Developing the Common Communication Format.

Fuente: ERIC Institute of Education Sciences

Saved in:

Bibliographic Details
Main Author:	Hopkinson, Alan
Format:	Recurso educativo Open Access
Language:	en
Published:	1986
Subjects:	Cataloging Databases Global Approach Information Networks Information Services Information Systems Library Technical Processes Online Systems Standards Telecommunications
Online Access:	Acceder al recurso
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author	Hopkinson, Alan
author_facet	Hopkinson, Alan Hopkinson, Alan
collection	Education Resources Information Center
contents	Developing the Common Communication Format. Hopkinson, Alan Cataloging Databases Global Approach Information Networks Information Services Information Systems Library Technical Processes Online Systems Standards Telecommunications Outlines history of the development of the Unesco Common Communication Format, which is designed to enable exchange of records (monographs, serials, journal articles, contributions in proceedings) between different agencies throughout the world. Highlights include definition of "exchange format," major technical features, and examples of current and future uses. (13 references) (EJS)
format	Recurso educativo Open Access
id	eric_EJ340313
institution	ERIC Institute of Education Sciences
language	en
publishDate	1986
record_format	eric
spellingShingle	Developing the Common Communication Format. Hopkinson, Alan Cataloging Databases Global Approach Information Networks Information Services Information Systems Library Technical Processes Online Systems Standards Telecommunications Developing the Common Communication Format. Hopkinson, Alan Cataloging Databases Global Approach Information Networks Information Services Information Systems Library Technical Processes Online Systems Standards Telecommunications Outlines history of the development of the Unesco Common Communication Format, which is designed to enable exchange of records (monographs, serials, journal articles, contributions in proceedings) between different agencies throughout the world. Highlights include definition of "exchange format," major technical features, and examples of current and future uses. (13 references) (EJS)
title	Developing the Common Communication Format.
topic	Cataloging Databases Global Approach Information Networks Information Services Information Systems Library Technical Processes Online Systems Standards Telecommunications
url	https://eric.ed.gov/?id=EJ340313

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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