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78 lines
1.5 KiB
78 lines
1.5 KiB
//
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// VolatileCache.cc
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//
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// VolatileCache: the simplest non-persistent Query result cache.
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// This is default policy.
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//
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// Part of the ht://Dig package <http://www.htdig.org/>
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// Copyright (c) 1995-2004 The ht://Dig Group
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// For copyright details, see the file COPYING in your distribution
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// or the GNU Library General Public License (LGPL) version 2 or later
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// <http://www.gnu.org/copyleft/lgpl.html>
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//
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// $Id: VolatileCache.cc,v 1.4 2004/05/28 13:15:24 lha Exp $
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//
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#include "VolatileCache.h"
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#include "ResultList.h"
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//
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// a pseudo-constant empty result list
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// used to avoid null pointers in the cache
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//
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ResultList theEmptyResult;
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ResultList * const
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VolatileCache::empty = &theEmptyResult;
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extern int debug;
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//
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// find a cache entry
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//
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ResultList *
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VolatileCache::Lookup(const String &signature)
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{
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ResultList *result = (ResultList *)cache[signature];
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return result;
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}
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//
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// add a cache entry
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//
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void
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VolatileCache::Add(const String &signature, ResultList *entry)
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{
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ResultList *previous = (ResultList *)cache[signature];
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if(previous && previous != empty)
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{
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delete previous;
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}
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if(!entry)
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{
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entry = empty;
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}
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cache.Add(signature, entry);
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}
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//
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// clear the in-memory cache
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// avoids deletion of the shared 'empty' element
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//
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VolatileCache::~VolatileCache()
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{
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if(debug) cerr << "query CLEAR: entries=" << cache.Count() << endl;
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cache.Start_Get();
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ResultList *kill = (ResultList *)cache.Get_NextElement();
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while(kill)
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{
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if(kill != empty)
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{
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delete kill;
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}
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kill = (ResultList *)cache.Get_NextElement();
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}
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cache.Release();
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}
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