Applied Akka Patterns

Fortunately, the solution is not a new paradigm of development, but rather an old one. With this hands-on guide, Java and Scala developers will learn how to embrace concurrent and distributed applications with the open source Akka toolkit.

Applied Akka Patterns

Author: Michael Nash

Publisher: "O'Reilly Media, Inc."

ISBN: 1491934832

Page: 198

View: 469

When it comes to big data processing, we can no longer ignore concurrency or try to add it in after the fact. Fortunately, the solution is not a new paradigm of development, but rather an old one. With this hands-on guide, Java and Scala developers will learn how to embrace concurrent and distributed applications with the open source Akka toolkit. You’ll learn how to put the actor model and its associated patterns to immediate and practical use. Throughout the book, you’ll deal with an analogous workforce problem: how to schedule a group of people across a variety of projects while optimizing their time and skillsets. This example will help you understand how Akka uses actors, streams, and other tools to stitch your application together. Model software that reflects the real world with domain-driven design Learn principles and practices for implementing individual actors Unlock the real potential of Akka with patterns for combining multiple actors Understand the consistency tradeoffs in a distributed system Use several Akka methods for isolating and dealing with failures Explore ways to build systems that support availability and scalability Tune your Akka application for performance with JVM tools and dispatchers

Scala Applied Machine Learning

This pattern is documented in a blog post by Derek Wyatt (http://letitcrash.com/
post/30165507578/shutdownpatterns-in-akka-2). ... We will give brief
descriptions, but you can refer to the Akka documentation for more details: • The
ask operator, ...

Scala Applied Machine Learning

Author: Pascal Bugnion

Publisher: Packt Publishing Ltd

ISBN: 178712455X

Page: 1265

View: 687

Leverage the power of Scala and master the art of building, improving, and validating scalable machine learning and AI applications using Scala's most advanced and finest features About This Book Build functional, type-safe routines to interact with relational and NoSQL databases with the help of the tutorials and examples provided Leverage your expertise in Scala programming to create and customize your own scalable machine learning algorithms Experiment with different techniques; evaluate their benefits and limitations using real-world financial applications Get to know the best practices to incorporate new Big Data machine learning in your data-driven enterprise and gain future scalability and maintainability Who This Book Is For This Learning Path is for engineers and scientists who are familiar with Scala and want to learn how to create, validate, and apply machine learning algorithms. It will also benefit software developers with a background in Scala programming who want to apply machine learning. What You Will Learn Create Scala web applications that couple with JavaScript libraries such as D3 to create compelling interactive visualizations Deploy scalable parallel applications using Apache Spark, loading data from HDFS or Hive Solve big data problems with Scala parallel collections, Akka actors, and Apache Spark clusters Apply key learning strategies to perform technical analysis of financial markets Understand the principles of supervised and unsupervised learning in machine learning Work with unstructured data and serialize it using Kryo, Protobuf, Avro, and AvroParquet Construct reliable and robust data pipelines and manage data in a data-driven enterprise Implement scalable model monitoring and alerts with Scala In Detail This Learning Path aims to put the entire world of machine learning with Scala in front of you. Scala for Data Science, the first module in this course, is a tutorial guide that provides tutorials on some of the most common Scala libraries for data science, allowing you to quickly get up to speed building data science and data engineering solutions. The second course, Scala for Machine Learning guides you through the process of building AI applications with diagrams, formal mathematical notation, source code snippets, and useful tips. A review of the Akka framework and Apache Spark clusters concludes the tutorial. The next module, Mastering Scala Machine Learning, is the final step in this course. It will take your knowledge to next level and help you use the knowledge to build advanced applications such as social media mining, intelligent news portals, and more. After a quick refresher on functional programming concepts using REPL, you will see some practical examples of setting up the development environment and tinkering with data. We will then explore working with Spark and MLlib using k-means and decision trees. By the end of this course, you will be a master at Scala machine learning and have enough expertise to be able to build complex machine learning projects using Scala. This Learning Path combines some of the best that Packt has to offer in one complete, curated package. It includes content from the following Packt products: Scala for Data Science, Pascal Bugnion Scala for Machine Learning, Patrick Nicolas Mastering Scala Machine Learning, Alex Kozlov Style and approach A tutorial with complete examples, this course will give you the tools to start building useful data engineering and data science solutions straightaway. This course provides practical examples from the field on how to correctly tackle data analysis problems, particularly for modern Big Data datasets.

