Requirements

Zoom workshop questions archive

From Tushar Mathur to Everyone: (6:24 p.m.)can you share the discord channel pleaseFrom Kai to Everyone: (6:24 p.m.)https://discord.gg/ymHhUEFrom Courtney De Goes to Everyone: (6:26 p.m.)https://discord.gg/FNenRTNFrom Alex Berg to Everyone: (6:27 p.m.)Thank you for your patience Pavel!From Gontu Harish to Everyone: (6:28 p.m.)I happen to hear weird noises from speaker's mic alsoFrom Angeline Tan to Everyone: (6:30 p.m.)@Parvel what do you mean by dual tests?From Visar Zejnullahu to Everyone: (6:41 p.m.)can you please post that youtube link here?From Kai to Everyone: (6:43 p.m.)https://www.youtube.com/watch?v=CzpvjkUukAshttps://github.com/7mind/distage-examplehttps://izumi.7mind.io/distage/https://twitter.com/shirshovphttps://twitter.com/kai_nyashaFrom Mikhail Chugunkov to Everyone: (6:46 p.m.)+From Petros Kaklamanis to Everyone: (6:46 p.m.)yesFrom Alex Berg to Everyone: (6:46 p.m.)yeahFrom Vasiliy Efimov to Everyone: (6:46 p.m.)yesFrom Igor Udovichenko to Everyone: (6:46 p.m.)yesFrom Angeline Tan to Everyone: (6:46 p.m.)tesFrom Rafal Pietruch to Everyone: (6:46 p.m.)yFrom Uladzislau Safronau to Everyone: (6:46 p.m.)YesFrom Visar Zejnullahu to Everyone: (6:46 p.m.)yepFrom Anton Semenov to Everyone: (6:46 p.m.)Yes.From Angeline Tan to Everyone: (6:46 p.m.)yesFrom Sundararaman Venkataraman to Everyone: (6:46 p.m.)yesFrom Nikolay Artamonov to Everyone: (6:46 p.m.)yepFrom Vasiliy Efimov to Everyone: (6:47 p.m.)Fonts are okFrom Alex Berg to Everyone: (6:47 p.m.)It's ok I thinkFrom Angeline Tan to Everyone: (6:47 p.m.)Yes that font is okFrom Mikhail Chugunkov to Everyone: (6:47 p.m.)it's okFrom Sundararaman Venkataraman to Everyone: (6:47 p.m.)fonts are okFrom Rafal Pietruch to Everyone: (6:47 p.m.)fonts are fineFrom Igor Udovichenko to Everyone: (6:47 p.m.)will we have access to the record of this presentation?From Courtney De Goes to Everyone: (6:47 p.m.)YesFrom Andrey Patseev to Everyone: (6:47 p.m.)It says I can’t unmute myselfFrom Courtney De Goes to Everyone: (6:48 p.m.):-( Try again?From Andrey Patseev to Everyone: (6:48 p.m.)same sadlyFrom Gastón Schabas to Everyone: (6:49 p.m.)Can't unmute myselfFrom Vasiliy Efimov to Everyone: (6:49 p.m.)sameFrom Andrey Patseev to Everyone: (6:49 p.m.)Now worksThank youFrom Angeline Tan to Everyone: (6:50 p.m.)i cannot unmuteFrom Gastón Schabas to Everyone: (6:50 p.m.)not for me. It shows me a message saying that the host doesn't allow me to unmuteFrom Angeline Tan to Everyone: (6:50 p.m.)It says “you cannot unmute yourself because the host has muted you”From Marcos Iriarte to Everyone: (6:50 p.m.)I could unmute (and right after mute myself again)From Andrey Patseev to Everyone: (6:50 p.m.)Message “host asks you to unmute yourself” pops up and I can unmute myselfFrom Alex Berg to Everyone: (6:51 p.m.)unmute works for me nowFrom Valeriy Shinkevich to Everyone: (6:51 p.m.)Unmute works nowFrom Kai to Everyone: (6:51 p.m.)It may work only after “Raise hand”?From Gastón Schabas to Everyone: (6:51 p.m.)I recieve a request by the host to unmute me. I accepted the request, then mute me,and now I can't unmute me again because the host doesn't allow me. I guess the setupof the meeting is the issueFrom Angeline Tan to Everyone: (6:51 p.m.)ok when the host allows me to unmute, I can do so once, after I mute myself, I cannotunmute againFrom Andrey Patseev to Everyone: (6:52 p.m.)Courtney it allows you to unmute yourself only onceFrom dillinger0x04 to Everyone: (6:54 p.m.)OK I think I'm unmutedFrom Gastón Schabas to Everyone: (6:54 p.m.)I can't find a button to raise my hand. I guess it should be next to the chat button,share screen and else, right?From Alex Berg to Everyone: (6:54 p.m.)It is in the participants viewFrom Dheeraj Karande to Everyone: (6:54 p.m.)Go inside participant, at bottomFrom dillinger0x04 to Everyone: (6:55 p.m.)yeah, you have to hover your mouse pointer over the bottom of the screen for it to show upFrom Angeline Tan to Everyone: (6:56 p.m.)