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// shardconnection.cpp
/**
* Copyright (C) 2008 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "pch.h"
#include "shard.h"
#include "config.h"
#include "request.h"
#include <set>
namespace mongo {
/**
* holds all the actual db connections for a client to various servers
*/
class ClientConnections : boost::noncopyable {
public:
struct Status : boost::noncopyable {
Status() : created(0){}
std::stack<DBClientBase*> avail;
long long created;
};
Nullstream& debug( Status * s = 0 , const string& addr = "" ){
static int ll = 9;
if ( logLevel < ll )
return nullstream;
Nullstream& l = log(ll);
l << "ClientConnections DEBUG " << this << " ";
if ( s ){
l << "s: " << s << " addr: " << addr << " ";
}
return l;
}
ClientConnections() : _mutex("ClientConnections") {
debug() << " NEW " << endl;
}
~ClientConnections(){
debug() << " KILLING " << endl;
for ( map<string,Status*>::iterator i=_hosts.begin(); i!=_hosts.end(); ++i ){
string addr = i->first;
Status* ss = i->second;
assert( ss );
std::stack<DBClientBase*>& s = ss->avail;
while ( ! s.empty() ){
pool.release( addr , s.top() );
s.pop();
}
delete ss;
}
_hosts.clear();
}
DBClientBase * get( const string& addr ){
scoped_lock lk( _mutex );
Status* &s = _hosts[addr];
if ( ! s )
s = new Status();
debug() << "WANT ONE pool empty: " << s->avail.empty() << endl;
if ( ! s->avail.empty() ){
DBClientBase* c = s->avail.top();
s->avail.pop();
debug( s , addr ) << "GOT " << c << endl;
pool.onHandedOut( c );
return c;
}
debug() << "CREATING NEW CONNECTION" << endl;
s->created++;
return pool.get( addr );
}
void done( const string& addr , DBClientBase* conn ){
scoped_lock lk( _mutex );
Status* s = _hosts[addr];
assert( s );
if ( s->avail.size() > 0 ){
delete conn;
return;
}
s->avail.push( conn );
debug( s , addr ) << "PUSHING: " << conn << endl;
}
void sync(){
scoped_lock lk( _mutex );
for ( map<string,Status*>::iterator i=_hosts.begin(); i!=_hosts.end(); ++i ){
string addr = i->first;
Status* ss = i->second;
assert( ss );
std::stack<DBClientBase*>& s = ss->avail;
while ( ! s.empty() ){
DBClientBase* conn = s.top();
conn->getLastError();
pool.release( addr , conn );
s.pop();
}
delete ss;
}
_hosts.clear();
}
map<string,Status*> _hosts;
mongo::mutex _mutex;
// -----
static thread_specific_ptr<ClientConnections> _perThread;
static ClientConnections* get(){
ClientConnections* cc = _perThread.get();
if ( ! cc ){
cc = new ClientConnections();
_perThread.reset( cc );
}
return cc;
}
};
thread_specific_ptr<ClientConnections> ClientConnections::_perThread;
ShardConnection::ShardConnection( const Shard * s , const string& ns )
: _addr( s->getConnString() ) , _ns( ns ) {
_init();
}
ShardConnection::ShardConnection( const Shard& s , const string& ns )
: _addr( s.getConnString() ) , _ns( ns ) {
_init();
}
ShardConnection::ShardConnection( const string& addr , const string& ns )
: _addr( addr ) , _ns( ns ) {
_init();
}
void ShardConnection::_init(){
assert( _addr.size() );
_conn = ClientConnections::get()->get( _addr );
_finishedInit = false;
}
void ShardConnection::_finishInit(){
if ( _finishedInit )
return;
_finishedInit = true;
if ( _ns.size() ){
_setVersion = checkShardVersion( *_conn , _ns );
}
else {
_setVersion = false;
}
}
void ShardConnection::done(){
if ( _conn ){
ClientConnections::get()->done( _addr , _conn );
_conn = 0;
_finishedInit = true;
}
}
void ShardConnection::kill(){
if ( _conn ){
delete _conn;
_conn = 0;
_finishedInit = true;
}
}
void ShardConnection::sync(){
ClientConnections::get()->sync();
}
ShardConnection::~ShardConnection() {
if ( _conn ){
if ( ! _conn->isFailed() ) {
/* see done() comments above for why we log this line */
log() << "~ScopedDBConnection: _conn != null" << endl;
}
kill();
}
}
}
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