Rails + Ember + MongoDB + bootstrap

I was fired up to try out ember.js after seeing Cameron's presentation at the last Singapore Ruby Brigade meetup.

Ember is one of the many javascript MVC frameworks that have been sprouting up over the past year, and it seems to offer a nice level of abstraction. I was quite interested to see how it might fit for a Rails/MongoDB application we're currently working on, so a few tests were in order.

I hosted some tests on a Rails 3.2.2 base, and threw in a whole bunch of technologies to see how well they play together. The (more...)

Extracting a discrete set of values

Today’s I love Python moment is bought to you by set types.

I have a file, XML naturally, the contains a series of transactions. Each transaction has a reference number, but the reference number may be repeated. I want to pull the distinct set of reference numbers from this file. The way I learnt to build up a discrete set of items (many years ago) was to use a dict and set default.

>>> ref_nos = {}
>>> for record in records:
>>>     ref_nos.setdefault(record.key, 1)
>>> ref_nos.keys()

But Python has had a sets module since 2. (more...)

Adding Mobile Support with Web 2.0 Touch to the NoAgenda Attack Vector Dashboard

The quest for an ideal javascript framework for mobile web applications has been a bit of a work-in-progress for some time (at least if you cared about cross-platform).

You might have got started (like me) with Jonathan Stark's excellent books Building iPhone Apps with HTML, CSS, and JavaScript and Building Android Apps with HTML, CSS, and JavaScript, and maybe tried the jQTouch framework that these spawned. Meanwhile, the official jQuery mobile framework has slowly been moving to fruition.

I recently discovered another project - Web 2.0 Touch - that is pitched as a mini framework with better features (more...)

gitfall#1: Falling off a branch

Ever had a merge fail with a fatal: git write-tree failed to write a tree message out of the blue?

It sounds terrifying, but when I got the root cause is quite mundane: file name conflicts in the merging commits that git is not smart enough to figure out without help. And when you fixup your merge, you are left with a commit that's lost one of its parents ("falling off a branch").

If you do much file reorganisation in a project with branches, it turns out this can be quite common (had it a few times on a recent (more...)

Easy Business Intelligence with eazyBI

I have been interested in business intelligence and data warehouse solutions for quite a while. And I have seen that traditional data warehouse and business intelligence tool implementations take quite a long time and cost a lot to set up infrastructure, develop or implement business intelligence software and train users. And many business users are not using business intelligence tools because they are too hard to learn and use.

Therefore some while ago a had an idea of developing easy-to-use business intelligence web application that you could implement and start to use right away and which would focus on ease-of-use (more...)

EclipseLink: Multitenancy with Oracle VPD

As of EclipseLink Indigo (2.3.0) you have been able to use the @Multitenant feature to share a database schema between multiple tenants. Did you know that you can also use this feature together with the Oracle Virtual Private Database (VPD) support that has been available in EclipseLink since version 1.0?

This powerful combination of features allows for the shared tables to be managed directly on the database, and for inserts to be automatically associated with the proper client. Any SQL executed by EclipseLink (even if EclipseLink did not generate it - ie native queries) will go through (more...)

Oracle enhanced adapter 1.4.0 and Readme Driven Development

I just released Oracle enhanced adapter version 1.4.0 and here is the summary of main changes.

Rails 3.1 support

Oracle enhanced adapter GitHub version was working with Rails 3.1 betas and release candidate versions already but it was not explicitly stated anywhere that you should use git version with Rails 3.1. Therefore I am releasing new version 1.4.0 which is passing all tests with latest Rails 3.1 release candidate. As I wrote before main changes in ActiveRecord 3.1 are that it using prepared statement cache and using bind variables in many (more...)

GlassFish 3.1.1 Ships with EclipseLink 2.3!

GlassFish 3.1.1 shipped today which makes it the first application server with the new multi-tenancy and extensible persistence unit support as well as all the other new features included in EclipseLink 2.3. If you're a GlassFish developer and you're upgrading to 3.1.1 you can find out all about the new features available in EclipseLink 2.3 on the EclipseLink Wiki.

To wet your appetite, Alexis Moussine-Pouchkine posted a screencast of building a multi-tenant enabled application on a pre-release build of GlassFish 3.1.1 on his blog and now would be a great time to check it out!

Shaun Smith, EclipseLink Team

Mikko Hyppönen@TED

Doing more than just talking about viruses: he fires up a few classics in a DOS box and pokes around with a binary editor before looking at current threats and live infection data. Very cool and entertaining. Not many are brave enough to do live demos, but if you watch to the end you'll get to see how prepared he was for failure;-)

Best served with sides of:

It goes PING!

If you're like me, you have a bunch of trusty (and rusty) shell scripts that you reach for when doing things like testing a new load balancer.

Enough of that! igp (It goes PING!) is a simple command line utility for testing services with a range of common protocols: ICMP, UDP, TCP, HTTP/S, LDAP/S and so on.

This is nothing earth shattering I know, but it's nice to have simple cross-platform (since it's ruby) tool that does all the common protocols in one. Thankfully, most of the work has already been done by the net-ping library - igp really (more...)

