Logo

Who is talking?

Archive

Get up and running with OpenShift on AWS

20 days ago | Dave Kerr: dwmkerr.com

Setting up your own OpenShift cluster can be a little complex, but in this article I'll show you how to make it fairly painless.

WFFM: Save to Database

about 1 month ago | Sumit Bajaj: Sumit Bajaj's Blogs

Web Forms For Marketers has become one of the essential component of Sitecore. Almost every website is using forms to capture the inputs from users and it is very common scenario to get the data stored in Database for reporting purpose. Here are few easy steps which can help you storing the form's data in SQL database.Download the WFFM - SQL Provider(Save To Database) and install it in Sitecore using Installation wizard. All physical files and Sitecore items will be stored in respective location.Once installed, you will notice that it has created a new Action under System-> Modules -> Web Forms for Marketers -> Settings -> Actions -> Save ActionsNow, we have to add connection string in configuration file which will help us storing the data in that database. You have to keep the name of connectionstring to 'wfm' only as same name is referred in WFFM module code.< add connectionstring="user id=your_db_user_id;password=your_db_password;Data Source=your_db_server;Database=your_db_name" name="wfm" >You are done.Now add the 'Save to Database' action on any WFFM form and start using it. Also validate the database and data should start getting stored in it.Furthermore, this module provides the capability of exporting the saved data in CSV format. We can do customization on it to export the data from different servers(CMS or CD) which I will explain in next article.Please don't hesitate to contact me at 'email.bajaj@gmail.com' for any Sitecore related query/scenario.

Pointers in C and x86 Assembly Language

about 1 month ago | Pat Shaughnessy: Pat Shaughnessy

16GB of DDR random access memory my son used in his new gaming PC Recently I’ve been trying to learn how to read x86 assembly language. In http://patshaughnessy.net/2016/11/26/learning-to-read-x86-assembly-lang

Creating a Resilient Consul Cluster for Docker Microservice Discovery with Terraform and AWS

about 1 month ago | Dave Kerr: dwmkerr.com

In this article I'm going to show you how to create a resilient Consul cluster, using Terraform and AWS. We can use this cluster for microservice discovery and management. No prior knowledge of the technologies or patterns is required! The final code is at github.com/dwmkerr/terraform-consul-cluster. Note that

Learning to Read x86 Assembly Language

3 months ago | Pat Shaughnessy: Pat Shaughnessy

A 16-bit Intel 8086 microprocessor from 1978 (source: RodolfoNeres via Wikimedia Commons) Writing assembly language is

Using Slack for Server Development

3 months ago | Dave Kerr: dwmkerr.com

I recently found a surprisingly helpful approach for server-side development which uses Slack in a creative way.

Docker Registry with AWS & Let's Encrypt

3 months ago | Rocky Jaiswal: Still Learning

With pretty much all new projects moving to Docker and Docker managers like Kubernetes, the Docker Registry becomes the first piece of infrastructure that a team needs to setup. Sure there are public and private registries availa ...

Simple Continuous Integration for Docker Images

4 months ago | Dave Kerr: dwmkerr.com

In this article I'm going to demonstrate a few tips and tricks which can make your life easier when you are building or maintaining Dockerfiles. The need for a Build Pipeline Do we really need any kind of continuous integration or build pipeline for Dockerfiles? There will be cases when

Run Amazon DynamoDB locally with Docker

4 months ago | Dave Kerr: dwmkerr.com

tl;dr: Run DynamoDB locally using Docker: docker run -d -p 8000:8000 dwmkerr/dynamodb Try it out by opening the shell, localhost:8000/shell: DynamoDB Shell That's all there is to it! DynamoDB Amazon DynamoDB is a NoSQL database-as-a-service, which provides a flexible and convenient repository for your services. Building applications

Need a Second Opinion on Your Ruby Code? Ask Crystal

5 months ago | Pat Shaughnessy: Pat Shaughnessy

Running the Crystal compiler on your Ruby codeis like asking a second doctor for their opinion. When it comes to your health, you don’t hesitate to get a second opinion. Doctors don’t always agree, and a second doctor’s app

Hello Kubernetes

5 months ago | Rocky Jaiswal: Still Learning

Introduction Pretty much everyone in the technology world has heard about Kubernetes by now. But before we dive into it, let's try and understand the problems it solves - Back when I started programming, servers were usually considered out of reach for us developer ...

Effective Node.js Debugging

6 months ago | Dave Kerr: dwmkerr.com

If you are interested in improving your Node.js debugging skills, then check out my talk at the recent JSChannel 2016 conference in Bangalore: Comments and observations are always welcome!

