9- Strategies for Thread Safety

Jul 03, 2026 15:08 · 2:50 · English · Whisper Turbo · 3 Hökmdar

Bu transkriptin müddəti bu gün bitəcək. Daimi saxlama üçün yüksəlt →

_Oxu

0:03

S… Speaker 2 (9- Strategies for Thread Safety)

We have a few strategies for writing thread safe code.

0:06

S… Speaker 2 (9- Strategies for Thread Safety)

That is code that can be safely executed across multiple threads.

0:10

S… Speaker 2 (9- Strategies for Thread Safety)

The simplest solution is not to share data across threads in the first

0:14

S… Speaker 2 (9- Strategies for Thread Safety)

place. This is called confinement because we want to confine or restrict

0:18

S… Speaker 2 (9- Strategies for Thread Safety)

each thread to have its own data.

0:20

S… Speaker 1 (9- Strategies for Thread Safety)

For example,

0:22

S… Speaker 2 (9- Strategies for Thread Safety)

instead of sharing a download status object across many download tasks,

0:26

S… Speaker 2 (9- Strategies for Thread Safety)

you could have each download task have its own download status object.

0:30

S… Speaker 2 (9- Strategies for Thread Safety)

When all these tasks are complete,

0:31

S… Speaker 2 (9- Strategies for Thread Safety)

we can combine the result.

0:33

S… Speaker 2 (9- Strategies for Thread Safety)

So this is the simplest strategy.

0:35

S… Speaker 2 (9- Strategies for Thread Safety)

I will show you how to do this in the next video.

0:37

S… Speaker 2 (9- Strategies for Thread Safety)

Another strategy is using immutable or unchangeable

0:41

S… Speaker 2 (9- Strategies for Thread Safety)

objects.

0:42

S… Speaker 2 (9- Strategies for Thread Safety)

An object is immutable if its state or data cannot be

0:46

S… Speaker 2 (9- Strategies for Thread Safety)

changed after it's created.

0:48

S… Speaker 1 (9- Strategies for Thread Safety)

For example,

0:49

S… Speaker 2 (9- Strategies for Thread Safety)

the string class in Java is immutable.

0:51

S… Speaker 2 (9- Strategies for Thread Safety)

If we convert a string to uppercase,

0:53

S… Speaker 2 (9- Strategies for Thread Safety)

we get a new string object.

0:55

S… Speaker 2 (9- Strategies for Thread Safety)

The original string object is not changed.

0:58

S… Speaker 1 (9- Strategies for Thread Safety)

So,

0:58

S… Speaker 2 (9- Strategies for Thread Safety)

sharing immutable objects between threads is totally fine because these

1:02

S… Speaker 2 (9- Strategies for Thread Safety)

threads can only read immutable objects.

1:05

S… Speaker 2 (9- Strategies for Thread Safety)

They cannot modify them.

1:06

S… Speaker 2 (9- Strategies for Thread Safety)

Another strategy is to prevent multiple threads from accessing

1:10

S… Speaker 2 (9- Strategies for Thread Safety)

the same object concurrently.

1:12

S… Speaker 2 (9- Strategies for Thread Safety)

This is called synchronization because we synchronize or coordinate the access

1:16

S… Speaker 2 (9- Strategies for Thread Safety)

to an object across different threads.

1:18

S… Speaker 2 (9- Strategies for Thread Safety)

We do that by using locks.

1:20

S… Speaker 2 (9- Strategies for Thread Safety)

So we put a lock on certain parts of our code and only one

1:24

S… Speaker 2 (9- Strategies for Thread Safety)

thread at a time can execute that part.

1:26

S… Speaker 2 (9- Strategies for Thread Safety)

Other threads have to wait.

1:28

S… Speaker 2 (9- Strategies for Thread Safety)

So synchronization forces the code to run sequentially,

1:31

S… Speaker 2 (9- Strategies for Thread Safety)

which is against the idea of concurrency.

1:33

S… Speaker 1 (9- Strategies for Thread Safety)

Plus,

1:34

S… Speaker 2 (9- Strategies for Thread Safety)

implementing synchronization is challenging and error prone.

1:38

S… Speaker 2 (9- Strategies for Thread Safety)

One of the problems we may run into is a deadlock which happens when two threads

1:42

S… Speaker 2 (9- Strategies for Thread Safety)

wait for each other indefinitely.

1:44

S… Speaker 2 (9- Strategies for Thread Safety)

So thread one waits for thread two and at the same time thread

1:48

S… Speaker 2 (9- Strategies for Thread Safety)

two waits for thread one.

1:49

S… Speaker 2 (9- Strategies for Thread Safety)

That's a deadlock and can cause our application to crash.

1:53

S… Speaker 2 (9- Strategies for Thread Safety)

So generally speaking synchronization is bad and you should avoid it

1:57

S… Speaker 2 (9- Strategies for Thread Safety)

as much as possible.

1:58

S… Speaker 2 (9- Strategies for Thread Safety)

Another strategy is to use atomic classes in Java like atomic integer.

2:02

S… Speaker 2 (9- Strategies for Thread Safety)

These classes allow us to achieve threat safety without using locks.

2:06

S… Speaker 2 (9- Strategies for Thread Safety)

So if we increment an atomic integer,

2:08

S… Speaker 2 (9- Strategies for Thread Safety)

the Java virtual machine will execute the increment operation as one

2:12

S… Speaker 2 (9- Strategies for Thread Safety)

single atomic operation.

2:14

S… Speaker 2 (9- Strategies for Thread Safety)

It's not going to break it down into three smaller operations.

2:17

S… Speaker 2 (9- Strategies for Thread Safety)

That's why they're called atomic.

2:19

S… Speaker 2 (9- Strategies for Thread Safety)

They're like atoms.

2:20

S… Speaker 2 (9- Strategies for Thread Safety)

They cannot be broken down.

2:22

S… Speaker 3 (9- Strategies for Thread Safety)

And finally,

2:23

S… Speaker 2 (9- Strategies for Thread Safety)

another strategy is partitioning data into segments that can be accessed

2:27

S… Speaker 2 (9- Strategies for Thread Safety)

concurrently.

2:28

S… Speaker 2 (9- Strategies for Thread Safety)

Java provides a number of collection classes that support concurrency using

2:32

S… Speaker 2 (9- Strategies for Thread Safety)

partitioning.

2:33

S… Speaker 2 (9- Strategies for Thread Safety)

So multiple threads can access a collection object,

2:35

S… Speaker 2 (9- Strategies for Thread Safety)

but only one thread at a time can access a segment in that collection.

2:40

S… Speaker 2 (9- Strategies for Thread Safety)

So these are five common strategies we have for writing thread safe code.

2:44

S… Speaker 2 (9- Strategies for Thread Safety)

Over the next few lessons,

2:45

S… Speaker 2 (9- Strategies for Thread Safety)

we're going to explore each of these strategies.

Bu transkript AI (avtomatik səs tanıması) tərəfindən yaradılmışdır. Xətalar ola bilər - kritik istifadə üçün orijinal səslə müqayisə edin. AI siyasəti

❤️ Sevgi STT.ai? Dostlarınıza deyin!

İcmal

Bu transkriptin AI qısa mə'lumatını yaratmaq üçün Summarize düyməsini basın.

Bu transkript haqqında AI-dən soruş

Bu transkript haqqında hər şeyi soruşun — AI uyğun hissələri tapacaq və cavab verəcək.

Başqasını Yaz