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Posted to users@cocoon.apache.org by Christoph Hermann <ch...@guschtel.de> on 2005/08/01 14:09:45 UTC
Instantiating a class on Cocoon startup
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Hello,
is there a way in Cocoon to load a class on cocoon startup?
What i want to accomplish is like read some sort of configuration file
and then hold these values in memory while cocoon is running.
So i thought of building a xml file which is loaded through xmlbeans
into a static var or so. Thath way i wouldn't have to load the
configuration File on each request.
Can anyone give me some hints on how to accomplish this?
With kind regards
Christoph Hermann
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Re: Instantiating a class on Cocoon startup
Posted by Bertrand Delacretaz <bd...@apache.org>.
Le 1 août 05, à 15:05, Christoph Hermann a écrit :
>> ...*BUT*, maybe you just need XMLFileModule[1]? ;-)
>> Or at least you should implement your own input module to easy obtain
>> your configuration.
>
> well, it looks very interesting. Is it documented somewhere in a more
> detailed way? i.e. how to access it from flowscript?
Here's an example which gets a value from an input module named "xyz"
function conf_get_nxms_value(path) {
var module = null;
var result = null;
try {
module = cocoon.getComponent(InputModule.ROLE +
"Selector").select("xyz");
result = module.getAttribute(path,null,null);
if(result==null) throw new java.lang.Exception("nxms
configuration value '" + path + "' not found");
} finally {
// selected components need not be released, right?
}
return result;
}
This is perfect for reading configs from an XML file, with automatic
reloading if the input module is configured for this.
-Bertrand
Re: Instantiating a class on Cocoon startup
Posted by Christoph Hermann <ch...@guschtel.de>.
g[R]eK schrieb:
Hello,
> If you want your class to be loaded at startup you have to create
> interface like:
> package your.package;
>
> import org.apache.avalon.framework.component.Component;
> [...]
Thanks for the detailed explanation!
> *BUT*, maybe you just need XMLFileModule[1]? ;-)
> Or at least you should implement your own input module to easy obtain
> your configuration.
well, it looks very interesting. Is it documented somewhere in a more
detailed way? i.e. how to access it from flowscript?
The only docs i found were:
http://wiki.apache.org/cocoon/InputModules
and the link you told me.
Christoph
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Re: Instantiating a class on Cocoon startup
Posted by "g[R]eK" <gr...@bluebottle.com>.
Christoph Hermann napisał(a):
>-----BEGIN PGP SIGNED MESSAGE-----
>Hash: SHA1
>
>Hello,
>
>is there a way in Cocoon to load a class on cocoon startup?
>What i want to accomplish is like read some sort of configuration file
>and then hold these values in memory while cocoon is running.
>So i thought of building a xml file which is loaded through xmlbeans
>into a static var or so. Thath way i wouldn't have to load the
>configuration File on each request.
>Can anyone give me some hints on how to accomplish this?
>
>
If you want your class to be loaded at startup you have to create
interface like:
package your.package;
import org.apache.avalon.framework.component.Component;
public interface YourNiceIterface extends Component {
String ROLE = PersistenceFactory.class.getName();
//some methods
}
and then class:
public class YourNiceClass implements YourNiceInterface, Configurable,
Serviceable, Initializable, Disposable, ThreadSafe {
//implement what you want
}
All these interfaces (excluding YourNiceInterface) are Avalon's
interfaces and they are to tell that you need initialization
(Initializable) of your component.
If you need some logging, then your class should derive from
AbstractLogEnabled. If you need more details about intefaces, just ask.
Then you have to put in cocon.xconf something like this:
<component class="your.package.YourNiceClass"
role="your.package.YourNiceInteface"/>
*BUT*, maybe you just need XMLFileModule[1]? ;-)
Or at least you should implement your own input module to easy obtain
your configuration.
[1]
http://cocoon.apache.org/2.1/apidocs/org/apache/cocoon/components/modules/input/XMLFileModule.html
--
g[R]eK
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AW: Instantiating a class on Cocoon startup
Posted by Jens Maukisch <jm...@s-und-n.de>.
Hi,
>
> is there a way in Cocoon to load a class on cocoon startup?
> What i want to accomplish is like read some sort of
> configuration file and then hold these values in memory while
> cocoon is running. So i thought of building a xml file which
> is loaded through xmlbeans into a static var or so. Thath way
> i wouldn't have to load the configuration File on each
> request. Can anyone give me some hints on how to accomplish this?
>
You can wirte an avalon component:
e.g.:
class ConfigManager implements Component, ThreadSafe, Initializable {
String xmlConfig;
public static String ROLE = ConfigManager.getClass().getName();
public void initialize() {
xmlConfig = ....;
}
public String getConfiguration() {
return xmlConfig;
}
}
and then you can get this component via the ServiceManager
e.g. in Flowscript:
var config = cocoon.getComponent(Packages.ConfigManager.ROLE);
print(config.getConfiguration());
hth
Jens
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