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Bibliographic Details
Main Authors:	Martin, Susan K., Ed., Butler, Brett, Ed.
Format:	Recurso educativo Open Access
Language:	en
Published:	1975
Subjects:	Bibliographies Cataloging College Libraries Conference Reports Indexing Information Centers Library Automation Library Circulation Library Networks Library Research Library Services Library Technical Processes Reference Services School Libraries Serials State of the Art Reviews
Online Access:	https://eric.ed.gov/?id=ED118103
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Library Automation; The State of the Art II. Papers Presented at the Preconference Institute on Library Automation (Las Vegas, Nevada, June 22-23, 1973). Martin, Susan K., Ed. Butler, Brett, Ed. Bibliographies Cataloging College Libraries Conference Reports Indexing Information Centers Library Automation Library Circulation Library Networks Library Research Library Services Library Technical Processes Reference Services School Libraries Serials State of the Art Reviews Eight papers are included in this report of the Preconference Institute on Library Automation, June 1973. Papers addressing automation in user services, cataloging systems, acquisitions systems, and personnel are presented. Other papers focus on a review of the trends in library automation and computer technology, innovative strategies in systems and automation, and the outlook for the future. An extensive bibliography on library automation covering the last half of 1971, all of 1972, and the first half of 1973 is provided. The bibliography is organized by subtopic and primarily covers activity in North America. (CH)

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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