Problems in the Preservation of Electronic Records.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Authors:	Lin, Lim Siew, Ramaiah, Chennupati K., Wal, Pitt Kuan
Format:	Recurso educativo Open Access
Language:	en
Published:	2003
Subjects:	Information Storage Legal Problems Metadata Preservation
Online Access:	Acceder al recurso
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_version_	1867181460393295872
author	Lin, Lim Siew Ramaiah, Chennupati K. Wal, Pitt Kuan
author_facet	Lin, Lim Siew Ramaiah, Chennupati K. Wal, Pitt Kuan Lin, Lim Siew Ramaiah, Chennupati K. Wal, Pitt Kuan
collection	Education Resources Information Center
contents	Problems in the Preservation of Electronic Records. Lin, Lim Siew Ramaiah, Chennupati K. Wal, Pitt Kuan Information Storage Legal Problems Metadata Preservation Discusses issues related to the preservation of electronic records. Highlights include differences between physical and electronic records; volume of electronic records; physical media; authenticity; migration of electronic records; metadata; legal issues; improved storage media; and projects for preservation of electronic records. (LRW)
format	Recurso educativo Open Access
id	eric_EJ678959
institution	ERIC Institute of Education Sciences
language	en
publishDate	2003
record_format	eric
spellingShingle	Problems in the Preservation of Electronic Records. Lin, Lim Siew Ramaiah, Chennupati K. Wal, Pitt Kuan Information Storage Legal Problems Metadata Preservation Problems in the Preservation of Electronic Records. Lin, Lim Siew Ramaiah, Chennupati K. Wal, Pitt Kuan Information Storage Legal Problems Metadata Preservation Discusses issues related to the preservation of electronic records. Highlights include differences between physical and electronic records; volume of electronic records; physical media; authenticity; migration of electronic records; metadata; legal issues; improved storage media; and projects for preservation of electronic records. (LRW)
title	Problems in the Preservation of Electronic Records.
topic	Information Storage Legal Problems Metadata Preservation
url	https://eric.ed.gov/?id=EJ678959

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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