Django on Jython Leo Soto

Leo Soto

Not exactly “ Summer of Code” but... ...worked incredibly well! And that's why I'm here :)

Not exactly “ Summer of Code” but...

...worked incredibly well!

And that's why I'm here :)

Why Django on Jython ? Integration Deployment Performance

Integration

Deployment

Performance

Jython

Jython Implementation of Python Compiles to Java bytecode No foo.pyc It's foo$py.class

Implementation of Python

Compiles to Java bytecode

No foo.pyc

It's foo$py.class

Jython Makes Java look like Python And Python like Java to Java programs No GIL, no ref counting

Makes Java look like Python

And Python like Java to Java programs

No GIL, no ref counting

>>> from __future__ import GIL Traceback (most recent call last): ... SyntaxError: Never going to happen! (<stdin>, line 1)

State of Jython 2.5 99.4% of ~5700 test cases passing ~20% faster on PyStone [FWIW] 2.5 alpha 2 last weekend for DjangoCon September/October beta December/January final

99.4% of ~5700 test cases passing

~20% faster on PyStone [FWIW]

2.5 alpha 2 last weekend for DjangoCon

September/October beta

December/January final

Java - What We Like Great systems programming language Well-defined memory, concurrency model Standard libraries - concurrent collections

Great systems programming language

Well-defined memory, concurrency model

Standard libraries - concurrent collections

Java Ecosystem Excel, thru Apache POI support of OLE Full text search with Lucene Scalability with Hadoop, Hbase Scala, JRuby, Rhino...

Excel, thru Apache POI support of OLE

Full text search with Lucene

Scalability with Hadoop, Hbase

Scala, JRuby, Rhino...

Biggest Benefit Just use what is good out there in the Java ecosystem

Just use what is good out there in the Java ecosystem

Now...

Why in the name of... J2EE was a big, horrible mistake But lessons have been learned And it’s possible to use that infrastructure

J2EE was a big, horrible mistake

But lessons have been learned

And it’s possible to use that infrastructure

“We write Java so you don’t have to.”

Combination In Python code: Django app framework Models, templates, forms Business logic - as complex as necessary In Java code (optional) Performant infrastructure

In Python code:

Django app framework

Models, templates, forms

Business logic - as complex as necessary

In Java code (optional)

Performant infrastructure

Deployment Options Java App Servers!

Java App Servers!

modjy Servlets <=> WSGI

Servlets <=> WSGI

WAR! Web ARchive format Standard deployment of Java webapps Just a zip file with a standard directory layout

Web ARchive format

Standard deployment of Java webapps

Just a zip file with a standard directory layout

A Django WAR: jython manage.py war --include-java-libs=XXX.jar

jython manage.py war --include-java-libs=XXX.jar

WAR format for DoJ |-- WEB-INF | |-- lib ← JDBC driver | `-- lib-python | |-- Lib ← Python Std. library | |-- django | |-- doj | |-- modjy-django | `-- mysite ← Your code! `-- media ← (and media files)

|-- WEB-INF

| |-- lib ← JDBC driver

| `-- lib-python

| |-- Lib ← Python Std. library

| |-- django

| |-- doj

| |-- modjy-django

| `-- mysite ← Your code!

`-- media ← (and media files)

What’s missing PIL! so no Photolog Oracle, MySQL, SQLServer backends But that’s easy zxJDBC: JDBC <=> DB-API

PIL! so no Photolog

Oracle, MySQL, SQLServer backends

But that’s easy

zxJDBC: JDBC <=> DB-API

Django Backend Dev Features Operations Client Creation and Introspection Validation Wrapper

Features

Operations

Client

Creation and Introspection

Validation

Wrapper

Demo

Thanks!