Object Oriented Design

Download Aspect-Oriented Database Systems by Awais Rashid PDF

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By Awais Rashid

Recently, a brand new set of software program improvement recommendations has develop into to be had, jointly termed Aspect-Oriented software program improvement (AOSD). This goals to aid the modularization of systemic homes (also often called crosscutting matters) and their next composition with the opposite elements of a method.

Rashid makes a speciality of using Aspect-Oriented Programming (AOP) suggestions to modularize differently greatly scoped beneficial properties in database platforms, corresponding to the evolution or the versioning version, to enhance their customizability, extensibility and maintainability. He exhibits how using AOP can remodel the way in which we enhance, use and keep database platforms. He additionally discusses how database structures can aid AOP by means of delivering a way for the garage and retrieval of aspects.

"Aspect-Oriented Database platforms" indicates the potential synergy among AOP and database structures, and is of specific curiosity to researchers, graduate scholars and software program builders in database structures and applications.

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2 Crosscutting Concerns at Database Level 47 DBMS level. As a result propagation of customisation results in an increased maintenance overhead at the database level. ) and meta-classes - residing in an object database. Examples of these relationships are: • • • • association and aggregation relationships among objects; version derivation links among object or class versions; inheritance relationships among classes (or their versions); scoping relationships between classes and their members. Traditionally object databases use attributes to embed relationship information within the entities hence spreading the relationships across them.

Top-level transactions satisfy the ACID properties with respect to other top-level transactions while child transactions preserve atomicity, consistency, isolation and durability with respect to each other. , cooperative transactions (Zhang, Kambayashi, et al. 1999) relax the basic ACID properties to allow a transaction to observe the internal state of other transactions. For traditional data-oriented, record processing database applications, the basic flat transaction model or the nested transaction model tends to be satisfactory.

However, while patterns give a name to certain crosscutting structures, unlike AOP they do not capture the concern explicitly in program form. Furthermore, patterns are not available or suitable for all cases and mostly provide only partial solutions to the code tangling problem. Fig. 2 uses object-oriented programming as an example (note that AOP is not limited to object-orientation) to demonstrate how crosscutting concerns lead to code tangling and the effectiveness of AOP in addressing such concerns.

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