From d355aab69acaed998aa7c68ea7d582e38da9addb Mon Sep 17 00:00:00 2001
From: =?utf8?q?Roland=20H=C3=A4der?= <roland@mxchange.org>
Date: Fri, 17 Feb 2023 19:44:10 +0100
Subject: [PATCH] Continued: - renamed getPrimaryKeyValue() to
 generatePrimaryKey() - added more debug lines - added more checks for
 parameter

---
 framework/loader/class_ClassLoader.php        |  2 +-
 .../frontend/class_BaseDatabaseFrontend.php   | 80 ++++++++++++++-----
 .../binary/index/class_IndexFile.php          | 14 ++--
 .../binary/stack/class_StackFile.php          | 18 ++---
 .../file_directories/class_BaseFileIo.php     |  2 +-
 .../class_FrameworkFileInputOutputPointer.php |  4 +-
 .../index/file/class_BaseFileIndex.php        | 18 ++---
 .../index/file/stack/class_FileStackIndex.php |  4 +-
 .../classes/stacker/class_BaseStacker.php     |  2 +-
 .../stacker/fifo/class_FiFoStacker.php        | 11 ++-
 .../stacker/file/class_BaseFileStack.php      | 20 ++---
 .../stacker/file/fifo/class_FiFoFileStack.php |  4 +-
 .../stacker/filo/class_FiLoStacker.php        |  2 +-
 .../main/classes/user/class_BaseUser.php      |  2 +-
 .../frontend/class_DatabaseFrontend.php       |  4 +-
 .../database/class_DatabaseConnection.php     |  2 +-
 16 files changed, 115 insertions(+), 74 deletions(-)

diff --git a/framework/loader/class_ClassLoader.php b/framework/loader/class_ClassLoader.php
index 07dfd842..a9de4ee0 100644
--- a/framework/loader/class_ClassLoader.php
+++ b/framework/loader/class_ClassLoader.php
@@ -399,7 +399,7 @@ final class ClassLoader {
 		}
 
 		// Try to include this class
-		//* NOISY-DEBUG: */ printf('[%s:%d]: Calling self->loadClassFile(%s) ...' . PHP_EOL, __METHOD__, __LINE__, $className);
+		//* NOISY-DEBUG: */ printf('[%s:%d]: Invoking self->loadClassFile(%s) ...' . PHP_EOL, __METHOD__, __LINE__, $className);
 		self::getSelfInstance()->loadClassFile($className);
 
 		// Trace message
diff --git a/framework/main/classes/database/frontend/class_BaseDatabaseFrontend.php b/framework/main/classes/database/frontend/class_BaseDatabaseFrontend.php
index 2f4320cc..23de87b3 100644
--- a/framework/main/classes/database/frontend/class_BaseDatabaseFrontend.php
+++ b/framework/main/classes/database/frontend/class_BaseDatabaseFrontend.php
@@ -12,6 +12,9 @@ use Org\Mxchange\CoreFramework\Object\BaseFrameworkSystem;
 use Org\Mxchange\CoreFramework\Result\Database\BaseDatabaseResult;
 use Org\Mxchange\CoreFramework\Traits\Cache\CacheableTrait;
 
+// Import SPL stuff
+use \InvalidArgumentException;
+
 /**
  * A generic database frontend
  *
@@ -55,10 +58,14 @@ abstract class BaseDatabaseFrontend extends BaseFrameworkSystem {
 	 */
 	protected function __construct (string $className) {
 		// Call parent constructor
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-DATABASE-FRONTEND: CONSTRUCTED!');
 		parent::__construct($className);
 
 		// Initialize the cache instance
 		$this->initCacheInstance();
+
+		// Trace message
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-DATABASE-FRONTEND: EXIT!');
 	}
 
 	/**
@@ -68,13 +75,18 @@ abstract class BaseDatabaseFrontend extends BaseFrameworkSystem {
 	 */
 	private final function initCacheInstance () {
 		// Set "cache" attributes
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-DATABASE-FRONTEND: CALLED!');
 		$this->databaseCacheEnabled = FrameworkBootstrap::getConfigurationInstance()->getConfigEntry('database_cache_enabled');
 
 		// Is the cache enabled?
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: this->databaseCacheEnabled=%d', intval($this->databaseCacheEnabled)));
 		if ($this->databaseCacheEnabled === true) {
 			// Set the new instance
 			$this->setCacheInstance(ObjectFactory::createObjectByConfiguredName('cache_class'));
 		}
+
+		// Trace message
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-DATABASE-FRONTEND: EXIT!');
 	}
 
 	/**
@@ -105,7 +117,7 @@ abstract class BaseDatabaseFrontend extends BaseFrameworkSystem {
 	 */
 	protected function getCacheKeyByCriteria (Criteria $criteriaInstance, array $onlyKeys = []) {
 		// Generate it
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FRAMEWORK-SYSTEM: criteriaInstance=' . $criteriaInstance->__toString() . ',onlyKeys()=' . count($onlyKeys) . ' - CALLED!');
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: criteriaInstance=%s,onlyKeys()=%d - CALLED!', $criteriaInstance->__toString(), count($onlyKeys)));
 		$cacheKey = sprintf('%s@%s',
 			$this->__toString(),
 			$criteriaInstance->getCacheKey($onlyKeys)
@@ -125,21 +137,22 @@ abstract class BaseDatabaseFrontend extends BaseFrameworkSystem {
 	 */
 	protected function queryInsertDataSet (StoreableCriteria $dataSetInstance, array $onlyKeys = []) {
 		// Default cache key is NULL
-		//* DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FRONTEND: dataSetInstance=%s,onlyKeys()=%d - CALLED!', $dataSetInstance->__toString(), count($onlyKeys)));
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: dataSetInstance=%s,onlyKeys()=%d - CALLED!', $dataSetInstance->__toString(), count($onlyKeys)));
 		$cacheKey = NULL;
 