Akka Cookbook

In this recipe, we learned how to use the Master-Worker (or Slave) work pulling
pattern. This pattern is usually applied to gain control over the flow of incoming
messages to be able to distribute the load more evenly and act when it is not ...

Akka Cookbook

Author: Hector Veiga Ortiz

Publisher: Packt Publishing Ltd

ISBN: 1785288369

Page: 414

View: 860

Learn how to use the Akka framework to build effective applications in Scala About This Book Covers a discussion on Lagom—the newest launched Akka framework that is built to create complex microservices easily The recipe approach of the book allows the reader to know important and independent concepts of Scala and Akka in a seamless manner Provides a comprehensive understanding of the Akka actor model and implementing it to create reactive web applications Who This Book Is For If you are a Scala developer who wants to build scalable and concurrent applications, then this book is for you. Basic knowledge of Akka will help you take advantage of this book. What You Will Learn Control an actor using the ContolAware mailbox Test a fault-tolerant application using the Akka test kit Create a parallel application using futures and agents Package and deploy Akka application inside Docker Deploy remote actors programmatically on different nodes Integrate Streams with Akka actors Install Lagom and create a Lagom project In Detail Akka is an open source toolkit that simplifies the construction of distributed and concurrent applications on the JVM. This book will teach you how to develop reactive applications in Scala using the Akka framework. This book will show you how to build concurrent, scalable, and reactive applications in Akka. You will see how to create high performance applications, extend applications, build microservices with Lagom, and more. We will explore Akka's actor model and show you how to incorporate concurrency into your applications. The book puts a special emphasis on performance improvement and how to make an application available for users. We also make a special mention of message routing and construction. By the end of this book, you will be able to create a high-performing Scala application using the Akka framework. Style and approach This highly practical recipe-based approach will allow you to build scalable, robust, and reactive applications using the Akka framework.

Reactive Messaging Patterns with the Actor Model

Applications and Integration in Scala and Akka Vaughn Vernon. modify its
behavior in preparation for future messages. ... Parallelism is concurrency but
applied to achieving a single goal. Parallelism is achieved by dividing a single
complex ...

Reactive Messaging Patterns with the Actor Model

Author: Vaughn Vernon

Publisher: Addison-Wesley Professional

ISBN: 0133846873

Page: 496

View: 112

USE THE ACTOR MODEL TO BUILD SIMPLER SYSTEMS WITH BETTER PERFORMANCE AND SCALABILITY Enterprise software development has been much more difficult and failure-prone than it needs to be. Now, veteran software engineer and author Vaughn Vernon offers an easier and more rewarding method to succeeding with Actor model. Reactive Messaging Patterns with the Actor Model shows how the reactive enterprise approach, Actor model, Scala, and Akka can help you overcome previous limits of performance and scalability, and skillfully address even the most challenging non-functional requirements. Reflecting his own cutting-edge work, Vernon shows architects and developers how to translate the longtime promises of Actor model into practical reality. First, he introduces the tenets of reactive software, and shows how the message-driven Actor model addresses all of them–making it possible to build systems that are more responsive, resilient, and elastic. Next, he presents a practical Scala bootstrap tutorial, a thorough introduction to Akka and Akka Cluster, and a full chapter on maximizing performance and scalability with Scala and Akka. Building on this foundation, you’ll learn to apply enterprise application and integration patterns to establish message channels and endpoints; efficiently construct, route, and transform messages; and build robust systems that are simpler and far more successful. Coverage Includes How reactive architecture replaces complexity with simplicity throughout the core, middle, and edges The characteristics of actors and actor systems, and how Akka makes them more powerful Building systems that perform at scale on one or many computing nodes Establishing channel mechanisms, and choosing appropriate channels for each application and integration challenge Constructing messages to clearly convey a sender’s intent in communicating with a receiver Implementing a Process Manager for your Domain-Driven Designs Decoupling a message’s source and destination, and integrating appropriate business logic into its router Understanding the transformations a message may experience in applications and integrations Implementing persistent actors using Event Sourcing and reactive views using CQRS Find unique online training on Domain-Driven Design, Scala, Akka, and other software craftsmanship topics using the for{comprehension} website at forcomprehension.com.

