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Merge pull request #257 from dryabov/top_hashtags

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add aging for hashtags
This commit is contained in:
miguelfreitas 2014-09-20 18:57:48 -03:00
commit f8e92b7302
1 changed files with 42 additions and 10 deletions
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52
src/twister.cpp
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@ -70,6 +70,13 @@ static std::map<std::string,UserData> m_users;
static CCriticalSection cs_seenHashtags;
static std::map<std::string,double> m_seenHashtags;
const double hashtagHalfLife = 8*60*60; // Halve votes within 8 hours (sec)
const double hashtagExpiration = 7*24*60*60; // Remove a hashtag from the list after ~ hashtagExpiration*count (sec)
const int hashtagTimerInterval = 60; // Timer interval (sec)
const double hashtagAgingFactor = pow(0.5, hashtagTimerInterval/hashtagHalfLife);
const double hashtagCriticalValue = pow(0.5, hashtagExpiration/hashtagHalfLife);
class SimpleThreadCounter {
public:
SimpleThreadCounter(CCriticalSection *lock, int *counter, const char *name) :
@ -848,6 +855,34 @@ void ThreadSessionAlerts()
}
}
void ThreadHashtagsAging()
{
SimpleThreadCounter threadCounter(&cs_twister, &m_threadsToJoin, "hashtags-aging");
while(!m_ses && !m_shuttingDownSession) {
MilliSleep(200);
}
while (m_ses && !m_shuttingDownSession) {
{
LOCK(cs_seenHashtags);
for( std::map<std::string,double>::iterator iter = m_seenHashtags.begin(); iter != m_seenHashtags.end(); ) {
iter->second *= hashtagAgingFactor;
if( iter->second < hashtagCriticalValue ) {
m_seenHashtags.erase(iter++);
} else {
++iter;
}
}
}
for(int i=0; i<hashtagTimerInterval && !m_shuttingDownSession; ++i) {
MilliSleep(1000);
}
}
}
void startSessionTorrent(boost::thread_group& threadGroup)
{
printf("startSessionTorrent (waiting for external IP)\n");
@ -868,6 +903,7 @@ void startSessionTorrent(boost::thread_group& threadGroup)
threadGroup.create_thread(boost::bind(&ThreadWaitExtIP));
threadGroup.create_thread(boost::bind(&ThreadMaintainDHTNodes));
threadGroup.create_thread(boost::bind(&ThreadSessionAlerts));
threadGroup.create_thread(boost::bind(&ThreadHashtagsAging));
}
void stopSessionTorrent()
@ -1373,16 +1409,6 @@ void updateSeenHashtags(std::string &message, int64_t msgTime)
if( message.find('#') == string::npos )
return;
boost::int64_t curTime = GetAdjustedTime();
if( msgTime > curTime ) msgTime = curTime;
double vote = 1.0;
if( msgTime + (2*3600) < curTime ) {
double timeDiff = (curTime - msgTime);
timeDiff /= (2*3600);
vote /= timeDiff;
}
// split and look for hashtags
vector<string> tokens;
set<string> hashtags;
@ -1403,6 +1429,12 @@ void updateSeenHashtags(std::string &message, int64_t msgTime)
}
if( hashtags.size() ) {
boost::int64_t curTime = GetAdjustedTime();
if( msgTime > curTime ) msgTime = curTime;
double timeDiff = (curTime - msgTime);
double vote = pow(0.5, timeDiff/hashtagHalfLife);
LOCK(cs_seenHashtags);
BOOST_FOREACH(string const& word, hashtags) {
if( m_seenHashtags.count(word) ) {