My Writing Process

6 months ago | Daniel Higginbotham: Flying Machine Studios

The letter below is a response to an email from a Twitter friend. For context: I've written some instructional material that's enjoyed success online, including Clojure for the Brave and True and Clean Up Your Mess: A Guide to Visual Design for Everyone. Robert asked me a few questions about my process. Hi Robert! You're in the unfortunate position of being my permission to write at length about my creative process without seeming completely self indulgent: someone's actually interested in listening to me describe the chaos between my ears! Be prepared to read way more than you asked for. How do you decide who you are writing for? This one’s key for me. When I’ve written in the past, I’ve struggled with knowing how much or how little to say. I’m curious to learn how you deal with that. First: I've found it useful to follow the standard advice and pick an individual or two and write for them. The argument goes that you'll find it much easier to choose words and have a consistent tone, and that's proven true for me. When I wrote Clean Up Your Mess, I was one of three programmers working in an office full of charming people who did business analysis for management consultants, and I wrote the guide for a couple of them that I had become friends with. These analysts produced powerpoint decks by the barrel, and every single one was ugly. Similarly, Clojure for the Brave and True started as a guide for a couple coworkers that I was mentoring. However, picking your audience is only half the process. The other half is picking who the author is. I'm going to go on a bit of a tangent to explain this. When I started writing Clean Up Your Mess, my personal life was a mess. In hopes of making it less messy I had been spending most of my free time reading Buddhist literature and listening to lectures by Thich Nhat Hanh and Pema Chodron (in fact, my site opens with a Thich Nhat Hanh quote). I was spending a great deal of time meditating and reflecting. (You're interested in Buddhism too, right?) One of the ideas that really grabbed me was that our self-conceptions are just stories we tell ourselves with no reality to them. I won't belabor the point here; suffice to say that I found it useful and powerful to be able to perceive my identity as a construct as ephemeral as smoke. Around the same time, I started taking improv comedy classes, where I would spend two hours a week constantly coming up with new, unique characters and living in them for a few minutes at a time. When you're sold on the idea that your day-to-day you is itself just a character, improv becomes way easier and more fun. It's also fun to do this in real life - like, recently my wife and I were at the grocery store and I decided my character was "Super Excited About Carrots Guy", and I started shouting "OH MY GAWD JESS CARROTS! THEY HAVE CARROTS JESS! CARROTS!" Everyone was laughing as they escorted me out! Anyway, during this time of buddhism and improv I was writing Clean Up Your Mess and when I sat down to write I got to play with new identities, new characters, and see which was the most fun. It became much easier to find words and keep a consistent tone when I decided on the author's character. So, you mentioned not knowing how much or how little to write. Knowing your character helps. In Clojure for the Brave and True, one of my editors would sometimes whittle down sentences to the bone, leaving only pure information; I would undo those edits with gusto, adding back the shape and texture of the author's voice. There's another aspect of writing instructional material, which is that 95% of the time you can take more time to explain something. Even if you're writing for experienced audiences, at least take the time to explain acronyms and jargon. How often and how much do you write? Not enough and not enough! Writing was easiest, however, when I had a consistent schedule of writing at least one hour every single day. Let me tell you about my garage. My garage is a living f*cking nightmare. It's like Cthulhu and the dread of the dark you had as a child made disgusting love and produced a horde of horrors that died in giant filthy clumps all over. At the beginning of the year I suppressed my gag reflex long enough to clean it out with the goal of setting up a photo studio, which I did, only to let it sit for three months. So three months later I go in there to actually take photos and guess what: it's a complete horror show, again! If I had only spent time every day or even every week maintaining it, I'm sure it would have been much easier to keep clean. If I had cleaned it out, all those tiny insect monsters wouldn't have been able to breed, there wouldn't have been two dozen spider egg sacs, etc. When I don't write consistently it's like that. I have to crawl into the nest of no one cares what you write and this time everyone's going to hate it called my mind and clear it all out before I can actually start writing. When I write consistently, on the other hand, it's actually quite pleasant! One more note: much of the writing process is research. Every time I find myself struggling to explain something, it's because I don't understand it well enough. When that happens I put down the keyboard and pull out the pen and notebook. I try to articulate the questions that will lead me to understand what I want to explain. I read and I draw diagrams and play with words until I feel like I understand the concept. Becoming aware that, for me, writer's block is a lack of understanding, has helped me be much more productive. Collaboration Who does your drawings? My wife! She's pretty great. Do you have someone who edits for you? I did when I worked with No Starch. They were awesome! Clojure for the Brave and True is much, much better because they kept pushing me to write more clearly and explain things more fully. For other projects, I'll ask friends to look at drafts. How much does it cost? I paid my wife in carrots. OH MY GAWD JESS THEY HAVE CARROTS! No Starch gets 85% of hard copy sales and 77.5% of ebook sales (or something like that). I hope this was helpful!

