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Advanced Programming Language Technology for Reflective Dynamic ...

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Java also allows dynamic class loading providing a heavyweight yet effective mechanism for runtime pro. gram adaptation. The programming language Dylan ...

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Advanced Programming Language Technology for Reflective Dynamic Adaptive SoftwarePage 1Advanced Programming Language Technology forReflective Dynamic Adaptive SoftwareGregory T. Sullivan & Jonathan R. BachrachArtificial Intelligence LaboratoryMassachusetts Institue Of TechnologyCambridge Massachusetts 02139http://www.ai.mit.eduThe Problem: Software produced with current technology is typically opaque and brittle. That is applications adaptpoorly to changes in environment (OS hardware data profile) or intended use scale poorly and are difficult to debugmaintain and enhance. As the scale and complexityof applicationsattempted by the software developmentcommunityas a whole and by the artificial intelligence research community in particular grow software needs to be developedwith the ability to adapt to a complex dynamic environment.Motivation: We are developing an infrastructure to support the addition of advanced language features to the toolsetavailable to programmers. We are focusing on: Reflection dynamism and metaprogramming: Reflection refers to the ability of an application to introspectat runtime on its internal state both data and control. Examples include examining the class hierarchy at runtime or using runtime profile information to find performance bottlenecks. Based on analysis of data gatheredusing runtime reflection an application may want to dynamically adapt its behavior or internal structure thisis what we refer to as dynamism. Reflection and dynamism enable a form of programming called metaprogramming: writing programs that reason about and modify the behavior of themselves and/or other programs. Syntactic extension: Based on ideas from the Lisp and Dylan programming languages we are designing apowerful procedural macro facility for Java.Previous Work: The most successful attempt at adding a high degree of reflection and dynamism to the programming infrastructure is the metaobject protocol (MOP) of the Common Lisp Object System (CLOS) 12]. As f ...

Source: www.ai.mit.edu

 

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