Portrait: Carolyn Clark Morrow.

Fuente: ERIC Institute of Education Sciences

Gespeichert in:

Bibliographische Detailangaben
1. Verfasser:	Deitch, Joseph
Format:	Recurso educativo Open Access
Sprache:	en
Veröffentlicht:	1992
Schlagworte:	College Libraries Higher Education Librarians Library Collection Development Library Materials Microfilm Preservation
Online-Zugang:	Acceder al recurso
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

_version_	1867180737277460482
author	Deitch, Joseph
author_facet	Deitch, Joseph Deitch, Joseph
collection	Education Resources Information Center
contents	Portrait: Carolyn Clark Morrow. Deitch, Joseph College Libraries Higher Education Librarians Library Collection Development Library Materials Microfilm Preservation Discussion of Harvard University libraries' preservation efforts highlights the contributions of Carolyn Clark Morrow, the preservation librarian. Topics discussed include book decay; identifying important research collections to be preserved; chemical technology to deacidify paper; microfilming projects; components of a good local library preservation program; and deciding what books should be repaired. (LRW)
format	Recurso educativo Open Access
id	eric_EJ439903
institution	ERIC Institute of Education Sciences
language	en
publishDate	1992
record_format	eric
spellingShingle	Portrait: Carolyn Clark Morrow. Deitch, Joseph College Libraries Higher Education Librarians Library Collection Development Library Materials Microfilm Preservation Portrait: Carolyn Clark Morrow. Deitch, Joseph College Libraries Higher Education Librarians Library Collection Development Library Materials Microfilm Preservation Discussion of Harvard University libraries' preservation efforts highlights the contributions of Carolyn Clark Morrow, the preservation librarian. Topics discussed include book decay; identifying important research collections to be preserved; chemical technology to deacidify paper; microfilming projects; components of a good local library preservation program; and deciding what books should be repaired. (LRW)
title	Portrait: Carolyn Clark Morrow.
topic	College Libraries Higher Education Librarians Library Collection Development Library Materials Microfilm Preservation
url	https://eric.ed.gov/?id=EJ439903

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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Environment & details: