joecwu

published	tags
true	Docker

[Docker] Push Error

這篇同步發佈在我的Blog和Gist。

背景

joecwu

published	tags
true	ScaVaToScala Scala Scalaz Programming

[ScaVa->Scala] Scalaz Task 取代Scala Future來進行非同步處理的另一個選擇

這篇同步發佈在我的Blog和Gist。

Scala的Future用起來有什麼問題？

在Scala中，我們要處理asynchronous computations的時候應該都知道有Future這個好用的東西，但Future monad常讓我在進行error handling的時候有點困擾，我本來的回傳值若是有"成功"或"失敗"兩種case的時候，我們可以用Scalaz的disjuction或是Scalactic的Or來處理，但是加上Future後的結果會變成：

joecwu

published	tags
true	ScaVaToScala Scala Scalaz Programming

[ScaVa->Scala] Scalaz Writer Monad

這篇同步發佈在我的Blog和Gist。

之前一篇 [ScaVa->Scala] Scala中使用Reader Monad來實現Dependency Injection ，裡面提到了Scalaz中的Reader Monad，有Reader當然也要有個Writer呀!!

joecwu

Shortener Design Concept

Shortener

Shortener trait is an interface that defines core functions of shortener which is shorter & taller.

trait Shortener {
  def shorter(url:String)(implicit dbClient : DBClient, tracerInfo: TracerInfo) : String Or BaseException
  def taller(short:String)(implicit dbClient : DBClient, tracerInfo: TracerInfo) : String Or BaseException

}

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

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import java.io.{FileOutputStream, ByteArrayOutputStream, ByteArrayInputStream}
import java.util.zip.GZIPInputStream
import java.util.zip.GZIPOutputStream
import java.io._

object GzipHelper {

  implicit def StringGzipConvertor(str:String) = new {
    def toGzipBytes(charset:String="UTF-8") = compress(str,charset)
    def toGzipBytesString(charset:String="UTF-8") = new String(compress(str,charset).map(_.toChar))

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val a : Option[String] = Some("abc")

if(a.isEmpty)
  println("do something if a has value "+a.get)
else
  println("do something if a is empty")

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case class HttpRequest(path:String, queryStrings:Map[String,List[String]]) {
  def getPath() : String Or String = if(path.length>0) Good(path) else Bad("path cannot be empty.")
  def getQueryStrings() : ((List[String], Int), String) Or Every[String] = {
    validateKeyword(queryString.get("keyword")) zip validateNumber(queryString.get("number")) zip validateGender(queryString.get("gender"))
  }
  def validateKeyword(value:Option[List[String]]) : List[String] Or One[String] = {
    if(value.isDefined && value.get.length>0) Good(value.get) else Bad(One("No keyword."))
  }
  def validateNumber(value:Option[List[String]]) : Int Or One[String] = {
    try{

joecwu

Publish Artifacts to Sonatype Nexus Repository by using SBT

Install PGP plugin Reference

For sbt 0.13.5+: Add the following to your ~/.sbt/0.13/plugins/gpg.sbt file:

addSbtPlugin("com.jsuereth" % "sbt-pgp" % "1.0.0")

PGP Gen Key Reference

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case class InvalidArgumentException(msg:String) extends Exception(msg)

case class SearchUsersRequest(keyword: Option[String], userType: Option[Int], maxNum: Option[Int], returnFields: List[String]) {
  def getKeywork() = keyword | {throw InvalidArgumentException("keyword cannot be empyt.")}
  def getUserType() = {
    userType.map{ tp => (1 until 10 contains tp) ? tp | {throw InvalidArgumentException("userType must between 1 to 10.")}} |{ throw InvalidArgumentException("userType cannot be empyt.")}
  }
  def getMaxNum() = maxNum.getOrElse(10)
  def getReturnFields() = (returnFields.length > 0) ? returnFields | {throw InvalidArgumentException("must provide returnFields.")}
}