Hello in proxy pattern diagram under #Pseudocode
CachedYoutubeClass delegates -service: ThirdPartyYoutubeLib shouldn't it be -service: ThirdPartyYoutubeClass as in the pseudocode below it?
Thanks for the bug report, I have fixed both the code and the diagram. The service should be of the ThirdPartyYouTubeLib interface type.
Customer support service by UserEcho