GitHub user grkvlt opened a pull request:
https://github.com/apache/brooklyn-server/pull/155
[WIP] Add DSL support for calling effectors in YAML
Adds a new DSL function `$brooklyn:effector` that takes two parameters, a
string with the effector name and an optional map of the named effector
arguments. Use in a blueprint wherever you can substitute a `$brooklyn`
function, like this:
```YAML
thing:
$brooklyn:entity("other").effector("findInformation")
stuff:
$brooklyn:effector:
- "getData"
- arg1: "value"
arg2: 3.14159d
arg3: $brooklyn:config("key")
```
See #153 for a complementary mechanism to create effectors in YAML directly.
### Issues
It is hard to determine when the effector will be executed, but lazy
evaluation can be effected by assigning the result of an `attributeWhenReady()`
call to one of the effector arguments. It may be useful to have a version of
the function that explicitly waits until some sensor has a specific value.
Different predicates could be defined for start conditions, or implicit or
explicit latches could be used. It would also be interesting to allow the tasks
created when running an effector to be used in places like the
`install.command` configuration of a `VanillaSoftwareProcess` in place of the
SSH command executing task. This would require a version of the function that
returned a `Task<?>` rather than a value directly, perhaps via another new
function like `$brooklyn:task()`?
Further work is still required to complete this feature, including more
tests and documentation.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/grkvlt/brooklyn-server dsl-effector
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/brooklyn-server/pull/155.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #155
----
commit 405c69bc65c274f60b7281b420003a71161599a9
Author: Andrew Donald Kennedy <[email protected]>
Date: 2016-05-23T22:31:13Z
Add DSL support for calling effectors in YAML
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