Implement generic retry mechanism
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Key: SLING-2289
URL: https://issues.apache.org/jira/browse/SLING-2289
Project: Sling
Issue Type: New Feature
Components: Installer
Affects Versions: Installer Core 3.2.2
Reporter: Carsten Ziegeler
Assignee: Carsten Ziegeler
Fix For: Installer Core 3.2.4
Currently, if a task fails it is retried over and over again which basically is
kind of an endless loop.
However, if between two retries nothing has changed, it is most likely that a
retry is failing again. We have some basic code for bundle handling, but this
is a) tied to bundles, b) not reusable, and c) not working perfectly.
Instead we should come up with a generic mechanism for retries - a task should
signal that it want's to be retried. In addition we need a notification
mechanism which notifies the installer to retry something, e.g. a service
listening for bundle events would notify the installer each time a bundle event
has occurred etc.
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