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Separation of Distribution Concerns in Distributed Java Programming

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Distributed design decisions in a distributed Java program. crosscut the module structure of ... from nondistributed Java program for enhancing the mod ...

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Separation of Distribution Concerns in Distributed Java ProgrammingPage 1Separation of Distribution Concernsin Distributed Java ProgrammingMichiaki TatsuboriDoctoral Program in Engineering University of TsukubaTennohdai 111 Tsukuba Ibaraki 3058573 Japanmt@is.tsukuba.ac.jpABSTRACTDistribute d design decisions in a distributed Java programcrosscut the module structure of nondistributed concerns inthe program. We propose a tool supporting aspectorienteddistributed programming with which programmers can specify the distribution aspect of program simply and separatelyfrom nondistributed Java program for enhancing the modularity of program. The aspectweaver of this tool is a bytecode translator implemented as a customized class loader ofJava virtual machine (JVM). Thus the tool is applicable tocode supplied by thirdparties without source code and theresulting distributed program runs on regular JVMs.KeywordsDistributed programming bytecode translation Java loadtime weaving aspectoriented programming1. PROBLEM DESCRIPTIONObjectoriented modularization with classes often fails toencapsulate distributed design decisions that crosscut themodule structure of nondistributed concerns in a distributedprogram. Code related to distributed concerns is often tangled with other code and scatters over a number of classes.Lack of modularization implies low maintainability of theprogram which makes programming difficult. For exampleprogrammers often change the decomposing points of program in distributed environment for reducing the overheadof network communication. But such the change of designdecision brings about changing remote or local object allocation code scattering over the program. Programmers haveto modify a number of code pieces for implementing a simplechange of distributed design decisions.Design patterns3] are useful for solving design problems butthey are not almighty. Though programmers can modularize some part of their program using several programmingtechniques found in ...

Source: www.research.ibm.com

 

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