Scala Functional Programming Patterns

Grok and perform effective functional programming in Scala About This Book Understand functional programming patterns by comparing them with the traditional object-oriented design patterns Write robust, safer, and better code using the ...

Scala Functional Programming Patterns

Author: Atul S. Khot

Publisher: Packt Publishing Ltd

ISBN: 1783985852

Page: 298

View: 427

Grok and perform effective functional programming in Scala About This Book Understand functional programming patterns by comparing them with the traditional object-oriented design patterns Write robust, safer, and better code using the declarative programming paradigm An illustrative guide for programmers to create functional programming patterns with Scala Who This Book Is For If you have done Java programming before and have a basic knowledge of Scala and its syntax, then this book is an ideal choice to help you to understand the context, the traditional design pattern applicable, and the Scala way. Having previous knowledge of design patterns will help, though it is not strictly necessary. What You Will Learn Get to know about functional programming and the value Scala's FP idioms bring to the table Solve day-to-day programming problems using functional programming idioms Cut down the boiler-plate and express patterns simply and elegantly using Scala's concise syntax Tame system complexity by reducing the moving parts Write easier to reason about concurrent code using the actor paradigm and the Akka library Apply recursive thinking and understand how to create solutions without mutation Reuse existing code to compose new behavior Combine the object-oriented and functional programming approaches for effective programming using Scala In Detail Scala is used to construct elegant class hierarchies for maximum code reuse and extensibility and to implement their behavior using higher-order functions. Its functional programming (FP) features are a boon to help you design “easy to reason about” systems to control the growing software complexities. Knowing how and where to apply the many Scala techniques is challenging. Looking at Scala best practices in the context of what you already know helps you grasp these concepts quickly, and helps you see where and why to use them. This book begins with the rationale behind patterns to help you understand where and why each pattern is applied. You will discover what tail recursion brings to your table and will get an understanding of how to create solutions without mutations. We then explain the concept of memorization and infinite sequences for on-demand computation. Further, the book takes you through Scala's stackable traits and dependency injection, a popular technique to produce loosely-coupled software systems. You will also explore how to currying favors to your code and how to simplify it by de-construction via pattern matching. We also show you how to do pipeline transformations using higher order functions such as the pipes and filters pattern. Then we guide you through the increasing importance of concurrent programming and the pitfalls of traditional code concurrency. Lastly, the book takes a paradigm shift to show you the different techniques that functional programming brings to your plate. This book is an invaluable source to help you understand and perform functional programming and solve common programming problems using Scala's programming patterns. Style and approach This is a hands-on guide to Scala's game-changing features for programming. It is filled with many code examples and figures that illustrate various Scala idioms and best practices.

1st World Congress on Genetics Applied to Livestock Production Symposia

WORLD CONGREES ON GENETICS APPLIED TO LIVESTOCK PRODUCTION (
1974, Madrid, Spain) ... LITERATURE CITED CASPERSSON , T .; LOMAKKA , G.
, and ZECH , L. ( 1971 ) : The 24 fluorescence patterns of the human metaphase
 ...

1st World Congress on Genetics Applied to Livestock Production  Symposia

Author: 1. WORLD CONGREES ON GENETICS APPLIED TO LIVESTOCK PRODUCTION (1974, Madrid, Spain)

Publisher:

ISBN:

Page: 958

View: 135

V.2 - Round tables.

A Companion to Buddhist Philosophy

But when you can bear unpleasant sensations, you can bring attention into
reactive patterns and the reactive emotions ... Unfortunately the terms vitakka and
vicara, translated here as “applied and sustained thought,” are obscure, and their
 ...

