public function computeAll() {
        $root_id = $this->tree->getUserPreference($this->user, 'MAJ_SOSA_ROOT_ID');        
        $indi = Individual::getInstance($root_id, $this->tree);
        if($indi){
            $this->sosa_provider->deleteAll();
            $this->addNode($indi, 1);
            $this->flushTmpSosaTable(true);
            return true;
        }     
        return false;
    }