A Design for a Mini-Computer Based Serials Control Network

Fuente: ERIC Institute of Education Sciences

Gespeichert in:

Bibliographische Detailangaben
1. Verfasser:	Johnson, Millard F., Jr.
Format:	Recurso educativo Open Access
Sprache:	en
Veröffentlicht:	1976
Schlagworte:	Computer Oriented Programs Library Automation Library Networks Medical Libraries Minicomputers Online Systems Serials
Online-Zugang:	Acceder al recurso
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_version_	1867180763661729792
author	Johnson, Millard F., Jr.
author_facet	Johnson, Millard F., Jr. Johnson, Millard F., Jr.
collection	Education Resources Information Center
contents	A Design for a Mini-Computer Based Serials Control Network Johnson, Millard F., Jr. Computer Oriented Programs Library Automation Library Networks Medical Libraries Minicomputers Online Systems Serials Describes PHILSOM III, the automated serials system of the Washington University School of Medicine Library. (PF)
format	Recurso educativo Open Access
id	eric_EJ141620
institution	ERIC Institute of Education Sciences
language	en
publishDate	1976
record_format	eric
spellingShingle	A Design for a Mini-Computer Based Serials Control Network Johnson, Millard F., Jr. Computer Oriented Programs Library Automation Library Networks Medical Libraries Minicomputers Online Systems Serials A Design for a Mini-Computer Based Serials Control Network Johnson, Millard F., Jr. Computer Oriented Programs Library Automation Library Networks Medical Libraries Minicomputers Online Systems Serials Describes PHILSOM III, the automated serials system of the Washington University School of Medicine Library. (PF)
title	A Design for a Mini-Computer Based Serials Control Network
topic	Computer Oriented Programs Library Automation Library Networks Medical Libraries Minicomputers Online Systems Serials
url	https://eric.ed.gov/?id=EJ141620

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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