Bruno Roustant created SOLR-15060:
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Summary: Introduce DelegatingDirectoryFactory
Key: SOLR-15060
URL: https://issues.apache.org/jira/browse/SOLR-15060
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Bruno Roustant
Assignee: Bruno Roustant
FilterDirectory already exists to delegate to a Directory, but there is no
delegating DirectoryFactory.
+Use cases:+
A DelegatingDirectoryFactory could be used in SOLR-15051 to make
BlobDirectoryFactory easily delegate to any DirectoryFactory (e.g.
MMapDirectoryFactory). If the DelegatingDirectoryFactory delegation can be
configured in solrconfig.xml then it allows any user to change the delegate
DirectoryFactory without code.
A DelegatingDirectoryFactory could be used by an EncryptingDirectoryFactory
that could encrypt/decrypt any delegate DirectoryFactory. Here again it should
be configurable in solrconfig.xml.
+Problem:
+But currently DirectoryFactory delegation does not work with a delegate
CachingDirectoryFactory because the get() method creates internally a Directory
instance of a type which cannot be controlled by the caller (the
DelegatingDirectoryFactory).
+Proposal:+
So here we propose to change DirectoryFactory.get() method by adding a fourth
parameter Function<Directory, Directory> that allows the caller to wrap the
internal Directory with a custom FilterDirectory when it is created.
+Benefit:
+Hence we would have a DelegatingDirectoryFactory that could delegate the
creation of some FilterDirectory.
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