Skip to main content

Jazoon 2007: Afternoon and evening

Great, I managed to do a java Black Belt attempt on Java 5 and ended up with 0/5 points. I've never even heard of that Scanner class. Think I better get started on that certification (again).

...

Went to a talk by Red Hat's Jan Wildeboer. Virtualization. RH now delivers a full stack with JBoss server and clustering. Most OS'es are built being able to dynamically use CPU and memory (not Windows of course).

Some keywords: VMWare invented x86 virtualization. Hypervisor, ring zero. There were performance issues (20% with heavy io, which is especially overhead intensive). Now there is something called para-virtualization with minimal overhead (1 - 5 %).

Talking about perfomance, live migration, upgrades..

Jboss clustering is still the solution for scaling up memory exploit as the JVM is not dynamically using memory or CPUs.

Virtualization offers us a lot of better perfomance, especially as more CPU's and memory are fitted onto boards.

The talk was a bit out of my league, but it is interesting to hear an alternative to Sun's Solaris/Zones we might consider. The RH guy claims he 's not allowed to present benchmarks, but that RH would win anyway.

...

The other guys went to see the GigaSpaces talk, so I'm tapping in on this one. I'm an old Hibernate user, and I've always wanted to dip into JDO, so that's bout the reason I'm here.

JPox Spatial, some GIS extension on the JDO standard.

Problem is mainly today that there are no tools with a DB back-end that supports GIS stuff. Or they're proprietary, etc.

JDO is a standard. JPOX is Sun's implementation. It also implements JPA.

Talks alot about different libraries from various commercial vendors that are compliant with JDO/Spatial, or the other way around.

The API for JPOX is pretty similar to Hibernate, only slighty worse (save, then get ID).

The spatial api for example gives us a query to ask whether a point is inside a polygon (or does polygons collide, etc).

All in all I think this might be a very exiting for GIS developers. There is an ISO standard on the way for doing these kind of data stores, and having a JDO API on top of these sounds like a good idea.

The speaker is doing some defence of JDO vs Hibernate, JDBC, EJB. Not new to me, I'm no happier with hibernate than I am with JPOX/JDO.

Runs with maven 1. Admittedly lacks the modularity of Spring/Hibernate.

Good idea, implementation sounds slightly immature, quite early into the market. Speaker is quite nervous, but engaged in what he's talking about.

...

Caught a talk on unusual use of Java to get stuff the way you usually would've done it in C. I've never been a C programmer so this talk went pretty much over my head, but it was still somewhat amusing to hear some innovative way of making your own iterators. Neil Gafter was in the seat behind me, and when he laughs it eases my mind thinking this is not stuff I have to do on my own, but can rather wait till it enters Java 7 (closures that is).

...

Now tapping into a talk on Java EE. Figured it was about time I try listening to something I actually know anything about. Leader of the Italian JUG presenting a year of experience with JEE 5. He's also written an Italian book on JEE 5.

The main difference is easier use with POJOs, annotations, injection, etc. Focus here is on EJB 3 and JPA. I've got to post this now but I'll post back on how it went. Probably not too many surprises in store here.

Comments

  1. There are quite some open source GIS desktop tools that work with open source Postgresql/Postgis (postgis.refractions.net) spatial DB backend.

    Especially Udig (udig.refractions.net) is worth looking at. Based on eclipse RCP and has an experimental jpox-spatial plugin.

    regards,
    Thomas

    ReplyDelete
  2. Gigaspaces and spatial pojo's are a topic that I am exploring right now. I posted this comment to the geotools mail list Pojo Data Store. The response I got mirrored your impressions. Currently I am looking at using hibernate spatial link and using gigaspaces as a second level cache in front of postgis.

    ReplyDelete
  3. Anonymous13/1/08 16:50

    JPOX is not Sun's implementation. It is an independent project. It implements JCP standards.

    The API for JPOX is pretty similar to Hibernate, only slighty worse (save, then get ID)
    Not sure what you're referring to here. JPOX supports application id (id defined by user, or generated by JPOX at persist) AND datastore id (id generated by JPOX at persist). If the id is selected to be generated in the datastore then you have to store first.

