76 lines
1.5 KiB
Plaintext
76 lines
1.5 KiB
Plaintext
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<HTML>
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<HEAD>
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<TITLE>LJ::Cache - LRU Cache</TITLE>
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<LINK REV="made" HREF="mailto:hackers@FreeBSD.org">
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</HEAD>
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<BODY>
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<!-- INDEX BEGIN -->
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<UL>
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<LI><A HREF="#NAME">NAME</A>
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<LI><A HREF="#SYNOPSIS">SYNOPSIS</A>
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<LI><A HREF="#DESCRIPTION">DESCRIPTION</A>
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<LI><A HREF="#AUTHOR">AUTHOR</A>
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<LI><A HREF="#SEE_ALSO">SEE ALSO</A>
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</UL>
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<!-- INDEX END -->
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<HR>
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<P>
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<H1><A NAME="NAME">NAME</A></H1>
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<P>
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LJ::Cache - LRU Cache
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<P>
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<HR>
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<H1><A NAME="SYNOPSIS">SYNOPSIS</A></H1>
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<P>
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<PRE> use LJ::Cache;
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my $cache = new LJ::Cache { 'maxsize' => 20 };
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my $value = $cache->get($key);
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unless (defined $value) {
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$val = "load some value";
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$cache->set($key, $value);
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}
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</PRE>
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<P>
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<HR>
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<H1><A NAME="DESCRIPTION">DESCRIPTION</A></H1>
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<P>
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This class implements an LRU dictionary cache. The two operations on it are
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<CODE>get()</CODE> and <CODE>set(),</CODE> both of which promote the key
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being referenced to the ``top'' of the cache, so it will stay alive
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longest.
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<P>
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When the cache is full and and a new item needs to be added, the oldest one
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is thrown away.
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<P>
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You should be able to regenerate the data at any time, if
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<CODE>get()</CODE> returns undef.
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<P>
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This class is useful for caching information from a slower data source
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while also keeping a bound on memory usage.
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<P>
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<HR>
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<H1><A NAME="AUTHOR">AUTHOR</A></H1>
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<P>
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Brad Fitzpatrick, <A
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HREF="mailto:bradfitz@bradfitz.com">bradfitz@bradfitz.com</A>
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<P>
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<HR>
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<H1><A NAME="SEE_ALSO">SEE ALSO</A></H1>
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<P>
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<CODE>perl(1).</CODE>
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</BODY>
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</HTML>
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