[Distributed_systems] week 8?

Sun Apr 5 12:25:42 CEST 2020

Hi,

To be honest, I think Márk has really good tasks in this area:
I have added an English translation to the tasks:

---

Készíts olyan chat alkalmazást, amelyben a két kliensnek nem kell egymásra
várnia soronként, hanem bármikor beszélhetnek egymáshoz, és ez azonnal
kiíródik a másik kliensnél. `AsyncChatServer.java` és `AsyncChatClient.java`
*Create a chat application, where the two clients don't have to wait for
each other. Instead, they can talk to each other anytime, and their message
immediately printed at the other client.*
---

Készíts chat szervert, amelyhez tetszőleges számú kliens kapcsolódhat,
illetve bármikor bonthatják is a kapcsolatot. Minden kliens először a nevét
közli egy sorban. A kliensek bármikor beszélhessenek, ami azonnal íródjon
ki minden kapcsolódott kliensnél. `NamedChatServer.java` és
`NamedChatClient.java`
*Create a chat server, where any number of clients can join, and they can
disconnect any time. Every client first sends its name. Clients can talk
any time, and the message of a client shall be printed out at every other
client.*

---

Adott két szerver. Az első szerver két parancssori paramétere egy cím és
port, melyen egy második szerverhez tud csatlakozni, és névként a `server`
szót küldi át, melyből a másik szerver tudja, hogy szerver kapcsolódott
hozzá. A kliensek csatlakoznak tetszőlegesen egyik vagy másik szerverhez,
melyekre üzeneteket küldenek. Ha egy kliens az üzenetét elküldte egy
szervernek, akkor az a másik szerverhez átküldi azt, amelyik továbbítja
azokat a hozzá csatlakozó kliensek számára. `MultiChatServer.java` és
`MultiChatClient.java`

*There are 2 servers. The first server can be started with an address and a
port as command line argument. These arguments are used to connect to
another server, with server as a name. The other server knows from this
name, that a server is connected to it. Clients can connect to any of the
servers, and send messages. When a client sends a message to server, it
sends it to the another server, which broadcasts it to all its clients.*

---

So here is my plan:
*Please note, that my class is 10-12 Monday.*

1) Give the video to the student. Latest this evening
2) First exercise is the one which the video is about. *I agree with Tamás,
that it could be homework, but I hardly think, students would be ready with
it by tomorrow morning.*
3) Once this task is done, they would get the next two tasks.
4)Of course, there are faster and slower people in the class. I would like
to post these tasks in BEAD. (I have already asked Artúr to create the
group for me) I don't say, I will go through each and every solution,
because it is a lot of time and effort. But I would like to give the
students the feeling, that they need to work, and they get real assignments
during the class.
5) And I would give 20-30 minutes for each task for them to complete. Then
I would go to *demo mode, and show them the tricky parts.*

*What do you think?*

Regards,
Peter

On Fri, Apr 3, 2020 at 11:39 AM Lukács Dániel <dlukacs at caesar.elte.hu>
wrote:

