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55 lines
1.6 KiB
C++
55 lines
1.6 KiB
C++
/*
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*
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* (C) 2017 - ntop.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#ifndef _FREQUENT_STRING_ITEMS_H_
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#define _FREQUENT_STRING_ITEMS_H_
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#include "ntop_includes.h"
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/* https://resources.sei.cmu.edu/asset_files/Presentation/2010_017_001_49763.pdf */
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typedef struct {
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char *key;
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u_int32_t value;
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UT_hash_handle hh; /* makes this structure hashable */
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} FrequentStringKey_t;
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/* *************************************** */
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class FrequentStringItems {
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private:
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u_int32_t max_items, max_items_threshold;
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FrequentStringKey_t *q;
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Mutex m;
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bool thread_safe;
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void cleanup();
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void prune();
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public:
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FrequentStringItems(u_int32_t _max_items, bool _thread_safe = true) { max_items =_max_items, max_items_threshold = 2*_max_items, q = NULL, thread_safe = _thread_safe; }
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~FrequentStringItems();
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void add(char *key, u_int32_t value);
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void print();
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char* json();
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};
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#endif /* _FREQUENT_STRING_ITEMS_H_ */
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