Re: [Springframework-developer] added jython scripting support to spring

[<ja...@ti...>]

Hi John,

I haven't had a chance to play with your code yet. Have you seen this
version by Yan Weng?:
http://yanweng.blogspot.com/2006/02/prototype-of-jython-scriptfactory-for.html

James Tikalsky

> I felt it was important to add jython support since the python
> following is still strong.
>
> Also looks like the jython project is becoming more active with
> ambitions to sync up to the latest version of c python.
>
> i still like python... call me old school.
>
> so anyway this is what I did:
>
> I created an extension to the spring-lang-2.0.xsd:
>
> 	<xsd:element name="jython" type="dynamicScriptType">
> 		<xsd:annotation>
> 			<xsd:documentation><![CDATA[
> 	A Spring bean backed by a Jython class definition.
> 			]]></xsd:documentation>
> 		</xsd:annotation>
> 	</xsd:element>
>
> Then added a package org.springframework.scripting.jython with the
> following sources added: JythonScriptFactory.java
>
> In "getScriptedObject" perform the following:
>
> 	public Object getScriptedObject(ScriptSource actualScriptSource,
> Class[] actualInterfaces)
> 			throws IOException, ScriptCompilationException {
> 		try {
> 			PythonInterpreter.initialize(System.getProperties(),null, new String[]
> {});
> 			PythonInterpreter interpreter = new PythonInterpreter();
> 			interpreter.exec(actualScriptSource.getScriptAsString());
> 			PyStringMap locals = (PyStringMap) interpreter.getLocals();
> 			PyList list = locals.values();
> 			PyClass clazz = null;
> 			for (int i=0; i < list.__len__(); i++) {
> 				PyObject py = list.__getitem__(i);
> 				if ((py instanceof PyClass) && !(py instanceof PyJavaClass)) {
> 					if (clazz != null) throw new PyException(new PyString("multiple
> python class declarations present"));
> 					clazz = (PyClass) py;
> 				}
> 			}
> 			PyInstance instance = (PyInstance) clazz.__call__();
> 			return instance.__tojava__(actualInterfaces[0]);
> 		}
> 		catch (PyException ex) {
> 			throw new ScriptCompilationException("Could not compile Jython
> script: " + actualScriptSource, ex);
> 		}
> 	}
>
>
> This is just a POC.  It would be nice if we could specify the class
> name as part of the ScriptSource object so we don't have to guess
> which in the locals namespace class we are interested in.
>
> Also in the org.springframework.scripting.config.LangNamespaceHandler
> I add to the init method:
>
> 		if (ClassUtils.isPresent("org.python.core.PyObject")) {
> 			registerBeanDefinitionParser("jython", new
> ScriptBeanDefinitionParser(JythonScriptFactory.class));
> 		}
>
> So here is an excerpt from a beans file:
>
> 	<bean id="SPAM" class="jcoppola.atsi.application.SetRunnableTest">
> 		<property name="runnable" ref="runnable1"/>
> 	</bean>
>
> 	<bean id="EGGS" class="jcoppola.atsi.application.SetRunnableTest">
> 		<property name="runnable" ref="runnable2"/>
> 	</bean>
>
> 	<lang:jython id="runnable1" script-interfaces="java.lang.Runnable">
> 		<lang:inline-script>
> from java.lang import Runnable
>
> class JythonRunnable(Runnable):
> 	def __init__(self):
> 		print "__init__: JythonRunnable1"
> 	def run(self):
> 		print "run: JythonRunnable1"
> 		</lang:inline-script>
> 	</lang:jython>
>
> 	<lang:jython id="runnable2" script-interfaces="java.lang.Runnable">
> 		<lang:inline-script>
> from java.lang import Runnable
>
> class JythonRunnable(Runnable):
> 	def __init__(self):
> 		print "__init__: JythonRunnable2"
> 	def run(self):
> 		print "run: JythonRunnable2"
> 		</lang:inline-script>
> 	</lang:jython>
>
> I'll provide a patch if this gains traction.
>
> Cheers,
> John Coppola
>
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