[rules-users] no-loop & lock-on-active clarification

[techy]

I tried following rules as given below and result  are:(assumes facts which
I tried are qualified for both rules)

1. when lock-on-active used with both rule, only rule "1 precondition" got
executed for all facts.
2. when no-loop used with both rules, infinite loop
3. when lock-on-active for rule "1 precondition" and no-loop for rule "1
main condition" used, both rule got fired correctly.
4. for vice versa of 3 scenario, only rule "1 precondition" got executed for
all facts. 
Can someone please clarify about this scenario and also diff between no-loop
& lock-on-active? when we should use one and when should not?
I went thru documentation and still could not understand the difference.

public class Foo
{
    private Set<String> preConditionPassedRules ;
   
    private Integer f1;
    private Integer f2;
    
}

rule "1 precondition"
	salience 100
       
	when
		foo : Foo( f1 != null && f2 != null)
	then 
		foo.addPreconditionPassedRule("1 precondition");
                update(foo)
		
end

rule "1 main condition"
	salience 100
        
	when
		foo : Foo( preconditionPassedRule contains "1 precondition",f1 > 1000,f2 
< 1000)
	then 
		#actions
		
end

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