Introduction to CompletableFuture in Java 8

[@Bairagi_Biker]

I haven't seen any other tutorial that has described this with such simplicity and beauty!! Really great work man!

[@prashantjha439]

Trust me this channel is best for industry people.....the sad part is we do not get to see any more videos from this channel.......i would request the creator to at-least think for a membership based subscription

[@sekharsamanta6266]

The most practical video I've ever seen on CompletableFuture

[@mostinho7]

DONE thanks 1:17 callable is used when you want to return a value from a thread (normal thread doesn’t return anything) Implementing call method that returns ReturnType Callable returns a Future that is a placeholder for the real value. Doing future.get() is blocking if the task is not completed 2:50 visualization We can chain methods together (instead of blocking with get() we say thenApply(...) and chain calls asynchronously See chaining from 5:59 12:50 can perform the chained asynchronous operations on the same thread or provide a different thread pool (executor service) for each operation (some operations might be cpu intensive some io, so we want to use different threadpool) 17:00 we don’t have to specify an executor to completable future, it uses forkjoinpool internally Todo continue from 1:17

[@Javavidz]

I have read lot of books and watched so many videos on multi threading, no one explained in this manner. Great work. Thanks for the content.

[@balakrishnajangita6638]

I don't have words to describe you boss awsome bro

[@heshamosman9752]

Whenever I want to remember something about java concurrency, I go and watch your videos, Great job

[@solorankerone]

came back it to again after few years. still blows my mind how simply OP has explained the concepts.

[@kunalrai7577]

Your explanations are truly amazing and crystal clear, hats off and thanks a lot for such a great content.

[@dhaanaanjaay]

why this channel stopped. This is the best source for concurrency topics.

[@asashish905]

Whenever I think of concurrency, I know which YT channel to look up. 🙂❤

[@ndk8111]

Thank you for the session. A few questions please: ONE - what if instead of creating a loop of 1:100 (i) you fetched 100 product ids, how would you revise your code to process 100 orders in parallel? TWO : what if you needed a receipt at the end of each order processing (success or failure) , how would you aggregate results of each thread without blocking and print the final 100 line status receipt from main thread?

[@AbhijeetMuneshwar]

This is 1 video which explained me Future vs Callable Future clearly out of many other videos

[@MukeshShah-lj4th]

Sir your explaination is awesome. I haven't see this type of deep explaination from other tutorials

[@pankajgupta4740]

Terse, succinct, precise, informative, amazing, clear, .... running out of words to describe. Thank you so much for the video series

[@drakezen]

Would be great if you had a series on reactive programming. Good complement to your discussion on completablefutures

[@TheHarpanOnly]

I do agree. You have very good approach in teaching other.

[@surajsingh-vu5oc]

Please make video on reactive programming

[@sushmithashenoy7581]

Beautifully explained. You make everything very simple yet covering all thats relevant to the context. Please keep up the good work that benefits millions like us.

[@krishandeo4070]

Hello sir, I am big fan of your teaching skill. You explain tough topics in very easy way. I request you to please make some tutorials on RxJava. Thank you so much for all your effort.

[@AbhijeetMuneshwar]

This video has shown me true power of CompletableFuture

[@danielgyrtes6370]

Watch it twice guys, after second time everything is clear. Thanks for the video!

[@davesachin1048]

Thanks.. you really made this complex thing easy!!!

[@vishall3379]

Hi Deepak, Your doing a excellent job of covering the most complex topic of Java threads & concurrency on your channel by providing detailed insight & explanation on each feature in simple and clear manner with hands on code. Keep it up.👍

[@gersonadr2]

Finally I understood! Thank you!!

[@muna6403]

I tried to write some good comment for your video session but I can't have word to write.... you are simply very very amazing Sir.... clear all doubt..... never seen this please keep on posting video session.....we are excited to see your new upcoming video session....

[@aryansharma6725]

Such great understanding, I have become a fan. How did you learnt about all these ,you prefer documentation or books or videos? Knowing the answer to this will help me hit the foundational part missing in my learning. Great video though.

[@manishmanghwani731]

The way you explain complex things in simple flow with sharp voice makes it impossible to take break from learning :) Great work Sir!

[@ismile47]

Hi Sir, Your videos are more informative and upto the point. I am not sure why now days there no new videos or topic not getting upload. Please continue with atleast 6months 1 topic

[@shivaliraina3038]

i can't think of a better explanation than this . Amazingly explained. thank you

[@ramt179]

Crystal clear. You are really have the knack of teaching

[@nileshdasarwad1668]

By watching this I have become a big fan of your tutorial thanks lot ..

[@shwetapriyadarshani197]

Too concise and crisp 👍

[@PujaSingh-qg5ln]

Very nicely explained. Finally got clear on the concept of CompletableFuture. Thanks for this video.