EclipseLink 2.3.0 (Indigo) Released

Since joining the family here at Eclipse a few years ago, one thing I can always count on is a hectic and exciting start to summer. This summer is no exception, and is kicked off with the release of EclipseLink 2.3.0 (Indigo).

Before I continue with brief descriptions of some of the new features of EclipseLink 2.3.0, I would like to thank everyone who was involved with this release. Whether your contribution to the project consisted of finding and entering bugs, contributing to the forums, or designing and implementing features, your contribution was important to the (more...)

EclipseLink Indigo Preview: Shared Databases for Multiple Tenants

Challenged to take an existing application and re-use it for a new customer or group of users (tenant)? Instead of customizing the application, adding new hardware or re-configuring the database for each new tenant, you can now build EclipseLink JPA enabled applications hosting requests from multiple tenants with all their data co-located.

Starting with EclipseLink 2.3, part of the annual Eclipse Indigo release, you can now have multiple application tenants sharing a database schema. EclipseLink enables you to configure your database tables for shared storage by simply providing tenant discriminator column(s) and providing values for these discriminators within your (more...)

Extend your Persistence Unit on the fly

Imagine a system that keeps track of player statistics in a sports league. Personal information such as name, height, weight and basic statistics such as the number of games played is stored for all players.

A persistence unit is deployed with all the mappings described above.

The system admin of a basketball league wants to use the system and add mappings for points scored and fouls. As the system is running they tell EcliseLink about mappings for those fields and the next EntityManager they get uses them.

Starting with EclipseLink 2.3, you can do just that. To do that, (more...)

EclipseLink RefCardz Available

A new RefCardz is available from DZone on JPA development with EclipseLink:


Thanks to Gordon Yorke for his hard work putting this together during the busy months leading up to the EclipseLink 2.3 (Indigo) release.

Recent conference presentations

Recently I has not posted any new posts as I was busy with some new projects as well as during May attended several conferences and in some I also did presentations. Here I will post slides from these conferences. If you are interested in some of these topics then ask me to come to you as well and talk about these topics :)

Agile Riga Day

In March I spoke at Agile Riga Day (organized by Agile Latvia) about my experience and recommendations how to adopt Agile practices in iterative style.



Multi-tenancy with Rails

RedDotRubyConf 2011 in Singapore is over. It was an amazing event (ryan takes notes so we don't have to - day#1 day#2)

Somehow I managed to cheat my way into a line-up of legendary speakers that included Matz himself. Here are the slides..

I spoke about multi-tenancy - what it is and why it's increasingly relevant for Rails development. It dives a little into four of the many approaches and ends with the challenge: Isn't it about time there was a 'Rails Way'?

Blogarhythm: So Many Ways POP DISASTER

Oracle enhanced adapter 1.3.2 is released

I just released Oracle enhanced adapter version 1.3.2 with latest bug fixes and enhancements.

Bug fixes and improvements

Main fixes and improvements are the following:

  • Previous version 1.3.1 was checking if environment variable TNS_NAME is set and only then used provided database connection parameter (in database.yml) as TNS connection alias and otherwise defaulted to connection to localhost with provided database name. This was causing issues in many setups.
    Therefore now it is simplified that if you provide only database parameter in database.yml then it by default will be used as TNS connection alias (more...)

ruby-plsql-spec upgraded to use RSpec 2.0

Initial version of ruby-plsql-spec gem was using RSpec version 1.3. But recently RSpec 2.0 was released which API is not compatible with previous RSpec 1.x API and as a result plsql-spec utility was failing if just RSpec was upgraded to version 2.0.

Therefore I updated also ruby-plsql-spec to use latest RSpec 2.0 gem and released ruby-plsql-spec gem version 0.2.1. You can install the latest version with

gem install ruby-plsql-spec

Upgrade from previous version

If you previously already installed initial ruby-plsql-spec version 0.1.0 then you need to update your spec/spec_helper.rb file (more...)

ruby-plsql-spec gem and code coverage reporting

During recent Oracle OpenWorld conference I presented session PL/SQL unit testing can be fun! where I demonstrated how to do PL/SQL unit testing with Ruby:

Audience was quite interested and had a lot of questions and therefore it motivated me to do some more improvements to ruby-plsql-spec to make it easier for newcomers.

ruby-plsql-spec gem and plsql-spec command line utility

Initially ruby-plsql-spec was just repository of sample tests and if you wanted to start to use it in your project you had to manually pick necessary files and copy them to your project directory.

Now ruby-plsql-spec is (more...)

EclipseLink at Open World/Java One/Oracle Develop 2010

The EclipseLink project will be well represented this year at Java One and Open World. If you are here attending the shows then I recommend you attend some of our sessions or drop by and visit us at the exhibition booths.

ID#: S314492
Title: Java Persistence API (JPA) 2.0 with EclipseLink
Date: 20-SEP-10
Time: 16:00-17:00
Hilton San Francisco, Golden Gate 4/5

ID#: S317452
Title: Advanced Enterprise Persistence
Date: 22-SEP-10
Time: 10:00-11:00
Hotel Nikko, Nikko Ballroom II

S314491: Effective XML: Leveraging JAXB and SDO
Date: 22-SEP-10
Time: 13:00-14:00
Hilton San Francisco, Yosemite A

S313434: Java Persistence API Futures BOF
Date: (more...)