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From "Tim Smith (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-1915) Add static openInput(File,...) methods to all FSDirectory implementations
Date Thu, 17 Sep 2009 14:16:57 GMT
Add static openInput(File,...) methods to all FSDirectory implementations
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                 Key: LUCENE-1915
                 URL: https://issues.apache.org/jira/browse/LUCENE-1915
             Project: Lucene - Java
          Issue Type: Wish
          Components: Store
            Reporter: Tim Smith


It would be really useful if NIOFSDirectory and MMapDirectory had static methods for opening
an input for arbitrary Files
SimpleFSDirectory should likewise have a static openInput(File) method in order to cover all
basis (right now, SimpleFSIndexInput only has protected access

This allows creating a custom FSDirectory implementation that can use any criteria desired
to determine what Input implementation to use for opening a file.

I know the FileSwitchDirectory provides some ability to do this, however that locks the selection
criteria down to only the file extension in use
also, the FileSwitchDirectory approach seems to want to have each directory at different paths
(as list() methods just cat the directory listings of the sub directories, which could cause
havoc if both sub directories point to the same FS path?)

opening up these static openInput() methods would allow creating a custom FS store implementation
that would could for instance mmap files of a particular type and size and use NIO for other
files, and mabye even use the SimpleFS input for a third category of files. Could also then
apply different buffer sizes to different files, perform RAM caching of particular inputs,
etc


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