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Bibliographic Details
Main Author:	Hayes, R. M.
Format:	Recurso educativo Open Access
Language:	en
Published:	1973
Subjects:	Computers Cost Effectiveness Feasibility Studies Guides Information Systems Interlibrary Loans Library Networks Performance Specifications Time Sharing
Online Access:	https://eric.ed.gov/?id=ED090999
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author	Hayes, R. M.
author_facet	Hayes, R. M. Hayes, R. M.
collection	Education Resources Information Center
contents	A System for Inter-Library Communication (SILC). Final Report. Hayes, R. M. Computers Cost Effectiveness Feasibility Studies Guides Information Systems Interlibrary Loans Library Networks Performance Specifications Time Sharing A study was made of the use of time-sharing computer systems as a means of communication, accounting, message switching, and referral in a System for Inter-Library Communication (SILC). The purpose of the study was to develop data on which to evaluate the feasibility of such a system; the results are reported in terms of four issues: technical feasibility, operational feasibility, management feasibility, and economic feasibility. The evaluations are essentially positive with respect to all four issues, and the report recommends proceeding further in development and pilot test of the operation. The report starts with an introduction, in which the background for the study is presented, the conclusions concerning feasibility are summarized, and the recommendations made. It is followed by a section presenting specifications for SILC: the concept, the functions, the parameters of operation. The results of study of each of the four issues with respect to feasibility are then presented. The report concludes with several appendixes: a bibliography of references, a glossary, a draft program for steps in future development, and a draft operations manual. (Author)
format	Recurso educativo Open Access
id	eric_ED090999
institution	ERIC Institute of Education Sciences
language	en
publishDate	1973
record_format	eric
spellingShingle	A System for Inter-Library Communication (SILC). Final Report. Hayes, R. M. Computers Cost Effectiveness Feasibility Studies Guides Information Systems Interlibrary Loans Library Networks Performance Specifications Time Sharing A System for Inter-Library Communication (SILC). Final Report. Hayes, R. M. Computers Cost Effectiveness Feasibility Studies Guides Information Systems Interlibrary Loans Library Networks Performance Specifications Time Sharing A study was made of the use of time-sharing computer systems as a means of communication, accounting, message switching, and referral in a System for Inter-Library Communication (SILC). The purpose of the study was to develop data on which to evaluate the feasibility of such a system; the results are reported in terms of four issues: technical feasibility, operational feasibility, management feasibility, and economic feasibility. The evaluations are essentially positive with respect to all four issues, and the report recommends proceeding further in development and pilot test of the operation. The report starts with an introduction, in which the background for the study is presented, the conclusions concerning feasibility are summarized, and the recommendations made. It is followed by a section presenting specifications for SILC: the concept, the functions, the parameters of operation. The results of study of each of the four issues with respect to feasibility are then presented. The report concludes with several appendixes: a bibliography of references, a glossary, a draft program for steps in future development, and a draft operations manual. (Author)
title	A System for Inter-Library Communication (SILC). Final Report.
topic	Computers Cost Effectiveness Feasibility Studies Guides Information Systems Interlibrary Loans Library Networks Performance Specifications Time Sharing
url	https://eric.ed.gov/?id=ED090999

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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