@Pavel ok got it. Tks.From Courtney De Goes to Everyone: (6:56 p.m.)I just tried to fix the automatic mute setting. Has anything changed?From Kai to Everyone: (6:56 p.m.)NoFrom Angeline Tan to Everyone: (6:56 p.m.)noFrom Courtney De Goes to Everyone: (6:57 p.m.):-(From Angeline Tan to Everyone: (6:57 p.m.)@Courtney its ok np. We can just raise our hand.From Kai to Everyone: (6:58 p.m.)Could be that recording conflicts with voluntary unmuteFrom Andrey Patseev to Everyone: (6:58 p.m.)How you raise a hand?From Kai to Everyone: (6:58 p.m.)Participants drop-down -> Raise handOn the bottom-right of the “Participants” dialogFrom Andrey Patseev to Everyone: (6:58 p.m.)Thank youFrom Kai to Everyone: (7:05 p.m.)Hmm, I can unmute nowCan anyone else?From Andrey Patseev to Everyone: (7:06 p.m.)Can as weellFrom Marcos Iriarte to Everyone: (7:06 p.m.)yes,From Semen Nevrev to Everyone: (7:36 p.m.)so components are wired using plugins?*by usingFrom Boris V Kuznetsov to Everyone: (7:37 p.m.)I guess by Distage DI machinery@kai ?From Semen Nevrev to Everyone: (7:40 p.m.)but I need to mark components on which i depend, and describe them before it^and only then di stuff will happen. Correct me if I’m wrongFrom Kai to Everyone: (7:40 p.m.)Yes, you specify bindings of interfaces-to-implementations in `ModuleDef`values and then pass them to distage for wiring. Plugins are a way to exposebindings indirectly, via classpath scan, instead of passing them as values.There are some advantages to this, e.g. you only have to create a new Pluginin a package so that it gets picked up, whereas if you pass them as valuesyou would also need to modify the point(s) at which you pass them - e.g.in your main scope and in test scopeFrom Kai to Everyone: (7:42 p.m.)Yes, unlike Spring or Guice, distage will not try to instantiate types thatdon’t have a specified implementation, and part of that is that it can’t doanything with such types because it’s not using runtime reflection at all(distage is also available for Scala.js where there’s no reflection either)From Kai to Everyone: (7:42 p.m.)@Semen NevrevFrom Илья Холинов to Everyone: (7:42 p.m.)are you using kind projector plugin?From Kai to Everyone: (7:42 p.m.)YesFrom Boris V Kuznetsov to Everyone: (7:43 p.m.)You use F[+_,+_]. So you can automatically resolve subclasses and ADTduring module wiring ?From Kai to Everyone: (7:44 p.m.)Not sure what do you mean by resolveFrom Semen Nevrev to Everyone: (7:44 p.m.)@kai thanks for the explanation! I guess more info is available in the documentationFrom Kai to Everyone: (7:44 p.m.)Yeah - there’s a doc for plugins - https://izumi.7mind.io/distage/distage-framework.html#pluginsFrom Angeline Tan to Everyone: (7:45 p.m.)@Pave, Sorry could you repeat that? The http server? (When you speak quickly,sometimes your voice breaks up)From Kai to Everyone: (7:45 p.m.)http4s Server[IO]From Boris V Kuznetsov to Everyone: (7:48 p.m.)Why to tag F[+_,+_] : TagKK ?From Semen Nevrev to Everyone: (7:49 p.m.)could you explain what does `weak` and `many` mean?I guess many means multiple instances of interface could be runbut what about weak?From Kai to Everyone: (7:51 p.m.)Tag, TagK, TagKK, etc. contain information about a type required to do the wiring.This information is available for all known types, but for type variables like `F` it must be passed as a type class (from where F was known to be a concrete type),   so that it gets the information of its actual typeFrom Kai to Everyone: (7:52 p.m.)