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Bibliographic Details
Main Author:	Nozik, Barbara A.
Format:	Recurso educativo Open Access
Language:	en
Published:	1974
Subjects:	Book Catalogs Cataloging College Libraries Costs Databases Information Centers Library Automation Library Catalogs Library Expenditures Library Networks Library Research Library Technical Processes Microforms Online Systems Research Libraries
Online Access:	https://eric.ed.gov/?id=ED122795
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author	Nozik, Barbara A.
author_facet	Nozik, Barbara A. Nozik, Barbara A.
collection	Education Resources Information Center
contents	Alternative Physical Forms for Library Catalogs: Card, Book, Microform, On-Line. A Working Paper Prepared for the Subcommittee on the Future of the Catalogs. Nozik, Barbara A. Book Catalogs Cataloging College Libraries Costs Databases Information Centers Library Automation Library Catalogs Library Expenditures Library Networks Library Research Library Technical Processes Microforms Online Systems Research Libraries This is a general descriptive and comparative report on alternative forms of library catalogs. The specific problems and factors associated with library catalogs are introduced briefly and then treated with respect to the following physical forms: card catalogs, book catalogs, microforms, and on-line catalogs. Whenever possible, examples of existing catalog systems are cited. An attempt is made to identify major cost factors of each physical form relative to production, maintenance, and use. In addition, potential effects of the various catalog forms on a decentralized library system are considered. (CH)
format	Recurso educativo Open Access
id	eric_ED122795
institution	ERIC Institute of Education Sciences
language	en
publishDate	1974
record_format	eric
spellingShingle	Alternative Physical Forms for Library Catalogs: Card, Book, Microform, On-Line. A Working Paper Prepared for the Subcommittee on the Future of the Catalogs. Nozik, Barbara A. Book Catalogs Cataloging College Libraries Costs Databases Information Centers Library Automation Library Catalogs Library Expenditures Library Networks Library Research Library Technical Processes Microforms Online Systems Research Libraries Alternative Physical Forms for Library Catalogs: Card, Book, Microform, On-Line. A Working Paper Prepared for the Subcommittee on the Future of the Catalogs. Nozik, Barbara A. Book Catalogs Cataloging College Libraries Costs Databases Information Centers Library Automation Library Catalogs Library Expenditures Library Networks Library Research Library Technical Processes Microforms Online Systems Research Libraries This is a general descriptive and comparative report on alternative forms of library catalogs. The specific problems and factors associated with library catalogs are introduced briefly and then treated with respect to the following physical forms: card catalogs, book catalogs, microforms, and on-line catalogs. Whenever possible, examples of existing catalog systems are cited. An attempt is made to identify major cost factors of each physical form relative to production, maintenance, and use. In addition, potential effects of the various catalog forms on a decentralized library system are considered. (CH)
title	Alternative Physical Forms for Library Catalogs: Card, Book, Microform, On-Line. A Working Paper Prepared for the Subcommittee on the Future of the Catalogs.
topic	Book Catalogs Cataloging College Libraries Costs Databases Information Centers Library Automation Library Catalogs Library Expenditures Library Networks Library Research Library Technical Processes Microforms Online Systems Research Libraries
url	https://eric.ed.gov/?id=ED122795

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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