What is a SynchronousQueue in Java?

[@riderprovider6213]

If anybody can understand fully the concept shared by all the videos in this Defog Tech channel, I bet he/she will get a package of 20+ LPA. Thank you for putting so many quality Java tutorial videos.

[@shellindebted5328]

Sir, i feel fortunate that i came across this video.I thoroughly enjoyed it. Thanks !

[@smartstack]

Love your explainations! Have been binge watching!

[@rajeevkandpal1880]

Thanks again for explaining complex subjects with lucid simplicity. Please make a video on countdown latch/cyclic barrier and Phaser. thanks

[@virtexamit]

Please do cover difference between LinkedBlockingQueue and ArrayBlockingQueue. Your explanation is very nice. Many thanks for such creative work and appreciated for sharing with all.

[@jaime7295]

The items in one is stored as an array while the other as a linkedlist

[@mr.bikashdeka7117]

@Defog Tech Please explain all the internal implementation of all collection framework

[@odilhonislomov8954]

Thanks a lot

[@theycallme_nightmaster]

Would it be a good idea to use this for collision detection in a game? For example if you only had a render() thread on each object you could use a Queue to block until a collision detection thread picks up the object to be rendered at the perfect time so that the collision detection is happening in the background for the next frame while the current frame gets rendered. Thanks for the video, very helpful!

[@Gett37]

Thank you my friend

[@alex_stevens]

Great explanation

[@stefanjankovic8253]

You mentioned methods put() and take(). What if I use some loop and use offer() and element() for example? Are they thread safe? Is only take and put thread safe here?

[@ShyamSunderReddy-t1s]

superb sir

[@MegaAnufriev]

Nice and clear tutorials! Like your channel.

[@DefogTech]

Thank you!

[@sharanyarai378]

Since you mentioned blocking queue is thread safe then how many producer/consumer thread can work @ same time? What is thread safety means here?

[@DefogTech]

Thread safety means, in presence of multiple threads doing concurrent access, the days integrity of the queue is not compromised. Blocking Queue will ensure* only one thread gets the value and only one thread is able to put value at a time.. etc.

[@vijaymishra4232]

very nice explanation

[@filipfolkesson3865]

Here you say that the producer thread becomes blocked, but didn't we state in another video that if the blocking queue was full the rejectionhandler would act accordingly to the specifiec policy?

[@tridipchakraborty89]

That was with respect to a Custom threadpool implemented using an array blocking queue, where if all the the threads were busy and max threadpool size is reached, it will reject new incoming tasks. The rejection handler will then act according to specific policy

[@MrMikomi]

Very good thanks

[@BhawaniSingh-jc7cw]

Great... Thanks

[@Abhishekkumar-ri9wp]

nice explanation

[@shellindebted5328]

May i ask you to provide few use cases of Blocking/Synchronous Queue . it would be of great help.

[@DefogTech]

BlockingQueue is typically used for any problem of type producer consumer (BTW it's also used within Executor service to store tasks). Synchronous queue can be used for rate limiting where in one thread will accept request only after handing off it's task to a worker thread... If worker thread is busy it will have to wait and cannot accept new requests (BTW its also used in Cached thread pool where each new task directly created new thread and task itself is not stored in queue)

[@anandkulkarni2111]

Syncronized pub sub where a message needs to be distributed in acknowledged manner by handshake from reciever

[@TheRoxGo]

very good explanation! thanks

[@DefogTech]

Thank you! I'm glad it helped

[@360Legion]

Could you make a video of Linked and ArrayBlockingQueue

[@DefogTech]

Sure, will add to the list, though might take a while. I have many in the queue

[@DavisTibbz]

So this is equivalent to go channels

[@kostasgkoutis8534]

Yeah, kind of, except that this queue can not buffer, can not signal to the readers that the queue is writer is done, no timout, etc. I would look to LinkedTransferQueue for more functionality.

[@anandkulkarni2111]

I just realized that synchrnous queue can be implemented using exchanger concurrency class producer thread sends data and recieves nothing at exchange method Consumer thread sends nothing and recieves data 🤔

[@MrMikomi]

Was just wondering about the exchanger class myself

[@kfliden]

How does it work if there are multiple producers and consumers?

[@DefogTech]

If there are multiple producer threads, only 1 thread will be allowed to offer/put (which in turn will need to wait for a corresponding consumer thread for hand-off)... rest of the producer threads will wait for their chance (they will be in blocking/waiting state until they get their turn). The constructor allows a fairness boolean value which determines if the waiting producer threads are allowed in first-in-first-out order. Same flow for multiple simultaneous consumers.

[@kfliden]

@@DefogTech Great, thanks for the explanation!

[@suryanarayansubudhi9439]

Please make video on concurrent collection..

[@DefogTech]

Sure, which one?

[@suryanarayansubudhi9439]

@@DefogTech concurrent hashmap

[@DefogTech]

Cool, will add it to the list

[@kannadasans7564]

When to use Synchronous Queue

[@DefogTech]

Its used when 2 threads need to coordinate to hand-over a task/event. In CachedThreadPool its used to submit task (to create new thread). In practical scenarios I have not encountered much use for Synchronous Queue

[@mrrishiraj88]

🙏💯👍

[@vinitsunita]

Awesome explaination