15- Waiting for the First Task

Jul 04, 2026 01:19 · 2:13 · English · Whisper Turbo · 2 Enregistraments

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Lectura

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Let's say there are two ways to get the current weather in a given city.

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Perhaps we have two different remote services,

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but sometimes one of these services responds a little bit slower.

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So we want to call these services concurrently and as soon as we get a response,

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we're going to display it to the user.

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Let me show you how to do that.

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So I'm going to create two completable futures.

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Here's the first one completable future that supply async.

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Let's say this is our slow link.

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in the body of this lambda,

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I'm going to call long task that simulate and

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then return 20.

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That is the current weather,

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let's say in New York City.

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Now we create a second task completable

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future that supply async.

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Now this simulates a fast link.

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So here we return 20 immediately.

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Now we're going to call both these services concurrently.

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And as soon as one of them respond,

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we're going to print the result on the terminal.

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Here we call completable future dot in the last

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video you learned about all of with this we can wait for the completion of all tasks.

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We have another method called any of this returns

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a new completable future that will complete as soon as one of these

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completable futures that we pass here completes.

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So just like before we have var arcs here we

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can pass any number of completable futures.

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I'm going to pass first and second.

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This will give us a new completable future.

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Let's store it in this variable fastest.

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Look at the type of this variable.

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It's a completable future of object.

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Now,

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right after we get the result,

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we can call then accept.

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We're going to consume the result.

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So we get the temperature and print it on a terminal.

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Now,

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let's reformat our code.

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That is better.

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So,

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run.

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See, we got the result immediately.

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We didn't have to wait three seconds to get the current weather from our slow service.

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