5- Asynchronous Programming

Jul 03, 2026 23:01 · 1:50 · English · Whisper Turbo · 2 Wasemaji

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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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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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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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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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but if you had a mobile or a desktop app,

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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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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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we should write code in a non -blocking way and that is what we call asynchronous

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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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that resource is like a thread in our application.

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We don't want to make our main thread or another thread wait for the

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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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Java gave us a new tool for implementing this kind of applications,

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asynchronous applications.

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S… Speaker 1 (5- Asynchronous Programming)

We're going to look at that next.

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