Pioneers of the Online Age.

Fuente: ERIC Institute of Education Sciences

Salvato in:

Dettagli Bibliografici
Autore principale:	Hahn, Trudi Bellardo
Natura:	Recurso educativo Open Access
Lingua:	en
Pubblicazione:	1996
Soggetti:	Administrators Designers Information Retrieval Information Services Library Development Online Searching Online Systems Programmers Researchers Technological Advancement Trainers Users (Information)
Accesso online:	Acceder al recurso
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author	Hahn, Trudi Bellardo
author_facet	Hahn, Trudi Bellardo Hahn, Trudi Bellardo
collection	Education Resources Information Center
contents	Pioneers of the Online Age. Hahn, Trudi Bellardo Administrators Designers Information Retrieval Information Services Library Development Online Searching Online Systems Programmers Researchers Technological Advancement Trainers Users (Information) Describes the historical development of online information retrieval systems and services. Gives an overview of the three pioneer groups of the online age: (1) programmers, system designers, and researchers; (2) managers, trainers, and custom service representatives; and (3) users. Also examines those individuals who made exceptional contributions to online systems and services. Contains 71 references. (Author/JMV)
format	Recurso educativo Open Access
id	eric_EJ516520
institution	ERIC Institute of Education Sciences
language	en
publishDate	1996
record_format	eric
spellingShingle	Pioneers of the Online Age. Hahn, Trudi Bellardo Administrators Designers Information Retrieval Information Services Library Development Online Searching Online Systems Programmers Researchers Technological Advancement Trainers Users (Information) Pioneers of the Online Age. Hahn, Trudi Bellardo Administrators Designers Information Retrieval Information Services Library Development Online Searching Online Systems Programmers Researchers Technological Advancement Trainers Users (Information) Describes the historical development of online information retrieval systems and services. Gives an overview of the three pioneer groups of the online age: (1) programmers, system designers, and researchers; (2) managers, trainers, and custom service representatives; and (3) users. Also examines those individuals who made exceptional contributions to online systems and services. Contains 71 references. (Author/JMV)
title	Pioneers of the Online Age.
topic	Administrators Designers Information Retrieval Information Services Library Development Online Searching Online Systems Programmers Researchers Technological Advancement Trainers Users (Information)
url	https://eric.ed.gov/?id=EJ516520

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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