[OAK-4640] Provide a way for commit hook to record meta data for a given commit

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.5.8, 1.6.0
• Component/s: core
• Assignee: Chetan Mehrotra
• Reporter: Chetan Mehrotra
• Created: 04/Aug/16 04:54
• Updated: 09/Dec/16 12:22
• Resolved: 05/Aug/16 10:50

Description

Currently as part of commit the caller can provide a CommitInfo instance which captures some metadata related to commit being performed. Note that CommitInfo instance passed to NodeStore is immutable.

For some usecases we need a way to add some more metadata to on going
commit from within the CommitHook

• OAK-4586 - Here we need to record nodetypes of nodes which got modified as part of current commit
• OAK-4412 - Here we want to generate Documents for modified nodestate (per index definition) and "attach" it to current commit

This meta information would later be used by Observer.

To enable such cases some mutable state needs to be exposed as part of CommitInfo which can be used by CommitHooks.

As per discussion of DL [1] this can be done by adding a new CommitAttributes instance which can be accessed from CommitInfo

[1] http://mail-archives.apache.org/mod_mbox/jackrabbit-oak-dev/201608.mbox/%3CCAHCW-mk%3DTMQ_q20dPSmdr7Q%3DcR8OfMDdJceDTd-pGs0pk_cK0g%40mail.gmail.com%3E

Issue Links

• blocks: OAK-4412 Lucene hybrid index
• blocks: OAK-4586 Collect affected node types on commit
• is related to: OAK-4651 Clarify equality contract for CommitInfo
• is related to: OAK-5257 Pass CommitContext as part of CommitInfo in OakInitializer