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A question unrelated to your programming concepts: If you only query your source when a request comes in, doesn't the first requester get old data? This is a problem I have faced before.

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Couldn't you make the first requester wait until you've made your query?

Sure. But I assumed one goal was to offer low-latency access to a high-latency service. I.E. Act as a cache.

Oh. That would be a tough spot to be in. I assumed that's not an issue here though.

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