6- Completable Futures

Jul 03, 2026 23:03 · 1:38 · English · Whisper Turbo · 2 స్పీకర్లు
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S… Speaker 1 (6- Completable Futures)
Throughout the rest of this section,
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S… Speaker 1 (6- Completable Futures)
we're going to talk about a very important type called completable future.
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S… Speaker 1 (6- Completable Futures)
As you can see this class implements the future interface.
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S… Speaker 1 (6- Completable Futures)
So every completable future is a future object.
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S… Speaker 1 (6- Completable Futures)
Now the reason this is called completable future is that with this we can
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explicitly complete a future object.
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S… Speaker 1 (6- Completable Futures)
This is not something that we can do with the future interface.
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S… Speaker 1 (6- Completable Futures)
Now, this class also implements another interface called completion stage.
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S… Speaker 1 (6- Completable Futures)
If you look at the documentation,
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S… Speaker 1 (6- Completable Futures)
it says that this interface represents a stage of a
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possibly asynchronous operation.
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S… Speaker 2 (6- Completable Futures)
What does this mean?
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S… Speaker 2 (6- Completable Futures)
Well,
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S… Speaker 1 (6- Completable Futures)
in the real world,
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S… Speaker 1 (6- Completable Futures)
quite often an asynchronous operation involves many steps.
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S… Speaker 1 (6- Completable Futures)
For example,
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S… Speaker 1 (6- Completable Futures)
we may call a remote API to get some data.
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S… Speaker 1 (6- Completable Futures)
That is one step.
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S… Speaker 1 (6- Completable Futures)
Then perhaps we want to transform that data into a different structure.
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S… Speaker 1 (6- Completable Futures)
That's another step.
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S… Speaker 1 (6- Completable Futures)
And finally,
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S… Speaker 1 (6- Completable Futures)
we want to write that data into a database.
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S… Speaker 1 (6- Completable Futures)
That's another step.
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S… Speaker 1 (6- Completable Futures)
This interface represents a step or a stage of an asynchronous operation.
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S… Speaker 1 (6- Completable Futures)
And it gives us a bunch of methods for combining and composing
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S… Speaker 1 (6- Completable Futures)
these steps in a declarative way,
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S… Speaker 1 (6- Completable Futures)
kind of like how we use the streams API to build a complex query in
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S… Speaker 2 (6- Completable Futures)
a declarative way.
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S… Speaker 2 (6- Completable Futures)
Earlier,
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S… Speaker 1 (6- Completable Futures)
we use the map filter and reduce methods to build a complex query.
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S… Speaker 1 (6- Completable Futures)
Now we can do the same thing with this completion stage interface.
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S… Speaker 1 (6- Completable Futures)
I'm going to show you how to do that later in this section.
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S… Speaker 1 (6- Completable Futures)
So over the next few videos,
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S… Speaker 1 (6- Completable Futures)
we're going to talk about the completable feature class.
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S… Speaker 1 (6- Completable Futures)
I'm going to show you how to use this class to build complex asynchronous
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S… Speaker 1 (6- Completable Futures)
operations.
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S… Speaker 1 (6- Completable Futures)
But first,
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S… Speaker 1 (6- Completable Futures)
let me show you how to create a completable feature object.

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