The ICAAP Project, Part Three: OSF Distributed Computing Environment.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Author:	Cantor, Scott
Format:	Recurso educativo Open Access
Language:	en
Published:	1997
Subjects:	Computer Networks Computer System Design Information Networks Information Services Information Systems Library Networks Shared Resources and Services World Wide Web
Online Access:	Acceder al recurso
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author	Cantor, Scott
author_facet	Cantor, Scott Cantor, Scott
collection	Education Resources Information Center
contents	The ICAAP Project, Part Three: OSF Distributed Computing Environment. Cantor, Scott Computer Networks Computer System Design Information Networks Information Services Information Systems Library Networks Shared Resources and Services World Wide Web DCE (Distributed Computing Environment) is a collection of services, tools, and libraries for building the infrastructure necessary for distributed computing within an enterprise. This articles discusses the Open Software Foundation (OSF); the components of DCE, including the Directory and Security Services, the Distributed Time Service, and the Distributed File System; and its relation to the Web. (AEF)
format	Recurso educativo Open Access
id	eric_EJ550899
institution	ERIC Institute of Education Sciences
language	en
publishDate	1997
record_format	eric
spellingShingle	The ICAAP Project, Part Three: OSF Distributed Computing Environment. Cantor, Scott Computer Networks Computer System Design Information Networks Information Services Information Systems Library Networks Shared Resources and Services World Wide Web The ICAAP Project, Part Three: OSF Distributed Computing Environment. Cantor, Scott Computer Networks Computer System Design Information Networks Information Services Information Systems Library Networks Shared Resources and Services World Wide Web DCE (Distributed Computing Environment) is a collection of services, tools, and libraries for building the infrastructure necessary for distributed computing within an enterprise. This articles discusses the Open Software Foundation (OSF); the components of DCE, including the Directory and Security Services, the Distributed Time Service, and the Distributed File System; and its relation to the Web. (AEF)
title	The ICAAP Project, Part Three: OSF Distributed Computing Environment.
topic	Computer Networks Computer System Design Information Networks Information Services Information Systems Library Networks Shared Resources and Services World Wide Web
url	https://eric.ed.gov/?id=EJ550899

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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