活动文件:一种将遗留应用程序集成到分布式系统中的机制

P. Dasgupta, Ayal Itzkovitz, V. Karamcheti
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引用次数: 5

摘要

尽管互联网信息源越来越分散,具有不同的存储格式和访问控制约束,但大多数从这些信息源查看和操作数据的终端应用程序(例如过滤器和媒体播放器)都是在传统的基于文件的界面上操作的。需要重写这些遗留应用程序以访问远程源,或者需要依赖于在执行遗留应用程序之前将数据聚合到被动文件中的临时中间应用程序。本文提出了一种简单、优雅、可编程的方法,允许将遗留应用程序自然地集成到分布式系统基础设施中。这种方法称为“活动文件”,它允许将多个信息源封装为充当其逻辑代理的本地文件。该本地文件通过哨兵进程访问,哨兵进程在文件打开时自动启动,聚合来自多个源的数据,并过滤对该文件的所有访问。更重要的是,将活动文件集成到客户机应用程序中是透明的:活动文件实际上与常规文件无法区分。活动文件可以在分布式和非分布式系统中找到各种各样的应用程序。我们将讨论活动文件、它们的语义、它们的用法以及它们在Windows NT中的实现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Active files: a mechanism for integrating legacy applications into distributed systems
Despite increasingly distributed Internet information sources with diverse storage formats and access-control constraints, most of the end applications (e.g. filters and media players) that view and manipulate data from these sources operate against a traditional file-based interface. These legacy applications need to be rewritten to access remote sources, or need to rely upon ad-hoc intermediary applications that aggregate the data into a passive file before executing the legacy application. This paper presents a simple, elegant, programmable method for allowing natural integration of legacy applications into distributed system infrastructures, The approach, called "active files", enables multiple information sources to be encapsulated as a local file that serves as their logical proxy. This local file is accessed though a sentinel process, which automatically starts when the file is opened, aggregates data from multiple sources, and filters all access to and from the file. More importantly, the integration of active files into client applications is transparent: an active file is virtually indistinguishable from a regular file. Active files find a variety of applications in both distributed and non-distributed systems. We discuss active files, their semantics, their usage and their implementations in Windows NT.
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