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M&P BLOCKS inside BLOCKS

Posted on March 16, 2013 by Herman Dolder
Last modified on February 19, 2014.

An M&P BLOCK may contain internally a set of BLOCKS, HTML5 Elements and SVG Elements. This facility allows to implement multiple levels of abstraction (as many as appropriate).

 

 

The Application BLOCKTree

An M&P application is a BLOCK containing BLOCKS in multiple levels. We name this top BLOCK the
"TopBoard" of the application, and the entire structure the "BLOCK Tree".

The concept of BOARD

Each BLOCK in the BLOCKS Tree is a "BOARD". And each BLOCK belongs to a BOARD.

The set of BLOCK that belongs to a BOARD is its "blockset". A BOARD can contain an "empty blockset".

The Main Facility of M&P

In M&P we seek to maximize the adaptability of the application throughout its entire life cycle.

The BLOCKS inside BLOCKS facility is the "main facility" of M&P for organizing (and reorganizing) an application and managing complexity. It facilitates the "evolutive refactoring" of applications.

Two important abstraction concepts implementation

The BLOCKS inside BLOCKS facility allows us to implement two important abstraction concepts
strongly related with adaptability:

  • Information-hiding and
  • Complexity-hiding.

The Information-hiding concept

It consists of encapsulating aspects of the application in BLOCKS in such a way that its functionality is accessible only through predefined stable interfaces to allow the contents of the BLOCK to evolve without impacting the operation of other BLOCKS.

The Complexity- hiding concept

The concept of Complexity-hiding is a complement of the concept of Information-hiding. It has to do with the understanding of the structure and behavior of the application by the people who must perform its maintenance and extension.

The following idea is useful for introduce the concept:

"When something, that we know is complex, looks simple in an stage, it usually means there’s something interesting going on in the back-stage".

from which we derive:

"To make the stage look simple, hide the complexity in the back-stage"

and using BLOCKS World terminology:

"To make a BOARD look simple, hide the complexity in lower level BOARDS".

See also

 

 

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