Embed Size (px)
DESCRIPTION
Odin – Smart Middleware for Mobile Services. Andrew Meads [email protected]. Overview. Background Motivating Examples Challenges Odin Middleware Odin-Based Service Examples. Background. Traditional mobile app:. Request. Response. Background. Today’s smartphones are: - PowerPoint PPT Presentation
Citation preview
Department of Computer Science
Odin – Smart Middleware for Mobile Services
Andrew Meads
Department of Computer Science
Overview• Background• Motivating Examples• Challenges• Odin Middleware• Odin-Based Service Examples
COMPSCI 732
Department of Computer Science
Background• Traditional mobile app:
COMPSCI 732
Request
Response
Department of Computer Science
Background• Today’s smartphones are:
– Ubiquitous– Powerful– “Always” Connected
COMPSCI 732
What novel mobile apps can we come up with that make use of this?
Department of Computer Science
Background• Mobile service:
COMPSCI 732
Context
Department of Computer Science
COMPSCI 732
Motivation: Patient Monitoring• Location
from GPS
• Vital Signs from BAN
• Contact medical professionals in emergency
• Monitor in real-time• Control & give Feedback
Department of Computer Science
Motivation: Mobile Media
COMPSCI 732
• Media tagged with Context data
• Synchronize with external repository
• Consumers obtain media from any source
Department of Computer Science
Motivation: Social Networking
COMPSCI 732
• Friends share data real-time
in a P2P fashion
Department of Computer Science
Challenges• All these motivating examples sound cool, but:
– How do we discover mobile services?– How do we connect to them?– How do we remain connected?– How does a smartphone handle excessive
demand?– What happens when the battery runs low?– Etc…
COMPSCI 732
Department of Computer Science
Challenges: Mobility
COMPSCI 732
Department of Computer Science
Challenges: Reachability• Service reachability is an issue where a
device’s connection is via a mobile (e.g. 3G) network– Mobile network operators (MNOs) sometimes discard
traffic that originates outside of the mobile network– MNOs typically do not assign well-known addresses
to devices, or charge a premium for this service
COMPSCI 732
• Client sends message
• MNO Firewall blocks request
• Service doesn’t receive message
Department of Computer Science
Challenges: Scalability
COMPSCI 732
• Smartphones and 3G networks don’t scale to meet the demands of large numbers of clients
Department of Computer Science
Challenges: Availability• A mobile service’s availability is affected by
both its hosting device’s power and network status
COMPSCI 732
=
Department of Computer Science
Odin• How does Odin help solve these issues?
– Compare this…
COMPSCI 732
Department of Computer Science
Odin
COMPSCI 732
• How does Odin help solve these issues?– Compare this… to this.
• Odin introduces the concept of a Surrogate, which provides addional computational power and manages device – client communication.
Department of Computer Science
Odin: Overview
COMPSCI 732
• Middleware, in general, is a layer of software that sits between the application and platform (OS + hardware)
• Middleware promotes reuse, portability, and interoperability
Application
Odin (device)
Mobile device
Application
Middleware
Platform
Application
Jini
Mobile service
Application
Odin (intermediary)
Jini
Intermediary Client
Department of Computer Science
Odin: Jini Foundation• Jini is a service-oriented architecture specification and
implementation• Jini offers a programming model that leverages Java and extends
it to address the “eight fallacies of distributed computing”
COMPSCI 732
Client Service
Registry 1. Register2. Discover
3. Consume
• Logically centralised, physically distributed lookup service
• Protocol independent• Mobile code• Leasing mechanism• Distributed event
mechanism
http://www.jini.org
Department of Computer Science
Odin: Jini Surrogate Architecture• The Jini Surrogate Architecture (JSA) specification
arose to allow devices that cannot run Jini to expose their services to Jini clients
COMPSCI 732
Client Surrogate Host
Registry 2. Register3. Discover
4. ConsumeDevice
Interconnect
1. Surrogate Registration
Surrogate
Department of Computer Science
Odin: Surrogate and Interconnect• Odin’s primary benefits over stock JSA include:
– A multi-channel interconnect– A smart Surrogate cloud
COMPSCI 732
Client
Registry
Surrogate Host
DeviceSurrogate
Department of Computer Science
Odin: Reachability over 3G Networks
COMPSCI 732
Response
RequestHTTP Keep-Alive
Response (client request attached)
Keep-Alive (response attached)
Device Surrogate Host
ClientFirewall
Department of Computer Science
Odin: Vertical Handover• Proactive (in response to the detection of a
superior network)
COMPSCI 732
Device Surrogate Host
Interconnect
Department of Computer Science
Odin: Vertical Handover• Reactive (in response to failure)
COMPSCI 732
Device Surrogate Host
Interconnect
Department of Computer Science
Odin: Surrogate Migration
COMPSCI 732
Device
Surrogate Host One
Surrogate Host Two
C1
C2
C3
C3
C4Surrogate
“Migrate”
Department of Computer Science
COMPSCI 732
Odin: Context Awareness
Department of Computer Science
iStalker: A Mobile Social Networking Service
COMPSCI 732
Main MenuCan view friends, locations, etc. Each “friend” has their own service providing info.
DetailsCan view details for all friends, even when their phones are off. Their Surrogate will still exist.
MapCan view friend’s locations on a map. Location data is provided as a service.
iPhone ProcessesBackground process communicates with the Surrogate.
Department of Computer Science
Health Monitoring Service
COMPSCI 732
Vital Sign Monitorprovided by Zephyr
Group AwarenessView health, status, and location of multiple people
Detailed Health MonitorView vital sign informaion
