MDL-22145 backup storage - provide 'user_tohub' storage for HUB files

backup/util/plan/backup_execution_step.class.php

@@ -31,7 +31,7 @@ abstract class backup_execution_step extends backup_step {
 
     public function execute() {
         // Simple, for now
-        $this->define_execution();
+        return $this->define_execution();
     }
 
 // Protected API starts here

backup/util/plan/base_plan.class.php

@@ -32,6 +32,7 @@ abstract class base_plan implements checksumable, executable {
     protected $name;      // One simple name for identification purposes
     protected $settings;  // One array of (accumulated from tasks) base_setting elements
     protected $tasks;     // One array of base_task elements
+    protected $results;   // One array of results received from tasks
 
     protected $built;     // Flag to know if one plan has been built
 
@@ -42,6 +43,7 @@ abstract class base_plan implements checksumable, executable {
         $this->name = $name;
         $this->settings = array();
         $this->tasks    = array();
+        $this->results  = array();
         $this->built = false;
     }
 
@@ -68,6 +70,14 @@ abstract class base_plan implements checksumable, executable {
         return $this->tasks;
     }
 
+    public function add_result($result) {
+        $this->results = array_merge($this->results, $result);
+    }
+
+    public function get_results() {
+        return $this->results;
+    }
+
     public function get_settings() {
         return $this->settings;
     }

backup/util/plan/base_task.class.php

@@ -144,7 +144,12 @@ abstract class base_task implements checksumable, executable, loggable {
             throw new base_task_exception('base_task_not_built', $this->name);
         }
         foreach ($this->steps as $step) {
-            $step->execute();
+            $result = $step->execute();
+            // If step returns array, it will be forwarded to plan
+            // (TODO: shouldn't be array but proper result object)
+            if (is_array($result) and !empty($result)) {
+                $this->plan->add_result($result);
+            }
         }
     }