The «shared» attribute's default value is always «true» for all types of settings (events, preferences, arguments, etc)

dmitry_fedyuk · August 13, 2015, 12:23pm

magento.stackexchange.com has the wrong answer which accepted as solution with 10 up votes:

which is, why magento2 uses by default shared=false

It is wrong!

Magento 2 always use true as default value of shared:

magento/magento2/blob/1.0.0-beta/lib/internal/Magento/Framework/ObjectManager/Config/Config.php#L247-L253


      
          if (isset($curConfig['shared'])) {
              if (!$curConfig['shared']) {
                  $this->_nonShared[$key] = 1;
              } else {
                  unset($this->_nonShared[$key]);
              }
          }

github.com

magento/magento2/blob/1.0.0-beta/lib/internal/Magento/Framework/Event/Invoker/InvokerDefault.php#L56-L60


      
          if (isset($configuration['shared']) && false === $configuration['shared']) {
              $object = $this->_observerFactory->create($configuration['instance']);
          } else {
              $object = $this->_observerFactory->get($configuration['instance']);
          }