perfsonar development work

[Guilherme Fernandes <>]

ulisses wrote:

> Hi all
>  
Hi!

> using the following xml sample as a base [0]:
>
>  <nmwg:metadata id="meta1-in" metadataIdRef="meta4">
>    <netutil:subject id="iusub1">
>      <nmwgt:interface>
>        <nmwgt:direction>out</nmwgt:direction>
>      </nmwgt:interface>
>    </netutil:subject>
>    <nmwg:eventType>utilization</nmwg:eventType>
>  </nmwg:metadata>
>
>
>  <nmwg:metadata id="meta2">
>    <select:subject id="iusub2" metadataIdRef="meta1-in"/>
>
>    <select:parameters id="param1">
>      <nmwg:parameter name="startTime">1121644800</nmwg:parameter>
>      <nmwg:parameter name="endTime">1121904000</nmwg:parameter>
>      <nmwg:parameter name="consolidationFunction">AVERAGE</nmwg:parameter>
>      <nmwg:parameter name="resolution">300</nmwg:parameter>
>    </select:parameters>
>
>    <nmwg:eventType>select</nmwg:eventType>
>
>  </nmwg:metadata>
>
> I see that the select element has a reference to metadata that describes an 
> xml document.
>
> In the topology service, it will be interesting for future versions to 
> retrieve only a a set of
> elements of the topology, for instance the links that have an specified 
> capacity.
>
> An example of link element is the follwing:
>
>         <nmwgtopo3:link  id="localhost.localdomain.-4b42ecf6:10d5e1bdbe3:-6b38" 
> xmlns:nmwgtopo3="http://ggf.org/ns/nmwg/topology/l3/3.0/";>
>            <nmwgtopo3:interface
>                id="localhost.localdomain.-4b42ecf6:10d5e1bdbe3:-6b39" 
> interfaceIdRef="51479">
>                <nmwgtopo3:ifDescription>FastEthernet0/0.2-ISL vLAN 
> subif</nmwgtopo3:ifDescription>
>                <nmwgtopo3:type>other</nmwgtopo3:type>
>                <nmwgtopo3:capacity>100000000</nmwgtopo3:capacity>
>                <nmwgtopo3:ipAddress value="158.38.108.1"/>
>            </nmwgtopo3:interface>
>            <nmwgtopo3:type>lan</nmwgtopo3:type>
>            <nmwgtopo3:name>levanger.levanger-fag</nmwgtopo3:name>
>        </nmwgtopo3:link>
>
>
> And a template of links that have interfaces with a capacity of 155 Mbps 
> could be [1]:
>
>     <nmwgtopo3:link>
>           <nmwgtopo3:interface>
>                       <nmwgtopo3:capacity>155000000</nmwgtopo3:capacity>
>            </nmwgtopo3:interface>
>    </nmwgtopo3:link>
>
> I don't have clear that I can specify such template inside a <select> 
> parameters so I believe
> that the correct way to indicate the template is like in the example [0], that is referencing a 
> metadata that has the template element [1]
>  
Although its not my field, and probably roman and others have much more 
to say about it, we did learn a lot about the SQL MA when developing its 
Owamp support, so maybe I can help. The select metadata is used to 
filter the data that is 'selected' from the SQL database. Right now it's 
use is hardcoded in SQLStorageManager and only checks for the Time, 
startTime and endTime values. Taking this aside, you're actually right 
in the way you should make the request to filter it by capacity. The 
difference is that it won't be filtered by the select metadata. The 
SQLStorageManager also does some filtering through your QueryGenerator, 
but it's done to the eXist database, not the SQL one. In the SQL MA 
eXist database the interfaces have their capacity defined and passing a 
capacity parameter in the referenced metadata (the one that defines what 
data you want from the SQL database) should filter the request so that 
only the right metadataIds will be used in the select for the SQL 
request. You can take a look at the 
measurementArchive.metadataConfig.queryGenerator.UtilizationQueryGenerator 
class, its the 'select' made to the eXist database.

Hope it helped,
 Guilherme Fernandes

> A full example could be:
>
>  <nmwg:metadata id="meta1">
>    <netutil:subject id="sub1">
>     <nmwgtopo3:link>
>           <nmwgtopo3:interface>
>                       <nmwgtopo3:capacity>155000000</nmwgtopo3:capacity>
>            </nmwgtopo3:interface>
>    </nmwgtopo3:link>
>    </netutil:subject>
>  </nmwg:metadata>
>
>  <nmwg:metadata id="meta2">
>    <select:subject id="sub2" metadataIdRef="meta1"/>
>
>    <select:parameters id="param1">
>      <nmwg:parameter name="Time">0</nmwg:parameter>
>    </select:parameters>
>
>    <nmwg:eventType>select</nmwg:eventType>
>
>  </nmwg:metadata>
>
>
> Am I right?
>
> Thanks so much
>
>         Ulisses
>