mirror of https://github.com/aria2/aria2
109 lines
3.8 KiB
C++
109 lines
3.8 KiB
C++
/* <!-- copyright */
|
|
/*
|
|
* aria2 - The high speed download utility
|
|
*
|
|
* Copyright (C) 2006 Tatsuhiro Tsujikawa
|
|
*
|
|
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
* In addition, as a special exception, the copyright holders give
|
|
* permission to link the code of portions of this program with the
|
|
* OpenSSL library under certain conditions as described in each
|
|
* individual source file, and distribute linked combinations
|
|
* including the two.
|
|
* You must obey the GNU General Public License in all respects
|
|
* for all of the code used other than OpenSSL. If you modify
|
|
* file(s) with this exception, you may extend this exception to your
|
|
* version of the file(s), but you are not obligated to do so. If you
|
|
* do not wish to do so, delete this exception statement from your
|
|
* version. If you delete this exception statement from all source
|
|
* files in the program, then also delete it here.
|
|
*/
|
|
/* copyright --> */
|
|
#include "ServerStatURISelector.h"
|
|
#include "ServerStatMan.h"
|
|
#include "ServerStat.h"
|
|
#include "Request.h"
|
|
#include "A2STR.h"
|
|
#include <algorithm>
|
|
|
|
namespace aria2 {
|
|
|
|
ServerStatURISelector::ServerStatURISelector
|
|
(const SharedHandle<ServerStatMan>& serverStatMan):
|
|
_serverStatMan(serverStatMan) {}
|
|
|
|
ServerStatURISelector::~ServerStatURISelector() {}
|
|
|
|
class ServerStatFaster {
|
|
public:
|
|
bool operator()(const std::pair<SharedHandle<ServerStat>, std::string> lhs,
|
|
const std::pair<SharedHandle<ServerStat>, std::string> rhs)
|
|
const
|
|
{
|
|
return lhs.first->getDownloadSpeed() > rhs.first->getDownloadSpeed();
|
|
}
|
|
};
|
|
|
|
std::string ServerStatURISelector::select(std::deque<std::string>& uris)
|
|
{
|
|
if(uris.empty()) {
|
|
return A2STR::NIL;
|
|
}
|
|
// Use first 10 URIs to introduce some randomness.
|
|
const int NUM_URI = 10;
|
|
// Ignore low speed server
|
|
const unsigned int SPEED_THRESHOLD = 20*1024;
|
|
size_t max = std::min(uris.size(), static_cast<size_t>(NUM_URI));
|
|
std::deque<std::string>::iterator urisLast = uris.begin()+max;
|
|
std::deque<std::pair<SharedHandle<ServerStat>, std::string> > cands;
|
|
for(std::deque<std::string>::iterator i = uris.begin();
|
|
i != urisLast; ++i) {
|
|
Request r;
|
|
r.setUrl(*i);
|
|
SharedHandle<ServerStat> ss = _serverStatMan->find(r.getHost(),
|
|
r.getProtocol());
|
|
if(!ss.isNull() && ss->isOK() && ss->getDownloadSpeed() > SPEED_THRESHOLD) {
|
|
cands.push_back(std::pair<SharedHandle<ServerStat>, std::string>(ss, *i));
|
|
}
|
|
}
|
|
if(cands.empty()) {
|
|
for(std::deque<std::string>::iterator i = uris.begin();
|
|
i != uris.end(); ++i) {
|
|
Request r;
|
|
r.setUrl(*i);
|
|
SharedHandle<ServerStat> ss = _serverStatMan->find(r.getHost(),
|
|
r.getProtocol());
|
|
// Skip ERROR state URI
|
|
if(ss.isNull() || ss->isOK()) {
|
|
std::string nextURI = *i;
|
|
uris.erase(uris.begin(), i+1);
|
|
return nextURI;
|
|
}
|
|
}
|
|
// All URIs are inspected but aria2 cannot find usable one.
|
|
// Return first URI anyway in this case.
|
|
std::string nextURI = uris.front();
|
|
uris.pop_front();
|
|
return nextURI;
|
|
} else {
|
|
std::sort(cands.begin(), cands.end(), ServerStatFaster());
|
|
uris.erase(std::find(uris.begin(), uris.end(), cands.front().second));
|
|
return cands.front().second;
|
|
}
|
|
}
|
|
|
|
} // namespace aria2
|