By Kumar Gupta Munish
A useful, step by step consultant to benefit and construct Akka's actor-based, allotted, concurrent, and scalable Java applications
* construct huge, allotted, concurrent, and scalable purposes utilizing the Akka's Actor model
* uncomplicated and transparent analogy to Java/JEE program improvement international to give an explanation for the concepts
* each one bankruptcy will educate you an idea through explaining it with transparent and lucid examples– each one bankruptcy could be learn independently
Developers/Architects have to deal with the positive stability among the ever expanding load and ever lowering reaction latency. purposes must be designed for web scale, this means that you should be expert in development huge dispensed, scalable, and concurrent functions. even if you're construction the following fb or operating for a Fortune 500 association, try to be able to layout scalable, concurrent, and fault-tolerant purposes. Akka is a toolkit and runtime for development hugely concurrent, disbursed, and fault-tolerant event-driven purposes at the JVM.
"Akka Essentials" will convey you the present demanding situations with Java Scalability and concurrency version and the way Akka's Actor version will help layout and construct functions which are inherently scalable and fault-tolerant. no matter if you're construction new purposes or are looking to refactor an latest program, you are going to research the precise strategies to construct and scale up in no time.
What you are going to study from this book
* Scale up and out your purposes utilizing dispatchers and remoting
* construct fault tolerance inside your application
* deal with transactions inside of your application
* Unit try out your Akka applications
* combine your Akka functions with latest company structures utilizing Zeromq
* visual display unit the health and wellbeing of your Akka application
This is a step by step advisor the place each one bankruptcy will train you an idea by way of explaining it with transparent and lucid examples– every one bankruptcy could be learn independently.
Who this ebook is written for
This booklet is geared toward builders, architects who're construction huge disbursed concurrent and scalable functions utilizing Java/Scala. The e-book assumes wisdom of Java/JEE recommendations yet no wisdom of Actor version is assumed.
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Extra info for Akka Essentials
Protected methods can override methods that do not have access modifiers. , package, public, private, protect ed) than the original method. • The overriding method cannot throw any new checked ex‐ ceptions. 46 | Chapter 5: Object-Oriented Programming Constructors Constructors are called upon object creation and are used to in‐ itialize data in the newly created object. Constructors are op‐ tional, have exactly the same name as the class, and they do not have a return in the body (as methods do).
Default Values Default values are the values assigned to instance variables in Java, when no initialization value has been explicitly set. , those declared at the class level) have a default value of null. null references nothing. , those declared within a method) do not have a default value, not even a value of null. Always initialize local variables because they are not given a default value. Checking an 32 | Chapter 4: Reference Types uninitialized local variable object for a value (including a value of null) will result in a compile-time error.
Table 4-1. Reference types Reference type Brief description Annotation Provides a way to associate metadata (data about data) with program elements. Array Provides a fixed-size data structure that stores data elements of the same type. Class Designed to provide inheritance, polymorphism, and encapsulation. Usually models something in the real world and consists of a set of values that holds data and a set of methods that operates on the data. Enumeration A reference for a set of objects that represents a related set of choices.