[Framework] Use single file per bundle in bundle cache by default
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Key: FELIX-3125
URL: https://issues.apache.org/jira/browse/FELIX-3125
Project: Felix
Issue Type: Improvement
Components: Framework
Affects Versions: framework-3.2.2
Reporter: Richard S. Hall
Assignee: Richard S. Hall
Priority: Minor
Fix For: framework-4.0.0
FELIX-2654 modified the bundle cache so it would use a single file per bundle
to store bundle-related state (e.g., location, persisted state, etc.). The main
reason was to reduce the amount of I/O performed during framework startup when
you have lots of already cached bundles. This feature was disabled by default,
since it didn't seem proper to introduce it in a micro release when it would
result in bundle caches not being backward compatible with previous micro
releases of 3.0.x.
WIth the coming framework 4.0 release, we should switch this to be the default.
Which means that new bundle caches created on 4.0 will not work with older
releases. However, bundle caches created with older releases will be seamlessly
converted by 4.0. Older caches will be converted non-destructively, so it is
possible to go back, but if changes are made while running 4.0 on an older
cache, then it is possible that they will get out of sync and will potentially
no longer be backward compatible.
For the foreseeable future, we can keep the felix.cache.singlebundlefile
property which allows you to revert to the old behavior if you so choose. At
some point in the future, though, it would be desirable to eliminate this
property too and only support the new cache format.
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