Re: [thredds] The IOSP interface has a new method (reacquire); how to implement?

• To: John Caron <caron@xxxxxxxx>
• Subject: Re: [thredds] The IOSP interface has a new method (reacquire); how to implement?
• From: Roland Schweitzer - NOAA Affiliate <roland.schweitzer@xxxxxxxx>
• Date: Fri, 31 Jul 2015 11:07:48 -0500

Ok. The problem reported in the original email is that the IOSP was plugged
into a new THREDDS server without the implementation (albeit no-op
implementation) in my code. I've added these as no-op methods.

Roland

On Thu, Jul 30, 2015 at 5:06 PM, John Caron <caron@xxxxxxxx> wrote:

> Hi Roland:
>
> Sorry I forgot about this. Heres a bit more info.
>
> The idea is that we can want to cache the NetcdfFile objects in memory.
> Previously, our ability to cache was limited by the IOSP holding on to
> finite system resources like file handles. So typical use case is for the
> IOSP to close its file on release() and to reopen it on acquire(). Probably
> safe for you to implement as NOOPs.
>
> /**
>  * Release any system resources like file handles.
>  * Optional, implement only if you are able to reacquire.
>  * Used when object is made inactive in cache.
>  * @throws IOException
>  */
> void release() throws IOException;
>
> /**
>  * Reacquire any resources like file handles
>  * Used when reactivating in cache.
>  * @throws IOException
>  */
> void reacquire() throws IOException;
>
>
> On Thu, Jul 30, 2015 at 9:10 AM, Roland Schweitzer - NOAA Affiliate <
> roland.schweitzer@xxxxxxxx> wrote:
>
>> I have an IOSP that I plug in to TDS. It has served us well for many
>> years. With the latest TDS our ISOP fails half the time because TDS calls
>> the new reacquire method for which we have no implementation.
>>
>> Error {
>>     code = 500;
>>     message = "gov.noaa.pmel.tmap.iosp.FerretIOServiceProvider.reacquire()V";
>> };
>>
>>
>> I have no clue what the methods is supposed to do or how to implement it.
>>
>> Can somebody please add some information the Java doc about this method
>> to explain how this should be implemented?
>>
>>
>> http://www.unidata.ucar.edu/software/thredds/current/netcdf-java/javadocAll/index.html
>>
>> Thanks,
>> Roland
>>
>> _______________________________________________
>> thredds mailing list
>> thredds@xxxxxxxxxxxxxxxx
>> For list information or to unsubscribe,  visit:
>> http://www.unidata.ucar.edu/mailing_lists/
>>
>
>

• References:
  • [thredds] The IOSP interface has a new method (reacquire); how to implement?
    • From: Roland Schweitzer - NOAA Affiliate
  • Re: [thredds] The IOSP interface has a new method (reacquire); how to implement?
    • From: John Caron