{"rendered":"SB PIM"},"content":{"rendered":"

As result of the ATL M2M CIM to PIM transformation process, you get the space reference, information flow and entity context model depicted in Figure 94, Figure 95 and Figure 96.<\/p>\n

Referential space model<\/h4>\n

The referential space model (Figure 94) defines 4 sets of entity references:<\/p>\n

    \n
  1. The Guest group is composed by a single entity reference that represents the set of users in the system.<\/li>\n
  2. The chair group is composed by the Chair, AdminChair and UserChair entity references. This chair group entity references provides a mechanism to assign a role to a user. Besides, each reference represent a chair that is used by users to log in into the system, as each user has his\/her own chair, they are defined with the many cardinality.<\/li>\n
  3. The session control group is defined by the CreateControl, DeleteControl and JoinControl entity references. Each reference represent the set of controls each user is able to interact with after the user logs in and before he\/she joins a session, as each user has his\/her own controls they are defined with the many cardinality.<\/li>\n
  4. The editor control group is defined by the PrintControl, SaveControl , ExitSessionControl and Canvas entity references. As in session controls, each reference represent the set of controls each user is able to interact with after the user joined a session. Besides, as each user has his\/her own controls they are defined with the many cardinality.<\/li>\n<\/ol>\n
    \"Shared<\/a>
    Figure 94: Shared Blackboard Space Reference model<\/figcaption><\/figure>\n

    Information flow model<\/h4>\n

    The information flow model (Figure 95) is composed by two types of entities: execution and sensor entities. On the one hand, the Guest entity is the only execution entity. It is responsible for processing information brought from the environment through sensor entities. In addition, it is in charge of executing system tasks. On the other hand, the sensor entities provide information to execution entities from the environment.<\/p>\n

    UserChair and AdminChair produce data according to the events defined on the task model (take and leave). These events are transported through the UserChair-Chair and AdminChair-Chair information flows from the UserChair and AdminChair entities respectively to the Chair entity. Subsequently, they are forwarded to the Guest entity through the Chair2GuestEvent information flow.<\/p>\n

    The JoinControl, CreateControl and DeleteControl entities define the released event, that occurs when the control is activated notifying the released event to the Guest entity to perform the required action accordingly.<\/p>\n