Red Hat Summit Red Hat SummitSupportoConsoleSviluppatoriInizia una provaContatti

Questo contenuto non è disponibile nella lingua selezionata.

3. Getting Data for Single and Multiple Resources

When you run any sort of operation or function, you frequently have to pull the results from that operation, the data, into another function.
For example, this exports and writes whatever the results from the data variable was: 
exporter.write(data.get(0))
Copy to Clipboard Toggle word wrap
Using get(0) takes the first object that was returned and uses it.
There can be instances when there are a lot of objects returned that could potentially be used in the next step of the script, and there are a couple of different ways to handle it.
One option, instead of get(0), is to work incrementally through each object in a list. For example, this gets the data for each metric definition (i) for a resource.

Example 3. get(i)

if( mdefs != null ) {
  if( mdefs.size() > 1 ) {
     for( i =0; i < mdefs.size(); ++i) {
          mdef = mdefs.get(i);
          var data = MeasurementDataManager.findDataForResource(resources.get(0).id,[mdef.id],start,end,1)

	  exporter.write(data.get(0));
     }
  }
  ...8<...
Copy to Clipboard Toggle word wrap
Other objects can be sent to an array, and then the operation or task can be performed for each object in that array. This example searches for all JBoss AS 5 servers, sends the results to an array, and then performs a restart operation on each server.

Example 4. An Array

//find the resources
//use a plugin filter to make sure they are all of the same type
criteria = new ResourceCriteria();
criteria.addFilterPluginName('JBossAS5')

var resources = ResourceManager.findResourcesByCriteria(criteria).toArray();
var resType = ResourceTypeManager.getResourceTypeByNameAndPlugin('JBossAS Server', 'JBossAS5');

// go through the array
var idx=0;
var jbossServers = new Array();

for( i in resources ) {
     if( resources[i].resourceType.id == resType.id ) {
          jbossServers[idx] = resources[i];
          idx = idx + 1;     
     }
}

// restart the resources
for( a in resources ) {
     var jboss = ProxyFactory.getResource(jbossServers[a].id);
     jboss.restart()
}
Copy to Clipboard Toggle word wrap
The util.js support script has a foreach function that also iterates cleanly through arrays, collections, and maps, as well as generic objects.
Which method you use to handle multiple objects — or whether you even want to handle multiple objects — depends on the type of information and the purpose of the script. These are just some options to keep in mind.
Torna in cima
Red Hat logoGithubredditYoutubeTwitter

Formazione

Prova, acquista e vendi

Community

Informazioni sulla documentazione di Red Hat

Aiutiamo gli utenti Red Hat a innovarsi e raggiungere i propri obiettivi con i nostri prodotti e servizi grazie a contenuti di cui possono fidarsi. Esplora i nostri ultimi aggiornamenti.

Rendiamo l’open source più inclusivo

Red Hat si impegna a sostituire il linguaggio problematico nel codice, nella documentazione e nelle proprietà web. Per maggiori dettagli, visita il Blog di Red Hat.

Informazioni su Red Hat

Forniamo soluzioni consolidate che rendono più semplice per le aziende lavorare su piattaforme e ambienti diversi, dal datacenter centrale all'edge della rete.

Theme

© 2025 Red Hat