[@DurgaShiva7574]

salute you from heart.. no words i have !

[@karankanojiya7672]

Teaching is an art and you have mastered it . Respect ++ Sir !

[@bandisruthi6877]

Really nice 👌.. I have never seen this type of videos related to concurrent package...Awesome explanation with simple examples ...tq so much....

[@vijaykumarreddyt3287]

You are doing Great service, Dude

[@anandashekhar9908]

Do you have any video tutorial about reactive framework in Java please (Extension RX Java)? If yes please kindly share the link.

[@RaviBoyina]

super precise and super cool..thanks to you sir.

[@hareeshjp]

Really really superb explanation of complex topic to understand easy.

[@woshinidayeeee]

The thread pool and tasks graph is really nice.

[@spidy2700]

If only everything was explained with an example like you did, we would never not understand anything.

[@HighlifeC]

I am interested to smash the like button..in a for loop 100 times in async mode :)

[@xzygis]

Thank you! Great and informative video! I don't understand why majority of tutorials(youtube, udemy) doesn't use diagrams or pictures when explaining it's much easier to understand and gives better understanding of all flow. But instead majority just types code and mumbles what that code does and for beginner it's hard to grasp.

[@pinxtr]

This is the second video I watched from your channel and you straight away became one of the best Java youtube channels I'll follow and recommend others to follow as well. Thanks a lot for this super easy explanation!

[@DefogTech]

Thank you for the kind words Priyank!

[@KundanRoy]

You are awesome man.. i just can't explain how much you helping people to understand deep concepts in easy way. I request you to make series of RxJava ..

[@hyperborean72]

Hello, thank you for the great tutorial. Did I understand right that in your example of single order processing the tasks submitted to ExecutorService are blocking to each other though each one is performed in a separate thread? if I'm correct I was wondering why did you use ExecutorService for single order processing if single order processing is sequential by its nature. And the problem is how to fire several separate order processings - not to separate different steps of the same order processing?

[@GirishBapatpune]

Amazing work! Thanks a lot for such a wonderful video. I went through 4, 5 videos from your channel. You have excellent command over teaching in all aspects: mentioning problem statement, explaining with diagram, providing solution and need of each line why it's been used with available relevant alternatives, pros and cons. On top of this your speed and tone is perfect for learner. Superb audio, video, presentation quality as well. Thanks a ton! God bless you.

[@Namrata766]

Really simple and informative. Thanks for this video. I got to know all that I needed to know about CompletableFuture from here.

[@alpavaidya412]

I could listen to your explanations all day...u make it so easy to understand...u deserve many more subscribers

[@DefogTech]

Thank you so much for the kind words!

[@tristanmoller9498]

Best explanation I have encountered, thanks so much!

[@mayankpant5471]

who is this guy ? I have seen very few people in internet explain java topics with such simplicity and cohesion

[@lings628]

Fantastic job man! God bless you. Please do a video on RxJava. Nobody will be able to explain it like you do.

[@manomitmitra6903]

Beautiful. "Possibly Asynchronous", I have never heard anyone said that. 👍

[@virendrakhade12]

Very nice explanation, thanks a lot

[@DefogTech]

You're welcome!

[@sivaramakrishnakv]

Very composed and clear explanation with practical examples. Great work!!

[@pbgkhy]

Superb explanation

[@Chronosulph]

@15:07 creating a threadpool for every task seems like a overkill . Can we not create threadpool outside of loop it might reduce overhead of 100 threadpools

[@praveensisodia8055]

Absolutely brilliant !! I have seen many videos on completableFuture , but this was the best one. what clarity man. Brilliant !!

[@jsaimanohar]

Really great work man!

[@AshishRohillax]

Brilliant explanation mate.❤

[@RahulKumar-j9y6p]

liked the detailing

[@ntonZZ]

Dude, where were you all this time? videos are precise, exact and crisp.

[@rajeshg3570]

Beautiful explanation on this concept. I've a question here - Do we have any specific advantage if we use two thread pools instead of one? I mean to ask what are the practical scenarios to use more than one thread pool ?

[@cseshivaprasad1985]

Wonderful explanation with right example. I was always struggling to apply this pattern for my processes, this gives lot of clarity. Is it a simplified version of Saga pattern ?

[@vinaypandey5599]

You are awesome! Please keep posting videos don't stop. No one explained threads the way you do..

[@MakeItStik]

Another beautiful and clearly explained video :) Haven't seen any new videos from you :( Please continue making such videos, it really helps.

[@omerchannel]

simple, easy, to the point, really excellent

[@rohannayak4979]

Awesome explanation Sir. Why are there 20+ down votes....?

