Skip tracking affected relations and concepts for RELATION lastAccess…

…[SESSION*DateTime]

changelog.md

@@ -11,6 +11,7 @@ Additional labels for pre-release and build metadata are available as extensions
 
 ## Unreleased changes
 * [Issue 79](https://github.com/AmpersandTarski/prototype/issues/79) Add support for delimited multi value columns in excel importer
+* Skip tracking affected relations and concepts for RELATION lastAccess[SESSION*DateTime]
 * Add codebase of new developed frontend. Not integrated in building image yet.
 
 ## v1.17.0 (24 may 2023)

src/Ampersand/Core/Atom.php

@@ -177,9 +177,9 @@ public function getSmallest(): Atom
     /**
      * Add atom to concept
      */
-    public function add(bool $populateDefaults = true): self
+    public function add(bool $populateDefaults = true, bool $trackAffected = true): self
     {
-        $this->concept->addAtom($this, $populateDefaults);
+        $this->concept->addAtom($this, $populateDefaults, $trackAffected);
         return $this;
     }
 

src/Ampersand/Core/Concept.php

@@ -544,7 +544,7 @@ public function makeAtom(string $atomId): Atom
      *
      * @param bool $populateDefaults specifies if default src/tgt values for relations must be populated also
      */
-    public function addAtom(Atom $atom, bool $populateDefaults = true): Atom
+    public function addAtom(Atom $atom, bool $populateDefaults = true, bool $trackAffected = true): Atom
     {
         // Adding atom[A] to [A] ($this)
         if ($atom->concept === $this) {
@@ -553,7 +553,11 @@ public function addAtom(Atom $atom, bool $populateDefaults = true): Atom
             } else {
                 $this->logger->debug("Add atom {$atom} to plug");
                 $transaction = $this->app->getCurrentTransaction();
-                $transaction->addAffectedConcept($this); // Add concept to affected concepts. Needed for conjunct evaluation and transaction management
+
+                if ($trackAffected) {
+                    // Add concept to affected concepts. Needed for conjunct evaluation and transaction management
+                    $transaction->addAffectedConcept($this);
+                }
 
                 foreach ($this->getPlugs() as $plug) {
                     $plug->addAtom($atom); // Add to plug
@@ -583,7 +587,7 @@ public function addAtom(Atom $atom, bool $populateDefaults = true): Atom
             }
 
             $atom->concept = $this; // Change concept definition
-            return $this->addAtom($atom, false);
+            return $this->addAtom($atom, false, $trackAffected);
         }
     }
 

src/Ampersand/Core/Link.php

@@ -76,9 +76,9 @@ public function exists(): bool
     /**
      * Add link relation set
      */
-    public function add(): self
+    public function add(bool $trackAffected = true): self
     {
-        $this->rel->addLink($this);
+        $this->rel->addLink($this, $trackAffected);
         return $this;
     }
 

src/Ampersand/Core/Relation.php

@@ -235,15 +235,19 @@ public function getAllLinks(?Atom $srcAtom = null, ?Atom $tgtAtom = null): array
     /**
      * Add link to this relation
      */
-    public function addLink(Link $link): void
+    public function addLink(Link $link, bool $trackAffected = true): void
     {
         $this->logger->debug("Add link {$link} to plug");
         $transaction = $this->app->getCurrentTransaction();
-        $transaction->addAffectedRelations($this); // Add relation to affected relations. Needed for conjunct evaluation and transaction management
+
+        if ($trackAffected) {
+            // Add relation to affected relations. Needed for conjunct evaluation and transaction management
+            $transaction->addAffectedRelations($this);
+        }
 
         // Ensure that atoms exist in their concept tables
-        $link->src()->add(false); // TODO: remove when we know for sure that this is guaranteed by calling functions
-        $link->tgt()->add(false); // TODO: remove when we know for sure that this is guaranteed by calling functions
+        $link->src()->add(false, $trackAffected); // TODO: remove when we know for sure that this is guaranteed by calling functions
+        $link->tgt()->add(false, $trackAffected); // TODO: remove when we know for sure that this is guaranteed by calling functions
 
         foreach ($this->getPlugs() as $plug) {
             $plug->addLink($link);

src/Ampersand/Session.php

@@ -129,7 +129,10 @@ public function initSessionAtom(): void
         // $_SESSION['lastAccess'] = $now;
 
         // Update lastAccess time also in plug/database to allow to use this aspect in Ampersand models
-        $this->sessionAtom->link(date(DATE_ATOM, $now), 'lastAccess[SESSION*DateTime]', false)->add();
+        // We set 'trackAffected' to false for this relation, because it will significantly reduce the rule evaluation overhead
+        // for every session interaction. We can safely do this, because no new Session atom is implicitly created here nor does
+        // the DateTime atom is reused elsewhere
+        $this->sessionAtom->link(date(DATE_ATOM, $now), 'lastAccess[SESSION*DateTime]', false)->add(trackAffected: false);
     }
 
     /**