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  • Book Overview & Buying C++ Reactive Programming
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C++ Reactive Programming

C++ Reactive Programming

By : Praseed Pai, Abraham
3 (8)
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C++ Reactive Programming

C++ Reactive Programming

3 (8)
By: Praseed Pai, Abraham
Buy this Book

Overview of this book

Reactive programming is an effective way to build highly responsive applications with an easy-to-maintain code base. This book covers the essential functional reactive concepts that will help you build highly concurrent, event-driven, and asynchronous applications in a simpler and less error-prone way. C++ Reactive Programming begins with a discussion on how event processing was undertaken by different programming systems earlier. After a brisk introduction to modern C++ (C++17), you’ll be taken through language-level concurrency and the lock-free programming model to set the stage for our foray into the Functional Programming model. Following this, you’ll be introduced to RxCpp and its programming model. You’ll be able to gain deep insights into the RxCpp library, which facilitates reactive programming. You’ll learn how to deal with reactive programming using Qt/C++ (for the desktop) and C++ microservices for the Web. By the end of the book, you will be well versed with advanced reactive programming concepts in modern C++ (C++17).
Table of Contents (15 chapters)
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Preface
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Preface
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Who this book is for
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What this book covers
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To get the most out of this book
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Get in touch
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1
Reactive Programming Model – Overview and History
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Reactive Programming Model – Overview and History
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Event-driven programming model
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Reactive programming model
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Functional reactive programming
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The key interfaces of a reactive program
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Pull-versus push-based reactive programming
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Converting events to IObservable<T>
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The philosophy of our book
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Summary
2
A Tour of Modern C++ and its Key Idioms
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A Tour of Modern C++ and its Key Idioms
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The key concerns of the C++ programming language
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Enhancements to C++ for writing better code
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Composing functions together with the pipe operator
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Miscellaneous features
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Range-based for loops and observables
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Summary
3
Language-Level Concurrency and Parallelism in C++
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Language-Level Concurrency and Parallelism in C++
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What is concurrency?
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Hello World of concurrency (using std::thread)
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Managing threads
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Using Lambdas
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Sharing data between threads
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A thread-safe stack data structure
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Summary
4
Asynchronous and Lock-Free Programming in C++
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Asynchronous and Lock-Free Programming in C++
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Task-based parallelism in C++
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C++ memory model
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Memory access and concurrency
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The modification contract
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Atomic operations and types in C++
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Atomic types
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Memory ordering
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A lock-free data structure  queue
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Summary
5
Introduction to Observables
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Introduction to Observables
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The GoF Observer pattern
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The limitations of the GoF Observer pattern
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A holistic look at GoF patterns
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The OOP programming model and hierarchies
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A Composite/Visitor pattern for expression processing
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Flattening the composite for iterative processing
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Map and filter operations on the list
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Reversing the gaze for Observables!
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Summary
6
Introduction to Event Stream Programming Using C++
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Introduction to Event Stream Programming Using C++
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What is Stream programming model?
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Applied Stream programming using the Streams library
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Lazy evaluation
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Event Stream programming
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Summary
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Introduction to Data Flow Computation and the RxCpp Library
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Introduction to Data Flow Computation and the RxCpp Library
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The data flow computation paradigm
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An introduction to the RxCpp library
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Creating Observables from the scratch
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An introduction to marble diagrams for visual representation
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RxCpp (Stream) Operators
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A peek into the things we haven't covered yet
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Summary
8
RxCpp – the Key Elements
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RxCpp – the Key Elements
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Observables
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Observers and their variants (Subscribers)
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Subjects
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Schedulers
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Operators
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Summary
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Reactive GUI Programming Using Qt/C++
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Reactive GUI Programming Using Qt/C++
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A quick introduction to Qt GUI programming
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Hello World – Qt program
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Qt event model with signals/slots/MOC – an example
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Integrating the RxCpp library with the Qt event model
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Summary
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Creating Custom Operators in RxCpp
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Creating Custom Operators in RxCpp
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Philosophy of Rx operators
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Chaining stock operators
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Writing basic RxCpp custom operators
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Different genres of custom operators
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Writing custom operators that can be chained
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Summary
11
Design Patterns and Idioms for C++ Rx Programming
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Design Patterns and Idioms for C++ Rx Programming
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The OOP and Design patterns movement
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Key Pattern catalogs
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The Design pattern redux
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From Design patterns to Reactive programming
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The Cell pattern
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The Active object pattern
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The Resource Loan pattern
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The Event bus pattern
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Summary
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Reactive Microservices Using C++
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Reactive Microservices Using C++
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The C++ language and web programming
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The C++ REST SDK
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Testing the HTTP server using CURL and POSTMAN
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The JSON and HTTP protocol
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The C++ REST SDK-based REST server
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Invoking REST services using the RxCurl library
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A word about the Reactive micro-services architecture
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Summary
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Advanced Streams and Handling Errors
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Advanced Streams and Handling Errors
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A short recap of the characteristics of a reactive system
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RxCpp error and exception handling Operators
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Schedulers and error handling
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Event-based Stream handling – some examples
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Summary
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Other Books You May Enjoy
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Other Books You May Enjoy
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Leave a review - let other readers know what you think

The Resource Loan pattern

The Loan pattern, as the  name suggest, loans a resource to a function  In the example given below, a file handle is loaned to consumers of the class. It performs following steps:

  1. It creates a resource that you can use (a file handle )
  2. It loans the resource (file handle ) to functions  (lambdas) that will use it
  3. This function is passed by the caller and executed by the resource holder
  4. The resource (file handle ) is closed or destroyed  by the resource holder

 

 

The following code implements the Resource Loan pattern for resource management. The pattern helps to avoid resource leakage when writing code:

//----------- ResourceLoan.cpp 
#include <rxcpp/rx.hpp> 
using namespace std; 
////////////////////////// 
// implementation of Resource Loan  Pattern. The Implementation opens a file 
// and does not pass the file handle to user  defined Lambda. The Ownership remains with 
// the class  
class ResourceLoan { 
   FILE *file;  // This is the resource which is being...
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C++ Reactive Programming
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