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Bibliographic Details
Main Author:	Rafael Rodríguez-Puente
Format:	Artículo científico
Language:	es
Published:	Universidad de Tarapacá 2013
Subjects:	Ingeniería análisis de redes reducción de grafos Representación de redes búsqueda de caminos óptimos sistemas de información geográfica
Online Access:	https://www.redalyc.org/articulo.oa?id=77228820009
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Modelo para la representación de redes y búsqueda de caminos óptimos en Sistemas de Información Geográfica Rafael Rodríguez-Puente Manuel S. Lazo-Cortés Ingeniería análisis de redes reducción de grafos Representación de redes búsqueda de caminos óptimos sistemas de información geográfica Una de las funcionalidades presente en los sistemas de información geográfica es la búsqueda de caminos óptimos. En la actualidad, este tipo de funcionalidad se implementa sobre modelos que no garantizan escalabilidad y eficiencia cuando las redes son grandes. En este artículo se propone un modelo de representación de redes en Sistemas de Información Geográfica basado en el concepto de grafos reducidos. Este modelo permite realizar búsquedas de caminos óptimos en redes grandes de forma eficiente y escalable. Una característica relevante del modelo propuesto es la posibilidad de realizar análisis a escala en la red. 2013 artículo científico 0718-3291 https://www.redalyc.org/articulo.oa?id=77228820009 es http://www.redalyc.org/revista.oa?id=772 Ingeniare. Revista Chilena de Ingeniería application/pdf Universidad de Tarapacá Ingeniare. Revista Chilena de Ingeniería (Chile) Num.3 Vol.21

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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