Scripting

[manta7]

Hi guys

I have a problem but I didn't find the answer on the internet: from a camel route I'm trying to access to a script file

My camel-context is the following:

<scripting:endpoint

        service="test:script"

        endpoint="scriptEndpoint"

        script="classpath:script/script.js" />

And my camel route seems like:

from("seda:javascript").

     to("language://javascript:scriptEndpoint");

But Servicemix told me that the "scriptEndpoint" is not defined.. So I wondering how can I access to my scripting-endpoint to launch a Javascript ?

Thanks in advance!

[davsclaus]

Can you post the entire XML file. I wonder what namespace you use for the scripting tag?

[davsclaus]

And what version of ServiceMix and JDK are you using?

[manta7]

Thanks for helping me,

I use Servicemix 4.3 (and the OSGI way), with Camel 2.6 components and the JDK 1.5 (is there a difference with Java 6?).

Sorry I didn't have my XML on this computer, but I followed this  documentation with:

<beans xmlns:scripting="http://servicemix.apache.org/scripting/1.0"

       xmlns:test="http://servicemix.apache.org/test"

       xmlns:util="http://www.springframework.org/schema/util">

But I added also the schemaLocation:

http://servicemix.apache.org/scripting/1.0 http://servicemix.apache.org/scripting/1.0/servicemix-scripting.xsd

Indeed, without this line my component was not deployed

[ffang]

Hi,

You misuse camel language component and scripting JBI component here.

The endpoint you defined here

<scripting:endpoint

service="test:script"

endpoint="scriptEndpoint"

script="classpath:script/script.js" />

is a JBI endpoint, it can't be used directly in camel language component. Per the

The correct URI for camel language endpoint is

language://languageName[:script][?options]

where the script part is the script to execute, but it shouldn't be a endpoint name of  JBI scripting endpoint.

http://camel.apache.org/language.html

Freeman

[manta7]

Ok but I don't know how to complete the script argument in the language:// command...

"but it shouldn't be a endpoint name of JBI scripting endpoint"

What should it be so to access to my script.js  ?

Edited by: manta7 on May 5, 2011 7:00 AM

[davsclaus]

The  is as Freeman said a JBI component.

So you need to use the Camel JBI to interact with it

http://camel.apache.org/jbi

You cannot use the Camel language component directly with the JBI scripting component.

We should maybe improve the Camel language component so it can load a script from a resource (eg from a file on the classpath etc.). I will log an enhancement for that.

[davsclaus]

The enhancement ticket is here

https://issues.apache.org/jira/browse/CAMEL-3940

[manta7]

Ok thanks for the ticket and the answer I understand...

So according to my jbi endpoint which is:

<scripting:endpoint

        service="test:script"

        endpoint="scriptEndpoint"

        script="classpath:script/script.js" />

And to my test namespace which is: xmlns:test="http://company.perso.org"

My camel route should be: to("jbi:endpoint:http://company.perso.org/script/scriptEndpoint")

Isn't it ?

Because I get this exception :

09:34:27,564 | ERROR | 1 - seda://mslJS | SedaConsumer                     | ?                                   ? | 944 - org.apache.camel.camel-core

- 2.6.0 | Error processing exchange. Exchange[Message: ]. Caused by: [org.apache.camel.RuntimeCamelException - java.lang.IllegalStateEx

ception: Invalid BundleContext.]

[manta7]

Weird.. I restart Servicemix and I don't have the Invalid BundleContext anymore, but I can't still access to my JBI endpoint

<scripting:endpoint

        service="test:script"

        endpoint="scriptEndpoint"

        script="classpath:script/script.js" />

<bean class="org.apache.servicemix.common.osgi.EndpointExporter" />  

<osgi:camelContext  id="camelCTX" xmlns="http://camel.apache.org/schema/spring">

<package>org.my.mosaic.route</package>

</osgi:camelContext>

[ffang]

Hi,

Scripting endpoint is a kind of consumer jbi endpoint, it's an initial side of a MEP, so it couldn't play the role as a target.

Freeman

[davsclaus]

A solution with pure Camel would be to load the script file and provide it as a header before you send the message the the camel language component.

See that last example

http://camel.apache.org/language

You would then have to use for example java code to load the script file from the classpath.

[manta7]

Ok I succeed it !

Thanks for all your reply !

So for the next people's who will be lost as I was, the solution is indeed the last on this page :  http://camel.apache.org/language

You have to use a bean:

from("...").

to("bean:MyBean?method=xx");

Into the xx method, I wrote that:

CamelContext ctx = exchange.getContext();

ProducerTemplate producer = new DefaultProducerTemplate(ctx);

try {

producer.start();

producer.requestBodyAndHeader("language:javascript", exchange.getIn(), Exchange.LANGUAGE_SCRIPT, fileToString(myFile));

} catch (Exception e) {

//Exception

}

The fileToString method take a File as argument and return the content as a string

After on the js file you can access to the argument with context, exchange... (ScriptContext paragraph on  http://camel.apache.org/javascript.html)

Thx again !

[manta7]

Arf.. Unfortunately this solution leads to a problem..

Ideed, the JSR 223 provides the ScriptEngine class ( http://download.oracle.com/javase/6/docs/api/javax/script/ScriptEngine.html) and the put method which allows to set a Java object into the script.

With the source above, I can't pass Java objects... I'm lost :/

[manta7]

Ok I solved the problem! (I know it's a monologue )

The only thing I found was to change the camel-script component.

Indeed, in my component I put a Map<String, Object> into the header of the message. And in the evaluateScript(Exchange) method of the camel-script component, I iterate on the Map and I use the put() method of the ScriptEngine.

I know this is not the most used component, but I think it could be a nice little evolution.

Don't you think ?