Hi,
I've been using Jython in cocoon for some time by using my own
JythonGenerator. And I feel it's simplicity and speed that I can test
things is very nice.
ScriptGenerator have several shortcomings regarding using Jythons Lib
modules and I tried to fix them, but they messed ScriptGenerator too
much ,so I decided to move all those modifications to JythonGenerator.
I'm using JythonGenerator like this:
<map:generate src="tests/test.py" type="python">
<parameter name="databasepool" value="valkeus"/>
<parameter name="python.path" value="c:/prog/jython/lib"/>
<parameter name="classpath" value="c:/prog/jython/jython.jar"/>
Not sure are those settings best to be there or somewhere else?
I can also import all .py files that are in python.path or in the same
directory as my test.py.
Example script using database:
test.py
-----
import com.ziclix.python.sql as sql
import mymodule
#connection is pooled connection from sitemap
con = sql.PyConnection(connection)
cur = con.cursor(1);
user = request.getParameter("user")
data = mymodule.getdata()
output.append("<db>")
cur.execute("select * from users where name=? and data=?",(user,data))
for users in cur.fetchall():
output.append("<user>%s</user>"%users[0])
output.append("</db>")
-----
I feel quite good on using Jython with Cocoon, it let me escape from XSP
verbosity. The question of speed arises though. Now script is loaded
everytime request comes. Any advise on that?
In attachment you can find the JythonGenerator.
Thanks,
Lassi Immonen
/*
============================================================================
The Apache Software License, Version 1.1
============================================================================
Copyright (C) 1999-2002 The Apache Software Foundation. All rights reserved.
Redistribution and use in source and binary forms, with or without modifica-
tion, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
3. The end-user documentation included with the redistribution, if any, must
include the following acknowledgment: "This product includes software
developed by the Apache Software Foundation (http://www.apache.org/)."
Alternately, this acknowledgment may appear in the software itself, if
and wherever such third-party acknowledgments normally appear.
4. The names "Apache Cocoon" and "Apache Software Foundation" must not be
used to endorse or promote products derived from this software without
prior written permission. For written permission, please contact
[EMAIL PROTECTED]
5. Products derived from this software may not be called "Apache", nor may
"Apache" appear in their name, without prior written permission of the
Apache Software Foundation.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
This software consists of voluntary contributions made by many individuals
on behalf of the Apache Software Foundation and was originally created by
Stefano Mazzocchi <[EMAIL PROTECTED]>. For more information on the Apache
Software Foundation, please see <http://www.apache.org/>.
*/
package org.apache.cocoon.generation;
import org.apache.avalon.excalibur.xml.Parser;
import org.apache.avalon.framework.configuration.Configurable;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.avalon.framework.context.Contextualizable;
//import org.apache.avalon.framework.context.Context;
import org.apache.avalon.framework.context.ContextException;
//import org.apache.avalon.framework.activity.Disposable;
import org.apache.avalon.framework.component.*;
import org.apache.avalon.excalibur.datasource.DataSourceComponent;
import org.apache.cocoon.ProcessingException;
import org.apache.cocoon.ResourceNotFoundException;
import org.apache.cocoon.environment.Source;
import org.apache.cocoon.environment.Request;
import org.apache.cocoon.environment.ObjectModelHelper;
import org.apache.cocoon.environment.Response;
import org.apache.cocoon.environment.Context;
import org.apache.cocoon.Constants;
import org.xml.sax.InputSource;
import java.io.FileNotFoundException;
import java.io.Reader;
import java.io.StringReader;
import java.io.File;
import org.python.util.PythonInterpreter;
import org.python.core.*;
import java.sql.Connection;
import java.util.Properties;
/**
* The JythonGenerator executes arbitarily python scripts
*
*/
public class JythonGenerator extends ComposerGenerator implements
Composable,Contextualizable {
/**The database selector */
protected ComponentSelector dbSelector;
/** The source */
private Source inputSource;
protected org.apache.avalon.framework.context.Context avalonContext = null;
/**
* Composable
*/
public void compose(ComponentManager manager) throws ComponentException {
super.compose(manager);
if (this.dbSelector == null) {
try {
this.dbSelector = (ComponentSelector) manager.lookup(
DataSourceComponent.ROLE + "Selector");
} catch ( ComponentException cme ) {
this.getLogger().error( "Could not get the DataSource
Selector", cme );
}
}
}
/** Contextualize this class */
public void contextualize(org.apache.avalon.framework.context.Context context)
throws ContextException {
this.avalonContext = context;
}
public void recycle() {
super.recycle();
if (this.inputSource != null) {
this.inputSource.recycle();
this.inputSource = null;
}
}
public void generate() throws ProcessingException {
Parser parser = null;
try {
// Figure out what file to open and do so
getLogger().debug("processing file [" + super.source + "]");
this.inputSource = this.resolver.resolve(super.source);
getLogger().debug("file resolved to [" +
this.inputSource.getSystemId() + "]");
// TODO: why doesn't this work?
