Standalone Selenium Driver Log Level

Standalone Selenium Driver Log Level

I had too much trouble today trying to minimise selenium driver logs, only to find out you only need to pass environment option upon starting selenium just like below. Just sharing this one for others sake. :)

# Log levels are the following to choose from: OFF, SEVERE, WARNING, INFO, DEBUG, FINE, FINER, FINEST, ALL

java -jar -Dselenium.LOGGER.level=WARNING /opt/selenium/selenium-server-standalone.jar

You can also set log file like:

java -jar -Dselenium.LOGGER=/tmp/my_file.log /opt/selenium/selenium-server-standalone.jar

You can do more experiments if needed. Play around. Enjoy!

Angular variable with HTML containing directives compiled via custom directive

This is a code snippet that allows one to compile a scope variable value who contains both HTML and angular directives.

Simple way to deal with it is through this script...

On html:

<div ng-bind-html-compile="someVariable"></div>

On angular controller:

$scope.personName="Mark";
$scope.someVariable="<b>Hello, </b> {{personName}} !!!";

On angular directive:

app.directive('ngBindHtmlCompile', ['$compile', function ($compile) {
    return {
        restrict: 'A',
        link: function (scope, element, attrs) {
            scope.$watch(function () {
                return scope.$eval(attrs.bindHtmlCompile);
            }, function (value) {
                element.html(value && value.toString());
                var compileScope = scope;
                if (attrs.bindHtmlScope) {
                    compileScope = scope.$eval(attrs.bindHtmlScope);
                }
                $compile(element.contents())(compileScope);
            });
        }
    };
}]);

Java - Finding Frequent Phrases in a Large File Effeciently

October 15, 2015 - I was bored so I went to play around with Java and solve some simple problem or exercise below to energize my playful mind.

Given a large file that does not fit in memory (say 10GB), find the top 100000 most frequent phrases. The file has 50 phrases per line separated by a pipe (|). Assume that the phrases do not contain pipe.

Example line may look like: 

Foobar Candy | Olympics 2012 | PGA | CNET | Microsoft Bing ….

The above line has 5 phrases in visible region.

Java - Finding K-complementary Pairs in Array of Integers

October 15, 2015 - I was bored so I went to play around with Java and solve some simple problem or exercise below to energize my playful mind.

Write an efficient algorithm to find K-complementary pairs in a given array of integers. Given Array A, pair (i, j) is K- complementary if K = A[i] + A[j];

Java - Check if a String is a Palindrome

October 15, 2015 - I was bored so I went to play around with Java and solve some simple problem or exercise below to energize my playful mind.

Write an efficient algorithm to check if a string is a palindrome. A string is a palindrome if the string matches the reverse of string.

Example: 1221 is a palindrome but not 1121.

MySQL - Overlapping Date Range Filter

October 15, 2015 - I was bored so I went to play around with MySQL and solve some simple problem or exercise below to energize my playful mind.

I have a table for bugs from a bug tracking software; let’s call the table “bugs”. The table has four columns (id, open_date, close_date, severity). On any given day a bug is open if the open_date is on or before that day and close_date is after that day. For example, a bug is open on “2012-01-01”, if it’s created on or before “2012-01-01” and closed on or after “2012-01-02”. I want a SQL to show number of bugs open for a range of dates.

CREATE TABLE bugs (
  id INT,
  severity INT,
  open_date DATE,
  close_date DATE
);

INSERT INTO bugs VALUES
  (
    1, 1,
    STR_TO_DATE('2011-12-31', '%Y-%m-%d'),
    STR_TO_DATE('2011-12-31', '%Y-%m-%d')
  ),
  (
    2, 1,
    STR_TO_DATE('2012-01-01', '%Y-%m-%d'),
    STR_TO_DATE('2012-01-02', '%Y-%m-%d')
  ),
  (
    3, 1,
    STR_TO_DATE('2012-01-03', '%Y-%m-%d'),
    STR_TO_DATE('2012-01-03', '%Y-%m-%d')
  ),
  (
    4, 1,
    STR_TO_DATE('2012-01-03', '%Y-%m-%d'),
    STR_TO_DATE('2012-01-04', '%Y-%m-%d')
  ),
  (
    5, 1,
    STR_TO_DATE('2012-01-06', '%Y-%m-%d'),
    STR_TO_DATE('2012-01-07', '%Y-%m-%d')

  );

MySQL - Function to Capitalize First Letter of a Word

October 15, 2015 - I was bored so I went to play around with MySQL and solve some simple problem or exercise below to energize my playful mind.

Write a function to capitalize the first letter of a word in a given string.

Example: initcap(UNITeD states Of AmERIca ) = United States Of America

CREATE TABLE names (name VARCHAR(250));

INSERT INTO names (name) VALUES

  ("uNited states oF americA");

MySQL - Rank Order by Votes

October 15, 2015 - I was bored so I went to play around with MySQL and solve some simple problem or exercise below to energize my playful mind.

Write a query to rank order the following table in MySQL by votes, display the rank as one of the columns.

CREATE TABLE votes ( name CHAR(10), votes INT );

INSERT INTO votes VALUES
  ('Smith',10),
  ('Jones',15),
  ('White',20),
  ('Black',40),
  ('Green',50),
  ('Brown',20);

Backup or Restore PostgreSQL Database

There is an easy way to create backup file and restore your current PostgreSQL database using the Linux terminal. I am not sure though if this is the easiest way.

As of the moment I am writing this article, I used the following command to backup and restore my database. 

Using pg_dump and psql will make your life easier. Below are the terminal command I use to backup and restore my database.

• Backup : pg_dump -U {user_name} {database_name} -f {backup_file_name}
• Restore : psql -U {user_name} -d {database_name} -f {backup_file_name}

If you are getting an error:

Properties File with Arguments or Pameters

The goal on this tutorial is to be able to format a value on a properties file given its parameter or arguments. It is best describe as passing value as a parameter and inserting those values on the string retrieved from the properties file.

To better understand what I'm doing, read and understand my example code below.

Property File Sample

message.welcome= Welcome {0} to {1}!
message.thank= Thank you for you visit {0}.

Embedded Jetty in Spring MVC, IoC/DI

I was trying to configure embedded jetty in a spring application that implements MVC(Model View Controller). I want to utilize single spring applicationContext xml file for IoC(Inversion of Control) and DI(Dependency Injection) on dispatcher servlets.

The goal is to be able to use or reference beans configured/located on already been loaded spring application context. Read and understand my resolution below.