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This page uses Groovy-like pseudocode for its examples, but there are ReactiveX implementations in many languages.

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Issues ReactiveX

This page explains what the reactive pattern is and what Observables and observers are (and how observers subscribe to Observables). Other pages show how you use the variety of Observable operators to link Observables together and change their behaviors.

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Issues

In ReactiveX an observer subscribes to an Observable. Then that observer reacts to whatever item or sequence of items the Observable emits. This pattern facilitates concurrent operations because it does not need to block while waiting for the Observable to emit objects, but instead it creates a sentry in the form of an observer that stands ready to react appropriately at whatever future time the Observable does so.

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onNext, onCompleted, and onError

The Subscribe method is how you connect an observer to an Observable. Your observer implements some subset of the following methods:

onNext
An Observable calls this method whenever the Observable emits an item. This method takes as a parameter the item emitted by the Observable.
onError
An Observable calls this method to indicate that it has failed to generate the expected data or has encountered some other error. It will not make further calls to onNext or onCompleted. The onError method takes as its parameter an indication of what caused the error.
onCompleted
An Observable calls this method after it has called onNext for the final time, if it has not encountered any errors.

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In the asynchronous model the flow goes more like this:

Define a method that does something useful with the return value from the asynchronous call; this method is part of the observer.
Define the asynchronous call itself as an Observable.
Attach the observer to that Observable by subscribing it (this also initiates the actions of the Observable).
Go on with your business; whenever the call returns, the observer’s method will begin to operate on its return value or values — the items emitted by the Observable.

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Observable

See Also

Single — a specialized version of an Observable that emits only a single item
Rx Workshop: Introduction
Introduction to Rx: IObservable
Mastering observables (from the Couchbase Server documentation)
2 minute introduction to Rx by Andre Staltz (“Think of an Observable as an asynchronous immutable array.”)
Introducing the Observable by Jafar Husain (JavaScript Video Tutorial)
Observable object (RxJS) by Dennis Stoyanov
Turning a callback into an Rx Observable by @afterecho

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