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software engineering
Software engineering is a systematic engineering approach to software development.
A software engineer is a person who applies the principles of software engineering to design, develop, maintain, test, and evaluate computer software. The term '' ...
, the blackboard pattern is a behavioral design pattern
In software engineering, behavioral design patterns are design patterns that identify common communication patterns among objects. By doing so, these patterns increase flexibility in carrying out communication.
Design patterns
Examples of this t ...
that provides a computational framework for the design and implementation of systems that integrate large and diverse specialized modules, and implement complex, non-deterministic control strategies.
This pattern was identified by the members of the Hearsay-II project and first applied to speech recognition
Speech recognition is an interdisciplinary subfield of computer science and computational linguistics that develops methodologies and technologies that enable the recognition and translation of spoken language into text by computers with the m ...
.
Structure
The blackboard model defines three main components: * blackboard—a structured global memory containing objects from the solution space * knowledge sources—specialized modules with their own representation * control component—selects, configures and executes modules.Implementation
The first step is to design the solution space (i.e. potential solutions) that leads to the blackboard structure. Then, knowledge sources are identified. These two activities are closely related. The next step is to specify the control component; it generally takes the form of a complex scheduler that makes use of a set of domain-specific heuristics to rate the relevance of executable knowledge sources.
Applications
Usage-domains include: * speech recognition * vehicle identification and tracking * protein structure identification *sonar
Sonar (sound navigation and ranging or sonic navigation and ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigation, navigate, measure distances (ranging), communicate with or detect o ...
signals interpretation.
Consequences
The blackboard pattern provides effective solutions for designing and implementing complex systems where heterogeneous modules have to be dynamically combined to solve a problem. This provides non-functional properties such as: * reusability * changeability * robustness. The blackboard pattern allows multiple processes to work closer together on separate threads, polling and reacting when necessary.See also
* Blackboard system *Software design pattern
In software engineering, a software design pattern is a general, reusable solution to a commonly occurring problem within a given context in software design. It is not a finished design that can be transformed directly into source or machine code ...
References
{{DEFAULTSORT:Design Pattern (Computer Science) Software design patterns