overhead-minimization | 易学教程

How do I provide a default implementation for an Objective-C protocol?

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问题 I'd like to specify an Objective-C protocol with an optional routine. When the routine is not implemented by a class conforming to the protocol I'd like to use a default implementation in its place. Is there a place in the protocol itself where I can define this default implementation? If not, what is the best practice to reduce copying and pasting this default implementation all over the place? 回答1: Objective-C protocols have no affordance for default implementations. They are purely

HTTP vs Websockets with respect to overhead

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问题 I am building a file synchronization program (not unlike Dropbox) using node.js on both ends. I need to have potentially thousands of clients requesting data at the same time. Here is my current system: Server pushes notifications to client over a websocket (file has been updated) Client queues downloads and makes an HTTP request when idle I will be serving data in compressed chunks of, say, 50 MB each, so the HTTP request overhead (headers) is negligible. If I were to use websockets for

HTTP vs Websockets with respect to overhead

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I am building a file synchronization program (not unlike Dropbox) using node.js on both ends. I need to have potentially thousands of clients requesting data at the same time. Here is my current system: Server pushes notifications to client over a websocket (file has been updated) Client queues downloads and makes an HTTP request when idle I will be serving data in compressed chunks of, say, 50 MB each, so the HTTP request overhead (headers) is negligible. If I were to use websockets for requests and push notifications, would there be: Noticeable overall speed improvements? (reduced latency,