[SLING-3744] Schedule execution of HCs based on a crontab-like service property

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Health Check Core 1.1.2, Health Check samples 1.0.6
• Component/s: Health Check
• Assignee: Bertrand Delacretaz
• Reporter: Georg Henzler
• Created: 08/Jul/14 06:19
• Updated: 05/Sep/14 10:44
• Resolved: 30/Jul/14 13:58

Description

Make HCs sync/async behaviour configurable via service property "hc.async.cronExpression". This allows operations to decide whether a check should be run synchronously or asynchronously (e.g. could be different for TEST and PROD). For checks that always have to run asynchronously, it simplifies the implementation significantly (see org.apache.sling.hc.samples.impl.AsyncHealthCheckSample from patch).

The logic for registering/deregistering jobs for async HCs is in AsyncHealthCheckExecutor, HealthCheckExecutorImpl has only changed slightly in a way that it retrieves the results from AsyncHealthCheckExecutor for checks configured to be asynchronous.