 		// Is cache enabled?
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: this->databaseCacheEnabled=%d', intval($this->databaseCacheEnabled)));
 		if ($this->databaseCacheEnabled === true) {
 			// First get a key suitable for our cache and extend it with this class name
 			$cacheKey = $this->getCacheKeyByCriteria($dataSetInstance, $onlyKeys);
-			//* DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FRONTEND: Using cache key ' . $cacheKey . ' for purging ...');
+			//* DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: Using cache key %s for purging ...', $cacheKey));
 		}
 
 		// Does this key exists in cache?
-		//* DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FRONTEND: cacheKey[%s]=%s', gettype($cacheKey), $cacheKey));
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: this->databaseCacheEnabled=%d,cacheKey[%s]=%s', intval($this->databaseCacheEnabled), gettype($cacheKey), $cacheKey));
 		if (($this->databaseCacheEnabled === true) && ($this->getCacheInstance()->offsetExists($cacheKey))) {
 			// Purge the cache
-			//* DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FRONTEND: Calling this->cacheInstance->purgeOffset(%s) ...', $cacheKey));
+			//* DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: Invoking this->cacheInstance->purgeOffset(%s) ...', $cacheKey));
 			$this->getCacheInstance()->purgeOffset($cacheKey);
 		}
 
@@ -147,7 +160,7 @@ abstract class BaseDatabaseFrontend extends BaseFrameworkSystem {
 		FrameworkBootstrap::getDatabaseInstance()->queryInsertDataSet($dataSetInstance);
 
 		// Trace message
-		//* DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FRONTEND: EXIT!');
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-DATABASE-FRONTEND: EXIT!');
 	}
 
 	/**
@@ -159,16 +172,19 @@ abstract class BaseDatabaseFrontend extends BaseFrameworkSystem {
 	 */
 	protected function queryUpdateDataSet (StoreableCriteria $dataSetInstance, array $onlyKeys = []) {
 		// Init cache key
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: dataSetInstance=%s,onlyKeys()=%d - CALLED!', $dataSetInstance->__toString(), count($onlyKeys)));
 		$cacheKey = NULL;
 
 		// Is cache enabled?
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: this->databaseCacheEnabled=%d', intval($this->databaseCacheEnabled)));
 		if ($this->databaseCacheEnabled === true) {
 			// First get a key suitable for our cache and extend it with this class name
 			$cacheKey = $this->getCacheKeyByCriteria($dataSetInstance, $onlyKeys);
-			//* DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FRONTEND: Using cache key ' . $cacheKey . ' for purging ...');
+			//* DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-DATABASE-FRONTEND: Using cache key ' . $cacheKey . ' for purging ...');
 		}
 
 		// Does this key exists in cache?
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: this->databaseCacheEnabled=%d,cacheKey=%s', intval($this->databaseCacheEnabled), $cacheKey));
 		if (($this->databaseCacheEnabled === true) && ($this->getCacheInstance()->offsetExists($cacheKey))) {
 			// Purge the cache
 			$this->getCacheInstance()->purgeOffset($cacheKey);
@@ -176,6 +192,9 @@ abstract class BaseDatabaseFrontend extends BaseFrameworkSystem {
 
 		// Handle it over to the middleware
 		FrameworkBootstrap::getDatabaseInstance()->queryUpdateDataSet($dataSetInstance);
+
+		// Trace message
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-DATABASE-FRONTEND: EXIT!');
 	}
 
 	/**
@@ -184,6 +203,7 @@ abstract class BaseDatabaseFrontend extends BaseFrameworkSystem {
 	 * @return	$indexKey	Index key
 	 */
 	public final function getIndexKey () {
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-DATABASE-FRONTEND: CALLED!');
 		return FrameworkBootstrap::getDatabaseInstance()->getIndexKey();
 	}
 
@@ -193,6 +213,7 @@ abstract class BaseDatabaseFrontend extends BaseFrameworkSystem {
 	 * @return	$lastException	Last exception or NULL if none occured
 	 */
 	public final function getLastException () {
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-DATABASE-FRONTEND: CALLED!');
 		return FrameworkBootstrap::getDatabaseInstance()->getLastException();
 	}
 
@@ -206,34 +227,36 @@ abstract class BaseDatabaseFrontend extends BaseFrameworkSystem {
 	 */
 	public function doSelectByCriteria (Criteria $criteriaInstance, array $onlyKeys = []) {
 		// Default cache key if cache is not enabled
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FRONTEND: criteriaInstance=%s,onlyKeys()=%d - CALLED!', $criteriaInstance->__toString(), count($onlyKeys)));
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: criteriaInstance=%s,onlyKeys()=%d - CALLED!', $criteriaInstance->__toString(), count($onlyKeys)));
 		$cacheKey = NULL;
 		$result = [];
 
 		// Is the cache enabled?
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: this->databaseCacheEnabled=%d', intval($this->databaseCacheEnabled)));
 		if ($this->databaseCacheEnabled === true) {
 			// First get a key suitable for our cache and extend it with this class name
 			$cacheKey = $this->getCacheKeyByCriteria($criteriaInstance, $onlyKeys);
 		}
 
 		// Does this key exists in cache?
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FRONTEND: cacheKey[%s]=%s', gettype($cacheKey), $cacheKey));
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: this->databaseCacheEnabled=%d,cacheKey[%s]=%s', intval($this->databaseCacheEnabled), gettype($cacheKey), $cacheKey));
 		if (($this->databaseCacheEnabled === true) && ($this->getCacheInstance()->offsetExists($cacheKey, BaseDatabaseResult::RESULT_NAME_ROWS, 1))) {
 			// Then use this result
-			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FRONTEND: Cache used for cacheKey=%s', $cacheKey));
+			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: Cache used for cacheKey=%s', $cacheKey));
 			$result = $this->getCacheInstance()->offsetGet($cacheKey);
 		} else {
 			// Now it's time to ask the database layer for this select statement
-			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FRONTEND: Quering database, cacheKey=%s ...', $cacheKey));
+			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: Quering database, cacheKey=%s ...', $cacheKey));
 			$result = FrameworkBootstrap::getDatabaseInstance()->doSelectByTableCriteria($this->getTableName(), $criteriaInstance);
 
