cnd / CppMicroServices

An OSGi-like C++ dynamic module system and service registry

C++ Micro Services

Introduction

The C++ Micro Services library provides a dynamic service registry and module system, partially based the OSGi Core Release 5 specifications. It enables developers to create a service oriented and dynamic software stack.

Proper usage of the C++ Micro Services library leads to

• Re-use of software components
• Loose coupling
• Separation of concerns
• Clean APIs based on service interfaces
• Extensible systems

and more.

Requirements

This is a pure C++ implementation of the OSGi service model and does not have any third-party library dependencies.

Supported Platforms

The library should compile on many different platforms. Below is a list of tested compiler/OS combinations:

• GCC 4.6 (Ubuntu 12.04)
• GCC 4.8 (Ubuntu 13.10)
• Clang 3.2 (Ubuntu 13.10)
• Clang (MacOS X 10.8 and 10.9)
• Visual Studio 2008 SP1, 2010, 2012, 2013 (Windows 7)

Legal

Copyright (c) German Cancer Research Center. Licensed under the Apache License v2.0.

Quick Start

Essentially, the C++ Micro Services library provides you with a powerful dynamic service registry. Each shared or static library has an associated ModuleContext object, through which the service registry is accessed.

To query the registry for a service object implementing one or more specific interfaces, the code would look like this:

#include <usModuleContext.h>
#include <someInterface.h>

using namespace us;

void UseService(ModuleContext* context)
{
  ServiceReference serviceRef = context->GetServiceReference<SomeInterface>();
  if (serviceRef)
  {
    SomeInterface* service = context->GetService<SomeInterface>(serviceRef);
    if (service) { /* do something */ }
  }
}

Registering a service object against a certain interface looks like this:

#include <usModuleContext.h>
#include <someInterface.h>

using namespace us;

void RegisterSomeService(ModuleContext* context, SomeInterface* service)
{
  context->RegisterService<SomeInterface>(service);
}

The OSGi service model additionally allows to annotate services with properties and using these properties during service look-ups. It also allows to track the life-cycle of service objects. Please see the Documentation for more examples and tutorials and the API reference. There is also a blog post about OSGi Lite for C++.

Build Instructions

Please visit the Build Instructions page online.