Here is what we could do. The servlet statistics are #number of operations, mix/Max/TotalTime in miliseconds.
Neither of the operations is unlikely to ever exceed the range of an integer. Unlike longs, integer assignments are atomic. If we keep the statistics in a volatile int, we make sure different threads see the most current value, without the need to lock. We will miss a few updates, due to different threads overwriting their changes under high load, but they are only statistics, and transient by nature anyway. I did the same thing with JTA and EntityBean statistics.
we are looking for a point in the request/servlet where locking already occurs. If we find one we will add the stat update there, if not, maybe a volatile will do it....
Jules
Stefan
On Thursday, Feb 27, 2003, at 05:26 US/Pacific, Jules Gosnell wrote:
Stefan Reich wrote:
I tested JSR-77 support in 3.2 and noticed the following issues:
* EntityBeanStatsImpl: PooledCount shows up always as zero
* JTAStatsImpl: results are always zero because the TranactionManagerService doesn't register itself as an MBean
* JCAConnectionPoolStatsImpl: WaitingThreadCount probably not connected
* JCAStatsImpl: only lists default datasource
* JMSResource needs to be hooked up.
The following stats don't show up at all: JavaMail, JDBCStats, ServletStats and URLStats.
The ServletStats are currently not filled out because acquiring them will add a significant point of contention to each servlet.
We hope to have a solution soon.
Jules (Jetty Integrator)
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