 			// Cache the result if not null
-			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FRONTEND: result[]=%s', gettype($result)));
+			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: result[]=%s', gettype($result)));
 			if (!is_null($result)) {
 				// Is cache enabled?
+				//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: this->databaseCacheEnabled=%d', intval($this->databaseCacheEnabled)));
 				if ($this->databaseCacheEnabled === true) {
 					// A valid result has returned from the database layer
-					//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FRONTEND: Setting cacheKey=%s with result()=%d entries', $cacheKey, count($result)));
+					//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: Setting cacheKey=%s with result()=%d entries', $cacheKey, count($result)));
 					$this->getCacheInstance()->offsetSet($cacheKey, $result);
 				}
 			} else {
@@ -247,11 +270,11 @@ abstract class BaseDatabaseFrontend extends BaseFrameworkSystem {
 
 		// Create an instance of a CachedDatabaseResult class with the given result
 		// @TODO Minor: Update above comment to e.g. BaseDatabaseResult
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FRONTEND: result[%s]=%s,result[%s]?=%d,result[%s]?=%d', BaseDatabaseResult::RESULT_NAME_STATUS, $result[BaseDatabaseResult::RESULT_NAME_STATUS], BaseDatabaseResult::RESULT_NAME_ROWS, isset($result[BaseDatabaseResult::RESULT_NAME_ROWS]), BaseDatabaseResult::RESULT_NAME_EXCEPTION, isset($result[BaseDatabaseResult::RESULT_NAME_EXCEPTION])));
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: result[%s]=%s,result[%s]?=%d,result[%s]?=%d', BaseDatabaseResult::RESULT_NAME_STATUS, $result[BaseDatabaseResult::RESULT_NAME_STATUS], BaseDatabaseResult::RESULT_NAME_ROWS, isset($result[BaseDatabaseResult::RESULT_NAME_ROWS]), BaseDatabaseResult::RESULT_NAME_EXCEPTION, isset($result[BaseDatabaseResult::RESULT_NAME_EXCEPTION])));
 		$resultInstance = ObjectFactory::createObjectByConfiguredName('database_result_class', array($result));
 
 		// And return the instance
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FRONTEND: resultInstance=%s - EXIT!', $resultInstance->__toString()));
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: resultInstance=%s - EXIT!', $resultInstance->__toString()));
 		return $resultInstance;
 	}
 
@@ -264,34 +287,36 @@ abstract class BaseDatabaseFrontend extends BaseFrameworkSystem {
 	 */
 	public function doSelectCountByCriteria (Criteria $criteriaInstance, array $onlyKeys = []) {
 		// Total numbers is -1 so we can distinglish between failed and valid queries
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: criteriaInstance=%s,onlyKeys()=%d - CALLED!', $criteriaInstance->__toString(), count($onlyKeys)));
 		$numRows = 0;
 
 		// Get the result from above method
 		$resultInstance = $this->doSelectByCriteria($criteriaInstance, $onlyKeys);
 
 		// Was that query fine?
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: resultInstance->ifStatusIsOkay()=%d', $resultInstance->ifStatusIsOkay()));
 		if ($resultInstance->ifStatusIsOkay()) {
 			// Then get the number of rows
 			$numRows = $resultInstance->getAffectedRows();
-
-			// Debug message
-			//* DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FRONTEND: numRows=' . $numRows);
 		}
 
 		// Return the result
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: numRows=%d - EXIT!', $numRows));
 		return $numRows;
 	}
 
 	/**
-	 * Getter for primary key used in wrapped table
+	 * Generates a primary key for this database frontend
 	 *
 	 * @return	$primaryKey		Primary key used in wrapped table
 	 */
-	public final function getPrimaryKeyValue () {
+	public final function generatePrimaryKey () {
 		// Get the table name and a database instance and ask for it
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-DATABASE-FRONTEND: CALLED!');
 		$primaryKey = FrameworkBootstrap::getDatabaseInstance()->getPrimaryKeyOfTable($this->getTableName());
 
 		// Return value
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: primaryKey=%s - EXIT!', $primaryKey));
 		return $primaryKey;
 	}
 
@@ -302,9 +327,11 @@ abstract class BaseDatabaseFrontend extends BaseFrameworkSystem {
 	 */
 	public final function countTotalRows () {
 		// Get the table name and a database instance and ask for it
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-DATABASE-FRONTEND: CALLED!');
 		$count = FrameworkBootstrap::getDatabaseInstance()->countTotalRows($this->getTableName());
 
 		// Return value
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: count=%d - EXIT!', $count));
 		return $count;
 	}
 
@@ -313,12 +340,21 @@ abstract class BaseDatabaseFrontend extends BaseFrameworkSystem {
 	 *
 	 * @param	$data	An array with possible non-public data that needs to be removed.
 	 * @return	$data	A cleaned up array with only public data.
+	 * @throws	InvalidArgumentException	If a parameter has an invalid value
 	 */
 	public function removeNonPublicDataFromArray (array $data) {
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('WRAPPER[' . $this->__toString() . ']: Calling FrameworkBootstrap::getDatabaseInstance()->removeNonPublicDataFromArray(data) ...');
+		// Check parameter
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: data()=%d - CALLED!', count($data)));
+		if (count($data) == 0) {
+			// Throw IAE
+			throw new InvalidArgumentException('Parameter "data" is an empty array', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
+		}
+
+		// Remove non-public data (aka. sensitive)
 		$data = FrameworkBootstrap::getDatabaseInstance()->removeNonPublicDataFromArray($data);
 
