INF 123 SW Arch, dist sys & interop Lecture 13
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INF 123 SW ARCH, DIST SYS & INTEROP LECTURE 13 Prof. Crista Lopes
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INF 123 SW Arch, dist sys & interop Lecture 13. Prof. Crista Lopes. Objectives. Understanding of Event-Based Architectures Understanding practicalities of th e Internet IP addresses routers security. Event-Based Architectures. - PowerPoint PPT Presentation
Transcript of INF 123 SW Arch, dist sys & interop Lecture 13
INF 123 SW ARCH, DIST SYS & INTEROP
LECTURE 13Prof. Crista Lopes
Objectives Understanding of Event-Based
Architectures Understanding practicalities of the
Internet IP addresses routers security
Event-Based Architectures An EBA is an architecture based on parts
that interact solely or predominantly using event notifications, instead of direct method calls.
Event-Based Architectures
Component A Component B
Event Broker
1 23 4
1. Component A registers an event of type E2. Component B subscribes to that event type3. Component A raises that event4. Component B is notified of that event
Advantage over direct calls
Component A Component BE
Component C
E
…
coupling
Advantage over direct calls
Component A Component B
Event Broker
1 23 4
Component C…No coupling!
2 4
Disadvantage over direct calls Less control on timing More difficult to understand program
flow
Events at different levels Software architecture
possibly with programming language support
System architecture
SW Level without PL support
Object A Object B
Event Broker (your code or library object)
1 23 4
Object C…
2 4
SW Level with PL Support
Object A Object B
Event Broker
1 23 4
Object C…
2 4Language runtime
Distributed System Level
Component A Component B
Event Broker (your component or someone else’s)
1 23 4
Component C…
2 4
Network
Part 2
The Internet
ipconfig @ home
myipaddress.com
myIPaddress.com
Your computer’s IP address is:
75.32.137.8
Hierarchical Identification
Home network Home network
ISP ISP
UCI
192.x.x.x 192.x.x.x
75.32.137.8 69.232.36.159128.195.54.203
128.195.54.203
Hierarchical Security
Home network Home network
ISP ISP
UCI
OpenSim Virtual World deployment
Home network Home network
ISP ISP
UCI
192.x.x.x 192.x.x.x
75.32.137.8 69.232.36.159ucigrid03.nacs.uci.edu
128.195.54.203
ResourceServices
Simulator Simulator
region registration
teleport!
What the clients see
