[10.x] Expand on better transaction manager design

src/Illuminate/Database/Concerns/ManagesTransactions.php

@@ -9,6 +9,9 @@
 
 trait ManagesTransactions
 {
+    /** @var \Illuminate\Database\DatabaseTransactionRecord|null */
+    protected $currentTransaction = null;
+
     /**
      * Execute a Closure within a transaction.
      *
@@ -207,7 +210,6 @@ public function commit()
         $this->transactionsManager?->commit(
             $this->getName(), $levelBeingCommitted, $this->transactions
         );
-
         $this->fireConnectionEvent('committed');
     }
 

src/Illuminate/Database/DatabaseTransactionRecord.php

@@ -2,6 +2,8 @@
 
 namespace Illuminate\Database;
 
+use Illuminate\Support\Collection;
+
 class DatabaseTransactionRecord
 {
     /**
@@ -25,6 +27,27 @@ class DatabaseTransactionRecord
      */
     public $parent;
 
+    /**
+     * The child instances of this transaction.
+     *
+     * @var \Illuminate\Support\Collection<int, \Illuminate\Database\DatabaseTransactionRecord[]>
+     */
+    protected $children;
+
+    /**
+     * Whether the transaction has been committed.
+     *
+     * @var bool
+     */
+    public $committed = false;
+
+    /**
+     * Whether the transaction has executed its callbacks.
+     *
+     * @var bool
+     */
+    public $executedCallbacks = false;
+
     /**
      * The callbacks that should be executed after committing.
      *
@@ -45,6 +68,37 @@ public function __construct($connection, $level, ?DatabaseTransactionRecord $par
         $this->connection = $connection;
         $this->level = $level;
         $this->parent = $parent;
+        $this->children = new Collection();
+    }
+
+    /**
+     * Get the transaction's children.
+     *
+     * @return \Illuminate\Support\Collection<int, \Illuminate\Database\DatabaseTransactionRecord[]>
+     */
+    public function getChildren()
+    {
+        return $this->children;
+    }
+
+    public function setParent(DatabaseTransactionRecord $parent)
+    {
+        $this->parent = $parent;
+    }
+
+    /**
+     * @param \Illuminate\Database\DatabaseTransactionRecord $transaction
+     * @return void
+     */
+    public function addChild($transaction)
+    {
+        $transaction->setParent($this);
+        $this->children[] = $transaction;
+    }
+
+    public function resetChildren()
+    {
+        $this->children = new Collection();
     }
 
     /**
@@ -65,9 +119,15 @@ public function addCallback($callback)
      */
     public function executeCallbacks()
     {
+        foreach ($this->children as $child) {
+            $child->executeCallbacks();
+        }
+
         foreach ($this->callbacks as $callback) {
             $callback();
         }
+
+        $this->executedCallbacks = true;
     }
 
     /**
@@ -79,4 +139,24 @@ public function getCallbacks()
     {
         return $this->callbacks;
     }
+
+    public function resetCallbacks()
+    {
+        $this->callbacks = [];
+    }
+
+    public function removeChild(DatabaseTransactionRecord $currentTransaction): void
+    {
+        $this->children = $this->children->reject(fn ($transaction) => $transaction === $currentTransaction)->values();
+    }
+
+    public function commit()
+    {
+        $this->committed = true;
+    }
+
+    public function isRootLevelTransaction()
+    {
+        return $this->level === 1;
+    }
 }