> Hi!
>
> Thank you for being on time! :) I watched the video just now, I think the
> quality is good overall! I noticed maybe a few breaks that could be edited
> out before the final release, but let's see if the others find it
> necessary. I appreciated the figures, and that you point to the words you
> talk about.
>
> So the content is an introduction of the task of parallelizing the chat
> server and chat client with some code examples.
>
> What's your plan for the students (and instructors) to do during the class?
>
> Thanks,
> Dániel
>
>
> On 4/2/20 10:52 PM, Grünwald Péter wrote:
>
> Hi,
> I have created a video. It is 10:41 minutes long.
> I have just uploaded it in Teams.
>
> https://ikelte.sharepoint.com/sites/DistributedSystemsStaff2/Megosztott%20dokumentumok/General/2020-04-02%2022-34-21.mkv
>
>
> Please check it, and come back with comments. I am sure, you will have
> some :)
> I would like to thank a lot to Márk, as I used his implementations for the
> demonstration. Thanks! :)
>
> Let's collect the comments, and then I can create a new video if needed.
> Regards,
> Peter
>
> On Thu, Apr 2, 2020 at 9:45 PM Lukács Dániel <dlukacs at caesar.elte.hu>
> wrote:
>
>> Hi!
>>
>> Superb! It should be Hungarian. I will translate it to Charles.
>>
>> Dániel
>>
>>
>> On 4/2/20 9:42 PM, Grünwald Péter wrote:
>>
>> Hi,
>> Sorry, that I forgot to ask:
>> What should be the language of the video?
>> Hungarian or English?
>>
>> I am about to start the recording :)
>>
>> Regards,
>> Peter
>>
>> On Thu, Apr 2, 2020 at 11:37 AM Lukács Dániel <dlukacs at caesar.elte.hu>
>> wrote:
>>
>>> Hi Péter,
>>>
>>> Thank you, that would be perfect! I think the easiest way to share a
>>> working copy internally is to simply upload it as a file to the Staff team.
>>> Each of us already has access there, and it's very easy to reupload new
>>> versions if needed.
>>>
>>> Dániel
>>>
>>>
>>> On 4/2/20 8:27 AM, Grünwald Péter wrote:
>>>
>>> Hi,
>>> I will be able to work on my video today evening, so most probably it
>>> will be ready for tomorrow morning, or late this night.
>>>
>>> The reason I am not really available on Team is, that at Ericsson we
>>> also use Teams, and I cannot be logged in with 2 different accounts. So I
>>> always need to swap.
>>>
>>> Regards,
>>> Peter
>>>
>>> On Mon, Mar 30, 2020 at 8:30 PM Török Márk <tmark at caesar.elte.hu> wrote:
>>>
>>>> Hi All,
>>>>
>>>> Do we have a streaming server? Where can we store these videos and how
>>>> can we make them available for students?
>>>>
>>>> Thank you,
>>>> Mark
>>>>
>>>>
>>>> 2020 Március 30, Hétfő 14:25 CEST dátummal, Lukács Dániel <
>>>> dlukacs at caesar.elte.hu> ezt írta:
>>>>
>>>> > Hi!
>>>> >
>>>> > That's awesome! :) I think most of us are new to this, so it's still
>>>> all
>>>> > experimental.
>>>> >
>>>> > The length should be around 20 minutes. Maybe less, but definitely
>>>> not
>>>> > more.
>>>> >
>>>> > I guess the topic is mostly up to you (until it's multithreaded
>>>> servers
>>>> > :)), but if you need a plan:
>>>> >
>>>> >   * The *video* could be some theory intro and a demo about moving
>>>> from
>>>> >     iterative server to multithreaded server. (With iterative server,
>>>> >     one client has to wait until the other client finished
>>>> >     communication. Threads can solve this problem.) If you don't want
>>>> to
>>>> >     code everything from scratch, it may be a good idea to create a
>>>> >     supplementary handout and refer to that in the video.
>>>> >   * During class they could implement Robi's chat server and chat
>>>> client
>>>> >     during *class*. They will need a detailed assignment text for
>>>> this.
>>>> >     As Robi said, a demo (or written instruction) could be necessary
>>>>
>>>> >     here if there are difficult or unexpected or tricky operations.
>>>> >   * Finally, they could solve Robi's HTTP server for *homework*. They
>>>> >     will need a detailed assignment text for this.
>>>> >
>>>> > If they have this down, then week 9 could be about implementing
>>>> > ping-pong and avoiding deadlocks.
>>>> >
>>>> > Is it realistic for you to finish the video until Thursday night? We
>>>> > could then review it on Friday and publish it, so students would have
>>>> > time to watch it during the weekend.
>>>> >
>>>> > Bests,
>>>> >
>>>> > Dániel
>>>> >
>>>> >
>>>> > On 3/30/20 10:17 AM, Grünwald Péter wrote:
>>>> > > Sziasztok!
>>>> > >
>>>> > > Hát ilyen videót még nem csináltam, de megpróbálom.
>>>> > > Milyen hosszú legyen?
>>>> > > Milyen témákat tárgyaljon pontosan?
>>>> > >
>>>> > > Üdv,
>>>> > > Péter
>>>> > >
>>>> > > On Sun, Mar 29, 2020 at 1:16 PM Lukács Dániel <
>>>> dlukacs at caesar.elte.hu
>>>> > > <mailto:dlukacs at caesar.elte.hu>> wrote:
>>>> > >
>>>> > >     Dear All,
>>>> > >
>>>> > >     No one signed up yet for preparing teaching materials for week
>>>> 8 (the
>>>> > >     one starting on April 6). The topic is Multithreaded
>>>> client-server 1.
>>>> > >
>>>> > >     I would do it because new topics are usually easier, but I'm
>>>> already
>>>> > >     working on the large assignment :(
>>>> > >
>>>> > >     Péter, is it possible for you to prepare the materials for week
>>>> 8?
>>>> > >
>>>> > >     Dániel
>>>> > >
>>>>
>>>>
>>>>
>>>>
>>>>
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