Understanding Recursion

7 months ago | Daniel Higginbotham: Flying Machine Studios

During my Clojure training I've found that recursion routinely trips people up. It definitely tripped me up for a long time. I've tried to develop an explanation that's clear and intuitive, so if you're still scratching your head about recursion, read on! A classic recursion example is calculating n factorial, which is n multiplied by every natural number before n; 3 factorial is 6 (3 times 2 times 1), 4 factorial is 24, 5 factorial is 120. The code snippet that follows is a typical implementation of factorial; if you're reading this, then presumably it's confusing - which is great! It means that I haven't written this article for nothing. function factorial(n) { if (n == 1) { return n; } else { return n * factorial(n - 1); } } What makes this function recursive is that factorial calls itself. That's also what makes the function tricky; the function calls itself!? We're used to functions calling other functions to get work done. For example, this function uppercases a string and prepends "Yo, " to it: function yoShout(str){ return "Yo, " + str.toUpperCase(); } yoShout("gimme a donut"); // "Yo, GIMME A DONUT" In this tiny example, yoShout does its work by using the toUpperCase function. It's easier to understand than a recursive function because yoShout treats toUpperCase as a black-box abstraction. You don't have to tax your brain by loading toUpperCase's implementation details into your short-term memory. Let's re-write factorial to use function calls this way, with function's body calling another function in order to get its work done. To calculate 3 factorial, you could write a series of functions, factorial_1, factorial_2, and factorial_3, like this: function factorial_1() { return 1; } function factorial_2() { return 2 * factorial_1(); } function factorial_3() { return 3 * factorial_2(); } These functions feel safe and comfy. factorial_3 calls factorial_2, something we're completely familiar with, and likewise factorial_2 calls factorial_1. factorial_3 also does not care how factorial_2, just like in the string example. Unfortunately, these functions are also completely impractical; can you imagine writing factorial_1000? The recursive implementation doesn't have this problem. My suggestion is to try seeing the recursive implementation from the same perspective as the nonrecursive imiplementation. Here's the code again: function factorial(n) { if (n == 1) { return n; } else { return n * factorial(n - 1); } } You can look at this and say, "Oh, if n isn't 1, then this function does its work by calling some black-box function named factorial with the argument n - 1." You can look at the call to factorial(n - 1) as a call to a completely different function - one that just happens to have the same name and algorithm. That's it! I hope it helps. If you've been confused by recursion, I'd love to hear your feedback!

Pi Calculation with Elixir

8 months ago | Rocky Jaiswal: Still Learning

As a programmer one is always searching for better tools, practices and programming languages. For example, working with Clojure makes me a better programmer, it provides me the ability to write functional, succinct code that runs fast and works on the well-tuned and battle-tested JVM. Looking at ...

F#: Disabling SSL Certificate validation

9 months ago | Kristof Mattei: Kristof's blog

Yesterday I wanted to download some content off a website with F#, however unfortunately the certificate of the website was expired. let result = try let request = "https://somewebsite/with/expired/ssl/certificate/data.json?paramx=1&paramy=2" |> WebRequest.Create let response = request.GetResponse () // parse data let parsed = "..." Ok parsed with | ex -> Error ex If we execute this, … Continue reading "F#: Disabling SSL Certificate validation" The post F#: Disabling SSL Certificate validation appeared first on Kristof's blog.

F#: Disabling SSL Certificate validation

9 months ago | Kristof Mattei: Kristof's blog

Yesterday I wanted to download some content off a website with F#, however unfortunately the certificate of the website was expired. let result = try let request = "https://somewebsite/with/expired/ssl/certificate/data.json?paramx=1&paramy=2" |> WebRequest.Create let response = request.GetResponse () // parse data let parsed = "..." Ok parsed with | ex -> Error ex If we execute this, … Continue reading "F#: Disabling SSL Certificate validation" The post F#: Disabling SSL Certificate validation appeared first on Kristof's blog.

HTTP Compression and Performance tuning

9 months ago | Sumit Bajaj: Sumit Bajaj's Blogs

With the advancement of technology and exceeding expectations of users, one has to be very careful designing a website. Performance is one of the key elements for success of an application. Even if, you have designed the application with uttermost care and rock solid architecture, there are few key areas in which you have to be really vigilant. HTTP Compression is one of those pivotal spaces.HTTP compression is the technique to compress static and dynamic content which improves the transfer speed and performance of a website.Steps to keep the compression ON for a website. Here the demonstration is given for IIS based website.1. Open IIS (inetmgr)2. Goto website. Right side will show all components of that website3. Click on 'Compression' module and verify that both the checkboxes are checked if you need static and dynamic content to be compressed.4. Click 'Mime Types' and check 'application/x-javascript' is added in the existing mime types. If not, add it.5. Reset IIS, browse website and verify that JS is getting compressed now.Web.Config SettingsHere are all the mime types and gzip information which should exist for a website if compression needed, either in IIS settings or in web.config.Note: Include it in web.config if configuration file also get deployed with every build.Section to include in <system.webserver></system.webserver><system.webServer><httpCompression> <staticTypes> <add mimeType="text/*" enabled="true" /> <add mimeType="message/*" enabled="true" /> <add mimeType="application/javascript" enabled="true" /> <add mimeType="application/x-javascript" enabled="true" /> <add mimeType="image/jpeg" enabled="true" /> <add mimeType="*/*" enabled="false" /> </staticTypes> <dynamicTypes> <add mimeType="text/*" enabled="true" /> <add mimeType="message/*" enabled="true" /> <add mimeType="application/javascript" enabled="true" /> <add mimeType="application/x-javascript" enabled="true" /> <add mimeType="image/jpeg" enabled="true" /> <add mimeType="*/*" enabled="false" /> </dynamicTypes> <scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll" dynamicCompressionLevel="4" /> </httpCompression></system.webServer>After compression is ON:Response header of a JS file being loaded in website. 'Content-Encoding: gzip' shows that it is compressed.Useful toolsThere are several webistes which can help you detect, if your website/CSS/JS is compressed or not. You should check css/js or website seperately to make sure that all static medias are compressed. One of the examples website is given here.Check CompressionFor further detail, you can contact me www.bajajsumit.com. Please share your feedback if you find the article useful.

Testing the Docker for Mac Beta

9 months ago | Dave Kerr: dwmkerr.com

I've finally had a chance to install the new Docker for Mac Beta and give it a whirl, here are my experience so far!

