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https://issues.apache.org/jira/browse/FELIX-5952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16643281#comment-16643281
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Georg Henzler commented on FELIX-5952:
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The attached zip [^FELIX-5952-new-module-healthcheck-initial-version.zip] comes
with a mnew top level module "healthcheck" that contains the api and core
module as currently maintained by Sling ([1] and [2]). The following has been
adjusted:
* Removed deprecated methods like HealthCheckExecutor.execute(String... tags)
and using version 2.x.x for both maven and OSGi packages as starting point in
Felix now
* Added simple markdown documentation (slightly restructured and abbreviated,
will extend later)
* General cleanup (consistent formatting, imports, etc.)
* Minimised dependencies
** Removed JSON dependency and implemented the simple serialisation "manually"
(there is no one simple OSGi bundle to achieve that, geronimo-json_1.0_spec +
johnzon seems overkill for what is actually needed here)
** The module org.apache.sling.commons.threads is replaced by a standard java
executor (see
org.apache.felix.hc.core.impl.executor.HealthCheckExecutorThreadPool)
** The HC property "hc.async.cronExpression" is supported, but then requires
the bundle org.apache.servicemix.bundles.quartz to be present (as standard java
does not support cron expressions). If the quartz bundle is not available, a
warning is logged and the HC falls back to synchronous execution (however with
the standard caching mechanisms applied, hence not a problem)
** The HC property "hc.async.intervalInSec" can be used to schedule health
checks asynchronously without using quartz
** The dependency org.apache.sling.scripting.api is removed, the HC
ScriptableHealthCheck will remain in Sling (as it conceptionally makes sense to
use Sling Scripting only in Sling
[1] [https://github.com/apache/sling-org-apache-sling-hc-api]
[2] [https://github.com/apache/sling-org-apache-sling-hc-core]
> Felix Health Checks
> -------------------
>
> Key: FELIX-5952
> URL: https://issues.apache.org/jira/browse/FELIX-5952
> Project: Felix
> Issue Type: New Feature
> Reporter: Georg Henzler
> Priority: Major
> Attachments: FELIX-5952-new-module-healthcheck-initial-version.zip
>
>
> Sling Health Checks [1] allow to check a system's health manually (humans) or
> technically (load balancers, Kubernetes, etc.). Since Sling HCs have minimal
> dependencies to Sling, they should be brought to Felix to make them available
> to a broader audience and to to be able to use the executor runtime for the
> systemready checks - see [2] for the discussion on the Sling mailing list.
> [1]
> https://sling.apache.org/documentation/bundles/sling-health-check-tool.html
> [2]
> http://apache-sling.73963.n3.nabble.com/hackathon-health-checks-td4086283.html
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