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Middleware is a type of computer software program that provides services to software applications beyond those available from the operating system. It can be described as "software glue".

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.

In distributed applications

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). In this more specific sense middleware can be described as the hyphen ("-") 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.

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." 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).

Database access services are often characterised as middleware. Some of them are language specific implementations and support heterogeneous features and other related communication features. Examples of database-oriented middleware include ODBC, JDBC, and transaction processing monitors.

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 Forum and is commonly used in complex, embedded systems within the telecom, defence, and aerospace industries.

Usage of middleware

Many categories of middleware have been defined, based on the field in which it is used or the application module it serves. In recent bibliography, the main categories of middleware are the following:

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.

See also


  1. ^ "Middleware conference". middleware-conf.github.io. Retrieved 2023-12-16. Middleware is a distributed-system software that resides between applications and underlying platforms (operating systems; databases; hardware), and/or ties together distributed applications, databases or devices. Its primary role is to coordinate and enable communication between different layers or components while isolating much of the complexity of distribution into a single, well tested and well understood system abstraction.
  2. ^ "What is Middleware?". Middleware.org. Defining Technology. 2008. Archived from the original on June 29, 2012. Retrieved 2013-08-11.{{cite web}}: CS1 maint: unfit URL (link)
  3. ^ Gall, Nick (July 30, 2005). "Origin of the term middleware". Retrieved May 21, 2008.
  4. ^ Etzkorn, L. H. (2017). Introduction to Middleware: Web Services, Object Components, and Cloud Computing. CRC Press. pp. 4–5. ISBN 9781498754101.
  5. ^ Krakowiak, Sacha. "What's middleware?". ObjectWeb.org. Archived from the original on 2005-05-07. Retrieved 2005-05-06.
  6. ^ Luckham, D. C. (2011). Event Processing for Business: Organizing the Real-Time Enterprise. John Wiley & Sons. pp. 27–28. ISBN 9781118171851.
  7. ^ Simon, A. R.; Wheeler, T. (2014). Open Client/Server Computing and Middleware. Academic Press. pp. 43–49. ISBN 9781483214276.
  8. ^ Arregoces, M.; Portolani, M. (2003). Data Center Fundamentals. Cisco Press. pp. 92–93. ISBN 9781587140747.
  9. ^ "Service Availability Interface Specification" (PDF). Service Availability Forum. 30 September 2011. Retrieved 26 July 2018.
  10. ^ Jokiaho, T.; Fryer, J. (2012). "Foreword". Service Availability: Principles and Practice. John Wiley & Sons. p. xv. ISBN 9781119941675.
  11. ^ Gazis, Alexandros; Katsiri, Eleftheria (15 March 2022). "Middleware 101: What to know now and for the future". ACM Digital Library. doi:10.1145/3526211. S2CID 247494415.
  12. ^ Charlie Collins, Michael Galpin and Matthias Kaeppler, Android in Practice, Manning Publications, 2011
  13. ^ Moore, M. E. (2006). Introduction to the Game Industry. Pearson Prentice Hall. p. 169. ISBN 9780131687431.
  14. ^ Becchini, R.; Chilaev, P.; Krivtsov, V.; et al. (2003). "Chapter 4: Middleware". In Drira, K.; Martelli, A.; Villemur, T. (eds.). Cooperative Environments for Distributed Systems Engineering: The Distributed Systems Environment Report. Springer. pp. 41–4. ISBN 9783540455820.
  15. ^ 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 Archived 2011-09-28 at the Wayback Machine
  16. ^ "QNX Software Joins Internet ITS Consortium of Japan". QNX News Releases. QNX. 6 May 2008. Retrieved 26 July 2018.
  17. ^ Glover, B.; Bhatt, H. (2006). RFID Essentials. O'Reilly Media. pp. 38–44. ISBN 9780596009441.