The loading container for extension points, capable of loading extension points from different containers.
org.apache.dubbo.common.extension.ExtensionFactory
org.apache.dubbo.common.extension.factory.SpiExtensionFactory
org.apache.dubbo.config.spring.extension.SpringExtensionFactory
Maven project structure:
XxxExtensionFactory.java:
META-INF/dubbo/org.apache.dubbo.common.extension.ExtensionFactory: