47 lines
1.1 KiB
Factor
Executable File
47 lines
1.1 KiB
Factor
Executable File
! Copyright (C) 2009 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: accessors assocs continuations destructors fry kernel
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make math sequences ;
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IN: cache
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TUPLE: cache-assoc < disposable assoc max-age ;
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: <cache-assoc> ( -- cache )
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cache-assoc new-disposable H{ } clone >>assoc 10 >>max-age ;
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<PRIVATE
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TUPLE: cache-entry value age ;
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: <cache-entry> ( value -- entry ) 0 cache-entry boa ; inline
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M: cache-entry dispose value>> dispose ;
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M: cache-assoc assoc-size assoc>> assoc-size ;
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M: cache-assoc at* assoc>> at* [ dup [ 0 >>age value>> ] when ] dip ;
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M: cache-assoc set-at
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[ check-disposed ] keep
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[ <cache-entry> ] 2dip
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assoc>> set-at ;
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M: cache-assoc clear-assoc
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assoc>> [ values dispose-each ] [ clear-assoc ] bi ;
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M: cache-assoc >alist assoc>> [ value>> ] { } assoc-map-as ;
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INSTANCE: cache-assoc assoc
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M: cache-assoc dispose* clear-assoc ;
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PRIVATE>
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: purge-cache ( cache -- )
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[ assoc>> ] [ max-age>> ] bi '[
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[
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nip dup age>> 1 + [ >>age ] keep
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_ < [ drop t ] [ dispose, f ] if
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] assoc-filter! drop
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] { } make [ last rethrow ] unless-empty ;
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