Is it worth persevering with Golang?

9 months ago | Dave Kerr: dwmkerr.com

After perhaps 10-20 hours of learning, coding and messing around, I'm wondering - is it worth persevering with Golang?

What's your Vim Name?

9 months ago | Dave Kerr: dwmkerr.com

I'm a few weeks into moving to Vim as my main editor, I've stopped crying and shaking mostly (at least about my editing ability). Now I'm wondering: what's your Vim name? And who's got the best one? As far as I can work out, my Vim name is: Replace everything

Quick Tip: Sending Newlines with cURL

10 months ago | Dave Kerr: dwmkerr.com

Yikes, this took far too long to figure out! I have a service which takes plain text multiline input and outputs an object for each line, something like this: Input Line 1 Line 2 Line 3 Output [ {line: "Line 1"}, {line: "Line 2"}, {line: "Line 3"} ] There's a bit more

Classes and patterns in Node.js

10 months ago | Rocky Jaiswal: Still Learning

This week we had the awesome Node.js 6.0.0 release! With the 6.0.0 release Node.js has 93% of the ES6 features implemented. In this short post we will look at few particularly interesting features including "classes in JavaScript", ...

Moving from React + Redux to Angular 2

10 months ago | Dave Kerr: dwmkerr.com

I'm going to share my experiences of experimenting in Angular 2, as someone who needs a pretty compelling reason to move away from React/Redux!

Learn Docker by building a Microservice

10 months ago | Dave Kerr: dwmkerr.com

If you are looking to get your hands dirty and learn all about Docker, then look no further!

Running dotnet on Linux

10 months ago | Sumit Bajaj: Sumit Bajaj's Blogs

Server: Linux, version SUSE 12To run dotnet code on Linux, the first and foremost task is to "Install Mono package on linux".Note: Mono is an open implementation of Microsoft's .Net framework, including compilers. It uses the same development libraries on Linux which are being used on Windows. Therefore, if you code and compiled some mono code on Linux,  it will work for Windows as well.      zypper is a package installation tool which is used in this scenario. If zypper is not available, check which package manager tool is installed on server. Furthermore, to verify if zypper is installed or not, type zypper on command line which will show all options if zypper is available on server else it will show 'command not found'.zypper ar -r http://download.opensuse.org/repositories/Mono/SLE_11_SP2/Mono.repoThe above command will download from mentioned URL in a new repository. Here 'ar' stands for 'add repo'.After adding it to repository, type 'zypper refresh' command, it will ask to install packages. Type the appropriate option and install the Mono packages.Once successful installation,       we are all set to run dotnet on linux server.Running first dotnet codeCreate a new test.cs file by typing following command.$cat>test.csNow open the file using any available editor. In this case it is 'vi' editor.vi test.csStarting writing the first dotnet code as shown below.      Information about 'vi' editor:Type 'i' to change it to insert mode.Type 'esc' to come out of insert mode.Type ':w' to write the file and save.Type ':q' to quit and come back to command line tool.       NOTE: If any exception appears like '!' is required to override the file. Type ":w!" to override the existing file and write the new text. OR Type ":q!" to override the existing file with new text and quit.C# code for 'test.cs':using System;namespace Test1{class Test1{static void Main(string[] args){Console.WriteLine("Hello World!!");}}}Once you have saved the file, its time to compile it. 'mcs' is command which is used for compiling the code.dev-server-linux-suse12:~ # mcs test.csAfter compilation is successfully completed, its time to run the application. As it is console project, '.exe' file will be created as output. 'mono' is the command used for running the test project.dev-server-linux-suse12:~ # mono test.exeHello World!!You are all set to run dotnet on Linux. Provide your valuable comments/suggestions.

Two Dumb Ruby Mistakes

11 months ago | Pat Shaughnessy: Pat Shaughnessy

Coding is like climbing: You need equipment that will catch you when you make a mistake. (source: Elke Wetzig via Wikimedia Commons)

Packer, Ansible and Docker

11 months ago | Rocky Jaiswal: Still Learning

A little while back we looked at an operational setup that can get us up and running with any simple application by using Docker and capistrano. What was missing was the setup of the machine itself, we do not want to ...

