Bug #58945 for POE-Component-MessageQueue: [patch] Use a hierarchy in FileSystem storage

Hello, We are using PoCo MQ at work and are regularly facing a problem with how it stores the messages body on the filesystem: if the consumer stops fetching messages for whatever reason (like a crash), the messages piles up, saturating the number of inodes in the storage directory. This makes PoCo MQ dies with a "no space left on device" error (in fact a "no inodes available", but it's the same errno). The attached patch implements a strategy similar to the one used in CPAN or in software with a similar problematic, by storing the messages in a hierarchy, in order to limit the number of consumed inodes per directory. For example msg-5ec41b0b-1fad-4ad6-a05e-c0f66aa27425.txt is now stored in $data_dir/5/5e/msg-5ec41b0b-1fad-4ad6-a05e-c0f66aa27425.txt The hierarchy depth can be controlled with the data_dir_depth attribute, which defaults to 2. The patch also adjusts the corresponding tests. -- Sébastien Aperghis-Tramoni Close the world, txEn eht nepO.