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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