Re: Deployment scenarios for cocoon 3.0

On 30/01/2013 11:19, gelo1234 wrote:
> Hello,
>
> Im thinking about applying several urgent patches onto the running 
> cocoon 3.0 web app _without_ application server restart (be it Tomcat).
>
> Lets say I want to modify some code inside REST Controller 
> (MyRestController).
> I presume that If I make some change in REST Controller class i wont 
> be able just to replace jar/class files on running Tomcat and thats 
> it. It will NOT pick up the changes.
>
> So lets say i create a new class flle (another version of REST Controller:
> MyRestController2) and upload that class/jar file to Tomcat, then 
> change Cocoon sitemap.xmap to have a new class:
>
> <controller:call controller="rest-controller" 
> select="com.foo.controller.MyRestController2">
> ...
> </controller:call>
>
> and thats it ? Will Cocoon pick it up correctly WITHOUT Tomcat restart 
> and use the new code ?
>
> Or yet I have to update/refresh somehow Spring context/configuration ?
>
> <context:component-scan base-package="com.foo.controller" 
> use-default-filters="false"
> name-generator="org.apache.cocoon.rest.controller.ControllerBeanNameGenerator"
> scope-resolver="org.apache.cocoon.rest.controller.ControllerBeanScopeResolver">
>     <context:include-filter type="annotation" 
> expression="org.apache.cocoon.rest.controller.annotation.RESTController" 
> />
>   </context:component-scan>
>
> <context:annotation-config />
>
> I know its NOT a good practice to "hot deploy" such code on a 
> production servers but sometimes you just need fast update and cannot 
> restart app server or use some 3rd party tools like Live Rebel etc.
> I don't want to introduce a new block with the new controller in 
> cocoon app, because that would also be a valid option as i presume ?

Hi Greg,
given the constraints you define above, I would suggest to solve your 
problem at Tomcat level by empowering the "reloadable" attribute of 
classloaders [1].

In this way you don't need to modify anything at Cocoon level.

Regards.

[1] http://tomcat.apache.org/tomcat-7.0-doc/config/loader.html

-- 
Francesco Chicchiriccò

ASF Member, Apache Syncope PMC chair, Apache Cocoon PMC Member
http://people.apache.org/~ilgrosso/