kotlinlang #server

I have composed a proposal for GHC-2020. I used Kofu + Arrow Request you to please spend a few minutes reviewing it and pass some feedback. If you need any clarifications while reviewing, I shall be happy to discuss it. Thanks 🙂 https://overfullstack.github.io/posts/top-with-ad-hoc-polymorphism/

👍 2

Gregor Zeitlinger

04/20/2020, 7:11 AM

@elizarov

Adabe Echaim

04/21/2020, 9:04 AM

Hello everybody, I am using the Ktor framework. I want to integrate Firestore database to my web API. I dont know if it supports Firebase products. If it does, please point me to helpful resources as I have scoured both Ktor and Firebase docs without result. Thanks. PS: I am still a beginner at both the Kotlin language and Ktor

crummy

04/21/2020, 9:06 AM

probably this is what you want? https://github.com/firebase/firebase-admin-java

👍 3

🧵 5

jean-paul

04/26/2020, 9:00 AM

Hello server side Kotliners, From my past experiences, I am an user of

spring webflux

with `reactor`… I would want to give a try to

coroutines

instead but I ask myself if it would support all

reactive stream

promises like

back-pressure

. I would want my workflow unchanged: reactive streams in my services and reactive drivers for db’s I/O & ... should not be affected negatively! Is it possible? What I can win from this move? Thx

👀 1

kenkyee

04/26/2020, 11:15 AM

It supports backpressure via the Flow class. If you're happy with Reactor, it only buys you more sequential looking code. Same thing on Android if you're using RxJava..

Hernan Ojeda

04/26/2020, 2:55 PM

Hi @Pypdeveloper! When you have to build an application, you will generally have two parts: the front-end and the back-end. In this case it would be correspondingly client-side and server-side. If you have ever used maven or gradle you can include the kotlin plugin and start developing without problems using all the benefits of this beloved language.

🧵 2

Pypdeveloper

04/26/2020, 3:11 PM

@Hernan Ojeda thanks

👍 1

🧵 1

Mike Conley

05/09/2020, 1:41 PM

Anyone have any experience with jdbi/kotlin? I'm having issues with generic types that I think would work just fine in java.

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import org.jdbi.v3.core.Jdbi
import org.jdbi.v3.sqlobject.statement.SqlQuery
import java.time.Duration
import javax.inject.Inject

class StupidDAO @Inject constructor(jdbi: Jdbi) : StupidSql by jdbi.onDemand(StupidSql::class.java) {
    companion object {
        @JvmStatic
        fun main(args: Array<String>) {
            val jdbi = DatabaseTestBase.jdbi // Connects to my postgresql test database.
            val stupidDAO = StupidDAO(jdbi)
            println(stupidDAO.doIt())
        }
    }
}

private interface StupidSql {
    @SqlQuery("""
            SELECT 'a' as id,
                   interval '1 hour' as value
        """)
    fun doIt(): List<StupidThing<Duration>>
}

data class StupidThing<T>(
        val id: String,
        val value: T
)

blows up with

Joan Sala

05/12/2020, 8:10 PM

Hello everybody. I think it would be useful for server-side Kotlin to provide useful extensions to the Java's ProcessBuilder API like Groovy does. I'm thinking in methods like waitForProcessOutput: https://github.com/groovy/groovy-core/blob/master/src/main/org/codehaus/groovy/runtime/ProcessGroovyMethods.java#L187 Is it a good idea if I try to find time to contribute this? Or maybe this is already in the roadmap? Thanks for your feedback.

Ananiya

05/15/2020, 7:50 AM

https://kotlinlang.slack.com/archives/C0B8M7BUY/p1589528254060900

Mgkaki

06/05/2020, 12:59 PM

https://github.com/viartemev/ktor-kafka-example/blob/master/src/me/viartemev/ktor/feature/BackgroundJob.kt Can I recreate this source (BackgroundJob.kt) in kotlin-springboot project without io.ktor pakcages ?

Tiagoeiras

06/10/2020, 12:45 PM

Hi all I have some issues using kotlin with kafka streams. I’m trying to make a join with a foreign key but I’m facing an error like :

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leftTable.join(rightTable, myleftObject::getIdRight, LeftRightJoiner())

the error is : None of the following functions can be called with the arguments supplied. join(KTable<TypeVariable(KO)!, TypeVariable(VO)!>!, ((t: myleftObject!) → TypeVariable(KO)!)!, ((value1: myleftObject!, value2: TypeVariable(VO)!) → TypeVariable(VR)!)!) where VR = TypeVariable(VR), KO = TypeVariable(KO), VO = TypeVariable(VO) for fun <VR : Any!, KO : Any!, VO : Any!> join(other: KTable<KO!, VO!>!, foreignKeyExtractor: ((t: myleftObject!) → KO!)!, joiner: ((value1: myleftObject!, value2: VO!) → VR!)!): KTable<String!, VR!>! defined in org.apache.kafka.streams.kstream.KTable I have taken this from https://kafka-tutorials.confluent.io/foreign-key-joins/kstreams.html but this is in java language Can somebody help me with this ?

