Interface Design Concepts in the Development of ELSA, an Intelligent Electronic Library Search Assistant.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Authors:	Denning, Rebecca, Smith, Philip J.
Format:	Recurso educativo Open Access
Language:	en
Published:	1994
Subjects:	Computer Software Development Electronic Libraries Expert Systems Guidelines Information Retrieval Library Automation Man Machine Systems Search Strategies User Needs (Information)
Online Access:	Acceder al recurso
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author	Denning, Rebecca Smith, Philip J.
author_facet	Denning, Rebecca Smith, Philip J. Denning, Rebecca Smith, Philip J.
collection	Education Resources Information Center
contents	Interface Design Concepts in the Development of ELSA, an Intelligent Electronic Library Search Assistant. Denning, Rebecca Smith, Philip J. Computer Software Development Electronic Libraries Expert Systems Guidelines Information Retrieval Library Automation Man Machine Systems Search Strategies User Needs (Information) Describes issues and advances in the design of appropriate inference engines and knowledge structures needed by commercially feasible intelligent intermediary systems for information retrieval. Issues associated with the design of interfaces to such functions are discussed in detail. Design principles for guiding implementation of these interfaces and a prototype are described. (Contains 44 references.) (KRN)
format	Recurso educativo Open Access
id	eric_EJ486789
institution	ERIC Institute of Education Sciences
language	en
publishDate	1994
record_format	eric
spellingShingle	Interface Design Concepts in the Development of ELSA, an Intelligent Electronic Library Search Assistant. Denning, Rebecca Smith, Philip J. Computer Software Development Electronic Libraries Expert Systems Guidelines Information Retrieval Library Automation Man Machine Systems Search Strategies User Needs (Information) Interface Design Concepts in the Development of ELSA, an Intelligent Electronic Library Search Assistant. Denning, Rebecca Smith, Philip J. Computer Software Development Electronic Libraries Expert Systems Guidelines Information Retrieval Library Automation Man Machine Systems Search Strategies User Needs (Information) Describes issues and advances in the design of appropriate inference engines and knowledge structures needed by commercially feasible intelligent intermediary systems for information retrieval. Issues associated with the design of interfaces to such functions are discussed in detail. Design principles for guiding implementation of these interfaces and a prototype are described. (Contains 44 references.) (KRN)
title	Interface Design Concepts in the Development of ELSA, an Intelligent Electronic Library Search Assistant.
topic	Computer Software Development Electronic Libraries Expert Systems Guidelines Information Retrieval Library Automation Man Machine Systems Search Strategies User Needs (Information)
url	https://eric.ed.gov/?id=EJ486789

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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