Build your own C/C ++ plug-in development framework (I)-preliminary ideas

Elements of the C/C ++ plug-in development framework
First, solve the following problems:

1. Register a plug-in;

2. How to call the plug-in;

3. How to test the plug-in;

4. lifecycle management of plug-ins;

5. Management and Maintenance of plug-ins;

6. Plug-in assembly;

7. Agent error handling;

8. Broadcast and subscribe to service events (this is not yet considered for support );

Among them, there are several important points: 1) the plug-in framework should be able to make the modules loosely coupled for real interface-oriented programming; 2) the framework should support automated testing, including unit testing and integration testing; 3) Simplified deployment; 4) Support for distributed deployment. modules can call plug-ins outside the framework.

Technologies used
One problem to be solved by the plug-in framework is the dynamic loading capability of the plug-in. The dynamic loading technology of shared libraries can be used here. Of course, for simplicity, the first step is to consider only a plug-in framework under linux.

Overall Structure

For the overall structure of the Framework, refer to the OSGI "microkernel + system plug-in + application plug-in" structure. Here, we should consider what to do in the kernel. With regard to the microkernel structure, I used to create a microkernel process engine and will share it with you later.

There are two solutions for inter-module data transmission in the framework: first, the XML data bus approach adopted by panyuan. The advantage is good scalability and readability. However, the speed is slow. The second is to use cell streams that I am familiar. The advantage is high efficiency, convenient access, but less readable. In addition, the network byte sequence needs to be considered for cross-framework data transmission.

For inter-framework communication, the system plug-in is encapsulated to hide the communication details of the application plug-in.

Deployment

One-click deployment.