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('WRAPPER[' . $this->__toString() . ']: data[]=' . gettype($data));
+		// Return cleaned array
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-DATABASE-FRONTEND: data()=%d - EXIT!', count($data)));
 		return $data;
 	}
 
diff --git a/framework/main/classes/file_directories/binary/index/class_IndexFile.php b/framework/main/classes/file_directories/binary/index/class_IndexFile.php
index 78dac38e..99a56a6c 100644
--- a/framework/main/classes/file_directories/binary/index/class_IndexFile.php
+++ b/framework/main/classes/file_directories/binary/index/class_IndexFile.php
@@ -93,7 +93,7 @@ class IndexFile extends BaseBinaryFile implements IndexableFile {
 		}
 
 		// Call block instance
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('INDEX-FILE: Calling this->indexInstance->flushFileHeader() ...');
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('INDEX-FILE: Invoking this->indexInstance->flushFileHeader() ...');
 		$this->getIndexInstance()->flushFileHeader();
 
 		// Trace message
@@ -126,6 +126,7 @@ class IndexFile extends BaseBinaryFile implements IndexableFile {
 		$minimumBlockLength = $this->getIndexInstance()->calculateMinimumBlockLength();
 
 		// Call protected method
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: Invoking this->preAllocateFileByTypeLength(%s,%d) ...', $type, $minimumBlockLength));
 		$this->preAllocateFileByTypeLength($type, $minimumBlockLength);
 
 		// Trace message
@@ -149,11 +150,11 @@ class IndexFile extends BaseBinaryFile implements IndexableFile {
 		}
 
 		// Get length from index
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('INDEX-FILE: Calling this->indexInstance->calculateMinimumBlockLength() ...');
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('INDEX-FILE: Invoking this->indexInstance->calculateMinimumBlockLength() ...');
 		$length = $this->getIndexInstance()->calculateMinimumBlockLength();
 
 		// Call protected method
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: Calling this->isValidByLength(%d) ...', $length));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: Invoking this->isValidByLength(%d) ...', $length));
 		$isValid = $this->isValidByLength($length);
 
 		// Return result
@@ -174,7 +175,7 @@ class IndexFile extends BaseBinaryFile implements IndexableFile {
 		$length = $this->getIndexInstance()->calculateMinimumBlockLength();
 
 		// Call protected method
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: Calling parent::readNextBlockByLength(%d) ...', $length));
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: Invoking parent::readNextBlockByLength(%d) ...', $length));
 		parent::readNextBlockByLength($length);
 
 		// Trace message
@@ -188,7 +189,7 @@ class IndexFile extends BaseBinaryFile implements IndexableFile {
 	 */
 	public function readFileHeader () {
 		// Call index class' method
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('INDEX-FILE: Calling this->indexInstance->readIndexHeader() - CALLED!');
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('INDEX-FILE: Invoking this->indexInstance->readIndexHeader() - CALLED!');
 		$this->getIndexInstance()->readIndexHeader();
 
 		// Trace message
@@ -219,10 +220,11 @@ class IndexFile extends BaseBinaryFile implements IndexableFile {
 		}
 
 		// Encode/convert the value into a "binary format"
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: Invoking StringUtils::encodeData(value[]=%s) ...', gettype($value)));
 		$encoded = StringUtils::encodeData($value);
 
 		// Get a strong hash for the "encoded" data
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: encoded=%s', $encoded));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: encoded(%d)=%s', strlen($encoded), $encoded));
 		$hash = CryptoUtils::hash($encoded);
 
 		// Then write it to the next free gap
diff --git a/framework/main/classes/file_directories/binary/stack/class_StackFile.php b/framework/main/classes/file_directories/binary/stack/class_StackFile.php
index f93dd769..5d3f4c94 100644
--- a/framework/main/classes/file_directories/binary/stack/class_StackFile.php
+++ b/framework/main/classes/file_directories/binary/stack/class_StackFile.php
@@ -91,7 +91,7 @@ class StackFile extends BaseBinaryFile implements FileStacker {
 		}
 
 		// Call block instance
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('STACK-FILE: Calling this->indexInstance->flushFileHeader() ...');
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('STACK-FILE: Invoking this->indexInstance->flushFileHeader() ...');
 		$this->getStackInstance()->flushFileHeader();
 
 		// Trace message
@@ -147,11 +147,11 @@ class StackFile extends BaseBinaryFile implements FileStacker {
 		}
 
 		// Get length from index
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('STACK-FILE: Calling this->stackInstance->calculateMinimumBlockLength() ...');
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('STACK-FILE: Invoking this->stackInstance->calculateMinimumBlockLength() ...');
 		$length = $this->getStackInstance()->calculateMinimumBlockLength();
 
 		// Call protected method
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('STACK-FILE: Calling this->isValidByLength(%d) ...', $length));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('STACK-FILE: Invoking this->isValidByLength(%d) ...', $length));
 		$isValid = $this->isValidByLength($length);
 
 		// Return result
@@ -167,7 +167,7 @@ class StackFile extends BaseBinaryFile implements FileStacker {
 	 */
 	public function readFileHeader () {
 		// Call stacke instance
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('STACK-FILE: Calling this->stackInstance->readStackHeader() - CALLED!');
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('STACK-FILE: Invoking this->stackInstance->readStackHeader() - CALLED!');
 		$this->getStackInstance()->readStackHeader();
 
 		// Trace message
@@ -187,7 +187,7 @@ class StackFile extends BaseBinaryFile implements FileStacker {
 		$length = $this->getStackInstance()->calculateMinimumBlockLength();
 
