Private field service: ThirdPartyYouTubeLibĬonstructor CachedYouTubeClass(service: ThirdPartyYouTubeLib) is It delegates to the service object only whenĬlass CachedYouTubeClass implements ThirdPartyYouTubeLib is proxy class which implements the same interface as the That's why we put the caching code into a new been provided as part of a third party library and/or defined But it may be impossible to put such code To save some bandwidth, we can cache request results and keep requests are fired at the same time, even if they all requestĬlass ThirdPartyYouTubeClass implements ThirdPartyYouTubeLib is The application will slow down if a lot of of the request depends on a user's internet connection as of this class can request information from YouTube. The concrete implementation of a service connector. However, it keeps track of the downloaded files and returns the cached result when the app requests the same video multiple times. The proxy class implements the same interface as the original downloader and delegates it all the work. If the client application requests the same video multiple times, the library just downloads it over and over, instead of caching and reusing the first downloaded file. The library provides us with the video downloading class. This example illustrates how the Proxy pattern can help to introduce lazy initialization and caching to a 3rd-party YouTube integration library.Ĭaching results of a service with a proxy.
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