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/* connpool.cpp
*/
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// _ todo: reconnect?
#include "pch.h"
#include "connpool.h"
#include "../db/commands.h"
#include "syncclusterconnection.h"
namespace mongo {
DBConnectionPool pool;
DBClientBase* DBConnectionPool::get(const string& host) {
scoped_lock L(_mutex);
PoolForHost *&p = _pools[host];
if ( p == 0 )
p = new PoolForHost();
if ( p->pool.empty() ) {
int numCommas = DBClientBase::countCommas( host );
DBClientBase *c;
if( numCommas == 0 ) {
DBClientConnection *cc = new DBClientConnection(true);
log(2) << "creating new connection for pool to:" << host << endl;
string errmsg;
if ( !cc->connect(host.c_str(), errmsg) ) {
delete cc;
uassert( 11002 , (string)"dbconnectionpool: connect failed " + host , false);
return 0;
}
c = cc;
onCreate( c );
}
else if ( numCommas == 1 ) {
DBClientPaired *p = new DBClientPaired();
if( !p->connect(host) ) {
delete p;
uassert( 11003 , (string)"dbconnectionpool: connect failed [2] " + host , false);
return 0;
}
c = p;
}
else if ( numCommas == 2 ) {
c = new SyncClusterConnection( host );
}
else {
uassert( 13071 , (string)"invalid hostname [" + host + "]" , 0 );
c = 0; // prevents compiler warning
}
p->created++;
return c;
}
DBClientBase *c = p->pool.top();
p->pool.pop();
onHandedOut( c );
return c;
}
void DBConnectionPool::flush(){
scoped_lock L(_mutex);
for ( map<string,PoolForHost*>::iterator i = _pools.begin(); i != _pools.end(); i++ ){
PoolForHost* p = i->second;
vector<DBClientBase*> all;
while ( ! p->pool.empty() ){
DBClientBase * c = p->pool.top();
p->pool.pop();
all.push_back( c );
bool res;
c->isMaster( res );
}
for ( vector<DBClientBase*>::iterator i=all.begin(); i != all.end(); i++ ){
p->pool.push( *i );
}
}
}
void DBConnectionPool::addHook( DBConnectionHook * hook ){
_hooks.push_back( hook );
}
void DBConnectionPool::onCreate( DBClientBase * conn ){
if ( _hooks.size() == 0 )
return;
for ( list<DBConnectionHook*>::iterator i = _hooks.begin(); i != _hooks.end(); i++ ){
(*i)->onCreate( conn );
}
}
void DBConnectionPool::onHandedOut( DBClientBase * conn ){
if ( _hooks.size() == 0 )
return;
for ( list<DBConnectionHook*>::iterator i = _hooks.begin(); i != _hooks.end(); i++ ){
(*i)->onHandedOut( conn );
}
}
void DBConnectionPool::appendInfo( BSONObjBuilder& b ){
scoped_lock lk( _mutex );
BSONObjBuilder bb( b.subobjStart( "hosts" ) );
for ( map<string,PoolForHost*>::iterator i=_pools.begin(); i!=_pools.end(); ++i ){
string s = i->first;
BSONObjBuilder temp( bb.subobjStart( s.c_str() ) );
temp.append( "available" , (int)(i->second->pool.size()) );
temp.appendNumber( "created" , i->second->created );
temp.done();
}
bb.done();
}
ScopedDbConnection * ScopedDbConnection::steal(){
assert( _conn );
ScopedDbConnection * n = new ScopedDbConnection( _host , _conn );
_conn = 0;
return n;
}
ScopedDbConnection::~ScopedDbConnection() {
if ( _conn ){
if ( ! _conn->isFailed() ) {
/* see done() comments above for why we log this line */
log() << "~ScopedDBConnection: _conn != null" << endl;
}
kill();
}
}
class PoolFlushCmd : public Command {
public:
PoolFlushCmd() : Command( "connPoolSync" , false , "connpoolsync" ){}
virtual void help( stringstream &help ) const { help<<"internal"; }
virtual LockType locktype() const { return NONE; }
virtual bool run(const char*, mongo::BSONObj&, std::string&, mongo::BSONObjBuilder& result, bool){
pool.flush();
return true;
}
virtual bool slaveOk() const {
return true;
}
} poolFlushCmd;
class PoolStats : public Command {
public:
PoolStats() : Command( "connPoolStats" ){}
virtual void help( stringstream &help ) const { help<<"stats about connection pool"; }
virtual LockType locktype() const { return NONE; }
virtual bool run(const char*, mongo::BSONObj&, std::string&, mongo::BSONObjBuilder& result, bool){
pool.appendInfo( result );
return true;
}
virtual bool slaveOk() const {
return true;
}
} poolStatsCmd;
} // namespace mongo
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