I love learning things, and this was no exception.
First of all, a minor clarification:
perl is smarter than me, in fact much to my consternation it's sometimes just darn clever (didn't it read Damian's book?). IAC, File::Glob does not get loaded at runtime. The compiler apparently notices you used <*> or glob() and loads File::Glob at compile time. So my solution of wrapping our glob() calls in an eval{} woulod not work.
So I had to fight clever with clever. I'm sure this can be improved, so I'd love commentary. Here's the setup:
Module A uses Module B
Module B has glob() calls
So I went into Module A and removed the use Module B; and
replaced it with this:
BEGIN {
# Module B was failing to compile on a very random schedule. The
# failure was actually on Windows only, and had to do with the
# perl compiler seeing use of the glob() function, and
# proceeding to load the File::Glob module, including the
# File::Glob.dll. In some very rare occurrances, it
# would fail, claiming the .dll was not valid.
#
# Since this was a compile time failure, we needed to find a
# clever way to catch it unfortunately. This might just work.
#
# Try 5 times to load the module
my $retry = 5;
my $succeed = 0;
while ( $retry-- > 0 ) {
eval {
require ModuleB;
import ModuleB;
};
if ( $@ ) {
# Print an error it if failed
print "INTERNAL ERROR: ModuleB failed to compile. Retrying\n"
+;
# Delete the key from the %INC hash, otherwise it
# will refuse to try to reload it again
delete $INC{ 'ModuleB.pm' };
# Undef the whole darn namespace, to avoid any errors
# about redefining things in the namespace
undef %ModuleB:: ;
} else {
$retry = 0;
$succeed = 1;
}
}
# If it never loaded, bail for good.
if ( $succeed == 0 ) {
require Carp;
Carp::croak("Failed to load ModuleB: $@\n");
}
}
Some limited testing done by forcing a croak() in ModuleB on the first 4 attempts shows it seems to work. We'll see in production use!
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