Benefits of The Approach
A key benefit of the DASL language approach over 3rd generation (3GL) programming languages is that enterprise applications can be specified in a very concise and precise way that expresses the application logic clearly. A small enterprise application in DASL can typically be implemented in 8-10K lines of DASL code, which the DASL compiler then typically translates into 200K lines of Java, XML, SQL, and other implementation artifacts. The 200K line figure is typical of equivalent applications written using 3GLs.
The conciseness of DASL can be seen also in terms of the content of the two representations (DASL vs. the generated application code in Java/XML/SQL etc.). Most of the DASL code describes business logic and business processes specific to the application, independent of the deployment middleware, frameworks, and presentation mechanisms. This core business logic typically represents only 2-5% of the generated application code. Thus, writing, understanding, and maintaining the application code is much easier at the DASL level than it is at the level of the generated code, in which the business logic is scattered within various implementation artifacts.
Another advantage of using DASL to write applications, rather than conventional 3rd generation languages and IDEs is that the DASL code is independent of middleware, GUI presentation frameworks, network topology, and other implementation technologies. As new middleware and frameworks are developed and evolve, existing DASL programs can be migrated to them without the need to re-implement them.
For example, the original DASL code generators produced traditional HTML screens. Later, DASL code generators were written to use frameworks such as Apache Struts, and technologies such as JavaScript in the browser, to produce a more interactive experience. Today, new DASL generators being written that produce Rich Internet applications. Existing DASL applications can thus be converted to rich internet applications by recompiling them with the latest code generators.
Read more about this topic: Distributed Application Specification Language
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