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Bibliographic Details
Main Authors:	Yeatts, Wendell A., Jr., Reilly, Kevin D.
Format:	Recurso educativo Open Access
Language:	en
Published:	1967
Subjects:	Automation Cataloging College Libraries Computer Programs Documentation Information Processing Information Services Information Storage Library Cooperation Library Research Library Technical Processes Programing Problems
Online Access:	https://eric.ed.gov/?id=ED023418
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Experience with Library of Congress MARC Tapes. Final Report on Mechanized Information Services in the University Library, Phase I - Planning. Part 7. Yeatts, Wendell A., Jr. Reilly, Kevin D. Automation Cataloging College Libraries Computer Programs Documentation Information Processing Information Services Information Storage Library Cooperation Library Research Library Technical Processes Programing Problems The purpose of the Library of Congress Machine-Readable Cataloging (MARC) pilot project was to provide libraries with catalog data encoded on magnetic tape in order to determine the feasibility of centralized computerized cataloging in support of library functions. Sixteen participants were selected on the basis of expressed interest, available staff, access to computers and associated equipment, and proposed applications. The weekly tapes were used by the participants for two basic purposes: (1) using the data in everyday library processing, and (2) using the data to provide extra services such as machine searching. Experiences at the University of California, Los Angeles (UCLA), which used the MARC information to produce catalog cards and alphabetize subject lists for use in book selection, indicated that there were problem areas both in using the programs provided and in creating new programs for processing tapes organized in the MARC format. In general the experiments at UCLA demonstrated that (1) it takes longer to plan and implement automated library procedures than most library administrators suspect, and (2) a full-scale nationwide MARC distribution service could not be realistically utilized without a substantial "lead time" for libraries to prepare themselves for processing the data. A listing of the programs developed at UCLA is also given. (CM)

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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