Continued:

- added more checks on parameter
- added more debug lines

diff --git a/framework/main/classes/handler/class_BaseHandler.php b/framework/main/classes/handler/class_BaseHandler.php
index 47bfc2d5c59a4b812cd079faf88e1d8f31c1f2aa..a492266cc91025109172f29529630c61c53b978e 100644 (file)
--- a/framework/main/classes/handler/class_BaseHandler.php
+++ b/framework/main/classes/handler/class_BaseHandler.php
@@ -4,9 +4,13 @@ namespace Org\Mxchange\CoreFramework\Handler;
 
 // Import framework stuff
 use Org\Mxchange\CoreFramework\Criteria\Storing\StoreableCriteria;
+use Org\Mxchange\CoreFramework\Generic\FrameworkInterface;
 use Org\Mxchange\CoreFramework\Handler\DataSet\HandleableDataSet;
 use Org\Mxchange\CoreFramework\Object\BaseFrameworkSystem;
 
+// Import SPL stuff
+use \InvalidArgumentException;
+
 /**
  * A general Handler
  *
@@ -43,7 +47,11 @@ abstract class BaseHandler extends BaseFrameworkSystem implements HandleableData
         */
        protected function __construct (string $className) {
                // Call parent constructor
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('BASE-HANDLER: className=%s - CONSTRUCTED!', $className));
                parent::__construct($className);
+
+               // Trace message
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('BASE-HANDLER: EXIT!');
        }
 
        /**
@@ -74,6 +82,15 @@ abstract class BaseHandler extends BaseFrameworkSystem implements HandleableData
         * @todo        Rewrite this to use DHT
         */
        public function addArrayToDataSet (StoreableCriteria $dataSetInstance, array $messageData) {
+               // Check parameter
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('BASE-HANDLER: dataSetInstance=%s,messageData()=%d - CALLED!', $dataSetInstance->__toString(), count($messageData)));
+               if (count($messageData) == 0) {
+                       // Throw IAE
+                       throw new InvalidArgumentException('Parameter "messageData" is an empty array', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
+               }
+
+               // Trace message
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('BASE-HANDLER: EXIT!');
        }
 
 }

diff --git a/framework/main/classes/handler/tasks/class_TaskHandler.php b/framework/main/classes/handler/tasks/class_TaskHandler.php
index 792073e136a9a3063d0175159355b848e38a3266..93963c8aee78b5e56f46aeefc264dc938f14a026 100644 (file)
--- a/framework/main/classes/handler/tasks/class_TaskHandler.php
+++ b/framework/main/classes/handler/tasks/class_TaskHandler.php
@@ -56,10 +56,15 @@ class TaskHandler extends BaseHandler implements Registerable, HandleableTask {
         */
        private function __construct () {
                // Call parent constructor
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('TASK-HANDLER: CONSTRUCTWD!');
                parent::__construct(__CLASS__);
 
                // Set handler name
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugMessage('TASK-HANDLER: Setting handlerName=task ...');
                $this->setHandlerName('task');
+
+               // Trace message
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('TASK-HANDLER: EXIT!');
        }
 
        /**
@@ -69,10 +74,11 @@ class TaskHandler extends BaseHandler implements Registerable, HandleableTask {
         */
        public static final function createTaskHandler () {
                // Get new instance
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('TASK-HANDLER: CALLED!');
                $handlerInstance = new TaskHandler();
 
                // Output debug message
-               self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('TASK-HANDLER: Initializing task handler.');
+               self::createDebugInstance(__CLASS__, __LINE__)->debugMessage('TASK-HANDLER: Initializing task handler.');
 
                // Init the task list
                $handlerInstance->setListInstance(ObjectFactory::createObjectByConfiguredName('task_list_class'));
@@ -88,9 +94,10 @@ class TaskHandler extends BaseHandler implements Registerable, HandleableTask {
                $handlerInstance->registerTask('idle_loop', $taskInstance);
 
                // Output debug message
-               self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('TASK-HANDLER: Task handler initialized.');
+               self::createDebugInstance(__CLASS__, __LINE__)->debugMessage('TASK-HANDLER: Task handler initialized.');
 
                // Return the prepared instance
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('TASK-HANDLER:handlerInstance=%s - EXIT!', $handlerInstance->__toString()));
                return $handlerInstance;
        }
 
