charmby’s gists

charmby / scala implicit.txt

Created August 21, 2019 08:12

	import shapeless._
	case class MyClass(field1: String, field2: Int)

	def fieldName[A](fieldKey: Witness.Lt[_ <: Symbol])(implicit mkl: MkFieldLens[A, fieldKey.T]) = {
	lens[A] >> fieldKey
	fieldKey.value.name
	}

	println(fieldName[MyClass]('field1))

charmby / trapezium.py

Created March 18, 2018 15:43 — forked from samrat/trapezium.py

Definite integration using the trapezium rule

	from __future__ import division

	def trapezium(f, n, a, b):
	'''
	f- function [f(x)]
	n- number of trapeziums
	a- lower limit
	b- upper limit
	Returns definite integral of f(x) from range a to b
	'''

charmby / Json2JavaMap.scala

Created August 29, 2017 12:26 — forked from schmohlio/Json2JavaMap.scala

parse Json to Generic Java Map in Scala, similar to Jackson.

	import com.google.gson.Gson
	import java.util.{Map => JMap, LinkedHashMap}

	type GenericDecoder = String => JMap[String, Object]

	val decoder: GenericDecoder = {
	// Gson instances are apparently thread-safe, so curry...
	val gson: Gson = new Gson()
	// LinkedHashMap preserves ordering. use HashMap if not required.
	x => gson.fromJson(x, (new LinkedHashMap[String, Object]()).getClass)

charmby / main.scala

Created April 25, 2017 14:15 — forked from atamborrino/main.scala

Spark Streaming Kafka at-least-once with manual offset commit in Zookeeper (i.e not using Spark Streaming checkpoints that may be not recoverable after code changes)

	import kafka.common.TopicAndPartition
	import kafka.message.MessageAndMetadata
	import kafka.serializer.StringDecoder
	import com.samsung.sami.common.Curator
	import org.apache.spark.streaming._
	import org.apache.spark.streaming.kafka._
	import org.apache.spark.{Logging, SparkConf}
	import org.scalactic.{One, Bad, Good}

	import scala.util.control.NonFatal

charmby / main.scala

Created April 25, 2017 14:15 — forked from atamborrino/main.scala

Spark Streaming Kafka at-least-once with manual offset commit in Zookeeper (i.e not using Spark Streaming checkpoints that may be not recoverable after code changes)

	import kafka.common.TopicAndPartition
	import kafka.message.MessageAndMetadata
	import kafka.serializer.StringDecoder
	import com.samsung.sami.common.Curator
	import org.apache.spark.streaming._
	import org.apache.spark.streaming.kafka._
	import org.apache.spark.{Logging, SparkConf}
	import org.scalactic.{One, Bad, Good}

	import scala.util.control.NonFatal

charmby / redisStream.scala

Created April 25, 2017 14:14 — forked from atamborrino/redisStream.scala

Parallel SCAN per node on a Redis Cluster as an Akka Stream Source

	import akka.NotUsed
	import akka.stream.scaladsl.Source
	import redis.clients.jedis.{Jedis, JedisCluster, ScanParams}

	import scala.collection.JavaConverters._
	import scala.concurrent.Future

	class RedisStream(maxNodeParallelism: Int)
	(implicit jedisCluster: JedisCluster,
	blockingEC: RedisBlockingEC) {

charmby / Deserialization.scala

Created February 3, 2017 13:15 — forked from ramn/Deserialization.scala

Object serialization example in Scala

	import java.io._

	@SerialVersionUID(15L)
	class Animal(name: String, age: Int) extends Serializable {
	override def toString = s"Animal($name, $age)"
	}

	case class Person(name: String)

	// or fork := true in sbt

charmby / 0_reuse_code.js

Created July 17, 2016 09:56

Here are some things you can do with Gists in GistBox.

	// Use Gists to store code you would like to remember later on
	console.log(window); // log the "window" object to the console

charmby / imouto.hosts

Last active October 8, 2016 05:15 — forked from phoenixlzx/imouto.hosts

google host

	#+BEGIN
	#+UPDATE_TIME 2014-09-04 16:30:00
	#+MESSAGE
	#######################################################################
	#
	# imouto.host
	#
	# 主页：https://plus.google.com/100484131192950935968/posts
	#
	# #Ver : 2.11.0468 Sakura Chiyo

zuhan charmby