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Type of design pattern
In software engineering, the blackboard pattern is a behavioral design pattern[1] 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.[2][1]
This pattern was identified by the members of the Hearsay-II project and first applied to speech recognition.[2]
The blackboard model defines three main components:
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.[2]
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.[2]
System Structure[2]Usage-domains include:
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:
The blackboard pattern allows multiple processes to work closer together on separate threads, polling and reacting when necessary.[1]
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