PyAtl: Atlanta Python Programmers Message Board › Special Event Tuesday, April 22nd: Jython Committer Jim Baker in Atlanta

Special Event Tuesday, April 22nd: Jython Committer Jim Baker in Atlanta

A former member
Post #: 8
Hi PyAtl colleagues! Wanted to let you know about a special event coming up next week. AJUG is sponsoring a venue for Jim Baker to come and speak in Atlanta. Those of you who attended PyCon 2007 or 2008 may have heard Jim speak, and anyone following the Jython project's revival over the last 18 months or so has certainly heard Jim's name.

Details of the event are posted below; hope to see you there! No need to RSVP; AJUG's events are held at a hotel, so no security issues for parking and getting into the building.

What: Putting Dynamic Languages on the JVM to Work: A Jython Case Study
When: Tuesday, April 22nd at 7:00 PM
Who: Jim Baker, Jython Committer and JRuby collaborator
Where: AJUG's Usual Meeting Location

Jim's Bio:

Jim Baker has over 15 years of professional software development experience, focusing on business intelligence, enterprise system management, and high-performance web applications. He co-founded both Empact Solutions, raising $10M in VC financing, and BizLogix. Jim also leads the Front Range Pythoneers, the Boulder Python Users Group. Jim graduated from Harvard College, A.B., Computer Science magna cum laude and Brown University, Sc.M., Computer Science (and an all-but-dissertation Ph.D. candidate). Jim is a Jython committer. He first started working with Java in 1995.

Event Abstract:

Django is a popular web application framework written in Python that is often compared to Ruby on Rails (RoR). Like RoR, Django enables developers to quickly build high-performance web apps with a robust database backend. But many web apps have needs that go beyond this standard three-tier configuration, even as enhanced with load balancing and caching. Or they have specific libraries they need to access. Because of these requirements, developers have turned to Java Enterprise Edition and related solutions, albeit at a higher development cost. But is it possible to combine the benefits of both?

Django on Jython is such a solution. By combining the time-to-market advantages of Django with the heavy-lifting capabilities of the Java platform, developers get the best of both worlds. Jython is an implementation of Python that runs on the Java Virtual Machine (JVM) via bytecode compilation. It can therefore readily interoperate with existing Java code, while also taking advantage of the Python ecosystem. This includes Django: as committers on the Jython project, we have recently added support for Django to the trunk version of Jython, and we plan to enhance this for the forthcoming release of Jython 2.5 this year.

In this talk, we will begin by introducing Django, as well as basic Python functionality. Jython, like other Python implementations, supports an interactive object shell. (This is a familiar concept to users who have worked with Lisp, Ruby, or Smalltalk, and it is a hallmark of a dynamic language.) This is powerful stuff. We can create a new Jython class that extends a Java class on the fly; or call methods on Java objects; or work directly with Django's object-relational mapper. In fact, all of Django's functionality is available from the object shell. To complement Django, we will look at one popular module for Python, dateutil, that provides easy-to-use date and datetime support, including generic parsing, iCalendar recurrence rules, and relative deltas, such as the last week of month for a given date.

Of course, the object shell is just a tool for developers. Similar to the servlet API, Python web app frameworks have adopted a common API called WSGI. The modjy component provides a mapping between WSGI-supporting servers on Jython and servlet containers for Java. We will show a couple of examples of various open source stacks that can be used with DoJ, including Tomcat, MySQL, and PostgreSQL. Indeed we expect to see many more databases to be supportable by DoJ because of the leverage JDBC provides.

Then we will look at how two popular Java open source projects can be harnessed to Django by running it on Jython. The first is iText, which supports parsing and generation of PDF documents, as well as more specialized functionality like form filling. Outside of the Java ecosystem, there's only limited support in Python for PDF; the ReportLab toolkit is popular, but the open source version does not support PDF reading or form filling for example. We will show how you can use Django on Jython to automatically publish standard IRS 1099 forms.

Django supports using memcached for distributed caching. memcached is a proven solution, powering the scalability of such web sites as Flickr and Wikipedia. However, memcached only support short string keys with binary objects (Django stores objects through pickling, which is Python's own object serialization mechanism). The Java ecosystem provides a range of other options. In particular, Terracotta provides strong support for distributed computing. This works particularly well within the context of an Ajax-architected application running on Django, as we will show.

Web app development needs to be responsive to the rapid development cycles that are increasingly required. Django is a powerful solution for that. By combining it with Jython, developers can also take advantage of the Java resources they would otherwise miss out on.
A former member
Post #: 66
Sounds really cool, you had to pick the one day I am in another state smile I will probably be on a plane for this meeting, unfortunately.
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