ClientCursor::ClientCursor(int queryOptions, const shared_ptr<Cursor>& c, const string& ns, BSONObj query ) :
_ns(ns), _db( cc().database() ),
_c(c), _pos(0),
_query(query), _queryOptions(queryOptions),
_idleAgeMillis(0), _pinValue(0),
_doingDeletes(false), _yieldSometimesTracker(128,10) {
Lock::assertAtLeastReadLocked(ns);
verify( _db );
verify( str::startsWith(_ns, _db->name) );
if( queryOptions & QueryOption_NoCursorTimeout )
noTimeout();
recursive_scoped_lock lock(ccmutex);
_cursorid = allocCursorId_inlock();
clientCursorsById.insert( make_pair(_cursorid, this) );
if ( ! _c->modifiedKeys() ) {
// store index information so we can decide if we can
// get something out of the index key rather than full object
int x = 0;
BSONObjIterator i( _c->indexKeyPattern() );
while ( i.more() ) {
BSONElement e = i.next();
if ( e.isNumber() ) {
// only want basic index fields, not "2d" etc
_indexedFields[e.fieldName()] = x;
}
x++;
}
}
}
void ClientCursor::initCursorID() {
{
recursive_scoped_lock lock(ccmutex);
_cursorid = allocCursorId_inlock();
clientCursorsById.insert( make_pair(_cursorid, this) );
}
if (_partOfMultiStatementTxn) {
transactions = cc().txnStack();
// This cursor is now part of a multi-statement transaction and must be
// closed before that txn commits or aborts. Note it in the rollback.
ClientCursorRollback &rollback = cc().txn().clientCursorRollback();
rollback.noteClientCursor(_cursorid);
}
}
void ClientCursor::init() {
_db = cc().database();
verify( _db );
verify( _db->ownsNS( _ns ) );
isAggCursor = false;
_idleAgeMillis = 0;
_leftoverMaxTimeMicros = 0;
_pinValue = 0;
_pos = 0;
Lock::assertAtLeastReadLocked(_ns);
if (_queryOptions & QueryOption_NoCursorTimeout) {
// cursors normally timeout after an inactivity period to prevent excess memory use
// setting this prevents timeout of the cursor in question.
++_pinValue;
}
recursive_scoped_lock lock(ccmutex);
_cursorid = allocCursorId_inlock();
clientCursorsById.insert( make_pair(_cursorid, this) );
}