Timeless Programming Tools

11 months ago | Daniel Higginbotham: Flying Machine Studios

I've been programming professionally for a dozen years. Some of what I've learned is best forgotten (oh god, Cold Fusion), but there have been many tools, techniques, and concepts that continue to be useful every day. Here are mine; I'd love to hear what yours are so I can experience both the joy of discovery and regret for not learning about the tool earlier. Relational Algebra / SQL I feel lucky that, during my fourteenth summer, I apparently had no friends and so had nothing better to do than try and slog through a book on MySQL and the now-defunct mSQL. You can see from the reviews that the book "is sketchy, incomplete, and almost totally useless." But, it did introduce me to SQL and databases. Soon after, I learned relational algebra (the theory underlying RDBMSs) and that investment has been one of the best of my life. I can't count the number of times a LEFT OUTER JOIN has saved my bacon. Friends be damned! Learning relational algebra provided the foundation I needed to move easily from MySQL to Oracle and MS SQL Server when I joined EnterpriseCo, and in general knowing how to interact with databases without a framework or ORM helped me quickly advance career-wise. It's why, at 20, I was able to land a contract building a custom site for the city of Santa Fe, New Mexico, instead of just cobbling together Wordpress and Drupal plugins. If you come from Rails or some other framework that handles all the database interaction for you, one of the best things you can do for your career is to learn relational theory and SQL. Read a book by C. J. Date. The Unix Process Model Understanding Unix processes helped me understand what's actually happening when I run a program. It's also helped me understand what exactly a web server is and what I'm doing when I write a web application. The book Advanced Linux Programming has a chapter on processes for free online. Actually, the whole book is free. When you don't know about processes, programming is much harder and more mysterious. It's harder to understand performance, and it's harder to understand how programs interact with each other. If you ever feel a vague sense that you don't really get what's going when you run the apps you write, learning the process model will go a long way toward clearing things up. Regular Expressions Yeah, yeah, we've all heard the joke: "something something regular expressions, then you have two problems." Personally, I don't get it, because regular expressions are seriously badass. I remember going through O'Reilly's big fat regex book while I worked from 11pm till 7am as a night auditor at a hotel when I was 18, and being blown away at how powerful they are. To say that we programmers deal with text all the time is so obvious, it's not even worth saying. Regular expressions are an essential tool, and here's where you can learn to use them. Finite State Machines Regular expressions are built as finite state machines. Here's a great tutorial on FSMs showing how to actually build a regular expression. It's extremely cool! I think FSMs are covered in computer science 101, but since I only went to college for a year and even then I studied works written a couple millennia before before the computer revolution, I didn't actually learn about them until about six years ago. My colleagues and I were having trouble with a mobile app - we needed the initialization process to happen in a particular way, and the logic for ensuring that was getting pretty tangled. Once we took the time to learn about FSMs, though, it was easy to express the process as a series of states and transitions. I've since found that most tricky UI code can be improved this way. Just a couple months ago I was having trouble building a typeahead element from scratch with hoplon. Once I identified that the difficulty was in keeping track of all the possible states, it only took a few minutes drawing a state machine diagram and I was back on track. Emotion Management In my personal life I'm constantly learning about and practicing ways to manage emotions. This stems from both my personal aspiration to improve the lives of others and from the completely selfish reason that it helps me do good work. Emotion management is probably the most important meta-skill you can develop. I mean, emotions are at the core of who you are as a human being. The book Non-Violent Communication is an excellent resource for dealing with emotions. Also, my friend Alex Harms recently wrote a book specifically for technical people. Those are my programming power tools - I hope you find them useful!

Cannot alter the login 'sa', because it does not exist or you do not have permission.

11 months ago | Sumit Bajaj: Sumit Bajaj's Blogs

Working on projects, it can happen that 'sa' account gets locked. If it is on local machine OR development boxes, onus would be on you to fix it. If scripts and SQL steps are not working, this might help you fixing the issue.Steps to unlock 'sa' account and resetting the password.1. Open SQL Server Configuration Manager2. Select SQL Server Services -> 'SQL Server' service.3. Right click on 'SQL Server' service and click on "Startup Parameters". For 2008, server "Startup Parameters" are inside Advanced tab. 4. Add '-m' in startup parameters as shown above and click on 'Add'. This will put SQL server into 'Single User Mode' and local admin will have 'Super User' rights. For 2008, server you have to add ':-m' in the last of the existing query.5. Save the settings and Restart the service.6. Now open the SQL Server Management Studio and connect to database using 'Windows Authentication'.7. Goto Security -> sa -> Right click and open properties.8. Unlock the 'sa' account and reset the password.YOU ARE DONE!!**Important: Now to switch back to 'Mixed User Mode' where you can access the database using 'sa' account, remove the '-m' from 'Startup Parameters' which we added in above steps.

