By Anneke Kleppe, Jos Warmer, Wim Bast
Skilled program builders usually make investments extra time in construction types than they do in really writing code. Why? Well-constructed versions enable you to carry huge, advanced company structures on time and inside finances. Now, a brand new framework complicated by way of the thing administration crew (OMG) permits builders to construct platforms in keeping with their middle company common sense and data-independently of any specific undefined, working approach, or middleware.Model pushed structure (MDA) is a framework according to the Unified Modeling Language (UML) and different criteria for visualizing, storing, and changing software program designs and types. even if, not like UML, MDA promotes the production of machine-readable, hugely summary versions which are constructed independently of the implementation expertise and saved in standardized repositories. There, they are often accessed many times and immediately remodeled by way of instruments into schemas, code skeletons, attempt harnesses, integration code, and deployment scripts for varied platforms.Written via 3 participants of OMG's MDA standardization committee, MDA defined offers readers an within examine some great benefits of MDA and the way they are often learned. This publication starts with functional examples that illustrate the applying of alternative forms of types. It then shifts to a dialogue on the meta-level, the place builders will achieve the data essential to outline MDA tools.Highlights of this e-book include:# The MDA framework, together with the Platform self sustaining version (PIM) and Platform particular version (PSM)# OMG criteria and using UML# MDA and Agile, severe Programming, and Rational Unified approach (RUP) improvement# tips to practice MDA, together with PIM-to-PSM and PSM-to-code adjustments for Relational, company JavaBean (EJB), and internet versions# adjustments, together with controlling and tuning, traceability, incremental consistency, and their implications# Metamodeling# Relationships among varied criteria, together with Meta item Facility (MOF), UML, and item Constraint Language (OCL)The introduction of MDA deals concrete how you can enhance productiveness, portability, interoperability, upkeep, and documentation dramatically. With this groundbreaking booklet, IT pros can learn how to faucet this new framework to convey company platforms such a lot successfully.
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Extra info for MDA Explained. The Model Driven Architecture: Practice and Promise
Example text
Business rules can be specified using OCL, including dynamic triggers. The dynamics of the system can be expressed by pre- and post-conditions on operations. For relatively simple operations the body of the corresponding operation might be generated from the post-condition, but most of the time the body of the operation must be written in the PSM. In that case, generating code for the pre- and post-condition ensures that the code written in the PSM conforms to the required specification in the PIM.
Communication bridge between EJB and relational models The bridge between the Web model and the EJB model is constituted by the links to the EJB key classes and EJB components as shown in Figure 5-4. Note that both communication bridges are relationships between the PSMs. This relationship will need to be preserved when the PSMs are transformed into code. 5 Summary As pointed out earlier, the MDA especially pays off when the transformation process is not trivial, or when the transformation is well-known but involves much work.
If we are able to use these models in an MDA fashion, they can be used to generate PSMs and code. When we configure RUP for an MDA project, we need to make sure that the models that we produce fulfill the requirements that MDA puts on them. When we do this, the models used in RUP are no longer bureaucratic overhead; they become "real" software development. The balance between writing paper documents and developing code moves more into the direction of developing code. At the same time, the artifacts that are produced will satisfy project managers in their quest for keeping control.