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/*
* An example file showing the usage of the C++ libmemcached interface.
*/
#include <config.h>
#include <vector>
#include <string>
#include <iostream>
#include <algorithm>
#include <map>
#include <string.h>
#include <libmemcached/memcached.hpp>
using namespace std;
using namespace memcache;
class DeletePtrs
{
public:
template<typename T>
inline void operator()(const T *ptr) const
{
delete ptr;
}
};
class MyCache
{
public:
static const uint32_t num_of_clients= 10;
static MyCache &singleton()
{
static MyCache instance;
return instance;
}
void set(const string &key,
const vector<char> &value)
{
time_t expiry= 0;
uint32_t flags= 0;
getCache()->set(key, value, expiry, flags);
}
vector<char> get(const string &key)
{
vector<char> ret_value;
getCache()->get(key, ret_value);
return ret_value;
}
void remove(const string &key)
{
getCache()->remove(key);
}
Memcache *getCache()
{
/*
* pick a random element from the vector of clients. Obviously, this is
* not very random but suffices as an example!
*/
uint32_t index= rand() % num_of_clients;
return clients[index];
}
private:
/*
* A vector of clients.
*/
std::vector<Memcache *> clients;
MyCache()
:
clients()
{
/* create clients and add them to the vector */
for (uint32_t i= 0; i < num_of_clients; i++)
{
Memcache *client= new Memcache("127.0.0.1:11211");
clients.push_back(client);
}
}
~MyCache()
{
for_each(clients.begin(), clients.end(), DeletePtrs());
clients.clear();
}
MyCache(const MyCache&);
};
class Product
{
public:
Product(int in_id, double in_price)
:
id(in_id),
price(in_price)
{}
Product()
:
id(0),
price(0.0)
{}
int getId() const
{
return id;
}
double getPrice() const
{
return price;
}
private:
int id;
double price;
};
void setAllProducts(vector<Product> &products)
{
vector<char> raw_products(products.size() * sizeof(Product));
memcpy(&raw_products[0], &products[0], products.size() * sizeof(Product));
MyCache::singleton().set("AllProducts", raw_products);
}
vector<Product> getAllProducts()
{
vector<char> raw_products = MyCache::singleton().get("AllProducts");
vector<Product> products(raw_products.size() / sizeof(Product));
memcpy(&products[0], &raw_products[0], raw_products.size());
return products;
}
Product getProduct(const string &key)
{
vector<char> raw_product= MyCache::singleton().get(key);
Product ret;
if (! raw_product.empty())
{
memcpy(&ret, &raw_product[0], sizeof(Product));
}
else
{
/* retrieve it from the persistent store */
}
return ret;
}
void setProduct(const string &key, const Product &product)
{
vector<char> raw_product(sizeof(Product));
memcpy(&raw_product[0], &product, sizeof(Product));
MyCache::singleton().set(key, raw_product);
}
int main()
{
Memcache first_client("127.0.0.1:19191");
map< string, map<string, string> > my_stats;
first_client.getStats(my_stats);
/*
* Iterate through the retrieved stats.
*/
map< string, map<string, string> >::iterator it=
my_stats.begin();
while (it != my_stats.end())
{
cout << "working with server: " << (*it).first << endl;
map<string, string> serv_stats= (*it).second;
map<string, string>::iterator iter= serv_stats.begin();
while (iter != serv_stats.end())
{
cout << (*iter).first << ":" << (*iter).second << endl;
++iter;
}
++it;
}
return EXIT_SUCCESS;
}
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