In computer science, the Actor model is a mathematical model of concurrent computation that treats "actors" as the universal primitives of concurrent digital computation: in response to a message that it receives, an actor can make local decisions, create more actors, send more messages, and determine how to respond to the next message received.
patterns
What is Domain Driven Design ? DDD is OO done well!
Domain Driven Design can be seen as a philosophy for developing applications based on specific domains and their logic where an ubiquitous language use is probably one of its most important features. If you’ve read Eric Evan’s book, then you’d probably agree that Eric hasn’t really introduced (or invented) anything new. On the other hand, you’ll surely noticed that his book (which is responsible for introducing DDD concepts to many!) presents several good design practices, techniques and principles which you can apply to solve problems associated with complex domains. So, in a way, you can see DDD as something that has grouped several known principles for domain modeling.
In software engineering, an anti-pattern (or antipattern) is a design pattern that appears obvious but is ineffective or far from optimal in practice.
The term was coined in 1995 by Andrew Koenig, inspired by Gang of Four's book Design Patterns, which developed the concept of design patterns in the software field. The term was widely popularized three years later by the book AntiPatterns, which extended the use of the term beyond the field of software design and into general social interaction. According to the authors of the latter, there must be at least two key elements present to formally distinguish an actual anti-pattern from a simple bad habit, bad practice, or bad idea:
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