What is the process for calling Dubbo?

The process of invoking Dubbo can be broken down into the following steps:

1. When a service provider starts up, it registers its service interface, methods, and address information in a registration center such as ZooKeeper.
2. When the service consumer starts, it retrieves a list of service provider addresses from the registry.
3. Consumers initiate remote calls: Consumers initiate remote call requests over the network based on service interface and method information.
4. Load balancing: Dubbo comes with multiple load balancing algorithms built in, selecting the appropriate service provider based on the specific configuration of the algorithm.
5. Network communication: Service consumers transmit remote calls over the network to service providers.
6. The service provider receives a request: After receiving a request, the service provider identifies the corresponding service implementation based on the request’s interface, method, etc., and then calls it.
7. The result of the call is returned: The service provider returns the result of the call to the service consumer.
8. The service consumer receives the outcome and then returns it to the caller after receiving the call result.

Throughout the entire calling process, the Dubbo framework is responsible for handling service registration and discovery, load balancing, network communication, and other underlying details, making service calls simple and transparent. Additionally, Dubbo provides a variety of configuration options for flexible customization and extension of each aspect.