// Reader in = src.getCharacterStream();
Reader in = new
java.io.InputStreamReader(this.inputSource.getInputStream());
StringBuffer output = new StringBuffer();
getLogger().debug("JythonGenerator execution begining");
String poolName =
this.parameters.getParameter("databasepool",null);
String pythonpath =
this.parameters.getParameter("python.path","");
String scriptDir = this.inputSource.getSystemId();
if (scriptDir.startsWith("file:") )
scriptDir = scriptDir.substring(5);
String pythonSrc = scriptDir;
//Better ways to do this?
int li = scriptDir.lastIndexOf('/');
if (li < scriptDir.length()-1)
scriptDir = scriptDir.substring(0, li);
pythonpath += File.pathSeparatorChar + scriptDir;
File workDir =
(File)avalonContext.get(Constants.CONTEXT_WORK_DIR);
getLogger().debug("avalon workdir:" + workDir.toString());
String fcp =
(String)avalonContext.get(Constants.CONTEXT_CLASSPATH);
//getLogger().debug("context classpath :" + fcp);
// adding classpath also
String classpath =
this.parameters.getParameter("classpath","");
Properties properties = new Properties();
properties.setProperty("java.class.path",classpath);
properties.setProperty("python.path",pythonpath);
properties.setProperty("python.home", workDir.toString());
properties.setProperty("python.packages.fakepath", fcp);
PythonInterpreter.initialize(System.getProperties(),
properties, new String[]{});
PythonInterpreter pyi = new PythonInterpreter();
// Declaring these instead of registering for these to be
always avail
pyi.set("resolver", this.resolver);
pyi.set("source", super.source);
pyi.set("parameters", this.parameters);
pyi.set("output", output);
pyi.set("logger", getLogger());
Request req = ObjectModelHelper.getRequest(this.objectModel);
Response res = ObjectModelHelper.getResponse(this.objectModel);
Context con = ObjectModelHelper.getContext(this.objectModel);
pyi.set("request",req);
pyi.set("response",res);
pyi.set("context",con);
// Giving connection to script if it want's one
if (poolName != null) {
try {
getLogger().debug("Getting databasepool named:
"+poolName);
DataSourceComponent datasource =
(DataSourceComponent)dbSelector.select(poolName);
Connection connection =
datasource.getConnection();
pyi.set("connection", connection);
}catch( Exception e) {
getLogger().error("Could not get the
datasource",e);
throw new RuntimeException("Could not get the
datasource "+e);
}
}
// Execute the script
getLogger().debug("Running python script [" +pythonSrc+ "]");
pyi.execfile(pythonSrc);
getLogger().debug("output = [" + output.toString() + "]");
// Extract the XML string from the BSFManager and parse it
InputSource xmlInput =
parser = (Parser)(this.manager.lookup(Parser.ROLE));
parser.parse(xmlInput, this.xmlConsumer);
} catch (ProcessingException e) {
throw e;
} catch (FileNotFoundException e) {
throw new ResourceNotFoundException(
"Could not load script " +
this.inputSource.getSystemId(), e);
} catch (PyException e) {
throw new ProcessingException("PythonException in
JythonGenerator.generate()", e);
}catch (Exception e) {
throw new ProcessingException(
"Exception in JythonGenerator.generate()", e);
} finally {
this.manager.release(parser);
}
}
}
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, email: [EMAIL PROTECTED]
