1DBM::Deep::Storage::FilUes(e3r)Contributed Perl DocumentDaBtMi:o:nDeep::Storage::File(3)
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NAME

6       DBM::Deep::Storage::File - mediate low-level interaction with storage
7       mechanism
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PURPOSE

10       This is an internal-use-only object for DBM::Deep. It mediates the low-
11       level interaction with the storage mechanism.
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13       Currently, the only storage mechanism supported is the file system.
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OVERVIEW

16       This class provides an abstraction to the storage mechanism so that the
17       Engine (the only class that uses this class) doesn't have to worry
18       about that.
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METHODS

21   new( \%args )
22   open()
23       This method opens the filehandle for the filename in " file ".
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25       There is no return value.
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27   close()
28       If the filehandle is opened, this will close it.
29
30       There is no return value.
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32   size()
33       This will return the size of the DB. If file_offset is set, this will
34       take that into account.
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36       NOTE: This function isn't used internally anywhere.
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38   set_inode()
39       This will set the inode value of the underlying file object.
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41       This is only needed to handle some obscure Win32 bugs. It really
42       shouldn't be needed outside this object.
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44       There is no return value.
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46   print_at( $offset, @data )
47       This takes an optional offset and some data to print.
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49        $offset , if defined, will be used to seek into the file. If
50       file_offset is set, it will be used as the zero location. If it is
51       undefined, no seeking will occur. Then,  @data  will be printed to the
52       current location.
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54       There is no return value.
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56   read_at( $offset, $length )
57       This takes an optional offset and a length.
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59        $offset , if defined, will be used to seek into the file. If
60       file_offset is set, it will be used as the zero location. If it is
61       undefined, no seeking will occur. Then,  $length  bytes will be read
62       from the current location.
63
64       The data read will be returned.
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66   DESTROY
67       When the ::Storage::File object goes out of scope, it will be closed.
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69   request_space( $size )
70       This takes a size and adds that much space to the DBM.
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72       This returns the offset for the new location.
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74   copy_stats( $target_filename )
75       This will take the stats for the current filehandle and apply them to
76       $target_filename . The stats copied are:
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78       •   Onwer UID and GID
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80       •   Permissions
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84perl v5.36.0                      2023-01-20       DBM::Deep::Storage::File(3)
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