Information Access for a Digital Library: Cheshire II and the Berkeley Environmental Digital Library.

Fuente: ERIC Institute of Education Sciences

Saved in:

Bibliographic Details
Main Authors:	Larson, Ray R., Carson, Chad
Format:	Recurso educativo Open Access
Language:	en
Published:	1999
Subjects:	Academic Libraries Computer System Design Document Delivery Higher Education Information Retrieval Information Systems Library Catalogs Online Catalogs Online Searching
Online Access:	Acceder al recurso
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_version_	1867180860677029889
author	Larson, Ray R. Carson, Chad
author_facet	Larson, Ray R. Carson, Chad Larson, Ray R. Carson, Chad
collection	Education Resources Information Center
contents	Information Access for a Digital Library: Cheshire II and the Berkeley Environmental Digital Library. Larson, Ray R. Carson, Chad Academic Libraries Computer System Design Document Delivery Higher Education Information Retrieval Information Systems Library Catalogs Online Catalogs Online Searching Reviews the characteristics of the Cheshire II system that is being used to implement full-text and fielded searching of bibliographic information for the University of California Berkeley Digital Library Initiative. Examines its performance when applied to a collection of large full-text documents in the TREC Interactive Retrieval Track and its performance in Blobworld image searching. (AEF)
format	Recurso educativo Open Access
id	eric_EJ597601
institution	ERIC Institute of Education Sciences
language	en
publishDate	1999
record_format	eric
spellingShingle	Information Access for a Digital Library: Cheshire II and the Berkeley Environmental Digital Library. Larson, Ray R. Carson, Chad Academic Libraries Computer System Design Document Delivery Higher Education Information Retrieval Information Systems Library Catalogs Online Catalogs Online Searching Information Access for a Digital Library: Cheshire II and the Berkeley Environmental Digital Library. Larson, Ray R. Carson, Chad Academic Libraries Computer System Design Document Delivery Higher Education Information Retrieval Information Systems Library Catalogs Online Catalogs Online Searching Reviews the characteristics of the Cheshire II system that is being used to implement full-text and fielded searching of bibliographic information for the University of California Berkeley Digital Library Initiative. Examines its performance when applied to a collection of large full-text documents in the TREC Interactive Retrieval Track and its performance in Blobworld image searching. (AEF)
title	Information Access for a Digital Library: Cheshire II and the Berkeley Environmental Digital Library.
topic	Academic Libraries Computer System Design Document Delivery Higher Education Information Retrieval Information Systems Library Catalogs Online Catalogs Online Searching
url	https://eric.ed.gov/?id=EJ597601

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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