DmitryBe

COUNTER_URL=http://172.17.6.114:8888/count

# get uniq increment val by key
curl ${COUNTER_URL}/my_key

# reset counter by key
curl -X DELETE ${COUNTER_URL}/my_key

# post key value
curl -X POST -d '{"key": "my_key", "val": "some_value"}' ${COUNTER_URL}/count

DmitryBe

set -g prefix `
bind ` send-keys `

unbind %
bind \ split-window -h
bind - split-window -v

DmitryBe

# install dependencies
sudo apt-get install python-pip python-dev
pip install --upgrade pip
sudo apt-get install openjdk-8-jdk git python-dev python3-dev python-numpy python3-numpy build-essential python-pip python3-pip python-virtualenv swig python-wheel libcurl3-dev

# install bazel
echo "deb [arch=amd64] http://storage.googleapis.com/bazel-apt stable jdk1.8" | sudo tee /etc/apt/sources.list.d/bazel.list
curl https://bazel.build/bazel-release.pub.gpg | sudo apt-key add -
sudo apt-get update

DmitryBe

### Pattern matching

  1. CTRL-G  displays your location in the file and the file status.
             G  moves to the end of the file.
     number  G  moves to that line number.
            gg  moves to the first line.

  2. Typing  /  followed by a phrase searches FORWARD for the phrase.
     Typing  ?  followed by a phrase searches BACKWARD for the phrase.

DmitryBe

// using math.pow
public static double round(double value, int places) {
    if (places < 0) throw new IllegalArgumentException();

    long factor = (long) Math.pow(10, places);
    value = value * factor;
    long tmp = Math.round(value);
    return (double) tmp / factor;
}

DmitryBe

# docker image: https://hub.docker.com/_/redis/

# start redis server with append
docker run -itd --name redis --net=host -v /docker/redis/data:/data redis redis-server --appendonly yes

# start redis cli (localhost)
docker run -it --net=host --rm redis redis-cli -h localhost -p 6379

# get multiple values
MGET key1, keyN

DmitryBe

val a: PartialFunction[String, Int] = { case "a" => 1 }
val b: PartialFunction[String, Int] = { case "b" => 2 }
val c: PartialFunction[String, Int] = { case "c" => 3 }

val ab = a orElse b // combine functions a and b

ab("a") // 1
ab("b") // 2
ab("c") // MatchError

DmitryBe

import akka.actor.Status.Failure
import akka.actor.{Actor, ActorLogging, ActorRef, ActorRefFactory, ActorSystem, PoisonPill, Props}
import akka.dispatch.ExecutionContexts
import akka.testkit.{ImplicitSender, TestKit}
import org.scalatest._
import scala.concurrent.duration._
import akka.pattern.{ask, pipe}
import akka.util.Timeout

/*

DmitryBe

import com.twitter.algebird.HyperLogLogMonoid

//define test data
val data = Seq("aaa", "bbb", "ccc")
//create algebird HLL
val hll = new HyperLogLogMonoid(bits = 10)
//convert data elements to a seq of hlls
val hlls = data.map { str =>
  val bytes = str.getBytes("utf-8")
  hll.create(bytes)

DmitryBe

import scala.concurrent.Await
import scala.concurrent.ExecutionContext
import scala.concurrent.Future
import scala.concurrent.blocking
import scala.concurrent.duration.Deadline
import scala.concurrent.duration.Duration
import scala.concurrent.duration.DurationInt
import scala.concurrent.duration.DurationLong
import scala.concurrent.future
import scala.concurrent.promise