Remon Shehata

06/13/2020, 8:59 PM

hello guys, I want to store videos on a server and stream it on my mobile app. what would be my best options here?

Brian Dilley

06/13/2020, 9:48 PM

HTTP

Brian Dilley

06/13/2020, 9:48 PM

the appropriate decision depends on so many other factors though.

Brian Dilley

06/13/2020, 9:49 PM

how large are the video files? do you want it to adjust bitrate according to the client’s internet speed? will you allow your client to scrub through the video (ie: fast forward and reverse). Also - what’s this gotta do with Kotlin?

Brian Dilley

06/13/2020, 9:51 PM

if you’re just creating an instagram clone (No scrubbing, short videos), just make sure to transcode your videos to a specific bitrate and codec and just use simple HTTP for it.

Brian Dilley

06/13/2020, 9:52 PM

Either way, you’re probably going to want to use the h264 codec for video, aac for audio, and mp4 as the container.

👍 7

🧵 1

parth

06/18/2020, 7:45 PM

hey friends, crosspost from twitter (https://twitter.com/JvmName/status/1273673050475466752) I’m looking for books or really in-depth articles on 1. backend architecture 2. backend design patterns 3. reusable+scalable components (e.g. routes, controllers, middleware, etc.) The stack is Kotlin (spark-java) + Postgres, but I’ll take good resources, regardless of language/framework! The team are all seniorish (6+ years) devs, so we don’t need hand-holding, but more reification of best-practices and good design strategies

Kepha

07/08/2020, 2:40 AM

https://api.ktor.io/1.3.0/io.ktor.network.sockets/-socket-options/-t-c-p-client-socket-options/index.html Can I set lingerSeconds option in WebsocketSession like the above link(TCPClientSocketOptions) ? I think that WebSocket also use TCPSocket in low level …

Jason5lee

07/25/2020, 4:12 AM

image.png

07/25/2020, 12:19 PM

👋 I’m here! What did I miss?

Gopal Kalyanaraman

08/04/2020, 1:39 PM

I keep getting unresolved reference

Gopal Kalyanaraman

08/04/2020, 1:40 PM

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<plugin>
                <groupId>org.jetbrains.kotlin</groupId>
                <artifactId>kotlin-maven-plugin</artifactId>
                <version>1.3.72</version>

                                <configuration>
                                    <args>
                                        <arg>-Xjsr305=strict</arg>
                                    </args>
                                    <compilerPlugins>
                                        <plugin>spring</plugin>
                                    </compilerPlugins>
                                    <jvmTarget>11</jvmTarget>

                                </configuration>
                <executions>
                    <execution>
                        <id>compile</id>
                        <phase>compile</phase>
                        <goals> <goal> compile </goal> </goals>
                    </execution>
                    <execution>
                        <id>test-compile</id>
                        <goals> <goal> test-compile </goal> </goals>
                    </execution>
                </executions>
                                <dependencies>
                                    <dependency>
                                        <groupId>org.jetbrains.kotlin</groupId>
                                        <artifactId>kotlin-maven-allopen</artifactId>
                                        <version>${kotlin.version}</version>
                                    </dependency>
                                    <dependency>
                                        <groupId>com.adobe.ams.ifttt</groupId>
                                        <artifactId>commons</artifactId>
                                        <version>0.0.1-SNAPSHOT</version>
                                    </dependency>
                                </dependencies>
            </plugin>

Gopal Kalyanaraman

08/04/2020, 1:40 PM

is the plugin i use

xii

08/20/2020, 11:42 PM

hey! I'm moving away from normal spring mvc to webflux with netty, does anybody know a way to implement filterChains in it?

Ayodele

08/29/2020, 9:11 AM

I have all my dependencies right

Helio

08/31/2020, 11:02 PM

Hello guys! I was wondering if someone could give me a hand configuring a proxy using Ktor with CIO engine. I’ve been struggling to get it worked… I’m constantly receiving exceptions such as:

Untitled

Gopal Kalyanaraman

09/03/2020, 9:41 AM

Please share some examples of a complex actor used with spring services..I wnt to understand how to inject/use them and how to manage their lifecycle