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The various checkpointing function may be called when no env has been
loaded (yet), support this.
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Since TokyoCabinet does not provide a DB environment, trying to reopen
the same db multiple times (something that happens with subregistry
mostly, and possibly after rescans) causes the subsequent opens to fail
due to "threading errors".
Fix by implementing some sort of environmentalish database management
(only keeps track of open databases, returns existing ones if reopening
the same db multiple times, closes all of them on exit).
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Convert the (optional) first argument to #each*() methods to a string to
ensure the calls work as expected. This fixes a problem with
@registry.each not working as expected, and although it would have been
sufficient to convert the default for the first argument from nil to the
empty string, the approach implemented by this patch is more robust
overall.
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When using a DB backend different from BDB, the BDB constant may not be
defined, causing a NameError during error trapping in the main loop. Fix
this by defining our own DBFatal error that maps to BDB::Fatal in the
BDB case and is defined as an (unused) Exception for TokyoCabinet.
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When upgrading from 0.9.5 data, write the 0.9.9-style regisitry using
BDB still rather than trying to use TokyoCabinet already. This makes
sure that the next step (0.9.9 to modern times) works correctly.
(Moreover, the existing BDB-to-TC attempt wouldn't have worked anyway
due to wrong var names. I doubt anybody will ever hit this path and
notice though.)
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