Brave Clojure: Become a Better Programmer

11 months ago | Daniel Higginbotham: Flying Machine Studios

Next week week I'm re-launching www.braveclojure.com as Brave Clojure. The site will continue featuring Clojure for the Brave and True, but I'm expanding its scope a bit. Instead of just housing the book, the purpose of the site will be to help you and the people you cherish become better programmers. Like many other Clojurists, I fell in love with the language because learning it made me a better programmer. I started learning it because I was a bit bored and burnt out on the languages and tools I had been using. Ruby, Javascript, Objective-C weren't radically different from each other, and after using them for many years I felt like I was stagnating. But Clojure, with its radically different approach to computation (and those exotic parentheses) drew me out of my programming funk and made it fun to code again. It gave me new tools for thinking about software, and a concomitant feeling that I had an unfair advantage over my colleagues. So of course the subtitle of Clojure for the Brave and True is learn the ultimate language and become a better programmer. And, four years since I first encountered Rich Hickey's fractal hair, I still find Clojure to be an exceptional tool for becoming a better programmer. This is because Clojure is a fantastic tool for exploring programming concepts, and the talented community has created exceptional libraries for such diverse approaches as forward-chaining rules engines and constraint programming and logic programming, just to name a few. By learning a variety of programming concepts, you become a better programmer because you're better able to recognize what kind of problem you're working on and apply the right tools. To give just one example: when I'm working on complex UI widgets my work is always made easier if I model the widget using a finite state machine (FSM) - but I had to actually spend time learning what FSMs are and how to use them (those of you with comp sci degrees are probably chuckling at this). You may have started learning Clojure because you heard that functional programming, Lisp, and immutability can make your life easier, but the fun doesn't stop there! At Brave Clojure, I hope you'll continue using the ultimate language to explore the vast and infinitely fascinating world of computer programming with me. The first topic we'll explore is parallel programming. Here's the beginning of an ebook on the topic that I'm nearly finished with: Yes, it would be fair for you to describe my startup as the Google of palm reading. I don't know if you know this, but the fortune telling industry has no quality control standards. There is no Six Sigma of fortune telling. Sometimes it seems like these people are just making things up! We can do better. Did I say we? Yes! I want to you to embark on this startup journey with me. Lucky you! My - our - plan is to disrupt the field with an app that lets a user position their phone so that the camera faces their palm and takes a picture, then predicts the future. I call it: iFacePalm. And, uh, there's parallel programming in it. While I plan on spending most of my time helping you and all of your closest friends, enemies, and even frenemies become better programmers by writing about these big ideas, I'm also going to spend time covering practical Clojure topics like deployment and debugging. To make this happen, I'm working a (great) job only two days a week and spending the rest of the time on Brave Clojure, so I'll need to find a way to derive income from the site. I'm not sure yet what will be free and what won't. My dream is to make all the content available online for free. That's what gives me joy, and I think it's the best way to have a positive impact. Ideally, I would be supported in this endeavor through monthly donations, but I'll likely try different approaches over time. Finally, I've been putting together two sites to help you up your game: Open Source Clojure Projects, a directory of active projects, and Clojure Work, the first Clojure-only job board. The latter is still in beta, and I'm going to officially release it and move it to https://jobs.braveclojure.com next week. The best way to get better at Clojure is to actually write Clojure, and working on real projects (and even getting paid to do so) is a great way to do that. Companies who buy job board ads will also be supporting me in making more content - hooray! If you get excited about learning more programming ideas, or learning to develop Clojure programs better, or getting paid cold hard cash to write your favorite language, then I cordially invite you to consider signing up for my newsletter, where I'll announce every release: Writing Clojure for the Brave and True was one of the most rewarding experiences of my life in large part because I got to interact with so many kind, thoughtful, intelligent people. I look forward to your company as I embark on this new chapter of my journey!

A Directory of Open Source Clojure Projects

11 months ago | Daniel Higginbotham: Flying Machine Studios

Every now and again I'll come across a post where someone asks about getting involved in open source clojure projects. Because every question deserves a single-page app dedicated to its answer, I made Open Source Clojure Projects, a directory of active projects welcoming new contributors. Each project has (or should have) clear instructions on: Developing the project locally Running tests if there are tests Contributing code (pull request? tests required?) Contacting other devs - slack, mailing list, IRC, etc Also, there's a "beginner-friendly" flag so that new Clojurists can easily find projects with tasks that are appropriate for their skill level. So far, 22 projects have been added, which is awesome. A random sampling: milestones, which generates the best possible schedule from a set of tasks reverie, a CMS for power users Scheje, a little Scheme on Top of Clojure (!!!) system, a friendly layer on top of Stuart Sierra's component library If you have an open source project and want people to contribute, please add it! The Stack A few folks have asked me about what tools I used to create the site. I'll explain more below but briefly: The backend is a weird, unholy mess of fantastic classic libraries and sideshow code that I keep transplanting from one project to another so that I can answer the question what kind of abomination will this morph into this time?. The backend uses Github as a database, though, and that's pretty neat. The frontend uses re-frame and includes some form handling code that I'm proud of and that's actually worth stealing. Finally, there's also some code for deploying with Ansible that's worth stealing. In the time-honored fashion of technical blog posts everywhere, I'll now "dive in" and elaborate on each of those bullet points. Backend For the backend, the site uses ring, compojure, liberator, http-kit, and the weird set of tools that have accreted in my projects over the years. Even though the code footprint for the backend is pretty small, it's pretty idiosyncratic, containing handfuls of half-formed ideas I keep noodling around with. Hopefully someday soon I'll be able to really nail down my approach to backend dev and share it, because it does allow me to write apps quickly. One cool part of the site is that it uses a Github repo, Open Source Projects, as its database. Browse the projects directory and you can see every project that's listed on the site stored as an EDN file. When the backend starts up it reads from Github, and whenever someone posts or edits a listing it writes the EDN file using Github's API. The nice thing about this approach is that I didn't have to worry about standing up a server or keeping backups. And it was just fun to code. Here's the source for using Github as a db - I definitely see potential in reusing this approach for similar lightweight directory sites. Frontend re-frame has a delightful README that gracefully introduces you to reactive programming. If you haven't read it then stop reading this article and read that instead; I am 100% confident that it's a better use of your time. re-frame is a joy to use, and it's become my go-to tool for frontend projects. I've written a fair amount of code for working with forms and submitting values. This code forms a kind of nano-framework on top of re-frame, and it's allowed me to speed up the development process from project to project. Here's an example form which uses the form helpers. If you'd like for me to write a detailed explanation of this code, please leave a comment letting me know :) Boot deserves a special mention because it makes it so easy to develop ClojureScript apps. With Boot you get live reload (every time you change your frontend files, the changes are automatically injected into the browser), giving you a near-instantaneous feedback cycle that makes development much more enjoyable. It's also easy to incorporate Sass compilation - and your Sass files also get the live reload treatment. If you're not using Boot to build your ClojureScript app then chances are you're causing yourself undue suffering. And hey, maybe you're into that? No judgment. But if you're not, then take the time to learn it - it's a great investment in yourself as a Clojure developer. Deployment The infrastructure directory contains scripts for provisioning and deploying to a server with Ansible. It also has a Vagrantfile so that you can stand up a test server locally; just run vagrant up to both create the virtual machine and provision it. To deploy, cd into the infrastructure directory and run ./build.sh && ./deploy-dev.sh. Those two shell scripts are extemely simple, so take a look at them to see what's involved in deployment. The Ansible configuration is almost completely reusable. You can check it out in infrastructure/ansible. The roles directory in particular has Ansible tasks for creating an nginx server that can run Clojure app. It also includes an Upstart script for controlling startup/shutdown of your Clojure app (assuming you use Ubuntu). The Future Eventually, I'd like to add more tools for project discovery and for showing project stats. @yogthos, for example, suggested incorporating a project's stats from github so that users can see how active and popular each project is, information that can help them decide which project to contribute to. Also, I'm in the process of revamping braveclojure.com to include more resources for Clojure programmers. The site hovers around 3rd or 4th Google result for "Clojure", just below clojure.org and the Wikipedia entry. So, it's kind of popular I guess. My hope is that by featuring Open Source Clojure Projects, I'll help more new developers get involved and also help project maintainers squash some tickets.

