forked from Baguette/dodb.cr
68 lines
1.5 KiB
Crystal
68 lines
1.5 KiB
Crystal
require "file_utils"
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require "json"
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require "./indexer.cr"
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class DODB::Partition(V) < DODB::Indexer(V)
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property name : String
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property key_proc : Proc(V, String)
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getter storage_root : String
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def initialize(@storage_root, @name, @key_proc)
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::Dir.mkdir_p get_partition_directory
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end
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def check!(key, value, old_value)
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return true # Partitions don’t have collisions or overloads.
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end
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def index(key, value)
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partition = key_proc.call value
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symlink = get_partition_symlink(partition, key)
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Dir.mkdir_p ::File.dirname symlink
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# FIXME: Should not happen anymore. Should we remove this?
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::File.delete symlink if ::File.exists? symlink
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::File.symlink get_data_symlink(key), symlink
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end
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def deindex(key, value)
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partition = key_proc.call value
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symlink = get_partition_symlink(partition, key)
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::File.delete symlink
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end
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def get(partition)
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r_value = Array(V).new
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partition_directory = get_partition_directory partition
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Dir.each_child partition_directory do |child|
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r_value << V.from_json ::File.read "#{partition_directory}/#{child}"
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end
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r_value
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end
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private def get_partition_directory
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"#{@storage_root}/partitions/by_#{@name}"
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end
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private def get_partition_directory(partition)
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"#{get_partition_directory}/#{partition}"
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end
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private def get_partition_symlink(partition : String, key : String)
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"#{get_partition_directory partition}/#{key}.json"
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end
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private def get_data_symlink(key : String)
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"../../../data/#{key}.json"
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end
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end
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