I’ve created a very simple Raspberry Pi project that I use to let my kid know if its daytime or nighttime. When I say goodnight and leave my kids bedroom, I trigger a simple script on my Raspberry Pi with a 7″ touchscreen attached. The screen will display a daytime image for a few minutes, before switching to a nighttime image. The nighttime image is an indication for my kid to put down her toys and go to bed. Over…
One of our node.js applications at work was designed to call an internal rest service, cache the whole response, and iterate over the data to separate relevant data from non-relevant data, and write the relevant data to file. To speed things up a bit, we wanted to process, filter and write the data to file as it arrived. For this task, the excellent Javascript library “Oboe” came in handy:
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 |
var oboe = require('oboe'); var fs = require('fs'); var jsonFileStream = fs.createWriteStream('myfile.json')[...] var acceptHeader = { Accept: 'application/json' } var requestHeader = { url: "http://rest.example.local/myapp", headers: acceptHeader } oboe(requestHeader) .node('{ref hostname}', function(item) { handleItem(node, write_item_to_file); }) .done(function() { jsonFileStream.end(); }); function handleItem(item, callback) { if (isInterestingData(item)) { callback(item); } } function isInterestingData(item) {...} function write_item_to_file(item) {...} |
Keywords: HTTP response streaming
Say you want to have Maven handle the dependencies for your java application containing the well known “public static void main” method. Create a Maven project, put your MyApplication.java file under the “src”-folder, and add something like this to you pom.xml:
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 |
<?xml version="1.0" encoding="UTF-8"?> <build> <sourceDirectory>src</sourceDirectory> <resources> <resource> <directory>src</directory> <excludes> <exclude>**/*.java</exclude> </excludes> </resource> </resources> <plugins> <plugin> <artifactId>maven-compiler-plugin</artifactId> <version>3.1</version> <configuration> <source>1.7</source> <target>1.7</target> </configuration> </plugin> <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>exec-maven-plugin</artifactId> <version>1.3.2</version> <executions> <execution> <goals> <goal>java</goal> </goals> </execution> </executions> <configuration> <includePluginDependencies>true</includePluginDependencies> <executable>java</executable> <mainClass>MyApplication</mainClass> </configuration> </plugin> </plugins> </build> |
Now you can run your application using the exec-maven-plugin, like this:
|
1 |
mvn clean compile exec:java -Dexec.args="arg1 arg2 arg3" |
For å lære meg litt om Android-programmering jeg har laget en enkel app. App’en er svært enkel, og har som eneste formål å vise sanntidsinfo for din neste reise med buss, bane, tog, trikk eller båt. Utgangspunktet mitt var at jeg enkelt ønsket å finne ut om jeg måtte løpe til bussen eller ikke, for jeg har altfor mange ganger løpt til bussen tidlig om morgenn, for så å bli stående å vente på den fordi den er forsinket.
As file system backups might fail to backup open files, it’s good practice to close any open files before running the backup. Closing a MySQL database file means you will have to stop the MySQL server itself, causing causing a database outage while the backup is running. But fortunately there’s a smarter way to backup you database – simple dump the entire database to a file (which is automatically closed when the dump is completed), and have your file system…
Sublime Text makes a great IDE for node.js development. First, install the node.js software and get your initial project up and running. Various tutorials on the web should get you going. When it’s time to run your app, configure the Sublime Text build system to build it and run it. To avoid having to start and stop your Node server manually, make use of the tool Nodemon – this tool will build and run your app automatically when you edit…
My site is running WordPress, which store data in a mysql database. As part of my backup procedure, I backup the database as well as the WordPress files. For fun I thought I’d inspect the actual contents of the database, and in case others wish to do the same here’s how to go about it.
Det er mange som bruker samme passordet sitt mange steder på nettet, meg selv inkludert. Har opp gjennom årene registrert meg utallige steder, men har ikke laget unikt passord for hvert sted. Men passordet til mailen er unikt, og brukes ingen andre steder. Hvorfor?
I recently installed Xubunut 11.04 on an old notebook laptop, and wanted to run a dual monitor setup using an external monitor. The laptop ships with Intel Graphics Media Accelerator 900, and I’m using this display controller:
|
1 2 |
kenneho@laptop:~$ lspci |grep Display 00:02.1 Display controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 04) |
My external monitor is running with a 1280×1024 resolution, and are placed on the left hand side of the laptop.
At work we have a few scripts that we would like to monitor, and define a few messages that should trigger an SMS to be sent to the person on call. As most of these scripts log to syslog, and we have a our linux servers set up to forward syslog messages to a central log host, we going to monitor the central syslog for important messages originated by the scripts. In order to avoid message storms, however, we need…