livestatus/src/LogCache.h

   1 // +------------------------------------------------------------------+
   2 // |             ____ _               _        __  __ _  __           |
   3 // |            / ___| |__   ___  ___| | __   |  \/  | |/ /           |
   4 // |           | |   | '_ \ / _ \/ __| |/ /   | |\/| | ' /            |
   5 // |           | |___| | | |  __/ (__|   <    | |  | | . \            |
   6 // |            \____|_| |_|\___|\___|_|\_\___|_|  |_|_|\_\           |
   7 // |                                                                  |
   8 // | Copyright Mathias Kettner 2014             mk@mathias-kettner.de |
   9 // +------------------------------------------------------------------+
  10 //
  11 // This file is part of Check_MK.
  12 // The official homepage is at http://mathias-kettner.de/check_mk.
  13 //
  14 // check_mk is free software;  you can redistribute it and/or modify it
  15 // under the  terms of the  GNU General Public License  as published by
  16 // the Free Software Foundation in version 2.  check_mk is  distributed
  17 // in the hope that it will be useful, but WITHOUT ANY WARRANTY;  with-
  18 // out even the implied warranty of  MERCHANTABILITY  or  FITNESS FOR A
  19 // PARTICULAR PURPOSE. See the  GNU General Public License for more de-
  20 // tails. You should have  received  a copy of the  GNU  General Public
  21 // License along with GNU Make; see the file  COPYING.  If  not,  write
  22 // to the Free Software Foundation, Inc., 51 Franklin St,  Fifth Floor,
  23 // Boston, MA 02110-1301 USA.
  24
  25 #ifndef LogCache_h
  26 #define LogCache_h
  27
  28 #include "config.h"  // IWYU pragma: keep
  29 #include <chrono>
  30 #include <ctime>
  31 #include <map>
  32 #include <memory>
  33 #include <mutex>
  34 class Logfile;
  35 class Logger;
  36 class MonitoringCore;
  37
  38 using logfiles_t = std::map<time_t, std::unique_ptr<Logfile>>;
  39
  40 class LogCache {
  41 public:
  42     std::mutex _lock;
  43
  44     LogCache(MonitoringCore *mc, unsigned long max_cached_messages);
  45 #ifdef CMC
  46     void setMaxCachedMessages(unsigned long m);
  47 #endif
  48     void logLineHasBeenAdded(Logfile *logfile, unsigned logclasses);
  49     void update();
  50     auto begin() { return _logfiles.begin(); }
  51     auto end() { return _logfiles.end(); }
  52
  53 private:
  54     MonitoringCore *const _mc;
  55     unsigned long _max_cached_messages;
  56     unsigned long _num_at_last_check;
  57     logfiles_t _logfiles;
  58     std::chrono::system_clock::time_point _last_index_update;
  59
  60     void addToIndex(std::unique_ptr<Logfile> logfile);
  61     Logger *logger() const;
  62 };
  63
  64 #endif  // LogCache_h