Cache the tree nodes list generated for StructuralEntityType.

config/packages/cache.yaml

@@ -2,7 +2,7 @@ framework:
     cache:
         # Put the unique name of your app here: the prefix seed
         # is used to compute stable namespaces for cache keys.
-        #prefix_seed: your_vendor_name/app_name
+        prefix_seed: Part-DB/Part-DB
 
         # The app cache caches to the filesystem by default.
         # Other options include:
@@ -15,5 +15,8 @@ framework:
         #app: cache.adapter.apcu
 
         # Namespaced pools use the above "app" backend by default
-        #pools:
-            #my.dedicated.cache: ~
+        pools:
+            # Here all things related to cache the tree structures
+            tree.cache:
+              adapter: cache.app
+              tags: true

config/services.yaml

@@ -37,6 +37,12 @@ services:
         tags:
             - { name: "doctrine.orm.entity_listener" }
 
+    tree_invalidation_listener:
+        class: App\EntityListeners\TreeCacheInvalidationListener
+        tags:
+            - { name: doctrine.orm.entity_listener }
+
+
     App\Command\UpdateExchangeRatesCommand:
         arguments:
             $base_current: '%default_currency%'

src/Entity/Base/StructuralDBElement.php

@@ -72,6 +72,8 @@ use Symfony\Component\Serializer\Annotation\Groups;
  *
  * @ORM\MappedSuperclass(repositoryClass="App\Repository\StructuralDBElementRepository")
  *
+ * @ORM\EntityListeners({"App\Security\EntityListeners\ElementPermissionListener", "App\EntityListeners\TreeCacheInvalidationListener"})
+ *
  * @UniqueEntity(fields={"name", "parent"}, ignoreNull=false, message="structural.entity.unique_name")
  */
 abstract class StructuralDBElement extends AttachmentContainingDBElement

src/EntityListeners/TreeCacheInvalidationListener.php

@@ -0,0 +1,84 @@
+<?php
+/**
+ *
+ * part-db version 0.1
+ * Copyright (C) 2005 Christoph Lechner
+ * http://www.cl-projects.de/
+ *
+ * part-db version 0.2+
+ * Copyright (C) 2009 K. Jacobs and others (see authors.php)
+ * http://code.google.com/p/part-db/
+ *
+ * Part-DB Version 0.4+
+ * Copyright (C) 2016 - 2019 Jan Böhmer
+ * https://github.com/jbtronics
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ *
+ */
+
+namespace App\EntityListeners;
+
+
+use App\Entity\Base\DBElement;
+use App\Entity\Base\StructuralDBElement;
+use App\Entity\UserSystem\Group;
+use App\Entity\UserSystem\User;
+use Doctrine\ORM\Event\LifecycleEventArgs;
+use Doctrine\ORM\Event\PostFlushEventArgs;
+use Doctrine\ORM\Event\PreFlushEventArgs;
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Contracts\Cache\TagAwareCacheInterface;
+
+class TreeCacheInvalidationListener
+{
+    protected $cache;
+
+    public function __construct(TagAwareCacheInterface $treeCache)
+    {
+        $this->cache = $treeCache;
+    }
+
+    /**
+     * @ORM\PostUpdate()
+     * @ORM\PostPersist()
+     * @ORM\PostRemove()
+     *
+     * @param DBElement $element
+     * @param LifecycleEventArgs $event
+     */
+    public function invalidate(DBElement $element, LifecycleEventArgs $event)
+    {
+        //If an element was changed, then invalidate all cached trees with this element class
+        if ($element instanceof StructuralDBElement) {
+            $secure_class_name = str_replace("\\", '_', get_class($element));
+            $this->cache->invalidateTags([$secure_class_name]);
+        }
+
+        //If a user change, then invalidate all cached trees for him
+        if ($element instanceof User) {
+            $tag = "user_" . $element->getUsername();
+            $this->cache->invalidateTags([$tag]);
+        }
+
+        /* If any group change, then invalidate all cached trees. Users Permissions can be inherited from groups,
+            so a change in any group can cause big permisssion changes for users. So to be sure, invalidate all trees */
+        if($element instanceof Group) {
+            $tag = "groups";
+            $this->cache->invalidateTags([$tag]);
+        }
+
+    }
+}

src/Form/Type/StructuralEntityType.php

@@ -35,6 +35,7 @@ namespace App\Form\Type;
 use App\Entity\Base\StructuralDBElement;
 use App\Entity\Parts\Storelocation;
 use App\Repository\StructuralDBElementRepository;
+use App\Services\TreeBuilder;
 use Doctrine\ORM\EntityManagerInterface;
 use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\ChoiceList\Loader\CallbackChoiceLoader;
@@ -54,10 +55,13 @@ class StructuralEntityType extends AbstractType
 {
     protected $em;
     protected $options;
+    /** @var TreeBuilder  */
+    protected $builder;
 
