A Computer-Based Interlibrary Loan Communications Subsystem. Final Report.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Author:	Barrentine, James K.
Format:	Recurso educativo Open Access
Language:	en
Published:	1977
Subjects:	Information Systems Interlibrary Loans Libraries Library Automation Library Networks Reports Systems Development Telecommunications
Online Access:	Acceder al recurso
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author	Barrentine, James K.
author_facet	Barrentine, James K. Barrentine, James K.
collection	Education Resources Information Center
contents	A Computer-Based Interlibrary Loan Communications Subsystem. Final Report. Barrentine, James K. Information Systems Interlibrary Loans Libraries Library Automation Library Networks Reports Systems Development Telecommunications The OCLC Interlibrary Loan (ILL) Subsystem was designed to facilitate resource sharing among OCLC participating libraries, thereby enabling libraries to expand the range of library resources available to patrons. The final report describes subsystem design and functional uses of the ILL subsystem. A functional overview explains the file, searching, record creation, and ILL response. Descriptions of design and methodology in developing the subsystem, results of testing the subsystem, and prospective field testing are presented. A bibliography, list of system error messages, and reprint of an article on the subsystem are appended. (Author/KP)
format	Recurso educativo Open Access
id	eric_ED145861
institution	ERIC Institute of Education Sciences
language	en
publishDate	1977
record_format	eric
spellingShingle	A Computer-Based Interlibrary Loan Communications Subsystem. Final Report. Barrentine, James K. Information Systems Interlibrary Loans Libraries Library Automation Library Networks Reports Systems Development Telecommunications A Computer-Based Interlibrary Loan Communications Subsystem. Final Report. Barrentine, James K. Information Systems Interlibrary Loans Libraries Library Automation Library Networks Reports Systems Development Telecommunications The OCLC Interlibrary Loan (ILL) Subsystem was designed to facilitate resource sharing among OCLC participating libraries, thereby enabling libraries to expand the range of library resources available to patrons. The final report describes subsystem design and functional uses of the ILL subsystem. A functional overview explains the file, searching, record creation, and ILL response. Descriptions of design and methodology in developing the subsystem, results of testing the subsystem, and prospective field testing are presented. A bibliography, list of system error messages, and reprint of an article on the subsystem are appended. (Author/KP)
title	A Computer-Based Interlibrary Loan Communications Subsystem. Final Report.
topic	Information Systems Interlibrary Loans Libraries Library Automation Library Networks Reports Systems Development Telecommunications
url	https://eric.ed.gov/?id=ED145861

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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