00_helloservice

00_helloservice Project Overview

The 00_helloservice project is a foundational example from the AREG SDK, designed to demonstrate how to build an application using Inter-Process Communication (IPC) and multithreading only by changing the Application Model. This project showcases the creation and interaction of service (micro-server) and client objects, illustrating various deployment scenarios (various models) within the AREG framework.

Key Concepts

• Service and Client Objects: Learn how to implement service providers and consumers using the AREG Framework.
• Service Interface: Utilize the Service Interface document and code generator to automate Object Remote Procedure Call (Object RPC) message creation and dispatching, enhancing efficiency and simplifying communication between host and remote target.
• Multithreading: Understand how services and clients can coexist or run independently across threads.
• IPC (Inter-Process Communication): Explore scenarios where service provider and consumer reusable objects communicate across multiple processes using Object RPC.
• Scalable Architecture: The example demonstrates different deployment strategies, from single-threaded setups to more complex multiprocess applications only by changing Application Model.

Project Structure

1. 00_generated:

   • This library contains files automatically created from the HelloService.siml Service Interface. The files are generated during CMake setup or as a pre-build step in Visual Studio. The generated code simplifies and automates the process of creating and managing RPC based communication between multiple threads and processes.

2. common:

   • This directory holds shared implementations of both the Service Provider and Service Consumer components. These shared components are reused across different sub-projects, allowing developers to build multithreaded or multiprocessing applications by modifying the Application Model definition.

3. 00_onethread:

   • This example shows how the service provider and client can run in a single thread within the same process. Both components use the same thread, and their code is found in the common directory. The decision to organize them this way is made in the Application Model object.

4. 00_twothreads:

   • In this scenario, the service provider and client run in two separate threads within the same process. The shared implementations are again located in the common directory. The decision to organize them this way is made in the Application Model object.

5. 00_pubservice and 00_pubclient:

   • These projects set up a Public Service, allowing the Service Consumer in the 00_pubclient project to send requests to the Service Provider in the 00_pubservice project. The service provider and consumer components are implemented in the common directory. This example shows how to define a multiprocess application using the Application Model object.

Key Features

• Single-threaded and Multithreaded Examples: Learn how to structure applications where the service provider and client either share the same thread or operate in separate threads within the same process.
• Multiprocessing with IPC: Discover how to set up a service that communicates with multiple clients across different processes.
• Reusable Components: The common directory demonstrates how to centralize service and client implementations for use across various deployment strategies.
• Object Remote Procedure Call (Object RPC): This project demonstrates how Object RPC facilitates communication between different threads and processes, enabling seamless request and response exchanges between components running in the same or multiple processes.
• Code generation: A highly effective way to use the Service Interface document and code generator to reduce errors, avoid tedious tasks, and focus more on the core business logic of the application.

Use Cases

• Multithreading in IPC Applications: Ideal for developers looking to implement services that communicate efficiently across threads and processes.
• Service-Oriented Architectures: Useful for building applications that follow a service-consumer model, allowing for scalable and modular design.
• Event-driven Architectures: Ideal for building applications with asynchronous communication, enabling the design of scalable and autonomous systems.
• Cross-Platform Development: The AREG SDK is designed for cross-platform applications, and this example provides a foundation for creating services that work on different operating systems.