Thanks all for all your help.
For the record, what finally worked is:
- type: org.apache.brooklyn.enricher.stock.Transformer
brooklyn.config:
enricher.sourceSensor: $brooklyn:sensor("cluster.first.entity")
enricher.targetSensor: $brooklyn:sensor("cluster_first_host")
enricher.targetValue:
$brooklyn:entity($brooklyn:attributeWhenReady("cluster.first.entity")).attributeWhenReady("host.name")
Graham
From: Aled Sage <[email protected]>
To: [email protected]
Date: 03/23/2017 07:47 AM
Subject: Re: Trouble with YAML Transformer
Hi Graham, Mike, all,
Graham: for why your transformer isn't populating the sensor value, see
the explanation I've written up at
https://issues.apache.org/jira/browse/BROOKLYN-458.
For a workaround, see my first comment on that jira issue:
https://issues.apache.org/jira/browse/BROOKLYN-458?focusedCommentId=15938141&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15938141
---
For the single-arg `$brooklyn:sensor(...)`...
`$brooklyn:sensor("cluster.first.entity")` returns a new
`AttributeSensor<Object>` instance, with name "cluster.first.entity". It
doesn't look up the actual value of the sensor on the entity.
What it means by "the given sensor on the current entity if found" is
that: if the entity declares a strongly typed sensor with exactly that
name (e.g. that also has a description and/or a type that is not
Object), then it will be the entity's own sensor instance returned
rather than constructing a new instance.
---
Mike: as discussed with you offline, the error for:
$brooklyn:sensor("cluster.first.entity").attributeWhenReady("host.name")
is reported at https://issues.apache.org/jira/browse/BROOKLYN-454, along
with a workaround.
The workaround is to use:
$brooklyn:entity($brooklyn:sensor("cluster.first.entity")).attributeWhenReady("host.name")
---
For the record, Mike also hit
https://issues.apache.org/jira/browse/BROOKLYN-457 while exploring
possible solutions for Graham's use-case.
---
Mike, could you please see what Brooklyn docs we can improve to make
this clearer, and easier to use/understand? Also what should we improve
to make investigating/debugging such problems easier?
Aled
On 22/03/2017 20:52, Graham Ashby wrote:
> And if I try:
>
> enricher.targetValue:
> $brooklyn:sensor("cluster.first.entity").attributeWhenReady("host.name")
>
> I get the error:
>
> Error evaluating node (rethrowing)
>
'$brooklyn:sensor("cluster.first.entity").attributeWhenReady("host.name")':
> java.lang.IllegalArgumentException: No such function
'attributeWhenReady'
> on sensor("cluster.first.entity")
>
>
>
> From: Mike Zaccardo <[email protected]>
> To: [email protected]
> Date: 03/22/2017 04:31 PM
> Subject: Re: Trouble with YAML Transformer
>
>
>
> From the DSL spec [
>
https://docs.cloudsoft.io/blueprints/syntax-yaml-reference.html#dsl-commands
>
> ]:
>
> * $brooklyn:sensor("sensor.name") returns the given sensor on the
current
> entity if found, or an untyped (Object) sensor;
>
> * $brooklyn:sensor("com.acme.brooklyn.ContainingEntityClass",
> "sensor.name")
> returns the strongly typed sensor defined in the given class
>
> Based on that, it seemed to me that the first, single-argument value
would
> actually return the value of the sensor (the "object"), not the sensor
> construct itself (the "class"). However, I tried updating your code and
> ended up with an empty-valued sensor.
>
> brooklyn.enrichers:
> - type: org.apache.brooklyn.enricher.stock.Transformer
> brooklyn.config:
> enricher.sourceSensor:
> $brooklyn:sensor("cluster.first.entity")
> enricher.targetSensor:
$brooklyn:sensor("cluster_first_host")
> enricher.targetValue:
> $brooklyn:formatString:
> - "%s"
> -
> $brooklyn:sensor("cluster.first.entity").attributeWhenReady("host.name")
>
> I'd like to kick the question to the rest of the community -- why does
> that
> ^ end up with an empty value? It should default to searching the current
> entity, which is a `DynamicCluster`, which has a `cluster.first.entity`.