@@ -104,6 +111,7 @@ class TaskHandler extends BaseHandler implements Registerable, HandleableTask {
         */
        private function executeCurrentTask () {
                // Update no task by default
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('TASK-HANDLER: CALLED!');
                $updateTask = false;
 
                // Is the current task valid?
@@ -116,14 +124,17 @@ class TaskHandler extends BaseHandler implements Registerable, HandleableTask {
                $currentTask = $this->getListInstance()->getIterator()->current();
 
                // Is the task not yet started?
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugMessage(sprintf('TASK-HANDLER: currentTask()=%d', count($currentTask)));
                if ($currentTask['task_started'] === false) {
                        // Determine difference between current time and registration
+                       /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugMessage(sprintf('TASK-HANDLER: currentTask[id]=%s has not started yet, checking ...', $currentTask['id']));
                        $diff = ($this->getMilliTime() - $currentTask['task_registered']) * 1000;
 
                        // Should we start now?
+                       /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugMessage(sprintf('TASK-HANDLER: diff=%d,currentTask[task_startup_delay]=%d', $diff, $currentTask['task_startup_delay']));
                        if ($diff < $currentTask['task_startup_delay']) {
                                // Skip this silently
-                               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('TASK-HANDLER: Task ' . $currentTask['id'] . ' not started: diff=' . $diff . ',task_startup_delay=' . $currentTask['task_startup_delay']);
+                               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('TASK-HANDLER: Task %s not started: diff=%d,task_startup_delay=%d', $currentTask['id'], $diff, $currentTask['task_startup_delay']));
                                return;
                        }
 
@@ -132,22 +143,25 @@ class TaskHandler extends BaseHandler implements Registerable, HandleableTask {
                        $updateTask = true;
 
                        // Debug message
-                       self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('TASK-HANDLER: Task ' . $currentTask['id'] . ' started with startup_delay=' . $currentTask['task_startup_delay'] . 'ms');
+                       self::createDebugInstance(__CLASS__, __LINE__)->debugMessage(sprintf('TASK-HANDLER: Task %s started with startup_delay=%dms', $currentTask['id'], $currentTask['task_startup_delay']));
                }
 
                // Get time difference from interval delay
                $diff = ($this->getMilliTime() - $currentTask['task_last_activity']) * 1000;
 
                // Is the interval delay reached?
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('TASK-HANDLER: Task ' . $currentTask['id'] . ' diff=' . $diff . ',task_interval_delay=' . $currentTask['task_interval_delay'] . ',task_max_runs=' . $currentTask['task_max_runs'] . ',task_total_runs=' . $currentTask['task_total_runs']);
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugMessage('TASK-HANDLER: Task ' . $currentTask['id'] . ' diff=' . $diff . ',task_interval_delay=' . $currentTask['task_interval_delay'] . ',task_max_runs=' . $currentTask['task_max_runs'] . ',task_total_runs=' . $currentTask['task_total_runs']);
                if ((($diff < $currentTask['task_interval_delay']) && ($currentTask['task_max_runs'] == 0)) || (($currentTask['task_max_runs'] > 0) && ($currentTask['task_total_runs'] == $currentTask['task_max_runs']))) {
                        // Should we update the task from startup?
+                       /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugMessage(sprintf('TASK-HANDLER: currentTask[id]=%s has reached interval ... updateTask=%d', $currentTask['id'], intval($updateTask)));
                        if ($updateTask === true) {
                                // Update the task before leaving
+                               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugMessage(sprintf('TASK-HANDLER: Updating task %s ...', $currentTask['id']));
                                $this->updateTask($currentTask);
                        }
 
                        // Skip this silently
+                       /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('TASK-HANDLER: Task %s has been updated - EXIT!', $currentTask['id']));
                        return;
                }
 
@@ -158,11 +172,16 @@ class TaskHandler extends BaseHandler implements Registerable, HandleableTask {
                $currentTask['task_total_runs']++;
 
                // Update the task
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugMessage(sprintf('TASK-HANDLER: Updating task %s ...', $currentTask['id']));
                $this->updateTask($currentTask);
 