hapi.js, JWT and CORS

11 months ago | Rocky Jaiswal: Still Learning

In the last post we setup a React based authentication workflow for a sample application. In this short post we will look at a hapi.js backend that can handle authentication using http://jw ...

Authentication workflow with React

12 months ago | Rocky Jaiswal: Still Learning

Having worked with a few frontend frameworks, I definitely find React to be a very good choice. For me, it delivers on the promise of creating clean frontend components that can be used across projects while being easily extensible and flexible. On t ...

Not a Superpredator

12 months ago | Daniel Higginbotham: Flying Machine Studios

I'm the son of a Vietnamese emigrant. I grew up in the South, where I experienced and witnessed racism. I have black step-siblings and my wife is black (naturally, so are my in-laws). As such, I try to educate myself about race issues in America. I don't share my thoughts much publicly but do want to write more on the subject. In the mean time, here's a (slight edited) exchange I had with a friend on Facebook about a recent event, Ashley Williams's protest during a Hillary Clinton speech. Me: A room full of white people at a $500/person Hillary Clinton event tells young black woman she's being rude and inappropriate for demanding Hillary Clinton explain why she supported the system that destroyed countless black and latino lives. I think that accurately sums up the prevailing attitude toward race in America: black people, please don't cause me mild discomfort by bringing my attention to our society's racial caste system. It's impolite. Friend: Wow. This thing seems like... a really, really huge distortion. She [Hillary] actually said: "You’re the first person to do that, **and I’m happy to address it."** She offered to talk about it. But the demonstrator wasn't there to talk, and wasn't in listening mode. Second, what she said, 20 years ago, is that she thought 'SuperPredators' exist and should be dealt with. It was a popular idea at the time. She did not say that they were one color or another: just that they exist and should be contained. WTF ??? It's indisputable that America needs to deal with the legacy of excessive force and excessive incarceration against people of color. But if we make it sound like any talk about incarcerating anybody, ever, must be inherently racist... we've already lost the battle to have serious conversations about what non-racially-biased policing would look like. Me: Hey man! Thanks for sharing your thoughts. Here are more of mine, and I hope they don't come across as combative - I really appreciate getting to talk about this stuff with someone as thoughtful as you. I wasn't actually commenting on Hillary's reaction, but the reactions of those in the (almost entirely white) room with her: people hissing at her and telling her she's being rude and inappropriate. That's what I'm referring to when I say the video reflects the prevailing attitude toward race. To me, it's as if the message toward the BLM activist [note: I've since learned she actually isn't with Black Lives Matter] is, "Excuse me, but you're interrupting the event we paid $500 to see. Please take your complaints about the racial caste system, which doesn't negatively affect me, elsewhere." And it is always "rude" or "inappropriate" or "inconvenient" for those topics to be discussed. When Beyonce dances at the Super Bowl, people lose their minds: they're just trying to enjoy football, they don't want to have to think about the lives of people who aren't like them! When another black man or woman gets murdered by police and people take to the streets demanding change, they're somehow offensive and ungrateful for criticizing law enforcement. Most often, the reaction is to denounce the method and ignore the message. Last year, Bernie Sanders visited Liberty University, and David Nasser, a university VP, got some of the biggest applause of the event for saying that the problem with the criminal justice system is a "sin issue, not a skin issue" - meaning that it was not a political issue, but one better addressed by encouraging people to be better or something. Same message: stop speaking up, black people. So that's what I was meaning to communicate originally. Here are my thoughts on Hillary. I'm not sure if you're familiar with "dog-whistle" politics, using coded language to court the racist vote. At the time, the Democratic party was trying to win back the vote of poor, Southern whites who'd switched to the Republican party thanks to the republicans' Southern Strategy, an effort to win those votes by appealing to racist fears and biases. Anyway, Democrats had the idea, "hey maybe if we also play on those racial fears, we'll get those votes back!" And that's what they did. When Hillary and other political/media figures talked about "superpredators", it was generally understood to mean "urban" people, and that was generally understood to mean black people. So when the demonstrator brings this up, she's not saying that "any talk about incarcerating anybody, ever" is inherently racist. She had reasons for singling out that phrase and using it to call attention to Hillary's record. Some might disagree, but I think her reasons were good ones. And even if "superpredator" wasn't meant that way, the result was still the crushingly unjust system we have today - and Hillary's support helped build that system. Using terms like "superpredator" and "bring them to heel" to accidentally perpetuate a racial caste system might even be worse. Michelle Alexander, author of The New Jim Crow, writes about it persuasively. The New Jim Crow goes into even greater detail about how mass incarceration and the criminal justice system are tools for racial control, even if many of the actors in the system (police, lawyers) aren't racist. I'm a Bernie fan, and I don't have rabid Hillary hatred. If it comes down to Hillary versus whichever clown the Republican party decides on, I will vote for Hillary. I respect her vast experience and think she would do a decent job at pushing for progress. When it comes to racial justice, though, I think Bernie has a much better record. Most of all, I'm an Ashley Williams fan. It takes courage to do what she did. Maybe she wasn't in listening mode (it's hard for me to really articulate my thoughts on this. She did give a good pause so that HC could speak. And anyway the power was so asymetrical that I don't know how to think about it. How do you really try to talk when you're being carted off by security?). But I'm glad she did it - it brought attention to an under-reported problem, and Hillary did in fact end up apologizing. And no damage was done, except perhaps to the sense of propriety of a few stuffy rich people.

