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M&P H5J Concepts and Facilities

Posted on March 4, 2013 by Herman Dolder
Last modified on May 25, 2015

M&P is a Framework for the development of high complexity applications that demand:

  • optimal users interaction
  • maximum cross-platform portability
  • distributed processing on Internet
  • parallel processing
  • the use of mobile devices
  • maximum adaptability to changing requirements

M&P provides a modular dynamic dataflow architecture that uses plug-and-play components.

M&P is implemented in two platforms: H5J (HTML5 TypeScript) and .NET.

In this article we describe the main concepts and facilities of the H5J platform but those of the .NET are very similar.

M&P TBW (The BLOCKS World)

"M&P" means "Modular and Parallel", and also "Modular and Portable". The term "Modular" refers to the fact that the development is done using interchangeable plug-and-play components, which we call BLOCKS.

The H5J platform enables us to develop "ultraportable" modular applications based in HTML5 (see).

Architecture

The basic architecture of H5J is, by design, similar to that of MS Silverlight including an XAML processor coded in TypeScript (Javascript). See " Silverlight in HTML5 ".

BLOCKS

In M&P we seek to implement a paradigm, similar to the well known "LEGO® bricks", in which applications are built by connecting BLOCKS, creating networks of BLOCKS.


 

M&P provides a set of "native" BLOCKS as well as the means  for the rapid creation of "custom" BLOCKS.

Declarative composition

The M&P XAML Processor named BXaml can instantiate BLOCKS, HTML5 Elements and SVG Elements allowing the  declarative composition of applications.

BXaml supports all aspects of an application, not only those related to the User Interface.

The BLOCKS may also be instantiated using Typescript (Javascript) code.

M&P Runtime Library

Basically a BLOCK is an instance of a TypeScript class that implements interfaces that allows the BLOCK to automatically integrate and interoperate with the M&P Runtime Library (MPRTL).

The BXaml processor is part of the MPRTL and the BLOCK components are interconnected by means of the databinding facilities of the MPRTL.

Implicit Parallelism

The concept of Implicit Parallelism is central in the M&P architecture and the MPRTL operation is parallel by default.

M&P supports the paradigm "all asynchronous - all parallel" by means of a component called "Task Parallel Engine" (TPE).

The TPE considers the traditional synchronous processing a particular case of parallel processing.

TPE Dataflow

M&P uses the facilities of the TPE engine to implement a Concurrent Dataflow Platform (TPEDF).

The TPEDF define Dataflow BLOCKS that are instantiated in BXaml allowing declarative composition.

Also TPEDF uses the databinding facilities of the MPRTL.

BLOCKS inside BLOCKS

A BLOCK may contain (nest) a set of BLOCKS, HTML5 Elements and SVG Elements. This facility allows to implement multiple levels of abstraction (as many as appropriate).

The BLOCKS inside BLOCKS facility is the main facility in M&P for organizing (and reorganizing) code to manage complexity.

The BLOCKS inside BLOCKS facility allows to implement the concepts of Information-hiding and Complexity-hiding. This facility also allows to create custom visual controls (User Controls) for the User Interface.

An M&P application is a BLOCK containing BLOCKS in multiple levels. We call this top BLOCK "TopBoard".

The MPRTL is also composed of BLOCKS.

Dynamic Loading BLOCKS (Plugins)

In an M&P application some (as many as appropriate) BLOCKS can be loaded dynamically on demand. The dynamically loadable BLOCKS are of two types: XPlugins (non-visual BLOCKS) and XViews (visual BLOCKS).

H5J Parallel Processing - Multicoring

H5J operates in Javascript (ECMAScript) and uses "WebWorkers" when available (currently WebWorkers are not available in Android, and are not native in Node.js).

When WebWorkers are not available the TPE can emulate parallelism.

Distributed Processing

M&P provides peer-to-peer (P2P) channels for communication over Internet. M&P channels are BLOCKS  that encapsulate "WebSockets".

Interface Based Programming

M&P architecture is fully based on well-defined interfaces.

In the interoperation between them BLOCKS reference only interfaces and not BLOCKS.

If several BLOCKS implement the same interface they are considered to be functionally interchangeable (polymorphic behaviour).

The availability of interchangeable BLOCKS allows to easily and quickly reconfigure an application to adapt to different circumstances.

The interchangeability of BLOCKS allows the "ahead-of-Time" adaptation of the applications.

Scripting

M&P provides an Scripting language called BScript whose syntax and semantics is similar to that of the LISP language.

The BScript expressions are executed by the ultraportable BScript interpreter of M&P.

The BScript expressions can be created dynamically.

M&P includes a data type called BSX to contain the internal representation of an BScript expression.

BScript provides a native set of functions which is normally extended by the application designer.

BScript is the dynamic and interactive language of M&P and provides a simple mechanism for interactive unit  tests using the BScript console.

Scripting is a very important facility for application adaptability.

BSX objects

BSX objects play a fundamental role in the architecture of distributed processing of M&P which is based on the remote evaluation of BSXs.

BSXs are serializable/deserializable very fast to a format that ensures maximum communication end storage performance.

The serialized BSXs can be stored in Files and Data Bases.

H5J Windowing system

To build the user interface H5J provides a windowing system based on "stacked" popup windows that allows multitasking.

An H5J application uses a single web static page which allows the login and whose content is then changed (by dynamically loading and displaying XView BLOCKS) by the application using the facilities of the windowing system.

See some BXaml H5J images ...

Networks of Servers

M&P allows to organize "networks of servers" that communicate between them and with the clients through P2P channels. M&P introduces the concept of " Servers as BLOCKS" (SaB).

See also

 

 

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