Digital Libraries: The Grand Challenges.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Author:	Garrett, John R.
Format:	Recurso educativo Open Access
Language:	en
Published:	1993
Subjects:	Access to Information Costs Economic Factors Electronic Libraries Futures (of Society) Government Role Information Technology Leadership Library Automation Library Networks Library Planning Problems Social Influences
Online Access:	Acceder al recurso
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author	Garrett, John R.
author_facet	Garrett, John R. Garrett, John R.
collection	Education Resources Information Center
contents	Digital Libraries: The Grand Challenges. Garrett, John R. Access to Information Costs Economic Factors Electronic Libraries Futures (of Society) Government Role Information Technology Leadership Library Automation Library Networks Library Planning Problems Social Influences Describes the technical, economic, social, and cultural challenges to building a national digital library system. Selecting and filtering information, building and scaling distributed digital library networks, invoicing, payment, authorizing access, the locus of planning leadership, and the information poor are discussed. (Contains three references.) (KRN)
format	Recurso educativo Open Access
id	eric_EJ467305
institution	ERIC Institute of Education Sciences
language	en
publishDate	1993
record_format	eric
spellingShingle	Digital Libraries: The Grand Challenges. Garrett, John R. Access to Information Costs Economic Factors Electronic Libraries Futures (of Society) Government Role Information Technology Leadership Library Automation Library Networks Library Planning Problems Social Influences Digital Libraries: The Grand Challenges. Garrett, John R. Access to Information Costs Economic Factors Electronic Libraries Futures (of Society) Government Role Information Technology Leadership Library Automation Library Networks Library Planning Problems Social Influences Describes the technical, economic, social, and cultural challenges to building a national digital library system. Selecting and filtering information, building and scaling distributed digital library networks, invoicing, payment, authorizing access, the locus of planning leadership, and the information poor are discussed. (Contains three references.) (KRN)
title	Digital Libraries: The Grand Challenges.
topic	Access to Information Costs Economic Factors Electronic Libraries Futures (of Society) Government Role Information Technology Leadership Library Automation Library Networks Library Planning Problems Social Influences
url	https://eric.ed.gov/?id=EJ467305

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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