5- Asynchronous Programming

Jul 03, 2026 23:01 · 1:50 · English · Whisper Turbo · 2 Talare
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S… Speaker 1 (5- Asynchronous Programming)
In the last video, I told you that this get method
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S… Speaker 1 (5- Asynchronous Programming)
is a blocking method.
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S… Speaker 1 (5- Asynchronous Programming)
When we call it,
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S… Speaker 1 (5- Asynchronous Programming)
the current thread has to wait until the result of this task is
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ready. So even though we're executing this task in a separate thread,
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S… Speaker 1 (5- Asynchronous Programming)
we're making the current thread wait for the completion of that thread.
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S… Speaker 1 (5- Asynchronous Programming)
We're not using our threads properly,
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S… Speaker 1 (5- Asynchronous Programming)
we're wasting our threads.
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S… Speaker 1 (5- Asynchronous Programming)
Now this is a very simple application,
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S… Speaker 1 (5- Asynchronous Programming)
this is a command line application,
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S… Speaker 1 (5- Asynchronous Programming)
but if you had a mobile or a desktop app,
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S… Speaker 1 (5- Asynchronous Programming)
this main thread would be responsible for handling the UI events,
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S… Speaker 1 (5- Asynchronous Programming)
such as mouse clicks and keystrokes.
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S… Speaker 1 (5- Asynchronous Programming)
So if you make the main thread wait for the completion of another thread,
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S… Speaker 1 (5- Asynchronous Programming)
it's not going to be able to respond to the UI events.
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S… Speaker 1 (5- Asynchronous Programming)
The application window is going to freeze and the user is not going to be able to resize
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S… Speaker 1 (5- Asynchronous Programming)
or move it.
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S… Speaker 1 (5- Asynchronous Programming)
So to get the most out of our threads,
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S… Speaker 1 (5- Asynchronous Programming)
we should write code in a non -blocking way and that is what we call asynchronous
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S… Speaker 1 (5- Asynchronous Programming)
programming.
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S… Speaker 1 (5- Asynchronous Programming)
Asynchronous is one of those fancy computer science terms,
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S… Speaker 1 (5- Asynchronous Programming)
but basically it means non -blocking.
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S… Speaker 1 (5- Asynchronous Programming)
This code that we have here is synchronous code.
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S… Speaker 1 (5- Asynchronous Programming)
It's blocking.
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S… Speaker 1 (5- Asynchronous Programming)
We want to write code in a non -blocking way.
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S… Speaker 1 (5- Asynchronous Programming)
As a metaphor,
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S… Speaker 1 (5- Asynchronous Programming)
think of a restaurant.
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S… Speaker 1 (5- Asynchronous Programming)
When you go in a restaurant and order your food,
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S… Speaker 1 (5- Asynchronous Programming)
the waiter comes,
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S… Speaker 1 (5- Asynchronous Programming)
takes your order,
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S… Speaker 1 (5- Asynchronous Programming)
and passes it to the kitchen.
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S… Speaker 2 (5- Asynchronous Programming)
Now,
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S… Speaker 1 (5- Asynchronous Programming)
he doesn't have to sit there,
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S… Speaker 1 (5- Asynchronous Programming)
wait for the kitchen to prepare your food before serving another guest.
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S… Speaker 1 (5- Asynchronous Programming)
He can go serve someone else in the meantime.
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S… Speaker 1 (5- Asynchronous Programming)
So that waiter,
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S… Speaker 1 (5- Asynchronous Programming)
that resource is like a thread in our application.
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S… Speaker 1 (5- Asynchronous Programming)
We don't want to make our main thread or another thread wait for the
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S… Speaker 1 (5- Asynchronous Programming)
completion of another thread as much as possible.
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S… Speaker 1 (5- Asynchronous Programming)
So we want to orchestrate our tasks such that when a task completes,
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S… Speaker 1 (5- Asynchronous Programming)
another task can get executed asynchronously.
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S… Speaker 1 (5- Asynchronous Programming)
In 2014,
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S… Speaker 1 (5- Asynchronous Programming)
Java gave us a new tool for implementing this kind of applications,
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S… Speaker 1 (5- Asynchronous Programming)
asynchronous applications.
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S… Speaker 1 (5- Asynchronous Programming)
We're going to look at that next.

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