Design Considerations for Capturing an Electronic Library.

Fuente: ERIC Institute of Education Sciences

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	Katsura, E., And Others
Format:	Recurso educativo Open Access
Sprache:	en
Veröffentlicht:	1992
Schlagworte:	Computer System Design Database Management Systems Electronic Libraries Information Retrieval Library Automation Selective Dissemination of Information Users (Information)
Online-Zugang:	Acceder al recurso
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

_version_	1867180953266290688
author	Katsura, E. And Others
author_facet	Katsura, E. And Others Katsura, E. And Others
collection	Education Resources Information Center
contents	Design Considerations for Capturing an Electronic Library. Katsura, E. And Others Computer System Design Database Management Systems Electronic Libraries Information Retrieval Library Automation Selective Dissemination of Information Users (Information) Discusses the theoretical frameworks and design considerations for an experimental electronic library system named Cybermagazine and considers the potential of multimedia approaches to information retrieval and delivery. Issues considered include current awareness services, user interface, database management, cataloging, and document delivery. (20 references) (EA)
format	Recurso educativo Open Access
id	eric_EJ456143
institution	ERIC Institute of Education Sciences
language	en
publishDate	1992
record_format	eric
spellingShingle	Design Considerations for Capturing an Electronic Library. Katsura, E. And Others Computer System Design Database Management Systems Electronic Libraries Information Retrieval Library Automation Selective Dissemination of Information Users (Information) Design Considerations for Capturing an Electronic Library. Katsura, E. And Others Computer System Design Database Management Systems Electronic Libraries Information Retrieval Library Automation Selective Dissemination of Information Users (Information) Discusses the theoretical frameworks and design considerations for an experimental electronic library system named Cybermagazine and considers the potential of multimedia approaches to information retrieval and delivery. Issues considered include current awareness services, user interface, database management, cataloging, and document delivery. (20 references) (EA)
title	Design Considerations for Capturing an Electronic Library.
topic	Computer System Design Database Management Systems Electronic Libraries Information Retrieval Library Automation Selective Dissemination of Information Users (Information)
url	https://eric.ed.gov/?id=EJ456143

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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Environment & details:

Environment & details: