Transcript Dynamic Policies through Context-sensitive Situations

Dynamic policies through
context-sensitive situations
Opher Etzion
IBM Research Laboratory in Haifa
An Example – AAA Flower
Delivery
• An “AAA (anyplace anytime any flower)” service delivery on the web
is being created. The customer can send to anywhere in the world
• AAA is a virtual store, it should acquire:
– Billing services using credit cards
– Shopping cart services to accumulate flowers
– Payment to supplier service
– Bid of flower shops
– Bid of delivery companies
• Each of them is considered as a separate service. A combination of
billing server, cart server, payment server, flower shop and delivery
company may be unique to each engagement, hence the dynamic
settingt .
Key Concepts
Context
Situation
Action
Policy
Context
• Temporal element (a collection of time
intervals)
• Bounded by two events (work hours)
• Can be composite (work hours when I am in
the office and not in a meeting).
• Can have spatial properties
Situation
• A trigger for reaction
• A (possible uncertain) predicate over the
history of events. Examples
– Amazon’s stock is down 3 percent over 2
hours.
– At least 3 times during a day, a single customer
purchased and then sold the same stock with a
value of at least $1,000,000.
Action
• A program that reacts to a situation
• Examples:
–
–
–
–
–
Various types of alerts (publish/subscribe)
A stock buy/sell program
A database update
Work re-schedule
Dynamic workflow creation.
Policy
• In a given context, if a situation occurs,
select (or create) and execute action (s).
An Example – AAA Flower
Delivery
• An “AAA (anyplace anytime any flower)” service delivery on the web
is being created. The customer can send to anywhere in the world
• AAA is a virtual store, it should acquire:
– Billing services using credit cards
– Shopping cart services to accumulate flowers
– Payment to supplier service
– Bid of flower shops
– Bid of delivery companies
• Each of them is considered as a separate service. A combination of
billing server, cart server, payment server, flower shop and delivery
company may be unique to each engagement, hence the dynamic
setting.
Monitoring Examples :
• IT example:
– the billing service application has been down for 10
minutes, thus contact alternative billing services next 5
minutes, and monitor its status at that time.
• Business process example:
– Delivery company A that uses trucks will unlikely (0.8)
to deliver on time, because of blocking road. An
automatic decision, based on economic factors is
carried out whether to ignore the situation, or issue
another shipment from the flower store F, and company
B who can deliver on time due to their locations.
Conclusion
• The work on dynamic policies is applicable
to many domains (CRM, system
management, business process
management, command and control…)
• By now we have worked on contexts and
situations.
• Current work concentrates on actions and
policies.