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: 970

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

A common Akka pattern is to define the messages that an actor can receive in the
actor's companion object: Let's change the actor definition to accept these
messages: class. // EchoActor.scala object EchoActor { case object EchoHello
case ...

Scala Applied Machine Learning

Author: Pascal Bugnion

Publisher: Packt Publishing Ltd

ISBN: 178712455X

Page: 1265

View: 638

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: 460

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.

Parallel Processing and Applied Mathematics

Message passing model in Anemone is similar to Akka, as they both use shared
memory to implement it. ... modeling actors as functions, similarly to Erlang –
actor control similar to Akka – message handling through pattern matching.

Parallel Processing and Applied Mathematics

Author: Roman Wyrzykowski

Publisher: Springer

ISBN: 3319780549

Page: 488

View: 633

The two-volume set LNCS 10777 and 10778 constitutes revised selected papers from the 12th International Conference on Parallel Processing and Applied Mathematics, PPAM 2017, held in Lublin, Poland, in September 2017. The 49 regular papers presented in the proceedings were selected from 98 submissions. For the workshops and special sessions, that were held as integral parts of the PPAM 2017 conference, a total of 51 papers was accepted from 75 submissions. The papers were organized in topical sections named as follows: Part I: numerical algorithms and parallel scientific computing; particle methods in simulations; task-based paradigm of parallel computing; GPU computing; parallel non-numerical algorithms; performance evaluation of parallel algorithms and applications; environments and frameworks for parallel/distributed/cloud computing; applications of parallel computing; soft computing with applications; and special session on parallel matrix factorizations. Part II: workshop on models, algorithms and methodologies for hybrid parallelism in new HPC systems; workshop power and energy aspects of computations (PEAC 2017); workshop on scheduling for parallel computing (SPC 2017); workshop on language-based parallel programming models (WLPP 2017); workshop on PGAS programming; minisymposium on HPC applications in physical sciences; minisymposium on high performance computing interval methods; workshop on complex collective systems.

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: 310

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.

The Epic of Paln u

44 Akka Pinakka, it will be remembered, is the daughter of Sivasingala Raju and
Sivanagala Devi. ... woman who was respected for the same reasons, or that
there was a Saivite tradition of women devotees on this pattern. The term 'Akka' is
also applied to Goddesses, but here 'Akka Pinakka' appears to be a human.

The Epic of Paln     u

Author: Gene Henry Roghair

Publisher: Oxford University Press

ISBN: 9780198154563

Page: 399

View: 369

The Epic of Paln du

... but it is more likely that she is another woman who was respected for the same
reasons , or that there was a Saivite tradition of women devotees on this pattern .
The term ' ' Akka " is also applied to village Goddesses , but here''Akka Pinakka ...

The Epic of Paln  du

Author: Gene Henry Roghair

Publisher:

ISBN:

Page: 726

View: 478

General Pattern Theory

A Mathematical Study of Regular Structures Ulf Grenander, Emeritus Professor
Division of Applied Mathematics Ulf Grenander ... T ; x ? n Now since I is the
smallest eigenvalue of AQA = AKKA it is also the smallest eigenvalue of KAAK .

General Pattern Theory

Author: Ulf Grenander

Publisher: Oxford University Press on Demand

ISBN:

Page: 899

View: 388

The aim of pattern theory is to create mathematical knowledge representations of complex systems, analyse the mathematical properties of the resulting regular structures, and to apply them to practically occuring patterns in nature and the man-made world. Starting from an algebraic formulation of such representations they are studied in terms of their topological, dynamical and probabilistic aspects. Patterns are expressed through their typical behaviour as well as through their variability around their typical form. Employing the representations (regular structures) algorithms are derived for the understanding, recognition, and restoration of observed patterns. The algorithms are investigated through computer experiments.

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: 248

Concurrent Application Development using Akka with Scala

This book is a practical guide to use Akka along with power of Scala to design business solutions for scalability, fault tolerant concurrent systems.