A Companion to Buddhist Philosophy

Author: Steven M. Emmanuel

Publisher: John Wiley & Sons

ISBN: 1118323882

Page: 760

View: 216

A Companion to Buddhist Philosophy is the most comprehensive single volume on the subject available; it offers the very latest scholarship to create a wide-ranging survey of the most important ideas, problems, and debates in the history of Buddhist philosophy. Encompasses the broadest treatment of Buddhist philosophy available, covering social and political thought, meditation, ecology and contemporary issues and applications Each section contains overviews and cutting-edge scholarship that expands readers understanding of the breadth and diversity of Buddhist thought Broad coverage of topics allows flexibility to instructors in creating a syllabus Essays provide valuable alternative philosophical perspectives on topics to those available in Western traditions

Africa

Irregular isolated patterns , as on this piece , have also been applied to wooden
objects , such as on a Mangbetu painted ... associated with the aesthetics of both
the Mangbetu and the Mbuti or Sua Pygmies ( called Akka by the Mangbetu ) .

Africa

Author: Royal Academy of Arts (Great Britain)

Publisher: Prestel Pub

ISBN:

Page: 613

View: 302

Catalogus bij een expositie van Afrikaanse kunst.

Semitic Noun Patterns

Afroasiatic evidence from outside Semitic is not introduced , 23 and techniques of
internal reconstruction are applied to ... It is the characterization of PS as a
theoretical structure rather than a language that allows patterns to be
reconstructed as entities in their own right . ... 703 ; “ Akkadisches und libysches
Verbum , ” pp .

Semitic Noun Patterns

Author: Joshua Fox

Publisher: Harvard Semitic Studies

ISBN:

Page: 361

View: 394

The heart of the book is devoted to studies of all individual reconstructible internal patterns with their Semitic reflexes, including mono- and bisyllabics and patterns with ungeminated or geminated second or third consonants.".

The Academy

It was not till 1885 , apparently , the Development of Institutions , as applied
propitiating the spirit of the deceased . ... useless to the matters , such as the
difference between loom the Akka skeletons sent over by Emin Pasha . yielding
these substances . ... and feeling : PART II . of the Annual Report of the Board of
These results or patterns consist of marks and Regents of the Smithsonian
Institution for ...

The Academy

Author:

Publisher:

ISBN:

Page:

View: 217

Proceedings

When a contrast enhancement filter is used to emphasize the banding pattern ,
the requantization error is also enhanced . To reduce the ... Figure 11 shows the
maximum relative deviation as function of 10 applying the interpolation method .
Notice that for 10 ... 115-126 . 3. Caspersson , T. , G. Lomakka , L. Zech , The 24 ...

Proceedings

Author:

Publisher:

ISBN:

Page: 884

View: 286

Indian Books in Print

338.9459 ANDHRA PRADESH NATIONAL COUNCIL OF APPLIED ECONOMIC
RESEARCH ( Now Dolhi ) . ... Growth of public expenditure in India , 1872-1968 :
A secular and time pattern analysis . ... 15.00 . - Report on family living survey
among industrial workers , 1958-59 . Mundakkayam . Delhi , Manager of Pub .

Indian Books in Print

Author:

Publisher:

ISBN:

Page:

View: 704

Chromosome Variations in Human Evolution

The patterns of these bands reflect some ( as yet poorly understood ) aspect of
basic chromosome structure . They are characteristic ... The first line of work
referred to above was initiated by Caspersson and his colleagues in Stockholm (
see Caspersson , Lomakka and Zech 1971 ) . ... Applied to human chromosomes
( Fig .

Chromosome Variations in Human Evolution

Author: Anthony J. Boyce

Publisher:

ISBN:

Page: 131

View: 532

Acta Geneticae Medicae Et Gemellologiae

In our experiments the method showed a relatively consistent banding pattern in
several metaphases . ... Unlike the mouse satellite - DNA which is limited to the
centromeric heterochromatin , whose differential staining with AO has been
successfully applied by Stockert ( 1972 ) ... Caspersson T. , Lomakka G. , Zech L.
1971.

Acta Geneticae Medicae Et Gemellologiae

Author:

Publisher:

ISBN:

Page:

View: 613

Biometrics

Bayes theorem applied to chromosome classification . Computers ... Computer
analysis of Giemsa banding patterns and automatic classification of human
chromosomes . ... Møller , A. , Nilsson , H. , Caspersson , T. and Lomakka , G. (
1972 ) ...

Biometrics

Author:

Publisher:

ISBN:

Page:

View: 945