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// Simple Wrapper to MemCacheClient
/* IIP Image Server
Copyright (C) 2010 Ruven Pillay, Michal Becak.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _MEMCACHED_WINDOWS_H
#define _MEMCACHED_WINDOWS_H
#include <string>
#include <sstream>
#include <vector>
#include "MemCacheClient.h"
#ifdef WIN32
#pragma comment(lib, "ws2_32.lib")
#endif
/// Cache to store raw tile data
class Memcache {
private:
/// Memcached structure
MemCacheClient *_memc;
/// Memcached return value
MCResult _rc;
/// Memcached servers
std::vector<std::string> *_servers;
/// Cache expiry set to 1 hour
time_t _timeout;
/// Length of data returned
size_t _length;
/// Flag whether we are connected
bool _connected;
public:
/// Constructor
/** @param servernames list of memcached servers
@param timeout memcached timeout - defaults to 1 hour (3600 seconds)
*/
Memcache( const std::string& servernames = "localhost", unsigned int timeout = 3600 ) {
// Create our memcached object
_memc = new MemCacheClient;
// Set our timeout
_timeout = timeout;
_memc->SetTimeout(timeout);
// Create a list of servers
_servers = new std::vector<std::string>();
//split string on ',' and save chunks to vector
std::stringstream ss(servernames);
std::string serverItem;
while(std::getline(ss, serverItem, ',')) {
if (serverItem == "localhost")//MemCacheClient needs ip address, so we map localhost to 127.0.0.1
serverItem = "127.0.0.1";
_servers->push_back(serverItem);
}
// Connect to the servers
_connected = false;
for (int i = 0; i < _servers->size(); i++) {
_connected = _connected || _memc->AddServer(_servers->at(i).c_str());
}
};
/// Destructor
~Memcache() {
// Disconnect from our servers and free our memcached structure
if( _servers ) {
delete _servers;
_servers = NULL;
}
if( _memc ) _memc->~MemCacheClient();
}
/// Insert data into our cache
/** @param key key used for cache
@param data pointer to the data to be stored
@param length length of data to be stored
*/
void store( const std::string& key, void* data, unsigned int length ){
if( !_connected ) return;
MemCacheClient::MemRequest req;
req.mKey = "iipsrv::" + key;
req.mData.WriteBytes(data, length);
_memc->Set(req);
_rc = req.mResult;
}
/// Retrieve data from our cache
/** @param key key for cache data
@return pointer to data
*/
char* retrieve( const std::string& key ){
if( !_connected ) return NULL;
MemCacheClient::MemRequest req;
req.mKey = "iipsrv::" + key;
int result = _memc->Get(req);
if (result == 0)//if 0 items retrieved
return NULL;
_rc = req.mResult;
_length = req.mData.GetReadSize();
char * returnData = new char[_length];
req.mData.ReadBytes(returnData,_length);
return returnData;
}
/// Get error string
const char* error(){
return _memc->ConvertResult(_rc);
};
/// Return the number of bytes in the result
unsigned int length(){ return _length; };
/// Tell us whether we are connected to any memcached servers
bool connected(){ return _connected; };
};
#endif
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