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83 lines
2.1 KiB
83 lines
2.1 KiB
3 years ago
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//
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// WordDBInfo.h
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//
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// NAME
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// inverted index usage environment.
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//
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// SYNOPSIS
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//
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// Only called thru WordContext::Initialize()
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//
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// DESCRIPTION
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//
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// The inverted indexes may be shared among processes/threads and provide the
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// appropriate locking to prevent mistakes. In addition the memory cache
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// used by <i>WordList</i> objects may be shared by processes/threads,
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// greatly reducing the memory needs in multi-process applications.
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// For more information about the shared environment, check the Berkeley
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// DB documentation.
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//
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// CONFIGURATION
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//
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// wordlist_env_skip {true,false} (default false)
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// If true no environment is created at all. This must never
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// be used if a <i>WordList</i> object is created. It may be
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// useful if only <i>WordKey</i> objects are used, for instance.
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//
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// wordlist_env_share {true,false} (default false)
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// If true a sharable environment is open or created if none exist.
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//
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// wordlist_env_dir <directory> (default .)
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// Only valid if <i>wordlist_env_share</i> set to <i>true.</i>
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// Specify the directory in which the sharable environment will
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// be created. All
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// inverted indexes specified with a non-absolute pathname will be
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// created relative to this directory.
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//
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//
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// END
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//
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// Part of the ht://Dig package <http://www.htdig.org/>
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// Copyright (c) 1999-2004 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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//
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#ifndef _WordDBInfo_h_
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#define _WordDBInfo_h_
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#include "Configuration.h"
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struct __db_env;
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class WordDBInfo
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{
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public:
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WordDBInfo(const Configuration& config);
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~WordDBInfo();
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//
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// Unique instance handlers
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//
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static void Initialize(const Configuration& config);
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static WordDBInfo* Instance() {
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if(instance) return instance;
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fprintf(stderr, "WordDBInfo::Instance: no instance\n");
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return 0;
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}
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//
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// Berkeley DB environment
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//
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struct __db_env *dbenv;
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//
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// Unique instance pointer
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//
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static WordDBInfo* instance;
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};
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#endif
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