Drizzled Public API Documentation

status_table_function.cc
00001 /*
00002   Copyright (C) 2010 Stewart Smith
00003 
00004   This program is free software; you can redistribute it and/or
00005   modify it under the terms of the GNU General Public License
00006   as published by the Free Software Foundation; either version 2
00007   of the License, or (at your option) any later version.
00008 
00009   This program is distributed in the hope that it will be useful,
00010   but WITHOUT ANY WARRANTY; without even the implied warranty of
00011   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012   GNU General Public License for more details.
00013 
00014   You should have received a copy of the GNU General Public License
00015   along with this program; if not, write to the Free Software
00016   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
00017 */
00018 
00019 #include <config.h>
00020 #include <drizzled/plugin/table_function.h>
00021 
00022 #include <haildb.h>
00023 
00024 #include "status_table_function.h"
00025 
00026 using namespace std;
00027 using namespace drizzled;
00028 
00029 class LibInnoDBStatusTool : public drizzled::plugin::TableFunction
00030 {
00031 public:
00032 
00033   LibInnoDBStatusTool();
00034 
00035   LibInnoDBStatusTool(const char *table_arg) :
00036     drizzled::plugin::TableFunction("data_dictionary", table_arg)
00037   { }
00038 
00039   ~LibInnoDBStatusTool() {}
00040 
00041   class Generator : public drizzled::plugin::TableFunction::Generator
00042   {
00043   private:
00044     const char **names;
00045     uint32_t names_count;
00046     uint32_t names_next;
00047   public:
00048     Generator(drizzled::Field **arg);
00049     ~Generator();
00050 
00051     bool populate();
00052   };
00053 
00054   LibInnoDBStatusTool::Generator *generator(drizzled::Field **arg)
00055   {
00056     return new Generator(arg);
00057   }
00058 };
00059 
00060 LibInnoDBStatusTool::LibInnoDBStatusTool() :
00061   plugin::TableFunction("DATA_DICTIONARY", "HAILDB_STATUS")
00062 {
00063   add_field("NAME");
00064   add_field("VALUE", plugin::TableFunction::NUMBER);
00065 }
00066 
00067 LibInnoDBStatusTool::Generator::Generator(Field **arg) :
00068   plugin::TableFunction::Generator(arg),
00069   names_next(0)
00070 {
00071   ib_err_t err= ib_status_get_all(&names, &names_count);
00072   assert(err == DB_SUCCESS);
00073 }
00074 
00075 LibInnoDBStatusTool::Generator::~Generator()
00076 {
00077   free(names);
00078 }
00079 
00080 bool LibInnoDBStatusTool::Generator::populate()
00081 {
00082   if (names[names_next] != NULL)
00083   {
00084     const char* config_name= names[names_next];
00085 
00086     push(config_name);
00087 
00088     ib_i64_t value;
00089     ib_err_t err= ib_status_get_i64(config_name, &value);
00090     assert(err == DB_SUCCESS);
00091 
00092     push(value);
00093 
00094     names_next++;
00095     return true;
00096   }
00097 
00098   return false; // No more rows
00099 }
00100 
00101 static LibInnoDBStatusTool *status_tool;
00102 
00103 int status_table_function_initialize(drizzled::module::Context &context)
00104 {
00105   status_tool= new(std::nothrow)LibInnoDBStatusTool();
00106   context.add(status_tool);
00107 
00108   return 0;
00109 }