[jboss-jira] [JBoss JIRA] (JBRULES-2640) Implement support for group-by (if an explicit construct is necessary) and distinct

[Matteo Mortari (JIRA)]

    [ https://issues.jboss.org/browse/JBRULES-2640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13040076#comment-13040076 ] 

Matteo Mortari commented on JBRULES-2640:
-----------------------------------------

Is this a {{group-by}} intended to be in conjunction with {{accumulate}} ?

IFF so, normally I try to normalize it as per the below example; possibly doesn't cover all possibly use-case, but I thought maybe could be helpful in the time being.
{{
declare GroupByString
	groupId : String
	groups : String[]
end

rule "init Metro hash of my interest"
no-loop
when
then
	GroupByString grp = new GroupByString();
	grp.setGroupId("metroHash");
	grp.setGroups(new String[]{"#M1", "#M2"});
	insert(grp);
end

// Remember see JSON 'in_reply_to_user_id' if null actually will be -1 by convention of method getLong(String str) of Maven-Central / org.twitter4j / twitter4j-core / 3.0.5 / twitter4j.internal.json.z_T4JInternalParseUtil
rule "Multiple tweets about a metro line hash"
no-loop
when
	$group : GroupByString( groupId == "metroHash")
	$metroHash : String() from $group.groups
	accumulate ( $tweet : Status( text contains $metroHash, inReplyToUserId == -1 ) over window:time( 5m ) ;
				 $list : collectList( $tweet ),
				 $count : count( $tweet );
				 $count >= 2
				 )
	not Alert( condition == "Multiple tweets about a metro line hash "+$metroHash ) over window:time( 5m ) 				 
then
	Status[] theTweets = new Status[$list.size()];
	$list.toArray(theTweets); // TODO check: I've tried more concise one-liner syntax but fail KB compilation.
	Alert<Status[]> alert = new Alert<Status[]>(sessionCurrentTime(kcontext),
													"Multiple tweets about a metro line hash "+$metroHash,	
													AlertType.INFO,
													theTweets);
	insert(alert);
	LOG.info("Multiple tweets for " + $metroHash + " count " + $count + " list: " + $list);
end
}}

> Implement support for group-by (if an explicit construct is necessary) and distinct
> -----------------------------------------------------------------------------------
>
>                 Key: JBRULES-2640
>                 URL: https://issues.jboss.org/browse/JBRULES-2640
>             Project: JBRULES
>          Issue Type: Feature Request
>          Components: All
>    Affects Versions: 5.1.0.FINAL
>            Reporter: Edson Tirelli
>            Assignee: Edson Tirelli
>              Labels: fusion_roadmap
>             Fix For: FUTURE
>
>
> Implement support for group-by (if an explicit construct is necessary) and distinct



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