Create a command

In the Command-Query Responsibility Segregation (CQRS) pattern, commands represent the operations that change the state of the system. They are typically used to create, update, or delete data within an application. A command is often represented by a message or a request that contains the data needed to execute the operation.

You can create a command by implementing the Command interface.

src/core/commands/CreateUserCommand.java

public class CreateUserCommand implements Command {
    public String username;
}