Value at Risk (VaR)

Fuente: Redalyc

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Bibliographische Detailangaben
1. Verfasser:	Juan Gaytán Cortés
Format:	Artículo científico
Sprache:	en
Veröffentlicht:	Universidad de Guadalajara 2022
Schlagworte:	Multidisciplinarias (Ciencias Sociales)
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_version_	1876479689479946240
author	Juan Gaytán Cortés
author_facet	Juan Gaytán Cortés
contents	Value at Risk (VaR) Juan Gaytán Cortés Multidisciplinarias (Ciencias Sociales) 2022 artículo científico 1665-7039 https://www.redalyc.org/articulo.oa?id=571869209010 https://www.redalyc.org/journal/5718/571869209010/ https://www.redalyc.org/journal/5718/571869209010/html/ https://www.redalyc.org/journal/5718/571869209010/571869209010.epub https://www.redalyc.org/journal/5718/571869209010/movil https://doi.org/10.32870/myn.vi45.7665 en http://www.redalyc.org/revista.oa?id=5718 Mercados y Negocios application/pdf Universidad de Guadalajara Mercados y Negocios (México) Num.45
format	Artículo científico
id	redalyc_571869209010
institution	Redalyc
language	en
publishDate	2022
publisher	Universidad de Guadalajara
spellingShingle	Value at Risk (VaR) Juan Gaytán Cortés Multidisciplinarias (Ciencias Sociales) Value at Risk (VaR) Juan Gaytán Cortés Multidisciplinarias (Ciencias Sociales) 2022 artículo científico 1665-7039 https://www.redalyc.org/articulo.oa?id=571869209010 https://www.redalyc.org/journal/5718/571869209010/ https://www.redalyc.org/journal/5718/571869209010/html/ https://www.redalyc.org/journal/5718/571869209010/571869209010.epub https://www.redalyc.org/journal/5718/571869209010/movil https://doi.org/10.32870/myn.vi45.7665 en http://www.redalyc.org/revista.oa?id=5718 Mercados y Negocios application/pdf Universidad de Guadalajara Mercados y Negocios (México) Num.45
title	Value at Risk (VaR)
topic	Multidisciplinarias (Ciencias Sociales)
url	https://www.redalyc.org/articulo.oa?id=571869209010 https://www.redalyc.org/journal/5718/571869209010/ https://www.redalyc.org/journal/5718/571869209010/html/ https://www.redalyc.org/journal/5718/571869209010/571869209010.epub https://www.redalyc.org/journal/5718/571869209010/movil https://doi.org/10.32870/myn.vi45.7665

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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