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From Josh2007 <josh070...@gmail.com>
Subject Re: Migrating to Cocoon 2.2... calling servlets from Cocoon: ServletServiceGenerator
Date Thu, 22 Nov 2007 15:55:49 GMT

Thanks Grzegorz for this detailed reply, it really helps. 
I will take a look at the demos as well.

Regards,

Josh


Grzegorz Kossakowski-3 wrote:
> 
> Josh2007 pisze:
>> Hi,
>> 
>> I'm migrating from Cocoon 2.1 to Cocoon 2.2.
>> Cocoon 2.2 is deployed as a servlet in Tomcat along with 2 other
>> servlets:
>> Axis 2 and eXist xmldb.
>> 
>> It seems with Cocoon 2.2 I can call my 2 other servlets from Cocoon and
>> get
>> any xml result they will generate in my sitemap.
> 
> Yep, but you can only call servlets that are registered as Spring-beans,
> using configuration file
> like this[1]:
> 	<bean id="org.apache.cocoon.servletservice.demo1.servlet"
> class="org.apache.cocoon.servletservice.demo1.DemoServlet">
>     	<servlet:context mount-path="/test1">
>     		<servlet:init-params>
> 				<entry key="foo" value="baz"/>
> 			</servlet:init-params>
> 			<servlet:connections>
> 				<entry key="demo2"
> value-ref="org.apache.cocoon.servletservice.demo2.servlet"/>
> 			</servlet:connections>
> 		</servlet:context>
> 	</bean>
> 
> In most cases it's not a big problem to configure servlets that way.
> 
>> Can I do that with ServletServiceGenerator? Is there any example? I've
>> been
>> searching without success for now.
> 
> Actually, ServletServiceGenerator does something more than just fetching
> data from other servlets
> (it's a job of servlet source). Take a look at this example[2]:
> 
>       <!-- This is a test of basic servlet services functionality
>            servletService generator makes a HTTP POST request on
> servlet:test2:/basic-service.
>            Generator posts content of test.xml file and returns to the
> pipeline result of service call.
>       -->
>       <map:match pattern="test5">
>         <map:generate type="servletService" src="test.xml">
>           <map:parameter name="service"
> value="servlet:test2:/basic-service?caller=generator"/>
>         </map:generate>
>         <map:serialize type="xml"/>
>       </map:match>
> 
> The comment above the match explains what happens quite well. The idea is
> to fetch data that is
> based on POSTed data. This way servlet:test2:/basic-service can be viewed
> as pipeline *fragment*
> looking even implementation[2] looks like this:
>       <!-- This basic service pipeline takes POSTed XML and applays simple
> transformation on it -->
>       <map:match pattern="basic-service">
>         <map:generate src="service-consumer:"/>
>         <map:transform src="service-test.xsl">
>           <map:parameter name="caller" value="{request-param:caller}"/>
>         </map:transform>
>         <map:serialize type="xml"/>
>       </map:match>
> 
>> Will my sitemap look like this?
>> 
>> <map:pipeline>       
>>   <map:match pattern="test">
>>     <map:generate src="anySoapRequest.xml"
>> type="ServletServiceGenerator"/>
>>     <map:serialize type="xml"/>
>>   </map:match>       
>> </map:pipeline>
> 
> I would say it would look like this:
> <map:pipeline>
>   <map:match pattern="test">
>     <map:generate src="servlet:axis:/anySoapRequest" type="file"/>
>     <map:serialize type="xml"/>
>   </map:match>
> </map:pipeline>
> 
>> Thanks for your help,
> 
> I suggest to take a closer look at cocoon-servlet-service-sample module
> that contains some simple
> demos. Of course they are not ideal but at least they present the most
> important features of Servlet
> Service Framework.
> 
> I hope that helps a little.
> 
> [1]
> http://svn.apache.org/repos/asf/cocoon/trunk/core/cocoon-servlet-service/cocoon-servlet-service-sample/src/main/resources/META-INF/cocoon/spring/cocoon-servlet-service-demo1-servletService.xml
> [2]
> http://svn.apache.org/repos/asf/cocoon/trunk/core/cocoon-servlet-service/cocoon-servlet-service-sample/src/main/resources/COB-INF/test1/sitemap.xmap
> [3]
> http://svn.apache.org/repos/asf/cocoon/trunk/core/cocoon-servlet-service/cocoon-servlet-service-sample/src/main/resources/COB-INF/test2/sitemap.xmap
> 
> -- 
> Grzegorz Kossakowski
> Committer and PMC Member of Apache Cocoon
> http://reflectingonthevicissitudes.wordpress.com/
> 
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> 
> 

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