By Willem-Jan van den Heuvel
Disbursed company part computing—the assembling of commercial parts into digital enterprise approaches, which have interaction through the Internet—caters to a brand new breed of firm structures which are versatile, fairly effortless to keep up and improve to deal with new company methods, and comparatively basic to combine with different company structures. businesses with unwieldy, huge, and heterogeneous inherited details systems—known as legacy systems—find it super tough to align their outdated structures with novel enterprise methods. Legacy platforms will not be in basic terms tightly intertwined with latest company procedures and methods but in addition have a brittle structure after years of ad-hoc fixes and supply constrained openness to different platforms. during this publication, Willem-Jan van den Heuvel offers a methodological framework that gives pragmatic strategies for aligning component-based company strategies and legacy platforms.
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Additional info for Aligning Modern Business Processes and Legacy Systems: A Component-Based Perspective
2 Managing the Evolution of Enterprise Applications mation techniques may be found in Arnold (1993) and Seacord, Plakosh, and Lewis (2003). To implement the encapsulation and integration (black-box) strategy, it suffices to recreate an understanding of the abstract services that are offered by a legacy system, database, or user interface. Particularly, legacy applications and database repositories may be encapsulated and accessed using adapters, which allow new application components to coexist with encapsulated legacy systems.
Such quality attributes are difficult to quantify and thus are not incorporated in the component interface. Quality attributes modeled in interfaces thus have the following characteristics. They are externally visible, concerned with services, and quantifiable. In some cases, quantifiability is lifted to allow fuzzy attributes, for instance, cardinal values characterized as high, medium, low. A prominent language for modeling quality attributes is QML (qualityof-service modeling language), introduced by Frølund and Koistinen (1998).
However, SOA’s principles may be equally well implemented with other (older) programming languages or middleware platforms such as CORBA, DCOM, and CICS. Core elements of SOA include the following (Papazoglou and Georgakopoulos 2003; Endrei et al. 2004; Arsanjani 2004): Services are logical entities that may be implemented using coarse-grained, distributed, Web-enabled components, which leverage large-scale customization and allow low-cost composition. The specification of a service is described in a standard manner, stating its global purpose, capabilities, and other metadata, including contact information.