                // And visit/run it
                // @TODO Messurement can be added around this call
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('TASK-HANDLER: Invoking currentTask[task_instance]->accept(%s), task_instance=%s ...', $this->getVisitorInstance()->__toString(), $currentTask['task_instance']->__toString()));
                $currentTask['task_instance']->accept($this->getVisitorInstance());
+
+               // Trace message
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('TASK-HANDLER: EXIT!');
        }
 
        /**
@@ -173,13 +192,19 @@ class TaskHandler extends BaseHandler implements Registerable, HandleableTask {
         */
        private function updateTask (array $taskEntry) {
                // Get the key from current iteration
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('TASK-HANDLER: taskEntry()=%d - CALLED!', count($taskEntry)));
                $key = $this->getListInstance()->getIterator()->key();
 
                // Get the hash from key
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugMessage(sprintf('TASK-HANDLER: key=%s', $key));
                $hash = $this->getListInstance()->getHashByIndex($key);
 
                // Update the entry
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('TASK-HANDLER: Invoking this->listInstance->updateCurrentEntryByHash(%s,taskEntry()=%d) ...', $hash, count($taskEntry)));
                $this->getListInstance()->updateCurrentEntryByHash($hash, $taskEntry);
+
+               // Trace message
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('TASK-HANDLER: EXIT!');
        }
 
        /**
@@ -189,14 +214,12 @@ class TaskHandler extends BaseHandler implements Registerable, HandleableTask {
         * @return      void
         */
        private function unregisterTask (array $taskData) {
-               // Debug output
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('TASK-HANDLER: Removing task ' . $taskData['id'] . ' from queue - CALLED!');
-
                // Remove the entry
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('TASK-HANDLER: Removing task %s from queue - CALLED!', $taskData['id']));
                $this->getListInstance()->removeEntry('tasks', $taskData);
 
-               // Debug output
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('TASK-HANDLER: Removing task ' . $taskData['id'] . ' from queue - EXIT!');
+               // Trace message
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('TASK-HANDLER: Removing task %s from queue - EXIT!', $taskData['id']));
         }
 
        /**
@@ -207,24 +230,29 @@ class TaskHandler extends BaseHandler implements Registerable, HandleableTask {
         */
        public function searchTask (Taskable $taskInstance) {
                // Default is an empty (not found) task name
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('TASK-HANDLER: taskInstance=%s - CALLED!', $taskInstance->__toString()));
                $taskName = '';
 
                // Get whole list
                $taskList = $this->getListInstance()->getArrayFromList('tasks');
 
                // Search all instances
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugMessage(sprintf('TASK-HANDLER: taskList()=%d', count($taskList)));
                foreach ($taskList as $currentTask) {
                        // Does it match given task instance?
+                       /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugMessage(sprintf('TASK-HANDLER: currentTask[id=%s', $currentTask['id']));
                        if ($currentTask['task_instance']->equals($taskInstance)) {
                                // Found it
                                $taskName = $currentTask['id'];
 
                                // Abort here
+                               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugMessage(sprintf('TASK-HANDLER: taskName=%s - BREAK!', $taskName));
                                break;
                        }
                }
 
                // Return found name
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('TASK-HANDLER: taskName=%s - EXIT!', $taskName));
                return $taskName;
        }
 
@@ -239,6 +267,7 @@ class TaskHandler extends BaseHandler implements Registerable, HandleableTask {
         */
        public function registerTask (string $taskName, Taskable $taskInstance) {
                // Is the parameter valid
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('TASK-HANDLER: taskName=%s,taskInstance - CALLED!', $taskName, $taskInstance->__toString()));
                if (empty($taskName)) {
                        // Task name cannot be empty
                        throw new InvalidArgumentException('Parameter "taskName" is empty', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
@@ -250,6 +279,7 @@ class TaskHandler extends BaseHandler implements Registerable, HandleableTask {
                $maxRuns = FrameworkBootstrap::getConfigurationInstance()->getConfigEntry('task_' . $taskName . '_max_runs');
 
                // If the task is 'idle_loop', a deplay of zero seconds is fine
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugMessage(sprintf('TASK-HANDLER: intervalDelay=%d,startupDelay=%d,maxRuns=%d', $intervalDelay, $startupDelay, $maxRuns));
                if ($intervalDelay < 0) {
                        // Invalid configuration value
                        throw new UnexpectedValueException(sprintf('taskName=%s has intervalDelay=%d below zero', $taskName, $intervalDelay), FrameworkInterface::EXCEPTION_UNEXPECTED_VALUE);
@@ -294,15 +324,20 @@ class TaskHandler extends BaseHandler implements Registerable, HandleableTask {
                ];
 
