By Andrea Maglie
Examine reactive programming utilizing Java and its sensible facets, also known as RxJava. This booklet indicates you the way to resolve «callback hell» with RxJava and exhibits you ways to jot down thread-safe code with out placing onto kingdom variables which turns out to be useful for cloud computing software-as-a-service concerns, specially while facing enormous facts approaches via streaming. Reactive Java Programming contains specified assurance of reactive Android programming, transforming into an increasing number of well known in cellular improvement with the Cloud. After studying this advisor to reactive programming, youll have the capacity to use it on your personal colossal info cloud functions that use Java.
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Extra resources for Reactive Java Programming
Sample text
You start with a finite sequence of integers, and this sequence can be created using just or range. Then you apply the filter operator, passing a function that returns true if the emitted integer is odd. println("next item: " + item); } }); EXAMPLE: FIBONACCI SEQUENCE You want to create a method that takes an integer n and outputs the Fibonacci sequence F(n). First, you create an observable that emits a sequence of n integers: Observable. range(n) is the perfect candidate for this role. Second, you apply a function on each of these items, and you use the map operator to do so.
SkipLast: Suppresses the last n items emitted by an Observable. • takeLast: Emits only the last n items emitted by an Observable. Operators for Combining Observables • And/Then/When: Combines sets of items emitted by two or more observables by means of pattern and plan intermediaries; these operators are not part of the RxJava library but can be found in the RxJavaJoins library. com/ReactiveX/ RxJavaJoins) • combineLatest: When an item is emitted by either of two Observables, it combines the latest item emitted by each Observable via a specified function and emits items based on the results of this function.
And so on. It will stop when the shortest sequence stops. println("next item is: " + s); } }); In this example, the zip operator takes two sequences as inputs and a function that simply takes two integers and builds a string. 7 sequence completed! As you can see, the emitted sequence stops when the shortest sequence stops, and in this case the shortest sequence is the first one (1,2,3). concat The concat operator (Figure 2-5) concatenates two or more emissions, generating one emission where all the items from the first source emission appear before the items of the second source emission.
Reactive Java Programming by Andrea Maglie
by Daniel
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