Helping You Buy: Integrated Library Systems

Fuente: ERIC Institute of Education Sciences

Enregistré dans:

Détails bibliographiques
Auteur principal:	Pace, Andrew K.
Format:	Recurso educativo Open Access
Langue:	en
Publié:	2005
Sujets:	Electronic Libraries Information Technology Library Automation Computer Mediated Communication Information Systems Computer Networks
Accès en ligne:	Acceder al recurso
Tags:	Ajouter un tag Pas de tags, Soyez le premier à ajouter un tag!

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author	Pace, Andrew K.
author_facet	Pace, Andrew K. Pace, Andrew K.
collection	Education Resources Information Center
contents	Helping You Buy: Integrated Library Systems Pace, Andrew K. Electronic Libraries Information Technology Library Automation Computer Mediated Communication Information Systems Computer Networks This Helping You Buy survey is the next in an annual series of surveys that have been compiled by Pamela Cibbarelli in past years. This bird's-eye view should serve to both highlight some general distinctions and to underscore the commodified similarities of a wide range of library automation systems.
format	Recurso educativo Open Access
id	eric_EJ718552
institution	ERIC Institute of Education Sciences
language	en
publishDate	2005
record_format	eric
spellingShingle	Helping You Buy: Integrated Library Systems Pace, Andrew K. Electronic Libraries Information Technology Library Automation Computer Mediated Communication Information Systems Computer Networks Helping You Buy: Integrated Library Systems Pace, Andrew K. Electronic Libraries Information Technology Library Automation Computer Mediated Communication Information Systems Computer Networks This Helping You Buy survey is the next in an annual series of surveys that have been compiled by Pamela Cibbarelli in past years. This bird's-eye view should serve to both highlight some general distinctions and to underscore the commodified similarities of a wide range of library automation systems.
title	Helping You Buy: Integrated Library Systems
topic	Electronic Libraries Information Technology Library Automation Computer Mediated Communication Information Systems Computer Networks
url	https://eric.ed.gov/?id=EJ718552

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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