DODB.no_index, Storage#new_nilable_index.
The APIs are still a bit experimental at this point, but the feature is very likely to stay.
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@ -76,6 +76,12 @@ class DODB::DataBase(V)
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end
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end
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def new_nilable_index(name : String, &block : Proc(V, String | DODB::NoIndex))
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Index(V).new(self, @directory_name, name, block).tap do |indexer|
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@indexers << indexer
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end
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end
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def new_tags(name : String, &block : Proc(V, Array(String)))
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Tags(V).new(@directory_name, name, block).tap do |tags|
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@indexers << tags
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@ -6,7 +6,7 @@ require "./indexer.cr"
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class DODB::Index(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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property key_proc : Proc(V, String | NoIndex) | Proc(V, String)
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getter storage_root : String
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@storage : DODB::DataBase(V)
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@ -34,6 +34,8 @@ class DODB::Index(V) < DODB::Indexer(V)
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def index(key, value)
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index_key = key_proc.call value
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return if index_key.is_a? NoIndex
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symlink = file_path_index index_key
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Dir.mkdir_p ::File.dirname symlink
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@ -49,6 +51,8 @@ class DODB::Index(V) < DODB::Indexer(V)
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def deindex(key, value)
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index_key = key_proc.call value
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return if index_key.is_a? NoIndex
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symlink = file_path_index index_key
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::File.delete symlink
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@ -105,6 +109,9 @@ class DODB::Index(V) < DODB::Indexer(V)
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# in case new_value hasn't changed its index
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def update(new_value : V)
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index = key_proc.call new_value
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raise Exception.new "new value is not indexable" if index.is_a? NoIndex
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update index, new_value
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end
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8
src/dodb/no_index.cr
Normal file
8
src/dodb/no_index.cr
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@ -0,0 +1,8 @@
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class DODB::NoIndex
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end
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module DODB
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class_getter no_index = NoIndex.new
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end
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