The Gaia System - PowerPoint PPT Presentation

1 / 41
About This Presentation
Title:

The Gaia System

Description:

6.893 Spring 2004: Gaia Larry Rudolph. Similarities. Pervasive ... Provides functionality to manipulate components in Gaia: Creation. Destruction. Uploading ... – PowerPoint PPT presentation

Number of Views:62
Avg rating:3.0/5.0
Slides: 42
Provided by: orgCsa
Category:
Tags: gaia | system

less

Transcript and Presenter's Notes

Title: The Gaia System


1
The Gaia System
2
Not Invented Here
  • Lots of Pervasive Computing Projects
  • Carnegie Mellon Univ.
  • U. Washington
  • Georgia Tech
  • UC Berkeley
  • Univ. Illinois Urbana Champaign
  • Gaia
  • England Scandinavia ??

3
Similarities
  • Pervasive computing can be characterized as
  • Extensive management for components (services,
    devices)
  • Components are autonomous
  • Some application programming support
  • Java or Python
  • Rules or scripts
  • Still very primitive (in my opinion)

4
Gaia Architecture
Applications
QoS Adaptation Service
Application Framework
QoS Instantiation Service
Configuration Management Service
Context File System
Context Service
Component Repository
Presence Service
Space Repository
Component Management Core
5
Component Management Core
  • Provides functionality to manipulate components
    in Gaia
  • Creation
  • Destruction
  • Uploading
  • Contains three basic abstractions
  • Components
  • Component Containers
  • Nodes

6
Component Management Core
Active Space
Gaia Component Container
Gaia Node
Gaia Node
Gaia Components
Gaia Component Container
Gaia Node Examples
7
Gaia Kernel Services
  • Event Manager
  • Context Service
  • Context File System
  • Component Repository
  • Presence Service
  • Space Repository

8
Event Manager
  • Loosely coupled communication based on channels.
  • Supports push, pull, and hybrid mechanisms.
  • Supports creation of named event channels and
    distribution of load.

9
Event Manager
Event Channel Factory 1
Event Channel Factory n
Suppliers
Suppliers
. . .
Event Manager
Event Channels
CreateChannelType DeleteChannelType CreateEventCha
nnel GetEventChannel DeleteEventChannel ListChanne
lTypes ListEventChannels
Consumers
Consumers
10
Context-Aware Applications
  • Situational information, or context, increases
    richness of communication in human-computer
    interaction.
  • Makes it possible to produce more useful
    computational services.
  • Example contexts location, time, weather, stock
    prices, moods, user activity,

11
Context Service
  • Provides a taxonomy and uniform representation of
    context types.
  • Provides an infrastructure to promote design,
    implementation, and evolution of context-aware
    applications.

12
Context File System
  • Data Organization
  • Context affects data organization.
  • Data important in current context is easily
    accessible.
  • Can attach context to files and directories.
  • Context situation, location, space, group, time.
  • Data Transformation
  • Applications open data as desired type
    dynamically typed file system.
  • System converts data to desired type.

13
Data Organization
space office location RM2401 time 11/28/01
14
Data Transformation
15
Component Repository
  • Provides persistent storage of components.
  • Allows addition, removal, and browsing of
    components.
  • Used by Component Management Core to dynamically
    retrieve components.

16
Presence Service
  • Detects the presence of digital and physical
    entities.
  • Generates events based on entity presence
  • ENTER
  • LEAVE
  • Defines a group of event channels to disseminate
    presence information.
  • Maintains soft-state of all digital entities
    through a leasing mechanism.

17
Presence Service
Physical Entity Presence
Person Presence Channel
Person
Application Presence Channel
Person Tracker
Enter Leave Events
Device Presence Channel
Service
Service Presence Channel
Digital Entity Presence
Application
Device
Event Manager Channels
18
Space Repository
  • Centralized repository containing information
    about active entities.
  • Interacts with Presence Service to keep
    information up to date.
  • All entities described by a set of properties
    (e.g., entity type, name, location, owner).
  • Exports a query interface based on properties.

19
Space Repository
Presence Channels
Component
Detection Mechanism
Component
Query Interface
Database
Component
20
Application Framework
  • Active Spaces render traditional applications
    obsolete.
  • Applications for Active Spaces are
  • Distributed
  • Adaptable
  • Mobile
  • Multi-Machine User Interface

21
Traditional Application Mapping
Application Logic
Display
Controller
22
Active Space Application Mapping
23
Model Presentation Controller Coordinator
Application Framework
Model
Controllers
Presentations
Slide Show Data
Application Functional Level
Application Meta-Level
Coordinator
MPCC Application
24
MPCC Application Framework
  • Model encapsulates the application logic.
  • Presentation presents the data of the model
    (audio, video, changes in the physical
    environment).
  • Controller modifies the state of the model.
  • Coordinator manages the application
    architecture (application meta-level).

25
(No Transcript)
26
(No Transcript)
27
(No Transcript)
28
Application Generic Description
29
Application Concrete Descp.
30
(No Transcript)
31
Applications
  • Mobile Video
  • Context Data Browser
  • Presentation Viewer

32
Mobile Video
Move!
Location A
Location B
Media Gateway
Media Server
Component Database
User Profile Server
33
Context Data Browser
Context Mode
File Mode
34
Presentation Viewer
35
(No Transcript)
36
(No Transcript)
37
The Context Model
  • Enables creation of complex, first-order
    expressions involving context
  • Makes it possible to write rules, prove theorems,
    evaluate queries

38
Basic Structure
  • Four parts
  • context-type
  • Subject Person, place, or thing
  • Relater something that related subject to object
  • Object is a value associated with subject

39
Some examples
  • Context(Location, Chris, Entering, G868)
  • Context(Temperature, G868, Is, 98F)
  • Context(Stock Quote, IBM, , 60 )
  • Context(Printer Status, Pulp, Is, Empty)
  • Context(Time, New York, Is 1200 01/01/04)

40
Operations on Contexts
  • Boolean, Existential, Quantification
  • Context(lighting, G868,Is,Off) OR
  • Context(lighting, G828,IS, Dim)

41
Context Chat
Write a Comment
User Comments (0)
About PowerShow.com