Providing Access to the 1990 U.S. Census Maps.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Author:	Weintrop, Jane
Format:	Recurso educativo Open Access
Language:	en
Published:	1995
Subjects:	Access to Information Census Figures Depository Libraries Government Publications Indexing Information Storage Librarians Library Services Maps Optical Data Disks Preservation Statistical Data User Needs (Information)
Online Access:	Acceder al recurso
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author	Weintrop, Jane
author_facet	Weintrop, Jane Weintrop, Jane
collection	Education Resources Information Center
contents	Providing Access to the 1990 U.S. Census Maps. Weintrop, Jane Access to Information Census Figures Depository Libraries Government Publications Indexing Information Storage Librarians Library Services Maps Optical Data Disks Preservation Statistical Data User Needs (Information) The U.S. Bureau of the Census has published on CD-ROM data for the smallest geographic reporting levels, and depository librarians must decide what level of support they will provide for patrons who want to access the material. Discussion includes preservation and storage of census maps for easy access, and indexing the information contained on the maps. (Author/AEF)
format	Recurso educativo Open Access
id	eric_EJ508718
institution	ERIC Institute of Education Sciences
language	en
publishDate	1995
record_format	eric
spellingShingle	Providing Access to the 1990 U.S. Census Maps. Weintrop, Jane Access to Information Census Figures Depository Libraries Government Publications Indexing Information Storage Librarians Library Services Maps Optical Data Disks Preservation Statistical Data User Needs (Information) Providing Access to the 1990 U.S. Census Maps. Weintrop, Jane Access to Information Census Figures Depository Libraries Government Publications Indexing Information Storage Librarians Library Services Maps Optical Data Disks Preservation Statistical Data User Needs (Information) The U.S. Bureau of the Census has published on CD-ROM data for the smallest geographic reporting levels, and depository librarians must decide what level of support they will provide for patrons who want to access the material. Discussion includes preservation and storage of census maps for easy access, and indexing the information contained on the maps. (Author/AEF)
title	Providing Access to the 1990 U.S. Census Maps.
topic	Access to Information Census Figures Depository Libraries Government Publications Indexing Information Storage Librarians Library Services Maps Optical Data Disks Preservation Statistical Data User Needs (Information)
url	https://eric.ed.gov/?id=EJ508718

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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