“Composable Futures with Akka ” features Java and Scala code examples. The book is available in PDF format. Akka is hot, and Akka. Writing concurrent programs that can run in multiple threads and on multiple cores is crucial but daunting. Composable futures provide a convenient abstraction. Composable Futures With Akka is intended for ‘the rest of us’ – Java and Scala programmers who would like to quickly learn how design.
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This book explains how to write concurrent programs that can run in multiple threads and on multiple cores. A chapter is dedicated to java.
An overview of futures is provided through code examples.
Composable Futures with Akka 2.0
Special considerations for programming with futures are discussed. The book provides complete reference information about the classes and methods for working with Akka futures.
Each method of the Akka futures implementation is covered in detail; zkka introduced with short explanation, then followed by the Java signature and the Scala signature. Further information for programming in each language is provided, usually with code snippets. Dozens of complete working code examples are provided with the book, at least one per method in each language.
Similar programs were written in Java and Scala.
Futures • Akka Documentation
If you know Java and are learning Scala, comparing the two programs will be instructive. You can also use the SBT console to try code snippets interactively. Composable Futures with Akka 2. Practical code examples are used to teach concepts, backed up by ‘just enough’ theory.
You should either be familiar with programming using Java generics or some Scala before reading this book. Java programmers do not require prior experience with Scala; Scala programmers do not need to know Java.
Some familiarity with git is assumed. Multicore concurrency requires multi-threaded programming, but that is hard to do properly. In general, futures are preferred for one-off, uncoordinated, stateless jobs, which can range in duration from a web request of 5ms to data processing jobs of hours or more. Actors are generally preferred for coordinated or stateful activities.
The Co,posable and Twitter implementations are much more advanced. For example, transformations and operations on collections of futures composabke supported, along with numerous asynchronous callbacks. Akka futures is integrated with Akka actors for distributed computing.
The futures implementation bundled in the free, open source Akka stack is written in Scala. Akka futures has a Java API, and it provides Java programs with almost every bit of the same futures capability available to Scala programs.
The Promises chapter in the book includes a case study that shows how easy it is to integrate Akka futures into existing code. Existing projects can use this technique to rapidly leverage the extra functionality of Akka futures, and thereby extend the functionality of legacy software.
Composable futures mean that operations on a future or a collection of futures can be chained together without blocking; for example, transformations such as map can be applied to a composable future. The value of an Akka Future will normally become available sometime after creation, or it may cmoposable an exception raised during computation.
Akka Futures can also be preset to a value futurfs exception when created. Both blocking and non-blocking operations can be performed on Akka futures. The futures implementation provided by Akka 1.
Mike Slinn is a principal at Micronautics Research Corp- orationa contract software development firm that focuses on cutting-edge enterprise software technology.
Mike is akkaa hands-on architect who enjoys programming and mentoring. He is often engaged to turn around projects and can provide interim technical leadership for companies in transition. He has been recognized as a software expert in US federal court.
Mike has consulted on many legal cases and performed project failure analysis, and has researched and testified in cases involving intellectual property issues such as patent infringement and trade secret misappropriation.
About Contents Change history No longer available. About The Author Mike Slinn is a principal at Micronautics Research Corp- orationa contract software development firm that focuses on cutting-edge enterprise software technology. Mike has written three books and over fifty articles on software technology.
The code is provided as a git repository, which you can update any time. Target Audience Composable Futures with Akka 2. When to use futures and when to use actors?
Other implementations of futures are limited. Java and Scala can both use Akka Futures The futures implementation bundled in the free, open source Akka stack is written in Scala. Akka futures integrate easily with existing software projects. What are composable futures? Akka futures are being subsumed into Scala 2.