                // Add the entry
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('TASK-HANDLER: Invoking this->listInstance->addEntry(tasks,taskEntry()=%d) ...', count($taskEntry)));
                $this->getListInstance()->addEntry('tasks', $taskEntry);
 
                // Debug message
-               self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('TASK-HANDLER: Task registered: taskName=' . $taskName .
-                       ' (taskInstance=' . $taskInstance->__toString() . ')' .
-                       ', startupDelay=' . $taskEntry['task_startup_delay'] . 'ms' .
-                       ', intervalDelay=' . $taskEntry['task_interval_delay'] . 'ms' .
-                       ', maxRuns=' . $taskEntry['task_max_runs'] . ' ...'
-               );
+               self::createDebugInstance(__CLASS__, __LINE__)->debugMessage(sprintf('TASK-HANDLER: Task registered: taskName=%s (taskInstance=%s), startupDelay=%dms, intervalDelay=%dms, maxRuns=%d ...',
+                       $taskName,
+                       $taskInstance->__toString(),
+                       $taskEntry['task_startup_delay'],
+                       $taskEntry['task_interval_delay'],
+                       $taskEntry['task_max_runs'],
+               ));
+
+               // Trace message
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('TASK-HANDLER: EXIT!');
        }
 
        /**
@@ -312,9 +347,11 @@ class TaskHandler extends BaseHandler implements Registerable, HandleableTask {
         */
        public function hasTasksLeft () {
                // Do we have tasks there?
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('TASK-HANDLER: CALLED!');
                $tasksLeft = ($this->getListInstance()->count() > 0);
 
                // Return result
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('TASK-HANDLER: tasksLeft=%d - EXIT!', intval($tasksLeft)));
                return $tasksLeft;
        }
 
@@ -328,16 +365,23 @@ class TaskHandler extends BaseHandler implements Registerable, HandleableTask {
         */
        public function handleTasks () {
                // Should we rewind?
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('TASK-HANDLER: CALLED!');
                if (!$this->getListInstance()->getIterator()->valid()) {
                        // Rewind to the beginning for next loop
+                       /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('TASK-HANDLER: Invoking this->listInstance->iterator->rewind() ...');
                        $this->getListInstance()->getIterator()->rewind();
                }
 
                // Try to execute the task
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('TASK-HANDLER: Invoking this->executeCurrentTask() ...');
                $this->executeCurrentTask();
 
                // Go to next entry
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('TASK-HANDLER: Invoking this->listInstance->iterator->next() ...');
                $this->getListInstance()->getIterator()->next();
+
+               // Trace message
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('TASK-HANDLER: EXIT!');
        }
 
        /**
@@ -348,15 +392,15 @@ class TaskHandler extends BaseHandler implements Registerable, HandleableTask {
         */
        public function doShutdown () {
                // Always rewind to the beginning for next loop
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('TASK-HANDLER: Invoking this->listInstance->iterator->rewind() - CALLED!');
                $this->getListInstance()->getIterator()->rewind();
 
-               // Debug message
-               self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('TASK-HANDLER: Shutting down all ' . $this->getListInstance()->count() . ' tasks...');
-
                // Remember all tasks that has been shutdown for removal
+               self::createDebugInstance(__CLASS__, __LINE__)->debugMessage(sprintf('TASK-HANDLER: Shutting down all %d tasks...', $this->getListInstance()->count()));
                $tasks = [];
 
                // Instance a visitor
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugMessage('TASK-HANDLER: Setting visitorInstance=shutdown_task_visitor_class from configuration ...');
                $this->setVisitorInstance(ObjectFactory::createObjectByConfiguredName('shutdown_task_visitor_class'));
 
                // Shutdown all tasks in once go
@@ -364,26 +408,28 @@ class TaskHandler extends BaseHandler implements Registerable, HandleableTask {
                        // Get current entry
                        $currentTask = $this->getListInstance()->getIterator()->current();
 
