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The observer pattern is a software design pattern in which an object, named the subject, maintains a list of its dependents, called observers, and notifies them automatically of any state changes, usually by calling one of their methods.

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rdf:type	disease
rdfs:label	Observer pattern (en)
rdfs:comment	The observer pattern is a software design pattern in which an object, named the subject, maintains a list of its dependents, called observers, and notifies them automatically of any state changes, usually by calling one of their methods. (en)
sameAs	Observer pattern Observer pattern
dbp:wikiPageUsesTemplate	dbt:Code dbt:Reflist dbt:Design_Patterns_Patterns dbt:Wikibooks-inline
Subject	Articles with example C Sharp code Articles with example Java code Articles with example Python (programming language) code Software design patterns
gold:hypernym	Pattern
prov:wasDerivedFrom	http://en.wikipedia.org/wiki/Observer_pattern?oldid=1070267312&ns=0
Wikipage page ID	164863 (xsd:integer)
page length (characters) of wiki page	20657 (xsd:nonNegativeInteger)
Wikipage revision ID	1070267312 (xsd:integer)
Link from a Wikipage to another Wikipage	Progress bar Unified Modeling Language Sequence diagram Articles with example C Sharp code Articles with example Java code Articles with example Python (programming language) code Software design patterns Dispose pattern Java (programming language) Method (computer programming) Object (computer science) Painter's algorithm Python (programming language) Class diagram Client–server model Publish–subscribe pattern Software design pattern Entity component system Epoll Implicit invocation Scalability Design Patterns Weak reference Event (computing) Memory leak Lapsed listener problem Mediator pattern Multiprocessing Polling (computer science) Singleton pattern
has abstract	The observer pattern is a software design pattern in which an object, named the subject, maintains a list of its dependents, called observers, and notifies them automatically of any state changes, usually by calling one of their methods. It is mainly used for implementing distributed event handling systems, in "event driven" software. In those systems, the subject is usually named a "stream of events" or "stream source of events", while the observers are called "sinks of events". The stream nomenclature alludes to a physical setup where the observers are physically separated and have no control over the emitted events from the subject/stream-source. This pattern then perfectly suits any process where data arrives from some input that is not available to the CPU at startup, but instead arrives "at random" (HTTP requests, GPIO data, user input from keyboard/mouse/..., distributed databases and blockchains, ...). Most modern programming-languages comprise built-in "event" constructs implementing the observer-pattern components. While not mandatory, most 'observers' implementations would use background threads listening for subject-events and other support mechanisms provided by the kernel (Linux epoll, ...). (en)
foaf:isPrimaryTopicOf	http://en.wikipedia.org/wiki/Observer_pattern
is Wikipage redirect of	Observer Pattern Event listeners Observer design pattern
is Link from a Wikipage to another Wikipage of	Node.js ODP ASP.NET Accelerator (software) Actor model Behavioral pattern Binding properties pattern COMEFROM Callback (computer programming) Object-oriented programming Objective-C Observer Observer Pattern Change data capture Circular dependency Client–server model Cross-cutting concern Håvard Fjær Grip Comparison of C Sharp and Java Dynamic Data Exchange Entity component system Frontend and backend Fuchsia (operating system) Graphical Editing Framework Immutable object Implicit invocation Design Patterns Internet of things Inversion of control Mama (software) Model–view–controller Monad (functional programming) Event-driven messaging Event (computing) Iterator pattern Lapsed listener problem Libsigc++ Mediator pattern Loop-switch sequence Event listeners Observer design pattern

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