git.m6w6.name Git - awesomized/libmemcached/blob - example/cpp_example.cc

   1 /*
   2  * An example file showing the usage of the C++ libmemcached interface.
   3  */
   4 #include "mem_config.h"
   5
   6 #include <vector>
   7 #include <string>
   8 #include <iostream>
   9 #include <algorithm>
  10 #include <map>
  11
  12 #include <string.h>
  13
  14 #include "libmemcached/memcached.hpp"
  15
  16 using namespace std;
  17 using namespace memcache;
  18
  19 class DeletePtrs
  20 {
  21 public:
  22   template<typename T>
  23   inline void operator()(const T *ptr) const
  24   {
  25     delete ptr;
  26   }
  27 };
  28
  29 class MyCache
  30 {
  31 public:
  32
  33   static const uint32_t num_of_clients= 10;
  34
  35   static MyCache &singleton()
  36   {
  37     static MyCache instance;
  38     return instance;
  39   }
  40
  41   void set(const string &key,
  42            const vector<char> &value)
  43   {
  44     time_t expiry= 0;
  45     uint32_t flags= 0;
  46     getCache()->set(key, value, expiry, flags);
  47   }
  48
  49   vector<char> get(const string &key)
  50   {
  51     vector<char> ret_value;
  52     getCache()->get(key, ret_value);
  53     return ret_value;
  54   }
  55
  56   void remove(const string &key)
  57   {
  58     getCache()->remove(key);
  59   }
  60
  61   Memcache *getCache()
  62   {
  63     /*
  64      * pick a random element from the vector of clients. Obviously, this is
  65      * not very random but suffices as an example!
  66      */
  67     uint32_t index= rand() % num_of_clients;
  68     return clients[index];
  69   }
  70
  71 private:
  72
  73   /*
  74    * A vector of clients.
  75    */
  76   std::vector<Memcache *> clients;
  77
  78   MyCache()
  79     :
  80       clients()
  81   {
  82     /* create clients and add them to the vector */
  83     for (uint32_t i= 0; i < num_of_clients; i++)
  84     {
  85       Memcache *client= new Memcache("127.0.0.1:11211");
  86       clients.push_back(client);
  87     }
  88   }
  89
  90   ~MyCache()
  91   {
  92     for_each(clients.begin(), clients.end(), DeletePtrs());
  93     clients.clear();
  94   }
  95
  96   MyCache(const MyCache&);
  97
  98 };
  99
 100 class Product
 101 {
 102 public:
 103
 104   Product(int in_id, double in_price)
 105     :
 106       id(in_id),
 107       price(in_price)
 108   {}
 109
 110   Product()
 111     :
 112       id(0),
 113       price(0.0)
 114   {}
 115
 116   int getId() const
 117   {
 118     return id;
 119   }
 120
 121   double getPrice() const
 122   {
 123     return price;
 124   }
 125
 126 private:
 127
 128   int id;
 129   double price;
 130
 131 };
 132
 133 void setAllProducts(vector<Product> &products)
 134 {
 135   vector<char> raw_products(products.size() * sizeof(Product));
 136   memcpy(&raw_products[0], &products[0], products.size() * sizeof(Product));
 137   MyCache::singleton().set("AllProducts", raw_products);
 138 }
 139
 140 vector<Product> getAllProducts()
 141 {
 142   vector<char> raw_products = MyCache::singleton().get("AllProducts");
 143   vector<Product> products(raw_products.size() / sizeof(Product));
 144   memcpy(&products[0], &raw_products[0], raw_products.size());
 145   return products;
 146 }
 147
 148 Product getProduct(const string &key)
 149 {
 150   vector<char> raw_product= MyCache::singleton().get(key);
 151   Product ret;
 152   if (! raw_product.empty())
 153   {
 154     memcpy(&ret, &raw_product[0], sizeof(Product));
 155   }
 156   else
 157   {
 158     /* retrieve it from the persistent store */
 159   }
 160   return ret;
 161 }
 162
 163 void setProduct(const string &key, const Product &product)
 164 {
 165   vector<char> raw_product(sizeof(Product));
 166   memcpy(&raw_product[0], &product, sizeof(Product));
 167   MyCache::singleton().set(key, raw_product);
 168 }
 169
 170 int main()
 171 {
 172   Memcache first_client("127.0.0.1:19191");
 173   map< string, map<string, string> > my_stats;
 174   first_client.getStats(my_stats);
 175
 176   /*
 177    * Iterate through the retrieved stats.
 178    */
 179   map< string, map<string, string> >::iterator it=
 180     my_stats.begin();
 181   while (it != my_stats.end())
 182   {
 183     cout << "working with server: " << (*it).first << endl;
 184     map<string, string> serv_stats= (*it).second;
 185     map<string, string>::iterator iter= serv_stats.begin();
 186     while (iter != serv_stats.end())
 187     {
 188       cout << (*iter).first << ":" << (*iter).second << endl;
 189       ++iter;
 190     }
 191     ++it;
 192   }
 193
 194   return EXIT_SUCCESS;
 195 }