Commentary on Librarians and Machine-Readable Data Files

Fuente: ERIC Institute of Education Sciences

Saved in:

Bibliographic Details
Main Author:	Carmichael, Nancy
Format:	Recurso educativo Open Access
Language:	en
Published:	1978
Subjects:	Information Dissemination Librarians Library Role Social Science Research Statistical Data
Online Access:	Acceder al recurso
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_version_	1867181465166413824
author	Carmichael, Nancy
author_facet	Carmichael, Nancy Carmichael, Nancy
collection	Education Resources Information Center
contents	Commentary on Librarians and Machine-Readable Data Files Carmichael, Nancy Information Dissemination Librarians Library Role Social Science Research Statistical Data The importance of machine readable data files (MRDF) produced as products of social science research is discussed, and formal and informal, short range and long range measures are suggested to increase the accessibility of information from policy makers, researchers, and students for librarians. (JPF)
format	Recurso educativo Open Access
id	eric_EJ187095
institution	ERIC Institute of Education Sciences
language	en
publishDate	1978
record_format	eric
spellingShingle	Commentary on Librarians and Machine-Readable Data Files Carmichael, Nancy Information Dissemination Librarians Library Role Social Science Research Statistical Data Commentary on Librarians and Machine-Readable Data Files Carmichael, Nancy Information Dissemination Librarians Library Role Social Science Research Statistical Data The importance of machine readable data files (MRDF) produced as products of social science research is discussed, and formal and informal, short range and long range measures are suggested to increase the accessibility of information from policy makers, researchers, and students for librarians. (JPF)
title	Commentary on Librarians and Machine-Readable Data Files
topic	Information Dissemination Librarians Library Role Social Science Research Statistical Data
url	https://eric.ed.gov/?id=EJ187095

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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