Message Delivery System for the National Library and Information Service Network: General Requirements. Network Planning Paper Number 4, 1978.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Author:	Hartmann, David C., Ed.
Format:	Recurso educativo Open Access
Language:	en
Published:	1978
Subjects:	Delivery Systems Design Diagrams Information Networks Library Networks Methods Online Systems Program Descriptions Program Development
Online Access:	Acceder al recurso
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author	Hartmann, David C., Ed.
author_facet	Hartmann, David C., Ed. Hartmann, David C., Ed.
collection	Education Resources Information Center
contents	Message Delivery System for the National Library and Information Service Network: General Requirements. Network Planning Paper Number 4, 1978. Hartmann, David C., Ed. Delivery Systems Design Diagrams Information Networks Library Networks Methods Online Systems Program Descriptions Program Development The Message Delivery System described, a facility that will link automatic bibliographic services and permit the transmission of messages among the various services, is one of the basic requirements for the development of a comprehensive computerized bibliographic system of nationwide scope. The system will enable users of one system to have access to information and services on other systems that are part of the National Library and Information Service Network. This document lists the general technical requirements for the Message Delivery System and discusses the anticipated evolution of the network. It defines the scope of technical network activities, the system development methodology, and the technical work that must be undertaken to realize an operational network. (Author/MBR)
format	Recurso educativo Open Access
id	eric_ED168518
institution	ERIC Institute of Education Sciences
language	en
publishDate	1978
record_format	eric
spellingShingle	Message Delivery System for the National Library and Information Service Network: General Requirements. Network Planning Paper Number 4, 1978. Hartmann, David C., Ed. Delivery Systems Design Diagrams Information Networks Library Networks Methods Online Systems Program Descriptions Program Development Message Delivery System for the National Library and Information Service Network: General Requirements. Network Planning Paper Number 4, 1978. Hartmann, David C., Ed. Delivery Systems Design Diagrams Information Networks Library Networks Methods Online Systems Program Descriptions Program Development The Message Delivery System described, a facility that will link automatic bibliographic services and permit the transmission of messages among the various services, is one of the basic requirements for the development of a comprehensive computerized bibliographic system of nationwide scope. The system will enable users of one system to have access to information and services on other systems that are part of the National Library and Information Service Network. This document lists the general technical requirements for the Message Delivery System and discusses the anticipated evolution of the network. It defines the scope of technical network activities, the system development methodology, and the technical work that must be undertaken to realize an operational network. (Author/MBR)
title	Message Delivery System for the National Library and Information Service Network: General Requirements. Network Planning Paper Number 4, 1978.
topic	Delivery Systems Design Diagrams Information Networks Library Networks Methods Online Systems Program Descriptions Program Development
url	https://eric.ed.gov/?id=ED168518

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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