Quiz: Multithreaded Debugging

type PostgresConnectionObj struct {
	host     string
	username string
	password string
	dbname   string
	port     int
}
var dbConn *PostgresConnectionObj // Declaration of a global variable to hold the singleton instance.
// Getter methods for the PostgresConnectionObj fields.
func (p *PostgresConnectionObj) getHost() string {
	return p.host
}
func (p *PostgresConnectionObj) getUser() string {
	return p.username
}
func (p *PostgresConnectionObj) getPassword() string {
	return p.password
}
func (p *PostgresConnectionObj) getDbName() string {
	return p.dbname
}
func (p *PostgresConnectionObj) getPort() int {
	return p.port
}
// Initialization function to create and initialize the singleton instance.
func initInstance() *PostgresConnectionObj {
	if dbConn == nil { // Check if the singleton instance is not created yet.
		dbConn = &PostgresConnectionObj{ // Create a new instance with default field values.
			host:     "hostname",
			username: "admin",
			password: "passwd",
			dbname:   "db",
			port:     5432,
		}
	}
	return dbConn // Return the singleton instance.
}