`many[X]` creates a Set binding. That is, you can bind many instances of `X`here and summon a `Set[X]` of all instances that you have bound. e.g. herewe’ll use this for http routes. We have a Set[HttpApi[F]] and we’re goingto define a few HttpApi’s and expose themFrom Kai to Everyone: (7:53 p.m.)`.weak` creates a _weak_ binding to the set. This works somewhat like weakcollections on the JVM, e.g. WeakReference. It adds an object to the setonly IFF that object is also required by some other binding.From Kai to Everyone: (7:55 p.m.)It may be _not_ required for example if you have two main methods (roles)and only one of them requires that component. So if you run the other mainmethod, this object will be removed from the Set because it’s not requiredFrom Kai to Everyone: (7:55 p.m.)https://izumi.7mind.io/distage/advanced-features.html#weak-setsFrom Boris V Kuznetsov to Everyone: (7:56 p.m.)Nice logging. Is that logstage ?From Kai to Everyone: (7:56 p.m.)yesFrom Boris V Kuznetsov to Everyone: (7:57 p.m.)So all those `make`, `many`, etc are some macro ?From Kai to Everyone: (7:59 p.m.)No, but `.from[X]` uses a macro to generate a constructor for XAnd Tag/TagK/etc. are also generated implicitly by macrosFrom Anton Semenov to Everyone: (7:59 p.m.)I may be missing something, but should not be the compilation failingif some bindings are not available?From Boris V Kuznetsov to Everyone: (8:00 p.m.)Tag/TagK/etc use a reflection, right? Izumi.reflect packageFrom Kai to Everyone: (8:01 p.m.)They use compile-time reflection inside the macro and generate treesthat contain type informationFrom Semen Nevrev to Everyone: (8:07 p.m.)So users must duplicate dependencies of modules’ implementations inModuleDefs?From Илья Холинов to Everyone: (8:08 p.m.)is it possible to define modules depending on other modules? for exampleto define api module that explicitly shows that it depends on 2 repositories?From Kai to Everyone: (8:10 p.m.)No, modules simply collect bindings, you do not have to defineexplicit relationships.> So users must duplicate dependencies of modules’ implementations in ModuleDefs?From Angeline Tan to Everyone: (8:11 p.m.)how many mins is the breakFrom Kai to Everyone: (8:11 p.m.)Yeah, you need to add implicits & other parametersFrom Semen Nevrev to Everyone: (8:12 p.m.)u are miutedFrom Terry Lin to Everyone: (8:19 p.m.)does distage replace zio’s zlayer completely or does it coexistor even complement/enhance it?From Pavel Shirshov to Everyone: (8:22 p.m.)Distage can perfectly coexist with zlayer and we found it convenientto have them bothFrom Terry Lin to Everyone: (8:24 p.m.)it’d be great if you can show us an example of the two beingused together :)From Pavel Shirshov to Everyone: (8:25 p.m.)zlayer works nice as a service locator for local contexts whiledistage works great as a framework wiring together applicationcomponents. Even thousands of them.From Angeline Tan to Everyone: (8:25 p.m.)yesFrom Pavel Shirshov to Everyone: (8:27 p.m.)So, distage wires your application modules in the beginning ofthe application lifecycle and finalises your app, zlayer providescomputation contexts while the application is working. And theycan (and should) perfectly coexistFrom Uladzislau Safronau to Everyone: (8:33 p.m.)yesFrom Vasiliy Efimov to Everyone: (8:33 p.m.)yepFrom Semen Nevrev to Everyone: (8:33 p.m.)better nowFrom Angeline Tan to Everyone: (8:33 p.m.)yesFrom Semen Nevrev to Everyone: (8:34 p.m.)maybe zoom has functionaltiy to boost speaker’s audio like indiscord?From Boris V Kuznetsov to Everyone: (8:34 p.m.)Can I wire dependencies from another frameworks? I have implicitsand services, implemented in lagom/playFrom Boris V Kuznetsov to Everyone: (8:35 p.m.)The project is forced to use the lagom service locator. Which issilly, slow and extremely memory consuming Can I use ZLayer ordistage to wire deps from lagom/play? And avoid using lagom servicelocator altogetherFrom Terry Lin to Everyone: (8:36 p.m.)thanksFrom Pavel Shirshov to Everyone: (8:37 p.m.)Not sure about Lagom, I have no expertise. Most likely you maydo somethingFrom Angeline Tan to Everyone: (8:37 p.m.)