 		// Call protected method
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('STACK-FILE: Calling parent::readNextBlockByLength(%d) ...', $length));
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('STACK-FILE: Invoking parent::readNextBlockByLength(%d) ...', $length));
 		parent::readNextBlockByLength($length);
 
 		// Trace message
@@ -208,21 +208,21 @@ class StackFile extends BaseBinaryFile implements FileStacker {
 		if (empty($stackName)) {
 			// Throw IAE
 			throw new InvalidArgumentException('Parameter "stackName" is empty', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
-		} elseif (is_object($value) || is_resource($value)) {
+		} elseif (is_array($value) || is_object($value) || is_resource($value)) {
 			// Not wanted here
 			throw new InvalidArgumentException(sprintf('value[]=%s is not stackable in files', gettype($value)));
 		}
 
 		// Encode/convert the value into a "binary format"
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('STACK-FILE: Calling StringUtils::encodeData(value[]=%s) ...', gettype($value)));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('STACK-FILE: Invoking StringUtils::encodeData(value[]=%s) ...', gettype($value)));
 		$encoded = StringUtils::encodeData($value);
 
 		// Get a strong hash for the "encoded" data
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('STACK-FILE: Calling CryptoUtils::hash(%s) ...', $encoded));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('STACK-FILE: Invoking CryptoUtils::hash(%s) ...', $encoded));
 		$hash = CryptoUtils::hash($encoded);
 
 		// Then write it to the next free gap
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('STACK-FILE: Calling this->stackInstance->writeDataToFreeGap(%s,%s,%s) ...', $stackName, $hash, $encoded));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('STACK-FILE: Invoking this->stackInstance->writeDataToFreeGap(%s,%s,%s) ...', $stackName, $hash, $encoded));
 		$data = $this->getStackInstance()->writeDataToFreeGap($stackName, $hash, $encoded);
 
 		// Return info
diff --git a/framework/main/classes/file_directories/class_BaseFileIo.php b/framework/main/classes/file_directories/class_BaseFileIo.php
index 05098d0b..3dfab5b6 100644
--- a/framework/main/classes/file_directories/class_BaseFileIo.php
+++ b/framework/main/classes/file_directories/class_BaseFileIo.php
@@ -61,7 +61,7 @@ abstract class BaseFileIo extends BaseFrameworkSystem implements FilePointer, Cl
 		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-IO: this->fileObject[]=%s - DESTRUCTOR!', gettype($this->getFileObject())));
 		if (is_object($this->getFileObject())) {
 			// Try to close a file
-			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-IO: Calling this->closeFile() ...');
+			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-IO: Invoking this->closeFile() ...');
 			$this->closeFile();
 		}
 
diff --git a/framework/main/classes/file_directories/io/class_FrameworkFileInputOutputPointer.php b/framework/main/classes/file_directories/io/class_FrameworkFileInputOutputPointer.php
index 54a18ac7..b0086c98 100644
--- a/framework/main/classes/file_directories/io/class_FrameworkFileInputOutputPointer.php
+++ b/framework/main/classes/file_directories/io/class_FrameworkFileInputOutputPointer.php
@@ -136,7 +136,7 @@ class FrameworkFileInputOutputPointer extends BaseFileIo implements InputOutputP
 		$length = strlen($dataStream);
 
 		// Write data to the file pointer and return written bytes
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-INPUT-OUTPUT-POINTER: Calling this->fileObject->fwrite(%s,%d) ...', $dataStream, $length));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-INPUT-OUTPUT-POINTER: Invoking this->fileObject->fwrite(%s,%d) ...', $dataStream, $length));
 		$status = $this->getFileObject()->fwrite($dataStream, $length);
 
 		// Return status
@@ -168,7 +168,7 @@ class FrameworkFileInputOutputPointer extends BaseFileIo implements InputOutputP
 		}
 
 		// Then write the data at that position
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-INPUT-OUTPUT-POINTER: Calling this->writeToFile(%s) ...', $dataStream));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-INPUT-OUTPUT-POINTER: Invoking this->writeToFile(%s) ...', $dataStream));
 		$status = $this->writeToFile($dataStream);
 
 		// Return status
diff --git a/framework/main/classes/index/file/class_BaseFileIndex.php b/framework/main/classes/index/file/class_BaseFileIndex.php
index b0a24772..21166c12 100644
--- a/framework/main/classes/index/file/class_BaseFileIndex.php
+++ b/framework/main/classes/index/file/class_BaseFileIndex.php
@@ -100,7 +100,7 @@ abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
 		$data = substr($data, 0, -1);
 
 		// And update seek position
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Calling this->iteratorInstance->binaryFileInstance->updateSeekPosition() ...');
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Invoking this->iteratorInstance->binaryFileInstance->updateSeekPosition() ...');
 		$this->getIteratorInstance()->getBinaryFileInstance()->updateSeekPosition();
 
 		/*
@@ -112,7 +112,7 @@ abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
 		$header = explode(chr(BinaryFile::SEPARATOR_HEADER_DATA), $data);
 
 		// Map numeric entries to associative (alpha-numeric) elements
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: Calling ArrayUtils::mapNumericKeysToAssociative(%d) ...', count($header)));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: Invoking ArrayUtils::mapNumericKeysToAssociative(%d) ...', count($header)));
 		//* PRINTR-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: header(%d)=%s', count($header), print_r($header, true)));
 		$header = ArrayUtils::mapNumericKeysToAssociative($header, [
 			BinaryFile::HEADER_NAME_MAGIC,
@@ -165,7 +165,7 @@ abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
 		);
 