-                       // Output debug message
-                       self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('TASK-HANDLER: Shutting down task ' . $currentTask['id'] . ' (taskInstance=' . $currentTask['task_instance']->__toString() . ') ...');
-
                        // Shutdown the task
+                       /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugMessage('TASK-HANDLER: Shutting down task ' . $currentTask['id'] . ' (taskInstance=' . $currentTask['task_instance']->__toString() . ') ...');
                        $currentTask['task_instance']->accept($this->getVisitorInstance());
 
                        // Remember this task
                        array_push($tasks, $currentTask);
 
                        // Advance to next one
+                       /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('TASK-HANDLER: Invoking this->listInstance->iterator->next() ...');
                        $this->getListInstance()->getIterator()->next();
                }
 
-               // Debug message
-               self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('TASK-HANDLER: Shutdown of all tasks completed.');
-
                // Remove all tasks
-               foreach ($tasks as $entry) {
-                       $this->unregisterTask($entry);
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugMessage(sprintf('TASK-HANDLER: Shutdown of all tasks completed. tasks()=%d', count($tasks)));
+               foreach ($tasks as $taskEntry) {
+                       // Unregister this task
+                       /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('TASK-HANDLER: Invokint this->unregisterTask(taskEntry()=%d) ...', count($taskEntry)));
+                       $this->unregisterTask($taskEntry);
                }
+
+               // Trace message
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('TASK-HANDLER: EXIT!');
        }
 
 }

diff --git a/framework/main/classes/helper/class_BaseHelper.php b/framework/main/classes/helper/class_BaseHelper.php
index 5c6ab7520d910245e58098f4d34cdec48dde0050..f32b3618a4cf4e4bd118a7b62676b3164f530e3f 100644 (file)
--- a/framework/main/classes/helper/class_BaseHelper.php
+++ b/framework/main/classes/helper/class_BaseHelper.php
@@ -91,7 +91,11 @@ abstract class BaseHelper extends BaseFrameworkSystem {
         */
        protected function __construct (string $className) {
                // Call parent constructor
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('BASE-HELPER: className=%s - CONSTRUCTED!', $className));
                parent::__construct($className);
+
+               // Trace message
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('BASE-HELPER: EXIT!');
        }
 
        /**
@@ -99,9 +103,21 @@ abstract class BaseHelper extends BaseFrameworkSystem {
         *
         * @param       $newContent             New content to add
         * @return      void
+        * @throws      InvalidArgumentException        If a parameter has an invalid value
         */
        protected final function addContent (string $newContent) {
+               // Check variable
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('BASE-HELPER: newContent=%s - CALLED!', $newContent));
+               if (empty(trim($newContent))) {
+                       // Throw IAE
+                       throw new InvalidArgumentException('Parameter "newContent" is empty', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
+               }
+
+               // Append content with EOL
                $this->content .= trim($newContent) . PHP_EOL;
+
+               // Trace message
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('BASE-HELPER: this->content()=%d - EXIT!', strlen($this->content)));
        }
 
        /**
@@ -109,10 +125,21 @@ abstract class BaseHelper extends BaseFrameworkSystem {
         *
         * @param       $content        Content to to the base
         * @return      void
+        * @throws      InvalidArgumentException        If a parameter has an invalid value
         */
        protected function addHeaderContent (string $content) {
+               // Check variable
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('BASE-HELPER: content=%s - CALLED!', $content));
+               if (empty(trim($content))) {
+                       // Throw IAE
+                       throw new InvalidArgumentException('Parameter "content" is empty', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
+               }
+
                // Add the header content
                $this->groups['header']['content'] = trim($content);
+
+               // Trace message
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('BASE-HELPER: EXIT!');
        }
 
        /**
@@ -120,10 +147,21 @@ abstract class BaseHelper extends BaseFrameworkSystem {
         *
         * @param       $content        Content to to the base
         * @return      void
+        * @throws      InvalidArgumentException        If a parameter has an invalid value
         */
        protected function addFooterContent (string $content) {
+               // Check variable
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage(sprintf('BASE-HELPER: content=%s - CALLED!', $content));
+               if (empty(trim($content))) {
+                       // Throw IAE
+                       throw new InvalidArgumentException('Parameter "content" is empty', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
+               }
+
                // Add the footer content
                $this->groups['footer']['content'] = trim($content);
+
+               // Trace message
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->traceMessage('BASE-HELPER: EXIT!');
        }
 
        /**