Open Systems Sing a Siren Song.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Author:	Webb, Terry D.
Format:	Recurso educativo Open Access
Language:	en
Published:	1987
Subjects:	Comparative Analysis Library Automation Man Machine Systems Online Systems Online Vendors Reliability Systems Development Technological Advancement Use Studies
Online Access:	Acceder al recurso
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Design of Inhouse Automated Library Systems.
by: Cortez, Edwin M.
Published: (1984)

Integrated vs. Stand-Alone Systems.
by: Kline, Norman
Published: (1986)

Microcomputers and Online Catalogs.
by: Gorman, Michael
Published: (1984)

The Uniform Catalog.
by: Buckel, William L.
Published: (1986)

Open Systems: A Second Opinion.
by: Rice, James
Published: (1987)

Library Automation: Today's Successes and Concerns.
by: Cibbarelli, Pamela
Published: (1999)

Library Networking in North America in the 1980s. Part 1: The Dreams; the Realities.
by: Hildreth, Charles R.
Published: (1987)

Online Public Access Catalog Research in the United Kingdom: An Overview.
by: Kinsella, Janet, et al.
Published: (1987)

An Evaluation of a Gateway System for Automated Online Database Selection.
by: Hu, Chengren
Published: (1988)

Jockeying for Supremacy in a Networked World.
by: Barry, Jeff, et al.
Published: (1996)

Online Catalogs: Coping with the Choices.
by: Horny, Karen L.
Published: (1982)

Automation Marketplace 2010: New Models, Core Systems
by: Breeding, Marshall
Published: (2010)

Catalog Use at the University of Wisconsin-Stout: A Comparative Study.
by: Richards, Mary
Published: (1987)

In-House Automation of a Small Library Using a Mainframe Computer.
by: Waranius, Frances B., et al.
Published: (1986)

LibGuides: A CMS for Busy Librarians
by: Verbit, Daniel, et al.
Published: (2011)

Distributed Processors and Processing with Microcomputers.
by: Noerr, K. T. Bivins, et al.
Published: (1983)

Library Research: A Ten Year Analysis of the Library Automation Marketplace: 1981-1990.
by: Fivecoat, Martha H.
Published: (1992)

Beyond Boolean: Designing the Next Generation of Online Catalogs.
by: Hildreth, Charles R.
Published: (1987)

Integrated Online Library Systems: Perspectives, Perceptions, and Practicalities.
by: De Gennaro, Richard
Published: (1985)

Responding to an RFP: A Vendor's Viewpoint.
by: Kington, Robert A.
Published: (1987)

Modern Subject Access in the Online Age.
by: Cochrane, Pauline A., et al.
Published: (1984)

The Human Dimension of the Catalog: Concepts and Constraints in Information Seeking.
by: Estabrook, Leigh
Published: (1983)

A Study of Six Online Public Access Catalogs: A Review of Findings. Final Report.
by: Matthews, Joseph R.
Published: (1982)

Current Offerings in Automated Authority Control: A Survey of Vendors.
by: Johnston, Sarah Hager
Published: (1989)

Truth in Automating: The Multi-Library Experience. A Forum.
by: Drabenstott, Jon, Ed.
Published: (1989)

Some Crystal Ball Gazing from a Variety of Viewpoints.
by: Conger, Lucinda D., et al.
Published: (1987)

The Vendors' Corner--The Request for Proposal.
by: Sugnet, Chris, et al.
Published: (1987)

Four Online Database Vendors: An Evaluation and Cost Analysis of Their Cataloging Support Services.
by: Chan, Anthony P.
Published: (1990)

The Automation of Government Publications: Functional Requirements and Selected Software Systems for Serials Controls.
by: Stephenson, Mary Sue, et al.
Published: (1985)

Libraries and Computers: Disaster Prevention and Recovery.
by: Miller, R. Bruce
Published: (1988)

Library Automation: A State of the Art.
by: Corbin, John
Published: (1979)

Standards: Where Are We Headed? A Forum.
by: Sugnet, Chris, Ed.
Published: (1986)

Users Look at Online Catalogs. Part 2: Interacting with Online Catalogs. Final Report.
by: Larson, Ray R.
Published: (1983)

Usage Rates among TWU-ERIC and Other ERIC Bibliographic Systems on the Texas Woman's University, Denton, Campus.
by: Galloway, James W.
Published: (1988)

The RFP--Request for Punishment: Or a Tool for Selecting an Automated Library System.
by: Matthews, Joseph R., et al.
Published: (1987)

An Unfolding, Not an Unveiling: Creating an Online Public Library.
by: Nielsen, Brian
Published: (1984)

Library Automation: Hitting the Links.
by: Potter, William G.
Published: (1988)

Library of Congress Online Public Catalog Users Survey.
by: Anderson, Rosemary, et al.
Published: (1982)

Expert Systems in Reference Services.
by: Roysdon, Christine, Ed., et al.
Published: (1989)

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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