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Xiaojun Ren nicholasren

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View range_of.py
#!/usr/bin/env python
# range_of.py 10.0.0.0/8
import sys
# Get address string and CIDR string from command line
(addrString, cidrString) = sys.argv[1].split('/')
# Split address into octets and turn CIDR into int
addr = addrString.split('.')
View push_daemon_v1.java
package com.thoughtworks;
import org.apache.http.HttpEntity;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClients;
import java.io.IOException;
import java.lang.String;
@nicholasren
nicholasren / realtime-searching.scala
Created Oct 13, 2014
a small example of real time indexing and searching engine
View realtime-searching.scala
package actors
import akka.actor._
import scala.concurrent.{Future, ExecutionContext}
import scala.concurrent.duration._
import ExecutionContext.Implicits.global
import java.io.{PrintWriter, FileOutputStream}
import rx.lang.scala.Observable
import rx.lang.scala.Observable._
@nicholasren
nicholasren / Duplication.java
Last active Sep 6, 2018
java clean code examples
View Duplication.java
import java.util.Arrays;
import java.util.List;
import java.util.function.BinaryOperator;
public class Duplication {
public static void main(String[] args) {
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);
Integer product = Math2.sum(numbers);
System.out.println(product);
}
@nicholasren
nicholasren / duck-typeing.scala
Created May 20, 2014
scala training example - structural types
View duck-typeing.scala
trait Quack {
this: { def quack(): Unit } =>
}
class Duck extends Quack {
def quack() = {
println("Quack, Quack...")
}
}
@nicholasren
nicholasren / biz-logic-in.java
Last active Aug 29, 2015
scala training example - monad
View biz-logic-in.java
//in post controller
User user = null;
try {
user = userService.findById(userId)
} catch (UserNotFoundException e) {
throw //handling exception
}
@nicholasren
nicholasren / pattern-matching.scala
Created May 19, 2014
scala training example - pattern matching
View pattern-matching.scala
case class Option[T]
case class Some(t: T) extends Option[T]
case class None extends Option[T]
val possibleNumber = Some(1)
val numbers = possibleNumber match {
case Some(x) => x
case None => 0
}
@nicholasren
nicholasren / function-composition.scala
Last active Aug 29, 2015
scala training example- function composition
View function-composition.scala
val userFetcher: String => User = {
//...
}
val commentFetcher: User => List[Comment] = {
//...
}
val userCommentFetcher : String => List[Comment] = userFetcher andThen commentFetcher
@nicholasren
nicholasren / high-order-function.scala
Last active Aug 29, 2015
scala the language matters training
View high-order-function.scala
//-------------------------------------//
// readFile is a high order function //
// which can take another function //
// as parameter //
//-------------------------------------//
def using[T](f: File)(handler: FileInputStream => T): T = {
val resource = new java.io.FileInputStream(f)
try {
handler(resource)
@nicholasren
nicholasren / function-as-first-class-citizen.java
Created May 19, 2014
scala the language matters training
View function-as-first-class-citizen.java
//-------------------------------------------//
// function as parameter java implementation //
//-------------------------------------------//
class UerFetcher implement Callable<User> {
private String userId;
@Autowired
private UserService userService;
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