    ReplyDelete

Post a Comment

Popular posts from this blog

Open source CMS evaluations

I have now seen three more or less serious open source CMS reviews. First guy to hit the field was Matt Raible ( 1 2 3 4 ), ending up with Drupal , Joomla , Magnolia , OpenCms and MeshCMS being runner-ups. Then there is OpenAdvantage that tries out a handful ( Drupal , Exponent CMS , Lenya , Mambo , and Silva ), including Plone which they use for their own site (funny/annoying that the entire site has no RSS-feeds, nor is it possible to comment on the articles), following Matt's approach by exluding many CMS that seem not to fit the criteria. It is somewhat strange that OpenAdvantage cuts away Magnolia because it "Requires J2EE server; difficult to install and configure; more of a framework than CMS", and proceed to include Apache Lenya in the full evaluation. Magnolia does not require a J2EE server. It runs on Tomcat just like Lenya does (maybe it's an idea to bundle Magnolia with Jetty to make it seem more lightweight). I'm still sure that OpenAdvant

Managing dot-files with vcsh and myrepos

Say I want to get my dot-files out on a new computer. Here's what I do: # install vcsh & myrepos via apt/brew/etc vcsh clone https://github.com/tfnico/config-mr.git mr mr update Done! All dot-files are ready to use and in place. No deploy command, no linking up symlinks to the files . No checking/out in my entire home directory as a Git repository. Yet, all my dot-files are neatly kept in fine-grained repositories, and any changes I make are immediately ready to be committed: config-atom.git     -> ~/.atom/* config-mr.git     -> ~/.mrconfig     -> ~/.config/mr/* config-tmuxinator.git       -> ~/.tmuxinator/* config-vim.git     -> ~/.vimrc     -> ~/.vim/* config-bin.git        -> ~/bin/* config-git.git               -> ~/.gitconfig config-tmux.git       -> ~/.tmux.conf     config-zsh.git     -> ~/.zshrc How can this be? The key here is to use vcsh to keep track of your dot-files, and its partner myrepos/mr for o

Leaving eyeo

Thirteen blog posts later, this one notes my departure from eyeo after 4 years and 3 months. I joined eyeo around the headcount of 80 employees, and now I think there's just over 250 people there. My role coming in was as operations manager, doing a mix of infrastructure engineering and technical project management. I later on took on organizational development to help the company deal with its growing pains . We introduced cross-functional teams, departments (kind of like guilds), new leadership structures, goal-setting frameworks, onboarding processes and career frameworks.  And all of this in a rapidly growing distributed company. I'm proud and happy that for a long time I knew every employee by name and got to meet every single new-hire through training them on company structure and processes.  At some point, we had enough experienced leaders and organizational developers that I could zoom back in on working in one team, consulting them on  Git and continuous integration

Joining eyeo: A Year in Review

It's been well over a year since I  joined eyeo . And 'tis the season for yearly reviews, so... It's been pretty wild. So many times I thought "this stuff really deserves a bloggin", but then it was too inviting to grab onto the next thing and get that rolling. Instead of taking a deep dive into some topic already, I want to scan through that year in review and think for myself, what were the big things, the important things, the things I achieved, and the things I learned. And then later on, if I ever get around to it, grab one of these topics and elaborate in a dedicated blog-post. Like a bucket-list of the blog posts that I should have written. Here goes: How given no other structures, silos will grow by themselves This was my initial shock after joining the company. Only a few years after taking off as a startup, the hedges began growing, seemingly almost by themselves, and against the will of the founders. I've worked in silos, and in companies wit

Using Voice-Chat for Gamers in Distributed Teams

This is a post going into the usefulness of live voice-chat tools in distributed teams. If you've ever seen the Leeeeeroooooyy Jeeeenkiiins video of World of Warcraft fame, you've heard this kind of tool in action. It's how the participants in the video are speaking with each other - this is not a feature built into the World of Warcraft game - it's a separate team-oriented VoIP software, and it's all about letting gamers communicate orally while gaming.  Since these tools are for gamers, they have to be fast (low latency) light (as not to steal CPU-cycles from heavy games graphics)  moderate in bandwidth usage (as not to affect the game server connection) There are several options around: TeamSpeak , Ventrilo , more recently the massively grown Discord , and finally Mumble , which is the open-source alternative of the gang. A few years ago, when I joined eyeo (a distributed company), several of the operations team were avid gamers, and had a TeamSp