lib/picky/backends/file/basic.rb in picky-3.1.0 vs lib/picky/backends/file/basic.rb in picky-3.1.1

@@ -1,108 +1,38 @@
 module Picky
 
   module Backends
 
-    # Handles all aspects of index files, such as dumping/loading.
-    #
-    module File
+    class File
 
-      # Base class for all index files.
+      # Base class for all file-based index files.
       #
       # Provides necessary helper methods for its
       # subclasses.
       # Not directly useable, as it does not provide
       # dump/load methods.
       #
       class Basic
 
-        # This file's location.
-        #
-        attr_reader :cache_path
+        attr_reader :cache_path,  # This index file's location.
+                    :mapping_file # The index file's mapping file (loaded into memory for quick access).
 
         # An index cache takes a path, without file extension,
         # which will be provided by the subclasses.
         #
         def initialize cache_path
-          @cache_path = "#{cache_path}.#{extension}"
+          @cache_path = "#{cache_path}.file.#{extension}"
+
+          # This is the mapping file with the in-memory hash for the
+          # file position/offset mappings.
+          #
+          @mapping_file = Memory::JSON.new "#{cache_path}.file_mapping.#{extension}"
         end
 
         # The default extension for index files is "index".
         #
         def extension
           :index
-        end
-
-        # Will copy the index file to a location that
-        # is in a directory named "backup" right under
-        # the directory the index file is in.
-        #
-        def backup
-          prepare_backup backup_directory
-          FileUtils.cp cache_path, target, verbose: true
-        end
-
-        # The backup directory of this file.
-        # Equal to the file's dirname plus /backup
-        #
-
-        def backup_directory
-          ::File.join ::File.dirname(cache_path), 'backup'
-        end
-
-        # Prepares the backup directory for the file.
-        #
-        def prepare_backup target
-          FileUtils.mkdir target unless Dir.exists?(target)
-        end
-
-        # Copies the file from its backup location back
-        # to the original location.
-        #
-        def restore
-          FileUtils.cp backup_file_path_of(cache_path), cache_path, verbose: true
-        end
-
-        # The backup filename.
-        #
-        def backup_file_path_of path
-          dir, name = ::File.split path
-          ::File.join dir, 'backup', name
-        end
-
-        # Deletes the file.
-        #
-        def delete
-          `rm -Rf #{cache_path}`
-        end
-
-        # Checks.
-        #
-
-        # Is this cache file suspiciously small?
-        # (less than 8 Bytes of size)
-        #
-        def cache_small?
-          size_of(cache_path) < 8
-        end
-        # Is the cache ok? (existing and larger than
-        # zero Bytes in size)
-        #
-        # A small cache is still ok.
-        #
-        def cache_ok?
-          size_of(cache_path) > 0
-        end
-        # Extracts the size of the file in Bytes.
-        #
-        def size_of path
-          `ls -l #{path} | awk '{print $5}'`.to_i
-        end
-
-        #
-        #
-        def to_s
-          "#{self.class}(#{cache_path})"
         end
 
       end
 
     end
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