Session plugin modernization.

- Renamed services.
- Moved configuration to plugin manager.

module/VuFind/config/module.config.php

@@ -665,20 +665,7 @@ $config = [
                     'tags' => 'VuFind\Search\Results\Factory::getTags',
                 ],
             ],
-            'session' => [
-                'abstract_factories' => ['VuFind\Session\PluginFactory'],
-                'invokables' => [
-                    'database' => 'VuFind\Session\Database',
-                    'file' => 'VuFind\Session\File',
-                    'memcache' => 'VuFind\Session\Memcache',
-                ],
-                'aliases' => [
-                    // for legacy 1.x compatibility
-                    'filesession' => 'File',
-                    'memcachesession' => 'Memcache',
-                    'mysqlsession' => 'Database',
-                ],
-            ]
+            'session' => [ /* see VuFind\Session\PluginManager for defaults */ ],
         ],
         // This section behaves just like recorddriver_tabs below, but is used for
         // the collection module instead of the standard record view.

module/VuFind/src/VuFind/Session/PluginManager.php

@@ -38,6 +38,48 @@ namespace VuFind\Session;
  */
 class PluginManager extends \VuFind\ServiceManager\AbstractPluginManager
 {
+    /**
+     * Default plugin aliases.
+     *
+     * @var array
+     */
+    protected $aliases = [
+        'database' => 'VuFind\Session\Database',
+        'file' => 'VuFind\Session\File',
+        'memcache' => 'VuFind\Session\Memcache',
+        // for legacy 1.x compatibility
+        'filesession' => 'VuFind\Session\File',
+        'memcachesession' => 'VuFind\Session\Memcache',
+        'mysqlsession' => 'VuFind\Session\Database',
+    ];
+
+    /**
+     * Default plugin factories.
+     *
+     * @var array
+     */
+    protected $factories = [
+        'VuFind\Session\Database' => 'Zend\ServiceManager\Factory\InvokableFactory',
+        'VuFind\Session\File' => 'Zend\ServiceManager\Factory\InvokableFactory',
+        'VuFind\Session\Memcache' => 'Zend\ServiceManager\Factory\InvokableFactory',
+    ];
+
+    /**
+     * Constructor
+     *
+     * Make sure plugins are properly initialized.
+     *
+     * @param mixed $configOrContainerInstance Configuration or container instance
+     * @param array $v3config                  If $configOrContainerInstance is a
+     * container, this value will be passed to the parent constructor.
+     */
+    public function __construct($configOrContainerInstance = null,
+        array $v3config = []
+    ) {
+        $this->addAbstractFactory('VuFind\Session\PluginFactory');
+        parent::__construct($configOrContainerInstance, $v3config);
+    }
+
     /**
      * Return the name of the base class or interface that plug-ins must conform
      * to.