New subject: [xwiki-users] groovy notification

21 Nov 2008

Hi,

See below

Dan Svoboda wrote:
...
  Hi,

 I'm trying to use the notification system to trigger the sending of
 email whenever a comment is added to a blog article. I'm patterning my
 groovy class after the pircbot example on the xwiki snippets site.

 My system is xwiki workspaces as a virtual xwiki under xem. The
 platform version is 1.5.2.

 Here's my groovy class (XWSNotify.BlogMailNotificationGroovyClass):

 /* Groovy Class #* */

 import com.xpn.xwiki.api.XWiki;
 import com.xpn.xwiki.XWikiContext;
 import com.xpn.xwiki.notify.XWikiDocChangeNotificationInterface;
 import com.xpn.xwiki.notify.DocObjectChangedRule;
 import com.xpn.xwiki.notify.XWikiNotificationRule;
 import com.xpn.xwiki.doc.XWikiDocument;

 public class BlogMailNotificationGroovyClass implements \

 XWikiDocChangeNotificationInterface

 {
     def xwiki;
     def rule;
     def name;

     public void initClasses(XWikiContext context)
     {
         this.xwiki = context.getWiki();
         // listen to notifications
         this.rule = DocObjectChangedRule(this);

 context.getWiki().getNotificationManager().addGeneralRule(rule);
     }

     public void notify(XWikiNotificationRule rule, XWikiDocument
 newdoc, \
                        XWikiDocument olddoc, int event, XWikiContext
 context)
     {
         def length = newdoc.getSpace().length();
         def lastFour = length - 4;
         if(newdoc.getSpace().substring(lastFour) == "Blog") {

         def ms = xwiki.getPlugin("mailsender");
         def nb = ms.sendHtmlMessage(context.getUser(), &quot;myAddress(a)myHost.org
 ", \
                            context.get("ccrecipients"),
 context.get("bccrecipients"), \
                            context.get("subject"),
 newdoc.getRenderedContent(), \
                            newdoc.getContent(),
 newdoc.getAttachments());
         }
     }
 }

 /* *# */

 Here's a velocity script I'm using to initialize/test:

 #set($sc =  
 $context.getContext().getEngineContext().getServletContext())
 $sc.getAttribute("blgmailnotif")<br/>
 #set($blgmlnotif =
 $ 
 xwiki 
 .parseGroovyFromPage("XWSNotify.BlogMailNotificationGroovyClass"))
 #set($ok = $sc.setAttribute("blgmailnotif", $blgmlnotif))
 #set($blgmailnotif = $sc.getAttribute("blgmailnotif"))
 $sc.getAttribute("blgmailnotif")<br/>
 #set($ok = $blgmlnotif.initClasses($context))
 #set($ok = $blgmlnotif.notify($blgmlnotif.rule,$newdoc,$newdoc,
 3,$context))

 Here's the output from the velocity script:

 BlogMailNotificationGroovyClass@68e4a47
 BlogMailNotificationGroovyClass@3c401d45

 So, the groovy class gets initialized to a new reference successfully
 each time parseGroovyFromPage is called.

 Here's what appears in the log after running the velocity script:

 [ERROR] Left side ($request.title) of '!=' operation has null value.
 Operation not possible.  [line 53, column 43]
 [WARNING] Cannot retrieve method notify from object of class
 BlogMailNotificationGroovyClass due to security restrictions.

 If I alter the velocity script to:

 #set($sc =  
 $context.getContext().getEngineContext().getServletContext())
 $sc.getAttribute("blgmailnotif")<br/>

 Here's what appears in the log:

 [ERROR] Left side ($request.title) of '!=' operation has null value.
 Operation not possible.  [line 53, column 43]

 So, the [WARNING] is the only log entry pertaining to the groovy  
 class.

 If I add a comment to a Blog article (with or without the
 BlogMailNotificationGroovyClass initialized), the following appears in
 the log:

 [ERROR] Left side ($index) of addition operation has null value.
 Operation not possible.  [line 20, column 25]
 [ERROR] Left side ($index) of addition operation has null value.
 Operation not possible.  [line 20, column 25]
 [ERROR] Left side ($index) of addition operation has null value.
 Operation not possible.  [line 20, column 25]
 [ERROR] Left side ($index) of addition operation has null value.
 Operation not possible.  [line 20, column 25]
 [ERROR] Left side ($index) of addition operation has null value.
 Operation not possible.  [line 20, column 25]
 [ERROR] Left side ($index) of addition operation has null value.
 Operation not possible.  [line 20, column 25]
 [ERROR] Left side ($index) of addition operation has null value.
 Operation not possible.  [line 20, column 25]
 [ERROR] Left side ($index) of addition operation has null value.
 Operation not possible.  [line 20, column 25]
 [ERROR] Left side ($index) of addition operation has null value.
 Operation not possible.  [line 20, column 25]

 The number of lines corresponds to the number of comments present in
 the Blog article. There's nothing in the log pertaining to the groovy
 class. 
Indeed, this has nothing to do with your groovy notification. This is
generated by the velocity engine.
Is your skin customized ? Is the blog application modified ? (The log
says that somewhere a variable $index is trying to add something to
"null". Might be the pagination of blog articles ?)

Jerome.

I can't find a variable $index in any arithmetical expression in any  
velocity script anywhere on the site.

The skin is customized only to the extent of some inconsequential  
tweaks. Same with blog app.

There's no pagination of blog articles.

Would someone please review the basic mechanics of how groovy classes  
work, particularly as it pertains to my notification class?

Also, I see by reading source that there's a newer way of monitoring  
events through the "observation manager". Would someone please review  
how to use this system?

Thanks,

Dan

Re: [xwiki-users] groovy notification