CAS follows the below release strategy in determining the kinds of changes different releases can accommodate and how lines of development are managed. CAS adopters can also expect the following for each release type. All new improvements, fixes, enhancements, and changes are weighed against the release strategy for consideration in future release.
It is in your best interest to try and avoid making changes to the internals of the CAS software, to make future upgrades relatively easy and painless. The more you modify the inner workings of CAS to implement and deliver custom use cases, the more trouble it would be for the deployment down the road as you would face configuration and API changes. Being a single parent is tough, so avoid carrying the maintenance burden solely on your own. Consider discussing and sharing use cases with the community and contribute changes back so as to let your deployment simply become a consumer, and not an owner, of such changes down the road.
Security releases are a critical minimal change on a release to address a serious confirmed
security issue. That is,
188.8.131.52 would be
2.5.0 with a minimal change to patch a vulnerability.
All adopters are strongly urged to upgrade to a SECURITY releases as soon as possible.
CAS overlays should build with no changes, unless required and highlighted in the release notes.
A conservative incremental improvement that includes bug fixes, enhancements and new features
and is absolutely backward compatible with previous PATCH releases of the same
MINOR release. (i.e.
2.4.15 is a drop in replacement for
Adopters can expect that major APIs, integration points, default behavior, and general
configuration is mostly the same. CAS overlays should build with little to no changes,
unless required and highlighted in the release notes and change logs.
An evolutionary incremental improvement that includes all PATCH release improvements
along with fixes and enhancements that could not easily be accommodated without
breaking backward compatibility or changing default behavior. (i.e. Transitioning from
Adopters can expect general improvements that require moderate changes in APIs, integration points,
default behavior, and general configuration. Overall the CAS server code along the MINOR
development line looks pretty much the same from release to release with clear moderate evolutionary
changes. FEATURE releases may have a theme or focus that helps coordinate development.
CAS overlays may require minor to moderate changes, some APIs may have changed or
been deprecated, default behavior and configuration may have changed.
While implementation APIs may change, CAS Core APIs
will remain unchanged between FEATURE release versions.
A revolutionary change accommodating sweeping architecture, approach, and
implementation changes. (i.e. Transitioning from
Significant changes in APIs, default behavior, and configuration can be expected.
Overlays may require significant changes and possibly a complete reworking.
Overall the CAS server code line may looked markedly different and integration
points may require reworking.