Concurrent Application Development using Akka with Scala

Author: Meetu Maltiar

Publisher: Apress

ISBN: 9781430258964

Page: 300

View: 979

Building scalable, concurrent systems is hard. Think parallelism and we think about threads. Using threads for parallelism is not only difficult but also not scalable. You can only create a certain number of threads on a box. On the other hand you can create a million Akka actors on a box. Also it is difficult to scale out (parallel scaling) using threads. Any multi threaded application likely has the keyword synchronized peppered throughout the code base. It does not follow any pattern which makes the code base and application difficult to manage and it also indicates the difficulty in managing threads. The Akka framework has brought Actors to the Java virtual machine. Actors way of doing parallelism is way simpler than multi-threaded applications. Scala is a modern programming language for the Java Virtual Machine (JVM) that combines the best features of object-oriented and functional programming languages. Using Scala one can write concise programs with the power of concurrency. Since Scala runs on the JVM, it can access any Java library and is interoperable with Java frameworks. This book is a practical guide to use Akka along with power of Scala to design business solutions for scalability, fault tolerant concurrent systems. It introduces the topics of concurrency, Scala and Akka which are then blended together to provide a solution on steroids for modern day web scale applications. What you’ll learn Scala, SBT: Functional concepts, starting a project in Scala using sbt Akka Toolkit: Actors, Futures, FSM, TestKit Akka Clusters (upcoming and latest addition) Application of technical concepts to business problems A list of business situations which can benefit by leveraging the stack Who this book is for It is meant for Java and Scala developers, architects and product development teams. It is also meant for stakeholders who wish to see what business problems can be solved easily with this stack.

Journal of Applied Mechanics

Department of Mochanical Engineering , Akla University , Akka 010 , Japan
Introduction The separation and ... The flow pattern in the separated and
reattached regions was measured and the boundary - layer characteristics of the
flow ...

Journal of Applied Mechanics

Author:

Publisher:

ISBN:

Page:

View: 569

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: 589

Catalogus bij een expositie van Afrikaanse kunst.

Scala for Machine Learning

... implementation of the hidden Markov model, and conditional random fields
applied to pattern recognition in financial ... scalable applications for machine
learning such as Scala parallel collections, Akka, and the Apache Spark
framework.

Scala for Machine Learning

Author: Patrick R. Nicolas

Publisher: Packt Publishing Ltd

ISBN: 178355875X

Page: 520

View: 321

Are you curious about AI? All you need is a good understanding of the Scala programming language, a basic knowledge of statistics, a keen interest in Big Data processing, and this book!

Annual Report

Assessment of crosses , in which the Akka x Feebar lines had been used as one
of the parents , suggested that a selection method based on two - tow ear - type
and the appropriate electrophoretic pattern could be successfully applied in a ...

Annual Report

Author: Scottish Crop Research Institute

Publisher:

ISBN:

Page:

View: 972

Nature

... the , J. Arthur Thomson , 2 407 Stuhlmann ( Dr. ) , Two Akka Girls brought to
Germany by , 470 Technical Education , Dr. W. Anderson ... 95 ; Carnot's sistant
Curator in , IIT Principle Applied to Animal and Vegetable Lise , J. Parker ,
Sydney , Royal Society of New South ... L. Weber , 497 cent Frost Patterns , 162
Thermometer , Platinum , Determination of Low Temperature Synchronisation ,
Problem of ...

Nature

Author: Sir Norman Lockyer

Publisher:

ISBN:

Page:

View: 644

The Builder

THAN FICTION . proceed to state some of the important facts prior to the
separation of the primitive Akka- REMARKS AS TO THE ... The progress
Prominent parts of the surface have been name applied by each was that of the
word for of the seaward driftway , as the ... datum level , such as mother goddess ,
the Babylonian Cybelé , which graven pattern which has been filled in with high -
water line .

The Builder

Author:

Publisher:

ISBN:

Page:

View: 331

National Car and Locomotive Builder

This applies also to The “ Journal of Political Economy " is the name of a from
Jaffa , gives the following outline of further prosthe handles on ... Starting from
Haifa , with a short 8 - mile branch round the famous bay of Acre to Akka , inatters
that must eventually ( and not in the ... the cenners , making and laying off
patterns , drawing tools ; intury dies , civilization and commerce will have pushed
were built .

National Car and Locomotive Builder

Author:

Publisher:

ISBN:

Page:

View: 108

Annual Report on Research and Technical Work of the Department of Agriculture for Northern Ireland

The fungicides Bayleton , Tilt , Vigil , Sportak and Mistral were applied either on 9
or 18 June or on both dates . ... Georgie ( BMR2 + 4 ) while the least affected
were Wing ( BMR6 ) , Mazurka ( BMR2 + 6 ) , Tyra ( BMR7 ) and Akka ( BMR8 ) .
Results were similar to those of 1979 and the general pattern seemed to indicate
that the cultivars most frequently grown determine the overall virulence frequency
.

Annual Report on Research and Technical Work of the Department of Agriculture for Northern Ireland

Author: Great Britain. Department of Agriculture for Northern Ireland

Publisher:

ISBN:

Page:

View: 972