15- Waiting for the First Task

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

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ലാപ്‌സ് ഇന്‍ഡെക്സ്

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S… Speaker 2 (15- Waiting for the First Task)

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

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S… Speaker 2 (15- Waiting for the First Task)

Perhaps we have two different remote services,

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S… Speaker 2 (15- Waiting for the First Task)

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

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S… Speaker 2 (15- Waiting for the First Task)

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

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S… Speaker 2 (15- Waiting for the First Task)

we're going to display it to the user.

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S… Speaker 2 (15- Waiting for the First Task)

Let me show you how to do that.

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S… Speaker 2 (15- Waiting for the First Task)

So I'm going to create two completable futures.

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S… Speaker 2 (15- Waiting for the First Task)

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

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S… Speaker 2 (15- Waiting for the First Task)

Let's say this is our slow link.

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S… Speaker 1 (15- Waiting for the First Task)

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S… Speaker 2 (15- Waiting for the First Task)

in the body of this lambda,

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S… Speaker 2 (15- Waiting for the First Task)

I'm going to call long task that simulate and

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S… Speaker 2 (15- Waiting for the First Task)

then return 20.

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S… Speaker 2 (15- Waiting for the First Task)

That is the current weather,

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S… Speaker 2 (15- Waiting for the First Task)

let's say in New York City.

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S… Speaker 2 (15- Waiting for the First Task)

Now we create a second task completable

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S… Speaker 2 (15- Waiting for the First Task)

future that supply async.

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S… Speaker 2 (15- Waiting for the First Task)

Now this simulates a fast link.

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S… Speaker 2 (15- Waiting for the First Task)

So here we return 20 immediately.

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S… Speaker 2 (15- Waiting for the First Task)

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

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S… Speaker 2 (15- Waiting for the First Task)

And as soon as one of them respond,

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S… Speaker 2 (15- Waiting for the First Task)

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

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S… Speaker 1 (15- Waiting for the First Task)

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S… Speaker 2 (15- Waiting for the First Task)

Here we call completable future dot in the last

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S… Speaker 2 (15- Waiting for the First Task)

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

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S… Speaker 2 (15- Waiting for the First Task)

We have another method called any of this returns

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S… Speaker 2 (15- Waiting for the First Task)

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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S… Speaker 2 (15- Waiting for the First Task)

So just like before we have var arcs here we

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S… Speaker 2 (15- Waiting for the First Task)

can pass any number of completable futures.

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S… Speaker 2 (15- Waiting for the First Task)

I'm going to pass first and second.

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S… Speaker 2 (15- Waiting for the First Task)

This will give us a new completable future.

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S… Speaker 2 (15- Waiting for the First Task)

Let's store it in this variable fastest.

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S… Speaker 2 (15- Waiting for the First Task)

Look at the type of this variable.

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S… Speaker 2 (15- Waiting for the First Task)

It's a completable future of object.

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S… Speaker 1 (15- Waiting for the First Task)

Now,

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S… Speaker 2 (15- Waiting for the First Task)

right after we get the result,

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S… Speaker 2 (15- Waiting for the First Task)

we can call then accept.

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S… Speaker 2 (15- Waiting for the First Task)

We're going to consume the result.

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S… Speaker 2 (15- Waiting for the First Task)

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

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S… Speaker 1 (15- Waiting for the First Task)

Now,

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S… Speaker 2 (15- Waiting for the First Task)

let's reformat our code.

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S… Speaker 2 (15- Waiting for the First Task)

That is better.

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S… Speaker 1 (15- Waiting for the First Task)

So,

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S… Speaker 2 (15- Waiting for the First Task)

run.

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S… Speaker 2 (15- Waiting for the First Task)

See, we got the result immediately.

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S… Speaker 2 (15- Waiting for the First Task)

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

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