 		// Write it to disk (header is always at seek position 0)
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: Calling this->iteratorInstance->binaryFileInstance->writeAtPosition(0, header=%s) ...', $header));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: Invoking this->iteratorInstance->binaryFileInstance->writeAtPosition(0, header=%s) ...', $header));
 		$this->getIteratorInstance()->getBinaryFileInstance()->writeAtPosition(0, $header);
 
 		// Trace message
@@ -203,7 +203,7 @@ abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
 		$this->getIteratorInstance()->getBinaryFileInstance()->setHeaderSize($headerSize);
 
 		// Init counters and gaps array
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Calling this->iteratorInstance->binaryFileInstance->initCountersGapsArray() ...');
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Invoking this->iteratorInstance->binaryFileInstance->initCountersGapsArray() ...');
 		$this->getIteratorInstance()->getBinaryFileInstance()->initCountersGapsArray();
 
 		// Default is not created
@@ -212,11 +212,11 @@ abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
 		// Is the file's header initialized?
 		if (!$this->getIteratorInstance()->getBinaryFileInstance()->isFileHeaderInitialized()) {
 			// First pre-allocate a bit
-			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Calling this->iteratorInstance->binaryFileInstance->preAllocateFile(index) ...');
+			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Invoking this->iteratorInstance->binaryFileInstance->preAllocateFile(index) ...');
 			$this->getIteratorInstance()->getBinaryFileInstance()->preAllocateFile('index');
 
 			// Then write file header
-			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Calling this->iteratorInstance->binaryFileInstance->createFileHeader() ...');
+			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Invoking this->iteratorInstance->binaryFileInstance->createFileHeader() ...');
 			$this->getIteratorInstance()->getBinaryFileInstance()->createFileHeader();
 
 			// Mark as freshly created
@@ -224,14 +224,14 @@ abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
 		}
 
 		// Load the file header
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Calling this->readIndexHeader() ...');
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Invoking this->readIndexHeader() ...');
 		$this->readIndexHeader();
 
 		// Freshly created?
 		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: created=%d', intval($created)));
 		if (!$created) {
 			// Analyze file structure
-			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Calling this->iteratorInstance->binaryFileInstance->analyzeFileStructure() ...');
+			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Invoking this->iteratorInstance->binaryFileInstance->analyzeFileStructure() ...');
 			$this->getIteratorInstance()->getBinaryFileInstance()->analyzeFileStructure();
 		}
 
@@ -320,7 +320,7 @@ abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
 		}
 
 		// Call iterated object's method
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: Calling this->iteratorInstance->binaryFileInstance->writeAtPosition(%d, %s) ...', $seekPosition, $dataStream));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: Invoking this->iteratorInstance->binaryFileInstance->writeAtPosition(%d, %s) ...', $seekPosition, $dataStream));
 		$status = $this->getIteratorInstance()->getBinaryFileInstance()->writeAtPosition($seekPosition, $dataStream);
 
 		// Return status
diff --git a/framework/main/classes/index/file/stack/class_FileStackIndex.php b/framework/main/classes/index/file/stack/class_FileStackIndex.php
index 6cf2742f..621508d0 100644
--- a/framework/main/classes/index/file/stack/class_FileStackIndex.php
+++ b/framework/main/classes/index/file/stack/class_FileStackIndex.php
@@ -109,7 +109,7 @@ class FileStackIndex extends BaseFileIndex implements IndexableStack, Registerab
 		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-STACK-INDEX: stackName=%s,hash{}=0x%s,rawData(%d)=%s', $stackName, bin2hex($data[StackableFile::ARRAY_NAME_HASH]), strlen($rawData), $rawData));
 
 		// Search for next free gap
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-STACK-INDEX: Calling this->iteratorInstance->binaryFileInstance->searchNextGap(%d) ...', strlen($rawData)));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-STACK-INDEX: Invoking this->iteratorInstance->binaryFileInstance->searchNextGap(%d) ...', strlen($rawData)));
 		$gapPosition = $this->getIteratorInstance()->getBinaryFileInstance()->searchNextGap(strlen($rawData));
 
 		// Gap position cannot be smaller or equal than header length
@@ -120,7 +120,7 @@ class FileStackIndex extends BaseFileIndex implements IndexableStack, Registerab
 		}
 
 		// Then write the data at that gap
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-STACK-INDEX: Calling this->iteratorInstance->binaryFileInstance->writeData(%d,%s) ...', $gapPosition, $rawData));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-STACK-INDEX: Invoking this->iteratorInstance->binaryFileInstance->writeData(%d,%s) ...', $gapPosition, $rawData));
 		$this->getIteratorInstance()->getBinaryFileInstance()->writeData($gapPosition, $rawData);
 
 		// Trace message
diff --git a/framework/main/classes/stacker/class_BaseStacker.php b/framework/main/classes/stacker/class_BaseStacker.php
index 6526f0a4..3480ddb7 100644
--- a/framework/main/classes/stacker/class_BaseStacker.php
+++ b/framework/main/classes/stacker/class_BaseStacker.php
@@ -102,7 +102,7 @@ abstract class BaseStacker extends BaseFrameworkSystem {
 		// "Walk" through all (more will be added as needed
 		foreach ($stacks as $stackerName) {
 			// Init this stack
-			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-STACKER: Calling this->initStack(%s,%d) ...', $stackerName, intval($forceReInit)));
+			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-STACKER: Invoking this->initStack(%s,%d) ...', $stackerName, intval($forceReInit)));
 			$this->initStack($stackerName, $forceReInit);
 		}
 
diff --git a/framework/main/classes/stacker/fifo/class_FiFoStacker.php b/framework/main/classes/stacker/fifo/class_FiFoStacker.php
index 32574ee7..cf590a76 100644
--- a/framework/main/classes/stacker/fifo/class_FiFoStacker.php
+++ b/framework/main/classes/stacker/fifo/class_FiFoStacker.php
@@ -72,10 +72,13 @@ class FiFoStacker extends BaseStacker implements Stackable {
 		if (empty($stackerName)) {
 			// No empty stack name
 			throw new InvalidArgumentException('Parameter "stackerName" is empty', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
+		} elseif (is_resource($value) || is_array($value) || is_object($value)) {
+			// Unsupported variable type
+			throw new InvalidArgumentException(sprintf('value[]=%s is not supported', gettype($value)), FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
 		}
 
