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💻
Think -> Code -> Solve

ShankarShastri shankarshastri

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Think -> Code -> Solve
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View Trie.scala
case class TrieNode[T](edgeList: Map[T, TrieNode[T]] = Map.empty[T, TrieNode[T]], isLeaf: Boolean = false,
isEntry: Boolean = false)
object TrieNode {
def emptyTrieNode[T]: TrieNode[T] = {
TrieNode[T]()
}
def newTrieNode[T](data: T): TrieNode[T] = {
TrieNode[T](edgeList = Map[T, TrieNode[T]]((data, emptyTrieNode[T])))
@shankarshastri
shankarshastri / Client example
Created Jun 8, 2020 — forked from rklaehn/Client example
akka http file server
View Client example
package akkahttptest
import akka.http.Http
import akka.stream.ActorFlowMaterializer
import akka.actor.ActorSystem
import akka.stream.scaladsl.{Sink, Source}
import akka.http.model._
object TestClient extends App {
@shankarshastri
shankarshastri / 2019-https-localhost.md
Created May 9, 2020 — forked from cecilemuller/2019-https-localhost.md
How to create an HTTPS certificate for localhost domains
View 2019-https-localhost.md

How to create an HTTPS certificate for localhost domains

This focuses on generating the certificates for loading local virtual hosts hosted on your computer, for development only.

Do not use self-signed certificates in production ! For online certificates, use Let's Encrypt instead (tutorial).

@shankarshastri
shankarshastri / letsencrypt_2020.md
Created May 9, 2020 — forked from cecilemuller/letsencrypt_2020.md
How to setup Let's Encrypt for Nginx on Ubuntu 18.04 (including IPv6, HTTP/2 and A+ SSL rating)
View letsencrypt_2020.md

How to setup Let's Encrypt for Nginx on Ubuntu 18.04 (including IPv6, HTTP/2 and A+ SLL rating)


Virtual hosts

Let's say you want to host domains first.com and second.com.

Create folders for their files:

View KafkaProducerConsumerAvro.scala
import java.io.ByteArrayOutputStream
import java.time.Duration
import java.util.concurrent.Executors
import java.util.{Properties, Timer, TimerTask, UUID}
import Models.{Message, SystemMessage, UserMessage, msgAvroSchema}
import com.sksamuel.avro4s.{AvroInputStream, AvroOutputStream, AvroSchema}
import org.apache.kafka.clients.consumer._
import org.apache.kafka.clients.producer._
import org.apache.kafka.common.errors.WakeupException
@shankarshastri
shankarshastri / redis-master.yaml
Last active Jan 29, 2020
Redis And Redis Insight
View redis-master.yaml
apiVersion: v1
kind: Service
metadata:
name: redis-service
spec:
type: LoadBalancer
selector:
app: redis
ports:
- name: redis
View Applied-FP-with-Scala.md

Applied Functional Programming with Scala - Notes

Copyright © 2016-2018 Fantasyland Institute of Learning. All rights reserved.

1. Mastering Functions

A function is a mapping from one set, called a domain, to another set, called the codomain. A function associates every element in the domain with exactly one element in the codomain. In Scala, both domain and codomain are types.

val square : Int => Int = x => x * x
@shankarshastri
shankarshastri / gist:4d496958d7d0b06f568ee043f2637ab4
Created Jan 2, 2020 — forked from cvogt/gist:9193220
Slick: Dynamic query conditions using the **MaybeFilter** (Updated to support nullable columns)
View gist:4d496958d7d0b06f568ee043f2637ab4
import scala.slick.lifted.CanBeQueryCondition
// optionally filter on a column with a supplied predicate
case class MaybeFilter[X, Y](val query: scala.slick.lifted.Query[X, Y]) {
def filter[T,R:CanBeQueryCondition](data: Option[T])(f: T => X => R) = {
data.map(v => MaybeFilter(query.filter(f(v)))).getOrElse(this)
}
}
// example use case
import java.sql.Date
View thread-pools.md

Thread Pools

Thread pools on the JVM should usually be divided into the following three categories:

  1. CPU-bound
  2. Blocking IO
  3. Non-blocking IO polling

Each of these categories has a different optimal configuration and usage pattern.

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