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From "Freeman Fang (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (CXF-5016) ArithmeticException on ResponseTimeCounterMBean.getAvgResponseTime() after counter reset()
Date Fri, 24 May 2013 00:22:20 GMT

     [ https://issues.apache.org/jira/browse/CXF-5016?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Freeman Fang reassigned CXF-5016:
---------------------------------

    Assignee: Freeman Fang
    
> ArithmeticException on ResponseTimeCounterMBean.getAvgResponseTime() after counter reset()
> ------------------------------------------------------------------------------------------
>
>                 Key: CXF-5016
>                 URL: https://issues.apache.org/jira/browse/CXF-5016
>             Project: CXF
>          Issue Type: Bug
>          Components: Management
>    Affects Versions: 2.7.0
>            Reporter: Emmanuel FOUCHE
>            Assignee: Freeman Fang
>            Priority: Minor
>
> A JMX client program such as monitoring platform (Nagios plugin, HypericHQ, ...) retrieve
metrics like AvgResponseTime per minute.
> One way to retrieve data is to fetch value every minute and reset counter immediately
after.
> However, if no calls to the service has been made since last reset, you get an ArithmeticException
"divide by zero" when calling ResponseTimeCounterMBean.getAvgResponseTime()
> I suggest handling this case by returning 0 or -1 instead, thus avoiding exception and
alarming stacktrace on the monitoring client side.
> {code:title=ResponseTimeCounter.getAvgResponseTime()}
> public Number getAvgResponseTime() {        
>   if (_invocations.get() == 0) {
>      return -1; // avoid divide by 0;
>   }
>   return (int)(totalHandlingTime / invocations.get());
> }
> {code}

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