Digital Image Collections: Issues and Practice.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Author:	Ester, Michael
Format:	Recurso educativo Open Access
Language:	en
Published:	1996
Subjects:	Access to Information Archives Electronic Publishing Electronic Text Futures (of Society) Information Storage Library Collections Microfilm Nonprint Media Preservation Printed Materials Reprography
Online Access:	Acceder al recurso
Tags:	Add Tag No Tags, Be the first to tag this record!

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Microfilming in the Helsinki University Library.
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Access--Forget about Ownership.
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"'Why Do We Need to Keep This in Print? It's on the Web ...': A Review of Electronic Archiving Issues and Problems."
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Risk Management of Digital Information: A File Format Investigation.
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Scholarly Materials: Paper or Digital?
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On-site and Off-site Collections: Costs and Challenges.
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Publishers' Views of Electronic Short-Loan Collections and Copyright Clearance Issues.
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Electronic Publications at National Libraries: Now and in the Future.
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Digital Archiving and Preservation: Technologies and Processes for a Trusted Repository
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The Last Book: The Delivery of Future Content.
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Hybridity, Mutability, Multiplicity: Theorizing Electronic Library Collections.
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The Photostat-Microfilm War at the New York Public Library in the 1930s, the 1940s, and the 1950s.
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On Your Mark, Get Set, Go! Overview of a Digital Project from Start to Finish
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Why Microfilm Research-Library Collections When Electronic Data Bases Could Be Used?
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Long-Term Retention of Electronic Theses and Dissertations.
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Electronic Reference Works and Library Budgeting Dilemma
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The Idea of Order: Transforming Research Collections for 21st Century Scholarship. CLIR Publication No. 147
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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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