 		// Call the protected method
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-STACKER: Calling parent::addValueToStack(%s,%s) ...', $stackerName, gettype($value)));
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-STACKER: Invoking parent::addValueToStack(%s,%s) ...', $stackerName, gettype($value)));
 		parent::addValueToStack($stackerName, $value);
 
 		// Trace message
@@ -100,11 +103,11 @@ class FiFoStacker extends BaseStacker implements Stackable {
 		}
 
 		// Get the value
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-STACKER: Calling this->getNamed(%s) ...', $stackerName));
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-STACKER: Invoking this->getNamed(%s) ...', $stackerName));
 		$value = $this->getNamed($stackerName);
 
 		// Call the protected method
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-STACKER: Calling parent::popFirst(%s) ...', $stackerName));
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-STACKER: Invoking parent::popFirst(%s) ...', $stackerName));
 		parent::popFirst($stackerName);
 
 		// Return the value
@@ -130,7 +133,7 @@ class FiFoStacker extends BaseStacker implements Stackable {
 		}
 
 		// Call the protected method
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-STACKER: Calling parent::getFirstValue(%s) ...', $stackerName));
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-STACKER: Invoking parent::getFirstValue(%s) ...', $stackerName));
 		$value = parent::getFirstValue($stackerName);
 
 		// Return value
diff --git a/framework/main/classes/stacker/file/class_BaseFileStack.php b/framework/main/classes/stacker/file/class_BaseFileStack.php
index e5f1ce72..4eb59431 100644
--- a/framework/main/classes/stacker/file/class_BaseFileStack.php
+++ b/framework/main/classes/stacker/file/class_BaseFileStack.php
@@ -115,7 +115,7 @@ abstract class BaseFileStack extends BaseStacker {
 		$data = substr($data, 0, -1);
 
 		// And update seek position
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Calling this->iteratorInstance->binaryFileInstance->updateSeekPosition() ...');
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Invoking this->iteratorInstance->binaryFileInstance->updateSeekPosition() ...');
 		$this->getIteratorInstance()->getBinaryFileInstance()->updateSeekPosition();
 
 		/*
@@ -128,7 +128,7 @@ abstract class BaseFileStack extends BaseStacker {
 		$header = explode(chr(BinaryFile::SEPARATOR_HEADER_DATA), $data);
 
 		// Map numeric indexes to associative indexes
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: Calling ArrayUtils::mapNumericKeysToAssociative(%d) ...', count($header)));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: Invoking ArrayUtils::mapNumericKeysToAssociative(%d) ...', count($header)));
 		$header = ArrayUtils::mapNumericKeysToAssociative($header, [
 			BinaryFile::HEADER_NAME_MAGIC,
 			BinaryFile::HEADER_NAME_TOTAL_ENTRIES,
@@ -206,7 +206,7 @@ abstract class BaseFileStack extends BaseStacker {
 		);
 
 		// Write it to disk (header is always at seek position 0)
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: Calling this->iteratorInstance->writeAtPosition(0, header=%s) ...', $header));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: Invoking this->iteratorInstance->writeAtPosition(0, header=%s) ...', $header));
 		$this->getIteratorInstance()->getBinaryFileInstance()->writeAtPosition(0, $header);
 
 		// Trace message
@@ -254,7 +254,7 @@ abstract class BaseFileStack extends BaseStacker {
 		$this->getIteratorInstance()->getBinaryFileInstance()->setHeaderSize($headerSize);
 
 		// Init counters and gaps array
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Calling this->iteratorInstance->initCountersGapsArray() ...');
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Invoking this->iteratorInstance->initCountersGapsArray() ...');
 		$this->getIteratorInstance()->getBinaryFileInstance()->initCountersGapsArray();
 
 		/*
@@ -271,7 +271,7 @@ abstract class BaseFileStack extends BaseStacker {
 		// Is the file's header initialized?
 		if (!$this->getIteratorInstance()->getBinaryFileInstance()->isFileHeaderInitialized()) {
 			// First pre-allocate a bit
-			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Calling this->iteratorInstance->preAllocateFile(file_stack) ...');
+			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Invoking this->iteratorInstance->preAllocateFile(file_stack) ...');
 			$this->getIteratorInstance()->getBinaryFileInstance()->preAllocateFile('file_stack');
 
 			// Then create file header
@@ -280,22 +280,22 @@ abstract class BaseFileStack extends BaseStacker {
 		}
 
 		// Load the file header
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Calling this->readStackHeader() ...');
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Invoking this->readStackHeader() ...');
 		$this->readStackHeader();
 
 		// Is the index loaded correctly, e.g. the stack file is just created?
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Calling this->indexInstance->isIndexLoaded() ...');
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Invoking this->indexInstance->isIndexLoaded() ...');
 		if (!$this->getIndexInstance()->isIndexLoaded()) {
 			/*
 			 * Something horrible has happened to the index as it should be
 			 * loaded at this point. The stack's file structure then needs to
 			 * be analyzed and the index rebuild.
 			 */
-			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Calling this->iteratorInstance->analyzeFileStructure() ...');
+			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Invoking this->iteratorInstance->analyzeFileStructure() ...');
 			$this->getIteratorInstance()->getBinaryFileInstance()->analyzeFileStructure();
 
