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middleware
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File:Linux kernel and gaming input-output latency.svg|thumb|Anything between the kernel and user applications is considered middleware.]]Middleware is computer software that provides services to software applications beyond those available from the operating system. It can be described as "software glue".WEB, What is Middleware?,weblink Defining Technology, Middleware.org, 2008, 2013-08-11, unfit,weblink" title="web.archive.org/web/20120629211518weblink">weblink June 29, 2012, Middleware makes it easier for software developers to implement communication and input/output, so they can focus on the specific purpose of their application. It gained popularity in the 1980s as a solution to the problem of how to link newer applications to older legacy systems, although the term had been in use since 1968.WEB, Nick, Gall,weblink Origin of the term middleware, July 30, 2005,

In distributed applications

(File:Middleware Schema.svg|thumb|Software architecture: Middleware)The term is most commonly used for software that enables communication and management of data in distributed applications. An IETF workshop in 2000 defined middleware as "those services found above the transport (i.e. over TCP/IP) layer set of services but below the application environment" (i.e. below application-level APIs).WEB,weblink Home, IETF, In this more specific sense middleware can be described as the dash ("-") in client-server, or the -to- in peer-to-peer. Middleware includes web servers, application servers, content management systems, and similar tools that support application development and delivery.BOOK,weblink Introduction to Middleware: Web Services, Object Components, and Cloud Computing, Etzkorn, L. H., CRC Press, 4–5, 2017, 9781498754101, ObjectWeb defines middleware as: "The software layer that lies between the operating system and applications on each side of a distributed computing system in a network."WEB, Sacha, Krakowiak,weblink What's middleware?, 2005-05-06, ObjectWeb.org, yes,weblink" title="web.archive.org/web/20050507151935weblink">weblink 2005-05-07, Services that can be regarded as middleware include enterprise application integration, data integration, message oriented middleware (MOM), object request brokers (ORBs), and the enterprise service bus (ESB).BOOK,weblink Event Processing for Business: Organizing the Real-Time Enterprise, Luckham, D. C., John Wiley & Sons, 27–28, 2011, 9781118171851, Database access services are often characterised as middleware. Some of them are language specific implementations and support heterogeneous features and other related communication features.BOOK,weblink Open Client/Server Computing and Middleware, Simon, A. R., Wheeler, T., Academic Press, 43–49, 2014, 9781483214276, Examples of database-oriented middleware include ODBC, JDBC and transaction processing monitors.BOOK,weblink Data Center Fundamentals, Arregoces, M., Portolani, M., Cisco Press, 92–93, 2003, 9781587140747, Distributed computing system middleware can loosely be divided into two categories—those that provide human-time services (such as web request servicing) and those that perform in machine-time. This latter middleware is somewhat standardized through the Service Availability ForumWEB,weblink PDF, Service Availability Interface Specification, Service Availability Forum, 30 September 2011, 26 July 2018, and is commonly used in complex, embedded systems within telecom, defense and aerospace industries.BOOK,weblink Service Availability: Principles and Practice, Foreword, Jokiaho, T., Fryer, J., John Wiley & Sons, xv, 2012, 9781119941675,

Other examples

The term middleware is used in other contexts as well. Middleware is sometimes used in a similar sense to a software driver, an abstraction layer that hides detail about hardware devices or other software from an application.
  • The Android operating system uses the Linux kernel at its core, and also provides an application framework that developers incorporate into their applications. In addition, Android provides a middleware layer including libraries that provide services such as data storage, screen display, multimedia, and web browsing. Because the middleware libraries are compiled to machine language, services execute quickly. Middleware libraries also implement device-specific functions, so applications and the application framework need not concern themselves with variations between various Android devices. Android's middleware layer also contains the ART virtual machine and its core Java application libraries.Charlie Collins, Michael Galpin and Matthias Kaeppler, Android in Practice, Manning Publications, 2011
  • Game engine software such as Gamebryo and RenderWare are sometimes described as middleware, because they provide many services to simplify game development.BOOK, Introduction to the Game Industry, Moore, M. E., Pearson Prentice Hall, 169, 2006, 9780131687431,
  • In simulation technology, middleware is generally used in the context of the high level architecture (HLA) that applies to many distributed simulations. It is a layer of software that lies between the application code and the run-time infrastructure. Middleware generally consists of a library of functions, and enables a number of applications—simulations or federates in HLA terminology—to page these functions from the common library rather than re-create them for each application.BOOK,weblink Chapter 4: Middleware, Cooperative Environments for Distributed Systems Engineering: The Distributed Systems Environment Report, Becchini, R., Chilaev, P., Krivtsov, V., etal, Drira, K., Martelli, A., Villemur, T., Springer, 41–4, 2003, 9783540455820,
  • Wireless networking developers can use middleware to meet the challenges associated with a wireless sensor network (WSN). Implementing a middleware application allows WSN developers to integrate operating systems and hardware with the wide variety of various applications that are currently available.Hadim, S. and Mohamed, N. (2006). Middleware challenges and approaches for wireless sensor networks. IEEE Distributed Systems Online vol 7. Issue 3. Retrieved March 4, 2009 from
iEEE Distributed Systems Online
  • The QNX operating system offers middleware for providing multimedia services for use in automobiles, aircraft and other environments.WEB,weblink QNX Software Joins Internet ITS Consortium of Japan, QNX News Releases, QNX, 6 May 2008, 26 July 2018,
  • Radio-frequency identification (RFID) software toolkits provide middleware to filter noisy and redundant raw data.BOOK,weblink RFID Essentials, Glover, B., Bhatt, H., O'Reilly Media, 38–44, 2006, 9780596009441,

See also

References

{{Reflist|30em}}

External links

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