[@murrayKorir]

Very very awesome. I now fully understand.

[@dhruvgupta1993]

You have really explained it in a proper manner and very easy way. Thank you!!

[@asankasiriwardena3383]

Wow superb explanation ..!

[@vivekpurushothaman8]

Brilliant video. A lot of my confusions got resolved through this video. I will subscribe to you because I find learning with you very enriching. Please keep creating more videos like this :) Also for completablefuture if you can include collecting multiple futures through .get .all etc... It'll be complete

[@curriedagain]

Very nice!

[@SreeAn]

You deserve more subscribers and views. Very clear and crisp and to the point.

[@pramodkumar-fo5sy]

such a amazing teacher, hats off dear!!!

[@gargsuraj12]

Have to say, very well explained. Keep creating the good work.💪

[@karanvatwani9077]

Very well explained. One doubt i have, suppose if we have one executor service and we have Future.submit(task) which is performing some DB fetch or list operation and when we do future.get() with timeout overloaded method so it is blocking the thread and giving Timeout Exception. We are passing 120 sec time out limit in get() method. So how does CompletebaleFuture.suuplyAsync() and CompletableFuture.complete() will help us here?

[@sathishrajasekar1155]

Good Explanation on Completable Future

[@SunnyKumar-ud9gp]

Please please continue video making😭😭..it's a GOLD

[@gkcs]

10:47 I got unsettled watching those lambdas not being converted to method references :P Thanks for the great video Deepak!

[@B-Billy]

@Gourav are you a java developer? :)

[@upeshsai2804]

Wow it's soo good to see you here Gaurav ! It's like when both of my gurus meet :D

[@marlonemoreira3460]

Ra

[@ms_thesingh7894]

By voice it looks like Gaurav and Deepak are same :-)

[@chetanmishra7009]

@@ms_thesingh7894 gangadhar(#guru_ji) hi shaktimaan hai

[@mahmoudezzeldin3265]

great video. i am seeing this in December 2019, go a head. u have agreat future in education because u r an awesome teacher. u explain stuff like a pro

[@biswaranjan84]

Best Explanation ever which i find. Just one question in my mind - Can the same functionality be achieved by CompletionService as well ?

[@PA-vf5st]

Very well explained, You have long way to go....Subscribed already n waiting for other video’s....Thank You...

[@raghavprasad277]

Thank you so much for the explanation. Very well explained.

[@no_more_free_nicks]

Thanks this is a good explanation, I will do some exercises tomorrow.

[@giriNITT]

Thank you for helping me to understand the future concepts and tidy up. I especially like the way you lined the problems with blocking calls and then completable futures. That will make a really big difference when i will use it.

[@rohitkumar-pr9ox]

Thanks for explaining in such a great way

[@kayeshparvez]

Great video. Thanks for explaining nicely

[@MegaSriku]

A great video that I came across to understand CompletableFuture. Keep it up man.

[@unsaturated8482]

excellent.

[@HarishKumar-yh3tz]

Nice explanation. Very clear and the recording was also crisp

[@pranabkumarsahoo2490]

Very very clear explained......thanks a lot

[@jamesteh2847]

Great, clear explanation. Thank you!

[@divyamahesh9032]

Awesome video with the perfect usecase

[@mjsprasad9396]

It's great. Question: 1) Can we execute a threads like a Cron Job? Ex: Suppose execute the 5 thread from main method for specific time and period.

[@Luk3Stein]

Check out ScheduledExecutorService

[@pdteach]

Thank you for such a informative video

[@suhassuvvi5777]

Great explaination. Also could you please explain how completable future works internally

[@adriancontreras7691]

great job man, best explanation ever! thanks you so much!

[@NitishRajSrivastava]

Brilliant explanation of the concept. Thanks !!

[@amitsinha3944]

Beautifully explained. Have one confusion though. Would request you to clear that. I tried below piece of code to get complete understanding. What i was expecting is all threads to complete except the one for which i purposefully slept thread for 5 seconds. for(int i=0;i"").thenAccept((o)->{ if(val==5){ try(){ Thread.sleep(5000); }catch(InterruptedException e){ } } System.out.println(o+"-printed-"+val) }) } However, i saw o/p like this which caused the confusion amit-printed-0 amit-printed-1 amit-printed-2 amit-printed-3 amit-printed-4 waited for 5 seconds and then printed.. amit-printed-5 amit-printed-6 amit-printed-7 amit-printed-8 amit-printed-9 I thought no thread will be blocked if any one cause delay. In order to fix that i had to provide a seperate threadpool like below ExecutorService executorService =Executors.newCachedThreadPool(); CompletableFuture.supplyAsync(()->"",executorService).thenAccept((o)->{... Can you please clear this confusion.