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<?php |
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/** |
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* \AppserverIo\Doppelgaenger\ContractContext |
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* |
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* NOTICE OF LICENSE |
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* |
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* This source file is subject to the Open Software License (OSL 3.0) |
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* that is available through the world-wide-web at this URL: |
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* http://opensource.org/licenses/osl-3.0.php |
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* |
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* PHP version 5 |
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* |
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* @author Bernhard Wick <[email protected]> |
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* @copyright 2015 TechDivision GmbH - <[email protected]> |
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* @license http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0) |
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* @link https://github.com/appserver-io/doppelgaenger |
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* @link http://www.appserver.io/ |
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*/ |
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namespace AppserverIo\Doppelgaenger; |
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/** |
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* This class will keep track if there is any contract evaluation going on currently. |
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* This is used to prevent endless loops of contracts using userland functions which are contracted themselves |
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* |
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* @author Bernhard Wick <[email protected]> |
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* @copyright 2015 TechDivision GmbH - <[email protected]> |
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* @license http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0) |
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* @link https://github.com/appserver-io/doppelgaenger |
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* @link http://www.appserver.io/ |
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*/ |
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class ContractContext |
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{ |
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/** |
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* @var int $contractDepth At which depth are we in the middle of an ongoing contract evaluation? |
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*/ |
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private static $contractDepth = 0; |
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/** |
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* @const int MAX_NESTING_DEPTH The maximum depth we allow. |
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*/ |
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const MAX_NESTING_DEPTH = 20; |
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/** |
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* Will open a contract context for any current ongoing verification. |
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* Will return true if successful (you are the only ongoing contract) and |
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* false if there already is something going on. |
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* |
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* @return bool |
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*/ |
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public static function open() |
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{ |
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if (self::$contractDepth < self::MAX_NESTING_DEPTH) { |
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// increment the contract depth |
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self::$contractDepth++; |
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return true; |
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} else { |
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// we reached max nesting level, tell them we were not able to open the contract |
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return false; |
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} |
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} |
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/** |
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* Is there an ongoing contract beyond the maximal depth? |
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* |
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* @return bool |
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*/ |
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public static function isOngoing() |
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{ |
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return !(self::$contractDepth <= self::MAX_NESTING_DEPTH); |
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} |
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/** |
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* Will close an open contract context for the ongoing verification. |
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* Will return true if contract was successfully closed and |
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* false if there was no contract at all. |
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* |
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* @throws \Exception |
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* |
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* @return bool |
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*/ |
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public static function close() |
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{ |
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if (self::$contractDepth <= self::MAX_NESTING_DEPTH && self::$contractDepth > 0) { |
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// Decrement the used depth |
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self::$contractDepth--; |
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return true; |
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} else { |
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// Did we reach a place where the sun does not shine (metaphorically speaking ;-) |
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if (self::$contractDepth < 0) { |
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// Reset the used up contract depth and fail |
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self::$contractDepth = 0; |
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throw new \Exception('Contract depth surveillance ran out of bounds!'); |
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} |
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return false; |
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} |
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} |
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} |
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appserver-io /
doppelgaenger
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