Improve fragment merging
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Key: FELIX-1534
URL: https://issues.apache.org/jira/browse/FELIX-1534
Project: Felix
Issue Type: Improvement
Components: Framework
Affects Versions: felix-2.0.0
Reporter: Richard S. Hall
Fix For: felix-2.2.0
Currently, the framework attempts to merge fragments each time it is going to
resolve bundles. There are some drawbacks to this approach.
First, it is not good from a performance perspective. The framework keeps
re-merging all fragments on each resolve whether they are needed or not.
Second, since resolves happen in different places (e.g., when resolving a
bundle and when resolving a dynamic import) we have to remember to do the
merging in multiple places. This also creates a performance issue around
dynamic imports, which required a hack to avoid merging if not needed when
dynamically importing (see FELIX-1435).
The current approach doesn't actually clean up the merged fragments either,
which can lead to some issues too. However, we could potentially turn this into
a feature. Instead of the current approach, we could merge fragments as bundles
are installed. This would help with performance issues as well as consistency
issues (see again FELIX-1435).
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