The Power of Imaging.

Fuente: ERIC Institute of Education Sciences

Gespeichert in:

Bibliographische Detailangaben
1. Verfasser:	Haapaniemi, Peter
Format:	Recurso educativo Open Access
Sprache:	en
Veröffentlicht:	1990
Schlagworte:	Archives Banking Computer Storage Devices Engineering Geography Information Management Information Retrieval Information Storage Information Systems Information Technology Optical Disks Preservation
Online-Zugang:	Acceder al recurso
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

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author	Haapaniemi, Peter
author_facet	Haapaniemi, Peter Haapaniemi, Peter
collection	Education Resources Information Center
contents	The Power of Imaging. Haapaniemi, Peter Archives Banking Computer Storage Devices Engineering Geography Information Management Information Retrieval Information Storage Information Systems Information Technology Optical Disks Preservation Describes imaging technology, which allows huge numbers of words and illustrations to be reduced to tiny fraction of space required by originals and discusses current applications. Highlights include image processing system at National Archives; use by banks for high-speed check processing; engineering document management systems (EDMS); folder document management systems (FDMS); and geographic information systems (GIS). (LRW)
format	Recurso educativo Open Access
id	eric_EJ423360
institution	ERIC Institute of Education Sciences
language	en
publishDate	1990
record_format	eric
spellingShingle	The Power of Imaging. Haapaniemi, Peter Archives Banking Computer Storage Devices Engineering Geography Information Management Information Retrieval Information Storage Information Systems Information Technology Optical Disks Preservation The Power of Imaging. Haapaniemi, Peter Archives Banking Computer Storage Devices Engineering Geography Information Management Information Retrieval Information Storage Information Systems Information Technology Optical Disks Preservation Describes imaging technology, which allows huge numbers of words and illustrations to be reduced to tiny fraction of space required by originals and discusses current applications. Highlights include image processing system at National Archives; use by banks for high-speed check processing; engineering document management systems (EDMS); folder document management systems (FDMS); and geographic information systems (GIS). (LRW)
title	The Power of Imaging.
topic	Archives Banking Computer Storage Devices Engineering Geography Information Management Information Retrieval Information Storage Information Systems Information Technology Optical Disks Preservation
url	https://eric.ed.gov/?id=EJ423360

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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