Recent Developments in Social Science Research

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Author:	Jenness, David
Format:	Recurso educativo Open Access
Language:	en
Published:	1978
Subjects:	Information Dissemination Library Role Longitudinal Studies Social Indicators Social Science Research Special Libraries Statistical Data
Online Access:	Acceder al recurso
Tags:	Add Tag No Tags, Be the first to tag this record!

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author	Jenness, David
author_facet	Jenness, David Jenness, David
collection	Education Resources Information Center
contents	Recent Developments in Social Science Research Jenness, David Information Dissemination Library Role Longitudinal Studies Social Indicators Social Science Research Special Libraries Statistical Data In this discussion of recent theoretical and methodological developments in three selected areas of the social sciences--social indicators, social experimentation and evaluation, and longitudinal studies, attention is given to the growing availability of machine-readable data sets and to special archives and resources of interest to librarians. (Author/JPF)
format	Recurso educativo Open Access
id	eric_EJ187094
institution	ERIC Institute of Education Sciences
language	en
publishDate	1978
record_format	eric
spellingShingle	Recent Developments in Social Science Research Jenness, David Information Dissemination Library Role Longitudinal Studies Social Indicators Social Science Research Special Libraries Statistical Data Recent Developments in Social Science Research Jenness, David Information Dissemination Library Role Longitudinal Studies Social Indicators Social Science Research Special Libraries Statistical Data In this discussion of recent theoretical and methodological developments in three selected areas of the social sciences--social indicators, social experimentation and evaluation, and longitudinal studies, attention is given to the growing availability of machine-readable data sets and to special archives and resources of interest to librarians. (Author/JPF)
title	Recent Developments in Social Science Research
topic	Information Dissemination Library Role Longitudinal Studies Social Indicators Social Science Research Special Libraries Statistical Data
url	https://eric.ed.gov/?id=EJ187094

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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