The right approach to work with Optional Plugin Dependencies

Hello,

I want to use optional plugin dependencies in the plugin. So far it's done like this

In plugin.xml

<depends optional="true" config-file="my-plugin-maven.xml">org.jetbrains.idea.maven</depends>

In my-plugin-maven.xml 

<idea-plugin>
  <extensions defaultExtensionNs="com.intellij">
    <projectService serviceImplementation="com.services.MavenService"/>
  </extensions>
</idea-plugin>

In my code something like

class MyPluginStartupActivity : StartupActivity {

   override fun runActivity(project: Project) {
      val service: MavenService? = project.service()
      service?.execute()
   }
}

Is this the correct approach or is it better somehow differently?

Thank you!

Best regards,

Alex