@kai Hi could you push the changes for  zio env to a branchtksFrom Boris V Kuznetsov to Everyone: (8:40 p.m.)@pshirshov WHat is Kai showing now?From Angeline Tan to Everyone: (8:40 p.m.)I think he mentioned docker provisionFrom Pavel Shirshov to Everyone: (8:41 p.m.)@Boris: he is writing postgresql boilerplate. That part wasfor config deserialization (actually, just your typical pureconfig)From Boris V Kuznetsov to Everyone: (8:42 p.m.)So integration with postgres? I mean what was the use case ?From Angeline Tan to Everyone: (8:43 p.m.)@Parvel is he working on point 4 in the readme? “The applicationmust be able to self-provision its environment(*) when a Dockerdaemon is running on the local host.”From Pavel Shirshov to Everyone: (8:44 p.m.)@Boris He needed to read jdbc driver parameters from config file.He just wrapped transactor into a convenience helper and rightnow he is writing postgresql implementations for Ladder/ProfilesFrom Boris V Kuznetsov to Everyone: (8:45 p.m.)thxFrom Pavel Shirshov to Everyone: (8:45 p.m.)@Angeline Tan: he is just implementing PostgreSQL persistence,so point (1). But he will get to other points very soonFrom Angeline Tan to Everyone: (8:46 p.m.)@Parvel ok tksFrom Илья Холинов to Everyone: (8:47 p.m.)i see sometimes you use '*' and some time '?' . does it makessense?From Pavel Shirshov to Everyone: (8:47 p.m.)Nope, ? Is a legacy syntaxFrom Boris V Kuznetsov to Everyone: (8:47 p.m.)trait FaceDetectService extends Service {  implicit val requestSerializer = new ByteStringSerializer  def sendAvatarForCheck: ServiceCall[ByteString, FaceDetectResult]  override def descriptor: Descriptor = {    import Service._    named("face-detect")      .withCalls(        restCall(Method.POST, "/detect", sendAvatarForCheck)      )      .withAutoAcl(false)  }}@Pavel that's a snippet code with Lagom. Do you think I can uselagom-based services with Distage ?From Pavel Shirshov to Everyone: (8:50 p.m.)@Boris: Probably, it depends on how Lagom instantiates yourcomponentsFrom Anton Semenov to Everyone: (8:50 p.m.)What if one wants to use a migration tool, e.g. Flyway, and notinclude the DDL in the service definition? Would that mean thatrepository modules have to depend on a common migration modulethat just ensures that the database is up-to-date?From Pavel Shirshov to Everyone: (8:52 p.m.)@Anton Semenov: yup, something like that. You would create anotherresource(s) carrying your migrations and add them as dependenciesto your repositories. In case you don’t use a dependency directly,you may declare it on bindings level and avoid including it in yourconstructorFrom Anton Semenov to Everyone: (8:54 p.m.)So it's possible to explicitly define the modules' initializationorder in the second case?From Pavel Shirshov to Everyone: (8:55 p.m.)The order is defined by edges of your dependency graph. So yes,it’s possible to define order, but it wouldn’t be a strict sequentialorder. It would be a partial orderFrom Pavel Shirshov to Everyone: (8:56 p.m.)For example, there may be a different provisioner instantiatingindependent components of your application in parallelFrom Anton Semenov to Everyone: (8:56 p.m.)Ah, sure, a partial order would suffice. Thank you.From Pavel Shirshov to Everyone: (8:58 p.m.)Technically that’s what distal does - it turns your bindingsinto a DAG, so effectively it defines a partial order for thesteps of your application startup process*distageDamn spelling correction :)From Boris V Kuznetsov to Everyone: (9:01 p.m.)Do you plan to integrate this with ZIO Test ?From Pavel Shirshov to Everyone: (9:02 p.m.)