Setting up web server and continuous integration

about 1 year ago | Sumit Bajaj: Sumit Bajaj's Blogs

Apart from creating website & app-pool in IIS, there are several steps which need to be performed when setting a new website on server.Setup Web ServerThere are few activities which you have to perform on Web Server:1. Install Web Deploy [Download]2. Install URL Rewrite [Download]3. Make Sure .Net Framework feature is ON in Windows features4. Create a standard user which could be used to deploy files to web server after successful build5. Open "services.msc" and check that 'Web Deployment Agent Service' is running with the standard user credentials created in Step 4.6. Run App pool and website with same standard user which is created in Step 47. Reset IIS ServerContinuous IntegrationThere are several tools which are being used for continuous integration but they perform same functions when we discuss about build and deployment. In this example, we are referring Jenkins [Download].If msdeploy or any relevant command is being used to deploy files on web server, same standard user credentials should be used to copy the content else it will throw unauthorized exception.Common ExceptionsAn item with the same key has already been added.Solution: It can be resolved by checking Mime types. There is a probability that same Mime type is being added by web.config which is there in IIS already. In IIS 8, there is not need to add Mime types manually.Website is appearing but css/font is not loading.Solution: Open dev tools(if its chrome browser, press F12 key) and check if in console you are getting errors like 404, 500 etc. Check if css/font files are present in the right folder. If gulp or grunt is being used, make sure it is compiling the files without exception.If any CMS is being used then there might be CMS related errors.Sitecore has no necessary permissions for reading/creating counters. OR Sitecore publishing screen is showing 'Initializing' but not publishing anything.Solution: Application pool user should be member of 'Performance Monitor User' group. Add user to this group and restart IIS. Even after this, if it does not work sitecore counter can be disabled by setting counter value to false. For example: <setting name"counters.enabled" value-"false"/>Let me know if you still get any exception. Have a nice day!!

Is Your Postgres Query Starved for Memory?

about 1 year ago | Pat Shaughnessy: Pat Shaughnessy

Like a patient with low blood pressure, a slow SQL query might not be getting the memory it needs. For years or even decades, I’ve heard about how important it is to optimize my SQL statements and database schema.

Get all Items inheriting another template

about 1 year ago | Sumit Bajaj: Sumit Bajaj's Blogs

Working on different templates and Sitecore items, its very common requirement to knowhow many items are created with a specific templatehow many template are inheriting a base template or another templateSitecore provide this feature out of box however you need to write query to fetch the required items.Open Sitecore IDE (http://localhost/sitecore/shell/default.aspx?xmlcontrol=IDE)Goto Tools -> XPath BuilderWrite XPath Expression:/sitecore/templates//*[contains(@__Base template,'{1FE1328B-375B-4548-A53E-344FA61ACC90}')]In result section, it should show all templates which are inheriting base template with ID {1FE1328B-375B-4548-A53E-344FA61ACC90}.Similarly, query /sitecore/content//*[@@templatename='Promotional Page'] should show all pages (under content) created with 'Promotional Page' template.On top of results, it shows the count of items and time taken to fetch the items.We can use fast query as well instead of query.Note: The above queries are example of specific requirement. Query can be modified to get required items according to project need.URL: Sitecore Query and Fast Query

Weather with Reagent

about 1 year ago | Rocky Jaiswal: Still Learning

In my last blog I talked a bit about React and ClojureScript. In this post we will look at a simple Reagent app that fetches the weather using the http://openweathermap. ...

React Router Comparison

about 1 year ago | Rocky Jaiswal: Still Learning

React and Redux are game changing technologies. The architecture principles they are based on seem to be sensible and rock solid. Redux architecture revolves around a strict unidirectional data flow, with a central ...