>
> -Mike
>
> On Wed, Mar 22, 2017 at 12:52 PM Graham Ashby <[email protected]>
> wrote:
>
> OK, Stupid mistake.
> So, when I changed it to colon, I got the error:
> 2017-03-22 15:41:43,612 WARN o.a.b.c.b.s.d.BrooklynDslInterpreter
> [brooklyn-jetty-server-8081-qtp434786215-42]: Error evaluating node
> (rethrowing) '$brooklyn:sensor("org.apache.brooklyn.api.entity.Entity",
> "cluster.first.entity").attributeWhenReady("host.name")':
> org.apache.brooklyn.util.exceptions.PropagatedRuntimeException: Sensor
> cluster.first.entity not found on class
> org.apache.brooklyn.api.entity.Entity
>
> So I changed the Cast:
>
> enricher.targetValue:
> $brooklyn:sensor("org.apache.brooklyn.entity.group.AbstractGroup",
> "cluster.first.entity").attributeWhenReady("host.name")
>
> Now I get:
>
> 2017-03-22 15:43:50,909 WARN o.a.b.c.b.s.d.BrooklynDslInterpreter
> [brooklyn-jetty-server-8081-qtp434786215-2217]: Error evaluating node
> (rethrowing)
> '$brooklyn:sensor("org.apache.brooklyn.entity.group.AbstractGroup",
> "cluster.first.entity").attributeWhenReady("host.name")':
> java.lang.IllegalArgumentException: Not permitted to invoke function on
> 'class org.apache.brooklyn.core.sensor.BasicAttributeSensor' (outside
> allowed package scope)
>
> Thanks
> G
>
>
>
> From: Mike Zaccardo <[email protected]>
> To: Brooklyn dev <[email protected]>
> Date: 03/22/2017 03:30 PM
> Subject: Re: Trouble with YAML Transformer
>
>
>
> Hi Graham,
>
> In your `enricher.targetValue` -- `$brooklyn.sensor` should be
> `$brooklyn:sensor`
> (the dot replaced by a colon).
>
> If that does not solve it, try providing the `enricher.targetValue` with
> string, like so:
>
> brooklyn.enrichers:
> - type: org.apache.brooklyn.enricher.stock.Transformer
> brooklyn.config:
> enricher.sourceSensor:
$brooklyn:sensor("cluster.first.entity")
> enricher.targetSensor: $brooklyn:sensor("cluster_first_host")
> enricher.targetValue:
> $brooklyn:formatString:
> - "%s"
> -
> $brooklyn:sensor("org.apache.brooklyn.api.entity.Entity",
> "cluster.first.entity").attributeWhenReady("
> host.name")
>
> I hope this helps.
>
> Cheers,
> Mike
>
> On Wed, Mar 22, 2017 at 12:10 PM Graham Ashby <[email protected]>
> wrote:
>
> What I want is an attribute that I can include in a template.
> I'm trying to get the host.name of the first entity in the cluster, so
> what I've got is:
>
> brooklyn.enrichers:
> - type: org.apache.brooklyn.enricher.stock.Transformer
> brooklyn.config:
> enricher.sourceSensor:
$brooklyn:sensor("cluster.first.entity")
> enricher.targetSensor: $brooklyn:sensor("cluster_first_host")
> enricher.targetValue:
> $brooklyn.sensor("org.apache.brooklyn.api.entity.Entity",
> "cluster.first.entity").attributeWhenReady("host.name")
>
> But I get the literal value
> "$brooklyn.sensor("org.apache.brooklyn.api.entity.Entity",
> "cluster.first.entity").attributeWhenReady("host.name")"
>
> So, what am I doing wrong?
>
> Thanks
> Graham
>
> --
>
> Mike Zaccardo
>
> Senior Software Engineer
>
> Skype: mike.cloudsoft
>
> Twitter: @ItsMeMikeZ <https://twitter.com/ItsMeMikeZ> LinkedIn:
> linkedin.com/in/mike-zaccardo
> <https://www.linkedin.com/in/mike-zaccardo-aa3ab812>
>
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>
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