@Boris: maybe. It won't be too hard and we would definitelywelcome a contributionFrom Boris V Kuznetsov to Everyone: (9:03 p.m.)I missed a bit on the start... Which BIO instances are youusing in this piece of code ?From Pavel Shirshov to Everyone: (9:07 p.m.)BIO should be enough for most of the purposes, in case youwant to separate capabilities - just explore the BIO hierarchyFrom Angeline Tan to Everyone: (9:15 p.m.)tksFrom Kai to Everyone: (9:16 p.m.)https://izumi.7mind.io/distage/distage-framework-docker.htmlFrom Angeline Tan to Everyone: (9:25 p.m.)Is the container also removed after the tests have completed?@kai Nice, tks.From Boris V Kuznetsov to Everyone: (9:31 p.m.)So Activation (Repo -> Repo.prod) is a heterogenous map ?From type to instanceFrom Pavel Shirshov to Everyone: (9:34 p.m.)@Angeline Tan: you may choose several policiesFrom Pavel Shirshov to Everyone: (9:35 p.m.)In distage 0.10 you may allow/disallow reuse, in case reusedisallowed the containers will be removed. Since 0.11 itwill be possible to allow reuse between test suites butdrop all the containers once the tests finishFrom Pavel Shirshov to Everyone: (9:36 p.m.)@Boris: nope, it's just a map: case class Activation(activeChoices: Map[Axis, AxisValue])From Angeline Tan to Everyone: (9:36 p.m.)@Kai what is the benefit of splitting into 2 rolesFrom Boris V Kuznetsov to Everyone: (9:37 p.m.)Guess for testing purposes. Mock and ProdFrom Pavel Shirshov to Everyone: (9:39 p.m.)@Angeline: it's like two separate microservices but ableto run in the same processIt may be very convenient for the following purposes:From Boris V Kuznetsov to Everyone: (9:40 p.m.)Does distage support an incremental composition? Like Zlayer >+> ?From Pavel Shirshov to Everyone: (9:40 p.m.)1) You may run a "perfect simulation" of your entierproduct within the same process2) It would allow you to increase computational densityof your deploymentFrom Angeline Tan to Everyone: (9:41 p.m.)@kai @pavel ok tksFrom Kai to Everyone: (9:53 p.m.)https://izumi.7mind.io/distage/debugging.html#graphviz-renderingFrom Kai to Everyone: (9:59 p.m.)https://github.com/7mind/izumi-example-lambdaconfFrom Semen Nevrev to Everyone: (9:59 p.m.)thanks!current version is missing PostgresPortCfgand config packageFrom Angeline Tan to Everyone: (10:03 p.m.)I cannot build the latest project locally.From Pavel Shirshov to Everyone: (10:03 p.m.)https://github.com/7mind/distage-exampleFrom Angeline Tan to Everyone: (10:03 p.m.)ok tksFrom Semen Nevrev to Everyone: (10:04 p.m.)okay, thanksFrom Angeline Tan to Everyone: (10:07 p.m.)An example error is get is: Error:(4, 22) object docker is not a member of package izumi.distageimport izumi.distage.docker.Docker.{AvailablePort, ClientConfig}Its ok no problem, I’ll clone the distal-example repo. tksFrom Pavel Shirshov to Everyone: (10:12 p.m.)@Angeline Tan: you may join our chat on telegram, @izumi_en,we will help you to sort that outFrom Angeline Tan to Everyone: (10:13 p.m.)@Parvel, ok tks,I'll try the second repo firstNo questions so far. Tks for the superb workshop :)From dillinger0x04 to Everyone: (10:17 p.m.)can we archive this text thread?From Kai to Everyone: (10:18 p.m.)https://izumi.7mind.io/distage/basics.html#multi-dimensionalityFrom Angeline Tan to Everyone: (10:18 p.m.)@Parvel the second repo works fine, tks!From dillinger0x04 to Everyone: (10:20 p.m.)impressive!From Semen Nevrev to Everyone: (10:20 p.m.)thank you for this workshop!From Sergey Klimov to Everyone: (10:20 p.m.)thanks!From Angeline Tan to Everyone: (10:20 p.m.)seeyaFrom Semen Nevrev to Everyone: (10:21 p.m.)bye!From Terry Lin to Everyone: (10:21 p.m.)thanksFrom Petros Kaklamanis to Everyone: (10:21 p.m.)thank you !