Experimentation With Computer-Assisted Indexing: American Documentation, Volume 20

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Authors:	Hines, Theodore C., And Others
Format:	Recurso educativo Open Access
Language:	en
Published:	1970
Subjects:	Automatic Indexing Automation Citations (References) Computer Programs Data Indexes Library Technical Processes Statistical Data
Online Access:	Acceder al recurso
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author	Hines, Theodore C. And Others
author_facet	Hines, Theodore C. And Others Hines, Theodore C. And Others
collection	Education Resources Information Center
contents	Experimentation With Computer-Assisted Indexing: American Documentation, Volume 20 Hines, Theodore C. And Others Automatic Indexing Automation Citations (References) Computer Programs Data Indexes Library Technical Processes Statistical Data The procedures used to produce the index to volume 20 (1969) of American Documentation are described to demonstrate a system for computer-assisted indexing and bibliographic production developed at the Columbia University School of Library Science. The system is demonstrated to be economic in comparison to currently used manual methods. (Author/MF)
format	Recurso educativo Open Access
id	eric_EJ030356
institution	ERIC Institute of Education Sciences
language	en
publishDate	1970
record_format	eric
spellingShingle	Experimentation With Computer-Assisted Indexing: American Documentation, Volume 20 Hines, Theodore C. And Others Automatic Indexing Automation Citations (References) Computer Programs Data Indexes Library Technical Processes Statistical Data Experimentation With Computer-Assisted Indexing: American Documentation, Volume 20 Hines, Theodore C. And Others Automatic Indexing Automation Citations (References) Computer Programs Data Indexes Library Technical Processes Statistical Data The procedures used to produce the index to volume 20 (1969) of American Documentation are described to demonstrate a system for computer-assisted indexing and bibliographic production developed at the Columbia University School of Library Science. The system is demonstrated to be economic in comparison to currently used manual methods. (Author/MF)
title	Experimentation With Computer-Assisted Indexing: American Documentation, Volume 20
topic	Automatic Indexing Automation Citations (References) Computer Programs Data Indexes Library Technical Processes Statistical Data
url	https://eric.ed.gov/?id=EJ030356

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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