-    public function __construct(EntityManagerInterface $em)
+    public function __construct(EntityManagerInterface $em, TreeBuilder $builder)
     {
         $this->em = $em;
+        $this->builder = $builder;
     }
 
     public function configureOptions(OptionsResolver $resolver)
@@ -122,9 +126,12 @@ class StructuralEntityType extends AbstractType
     {
         $this->options = $options;
 
+        $choices = $this->builder->typeToNodesList($options['class'], null);
+
+
         /** @var StructuralDBElementRepository $repo */
-        $repo = $this->em->getRepository($options['class']);
-        $choices = $repo->toNodesList(null);
+        /*$repo = $this->em->getRepository($options['class']);
+        $choices = $repo->toNodesList(null); */
         return $choices;
     }
 

src/Services/TreeBuilder.php

@@ -37,7 +37,16 @@ use App\Entity\Base\StructuralDBElement;
 use App\Helpers\TreeViewNode;
 use App\Repository\StructuralDBElementRepository;
 use Doctrine\ORM\EntityManagerInterface;
+use Psr\Cache\CacheItemPoolInterface;
 use Symfony\Bundle\MakerBundle\Str;
+use Symfony\Component\Cache\Adapter\AdapterInterface;
+use Symfony\Component\Cache\Adapter\FilesystemAdapter;
+use Symfony\Component\Cache\Adapter\TagAwareAdapter;
+use Symfony\Component\Cache\Adapter\TagAwareAdapterInterface;
+use Symfony\Component\Security\Core\Security;
+use Symfony\Contracts\Cache\CacheInterface;
+use Symfony\Contracts\Cache\ItemInterface;
+use Symfony\Contracts\Cache\TagAwareCacheInterface;
 use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
@@ -50,12 +59,17 @@ class TreeBuilder
     protected $url_generator;
     protected $em;
     protected $translator;
+    protected $cache;
+    protected $security;
 
-    public function __construct(EntityURLGenerator $URLGenerator, EntityManagerInterface $em, TranslatorInterface $translator)
+    public function __construct(EntityURLGenerator $URLGenerator, EntityManagerInterface $em,
+                                TranslatorInterface $translator, TagAwareCacheInterface $treeCache, Security $security)
     {
         $this->url_generator = $URLGenerator;
         $this->em = $em;
         $this->translator = $translator;
+        $this->security = $security;
+        $this->cache = $treeCache;
     }
 
     /**
@@ -149,4 +163,34 @@ class TreeBuilder
 
         return $array;
     }
+
+    /**
+     * Gets a flattened hierachical tree. Useful for generating option lists.
+     * In difference to the Repository Function, the results here are cached.
+     * @param string $class_name The class name of the entity you want to retrieve.
+     * @param StructuralDBElement|null $parent This entity will be used as root element. Set to null, to use global root
+     * @return StructuralDBElement[] A flattened list containing the tree elements.
+     * @throws \Psr\Cache\InvalidArgumentException
+     */
+    public function typeToNodesList(string $class_name, ?StructuralDBElement $parent = null): array
+    {
+        $username = $this->security->getUser()->getUsername();
+        $parent_id = $parent != null ? $parent->getID() : "0";
+        // Backslashes are not allowed in cache keys
+        $secure_class_name = str_replace("\\", '_', $class_name);
+        $key = "list_" . $username . "_" . $secure_class_name . $parent_id;
+
+        $ret = $this->cache->get($key, function (ItemInterface $item) use ($class_name, $parent, $secure_class_name, $username) {
+            // Invalidate when groups, a element with the class or the user changes
+            $item->tag(['groups', 'tree_list', 'user_' . $username, $secure_class_name]);
+            /**
+             * @var $repo StructuralDBElementRepository
+             */
+            $repo = $this->em->getRepository($class_name);
+
+            return $repo->toNodesList($parent);
+        });
+
+        return $ret;
+    }
 }