 			// Rebuild index from file
-			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: Calling this->iteratorInstance->rebuildIndexFromStack(%s) ...', $this->__toString()));
+			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: Invoking this->iteratorInstance->rebuildIndexFromStack(%s) ...', $this->__toString()));
 			$this->getIndexInstance()->rebuildIndexFromStack($this);
 		}
 
@@ -336,7 +336,7 @@ abstract class BaseFileStack extends BaseStacker {
 
 		// Add the hash and gap position to the index
 		//* PRINTR-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: data=%s', print_r($data, true));
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: Calling this->indexInstance->addHashedDataToIndex(%s,data()=%d) ...', $stackerName, count($data)));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: Invoking this->indexInstance->addHashedDataToIndex(%s,data()=%d) ...', $stackerName, count($data)));
 		$this->getIndexInstance()->addHashedDataToIndex($stackerName, $data);
 
 		// Trace message
diff --git a/framework/main/classes/stacker/file/fifo/class_FiFoFileStack.php b/framework/main/classes/stacker/file/fifo/class_FiFoFileStack.php
index 15723e28..30344ab8 100644
--- a/framework/main/classes/stacker/file/fifo/class_FiFoFileStack.php
+++ b/framework/main/classes/stacker/file/fifo/class_FiFoFileStack.php
@@ -67,7 +67,7 @@ class FiFoFileStack extends BaseFileStack implements StackableFile, Calculatable
 		$stackInstance = new FiFoFileStack();
 
 		// Init this stack
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FIFO-FILE-STACK: Calling stackInstance->initFileStack([%s]=%s,%s) ...', get_class($fileInfoInstance), $fileInfoInstance, $type));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FIFO-FILE-STACK: Invoking stackInstance->initFileStack([%s]=%s,%s) ...', get_class($fileInfoInstance), $fileInfoInstance, $type));
 		$stackInstance->initFileStack($fileInfoInstance, $type);
 
 		// Return the prepared instance
@@ -96,7 +96,7 @@ class FiFoFileStack extends BaseFileStack implements StackableFile, Calculatable
 		}
 
 		// Call the protected method
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FIFO-FILE-STACK: Calling parent::addValueToStack(%s,%s) ...', $stackerName, gettype($value)));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FIFO-FILE-STACK: Invoking parent::addValueToStack(%s,%s) ...', $stackerName, gettype($value)));
 		parent::addValueToStack($stackerName, $value);
 
 		// Trace message
diff --git a/framework/main/classes/stacker/filo/class_FiLoStacker.php b/framework/main/classes/stacker/filo/class_FiLoStacker.php
index d27c1c20..79db9944 100644
--- a/framework/main/classes/stacker/filo/class_FiLoStacker.php
+++ b/framework/main/classes/stacker/filo/class_FiLoStacker.php
@@ -74,7 +74,7 @@ class FiLoStacker extends BaseStacker implements Stackable {
 		}
 
 		// Call the protected method
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILO-FILE-STACK: Calling parent::addValueToStack(%s,%s) ...', $stackerName, gettype($value)));
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILO-FILE-STACK: Invoking parent::addValueToStack(%s,%s) ...', $stackerName, gettype($value)));
 		parent::addValueToStack($stackerName, $value);
 
 		// Trace message
diff --git a/framework/main/classes/user/class_BaseUser.php b/framework/main/classes/user/class_BaseUser.php
index 023ba4b6..4b6514d3 100644
--- a/framework/main/classes/user/class_BaseUser.php
+++ b/framework/main/classes/user/class_BaseUser.php
@@ -307,7 +307,7 @@ abstract class BaseUser extends BaseFrameworkSystem implements Updateable {
 		$frontendInstance = ObjectFactory::createObjectByConfiguredName('user_db_frontend_class');
 
 		// Get the primary key back from the frontend
-		$primaryKey = $frontendInstance->getPrimaryKeyValue();
+		$primaryKey = $frontendInstance->generatePrimaryKey();
 
 		// Get that field
 		$primaryValue = $this->getField($primaryKey);
diff --git a/framework/main/interfaces/database/frontend/class_DatabaseFrontend.php b/framework/main/interfaces/database/frontend/class_DatabaseFrontend.php
index aa3a625e..3303a4d7 100644
--- a/framework/main/interfaces/database/frontend/class_DatabaseFrontend.php
+++ b/framework/main/interfaces/database/frontend/class_DatabaseFrontend.php
@@ -63,11 +63,11 @@ interface DatabaseFrontend extends FrameworkInterface {
 	function doSelectCountByCriteria (Criteria $criteriaInstance, array $onlyKeys = []);
 
 	/**
-	 * Getter for primary key used in wrapped table
+	 * Generates primary key for this database frontend
 	 *
 	 * @return	$primaryKey		Primary key used in wrapped table
 	 */
-	function getPrimaryKeyValue ();
+	function generatePrimaryKey ();
 
 	/**
 	 * Counts total rows of this table
diff --git a/framework/main/middleware/database/class_DatabaseConnection.php b/framework/main/middleware/database/class_DatabaseConnection.php
index 1f99803d..77aa81cd 100644
--- a/framework/main/middleware/database/class_DatabaseConnection.php
+++ b/framework/main/middleware/database/class_DatabaseConnection.php
@@ -240,7 +240,7 @@ class DatabaseConnection extends BaseMiddleware implements DatabaseConnector, Re
 		$this->backendInstance->connectToDatabase();
 
 		// Call database backend
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('DB-CONNECTION[' . $this->__toString() . ']: Calling this->backendInstance->removeNonPublicDataFromArray(data) ...');
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('DB-CONNECTION[' . $this->__toString() . ']: Invoking this->backendInstance->removeNonPublicDataFromArray(data) ...');
 		$data = $this->backendInstance->removeNonPublicDataFromArray($data);
 
 		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('DB-CONNECTION[' . $this->__toString() . ']: data[]=' . gettype($data));
-- 
2.39.5