When We Get the Libraries We Want, Will We Want the Libraries We Get?

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Authors:	Seiler, Lauren, Surprenant, Thomas
Format:	Recurso educativo Open Access
Language:	en
Published:	1991
Subjects:	Access to Information Centralization Competition Costs Futures (of Society) Information Technology Library Automation Library Role Library Services Publishing Industry
Online Access:	Acceder al recurso
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_version_	1867180664289230848
author	Seiler, Lauren Surprenant, Thomas
author_facet	Seiler, Lauren Surprenant, Thomas Seiler, Lauren Surprenant, Thomas
collection	Education Resources Information Center
contents	When We Get the Libraries We Want, Will We Want the Libraries We Get? Seiler, Lauren Surprenant, Thomas Access to Information Centralization Competition Costs Futures (of Society) Information Technology Library Automation Library Role Library Services Publishing Industry Considers changes that technology could make in libraries in the future. Highlights include digital formats; centralization of libraries and library services; the role of librarians; competition between libraries and for-profit information vendors; the publication process; the integrity of information in electronic format; costs; and access to information. (LRW)
format	Recurso educativo Open Access
id	eric_EJ428937
institution	ERIC Institute of Education Sciences
language	en
publishDate	1991
record_format	eric
spellingShingle	When We Get the Libraries We Want, Will We Want the Libraries We Get? Seiler, Lauren Surprenant, Thomas Access to Information Centralization Competition Costs Futures (of Society) Information Technology Library Automation Library Role Library Services Publishing Industry When We Get the Libraries We Want, Will We Want the Libraries We Get? Seiler, Lauren Surprenant, Thomas Access to Information Centralization Competition Costs Futures (of Society) Information Technology Library Automation Library Role Library Services Publishing Industry Considers changes that technology could make in libraries in the future. Highlights include digital formats; centralization of libraries and library services; the role of librarians; competition between libraries and for-profit information vendors; the publication process; the integrity of information in electronic format; costs; and access to information. (LRW)
title	When We Get the Libraries We Want, Will We Want the Libraries We Get?
topic	Access to Information Centralization Competition Costs Futures (of Society) Information Technology Library Automation Library Role Library Services Publishing Industry
url	https://eric.ed.gov/?id=EJ428937

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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