What is Meant by "Open"?
Traditionally "open systems" implied that:
.Every component implements only publicly defined standards created by open processes
Some Problems
Is TCP/IP Open? (Produced by the government)
Is Linux Open? (Not compliant to POsIX or other standards)
Is CORBA Open? (Produced by a consortium)
Is Windows Open? (Owned by a single corporation)
A Practical Definition
An Open system is one whose infrastructure is Widely accepted, Responsive to user needs, Is unlikely to be changed capriciously, Is not exorbitantly expensive.
Open Architecture
An Open Architecture is:
- Implementable using an open infrastructure
- Developed using an open methodolgy
- Described by an open notation
- Predictably successful meeting requirements using open predictive techniques
- For Real-Time Systems
- An open architecture must be predictably capable of meeting application time constraints
Levels of Real Time Performance
Measured
. (quantitative indications) may or may not be repeatable
Repeatable Measured
. Measuring the temperature 3 days DOES NOT help tomorrow
Statistically Predictable Architecture
. Statistical - average response and related standard deviation
Analytically Guaranteed bounded latency
. Maximum duration between an event and its associated response
Deterministic
. Knowledge of every state of a system over time
"What Is An Open Architecture Platform"
"What Is Open Architecture Software"
"Open Architecture Computer"
"Open Architecture Standards"
"Open Architecture In Insurance"
"What Is Open Architecture Investment Management"
"Open Architecture Vs Closed Architecture"
"Open Architecture Principles"
