Add reactive-programming to trial

radar/2017-10-01/reactive-programming.md

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+---
+title:      "Reactive Programming"
+ring:       trial
+quadrant:   methods-and-patterns
+
+---
+
+Classic (web-) applications are typically composed of transactions that submit
+big forms to the server side that processes these and in response returns HTML
+for the browser to render. Todays applications are having more and more
+fine-grained 'real-time' like aspects: A simple modification of a form field
+could trigger a complete roundtrip to the server including other services and
+persistence. And all of these transactions should of course respect the
+expectations of a user who wants a highly interactive appliation.
+
+"Reactive Programming" tries to provide an answer to the above posed challanges
+by raising the level of abstraction that allows you to focus on the stream of
+events that make up your business logic in an responsive asynchronous fashion.
+
+There are various descriptions of what Reactive Programming actually is - at
+the most general level it is programming with asynchronous data streams and
+having tools to create, manipulate, combine and filter these streams. Under
+"Reactive Programming" we summarize the principles and implementations that
+underly [ReactiveX](http://reactivex.io/) and the [Reactive
+Manifesto](https://www.reactivemanifesto.org/). 
+
+"Reactive Programming" is employed in many of our services - frontend and
+backend - but not always as an explicitly choosen pattern. As different
+plattforms have different means to tackle this style of programming we choose
+to include "Reactive Programming" as a general Method and Patterns Item in
+addition to concrete libraries and APIs like
+[Rx.JS](languages-and-frameworks/rxjs.html) or [Akka
+Streams](/languages-and-frameworks/akka-streams.html) to highlight the
+importance of the approach in general.