lucianenache

First verify the version of Java being used is not Sun Java 8 SDK

java -version

Get the Sun Java 8 SDK from Oracle

wget --no-cookies --header "Cookie: gpw_e24=xxx; oraclelicense=accept-securebackup-cookie;" "http://download.oracle.com/otn-pub/java/jdk/8u11-b12/jdk-8u11-linux-x64.rpm"

Install Sun Java 8

sudo rpm -i jdk-8u11-linux-x64.rpm

Check if the default java version is set to Sun Java 8 SDK

lucianenache

Get Git log in JSON format

git log --pretty=format:'{%n  "commit": "%H",%n  "abbreviated_commit": "%h",%n  "tree": "%T",%n  "abbreviated_tree": "%t",%n  "parent": "%P",%n  "abbreviated_parent": "%p",%n  "refs": "%D",%n  "encoding": "%e",%n  "subject": "%s",%n  "sanitized_subject_line": "%f",%n  "body": "%b",%n  "commit_notes": "%N",%n  "verification_flag": "%G?",%n  "signer": "%GS",%n  "signer_key": "%GK",%n  "author": {%n    "name": "%aN",%n    "email": "%aE",%n    "date": "%aD"%n  },%n  "commiter": {%n    "name": "%cN",%n    "email": "%cE",%n    "date": "%cD"%n  }%n},'

The only information that aren't fetched are:

• %B: raw body (unwrapped subject and body)
• %GG: raw verification message from GPG for a signed commit

lucianenache

//////////////////////////////////////////// Option ////////////////////////////////////////////////////////////////////////
obj.fold(defaultVal)(func)
obj.map(func).getOrElse(defaultVal)
obj match {
    case Some(x) => func(x); 
    case None => defaultVal
}

// composed Option[A]
val oa: Option[String] = Some("a")

lucianenache

Keybase proof

I hereby claim:

• I am lucianenache on github.
• I am lucian_enache (https://keybase.io/lucian_enache) on keybase.
• I have a public key whose fingerprint is E349 CC65 D191 930C D888 F808 CCAD 6783 8C82 C1EB

To claim this, I am signing this object:

lucianenache

/* proof of concept for non atomic method */
/* to fix this the call should be wrapped */
/* inside a synchronized block */

private var uidCount = 0L

def getUniqueId(): Long = {
 uidCount = uidCount + 1
 uidCount
}

lucianenache

package akka.http.scaladsl

import java.io.File

import akka.http.scaladsl.unmarshalling.Unmarshal
import akka.util.ByteString

import scala.concurrent.duration._

import akka.actor.ActorSystem

lucianenache

// The collect method takes a PartialFunction as argument and maps the 
// values defined for this partial function over it, skipping those
// outside the definition domain. 

// Given a partial function pf, the following code:
//
// val pf: PartialFunction[A, B] = 
// coll.collect(pf)
//
// is roughly equivalent to

lucianenache

Latency Comparison Numbers
--------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

lucianenache

#include "WiFi.h"
#include "ESPAsyncWebServer.h"
int analogPin = A0;

const char* ssid = "SOME_SSID";
const char* passwd = "SOME_PASSWD";

AsyncWebServer server(80);

float readTemp() {

lucianenache

/* Procedural endpoint */
@GetMapping("/users/{id}")
ResponseEntity<User> get(@PathVariable long id) {
  User user = repository.findById(id);
  if(user != null) {
    return ok(user);
  } else {
    return notFound();
  }
}