i have a class called Event which has the following members { name, source, timestamp } with getters ,setters and constructor. i have a rule file which creates Event objects whenever a file is added / deleted in a particular folder. the rule file is as follows

rule "new file"
when
$p: RuleContext( $old : getOldContext().getContainedFiles(), $new :getNewContext().getContainedFiles())
RuleContext( $old != $new)
accumulate( $s : Object( this not memberOf $old ) from $new, $plus : collectList( $s ) )  
events : Object() from $plus;
then
Event event = new Event("new file added",$p.getOldContext().getParent(),new Date());
end


rule " file deleted"
when
$p: RuleContext( $old : getOldContext().getContainedFiles(), $new:getNewContext().getContainedFiles())
RuleContext( $old != $new)
accumulate( $t : Object( this not memberOf $new ) from $old, $mins : collectList( $t ) )
events : Object() from $mins; 
then
Event event = new Event("file deleted",$p.getOldContext().getParent(),new Date());
end 

(do not confuse with RuleContext and other unknown identifiers.. they r just related with other classes in the project.. these two rules just works fine )..i need to use a sliding time window and create another event if the number of file additions are > 5 over the past 1 minute. my rule file is :

declare Event 
@role( event ) 
end 


rule "More than 5 additions"
when     
Number(intValue > 5) 
from    accumulate( $tick : Event ( name == "new file added" ) over window:time( 1m ),
        count( $tick ) ) )
then 
    System.out.println("too many additions"); 
end 

i have enabled stream mode processing too.. but it doesnt seem to work. what could be the problem?