File: Poco.ExpireCache.html

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>Class Poco::ExpireCache</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<meta name="author" content="Applied Informatics Software Engineering GmbH and Contributors"/>
<meta name="publisher" content="Applied Informatics Software Engineering GmbH and Contributors"/>
<meta name="copyright" content="Copyright (c) 2009, Applied Informatics Software Engineering GmbH and Contributors"/>
<meta name="language" content="en"/>
<meta name="date" content="2009-11-24"/>
<meta name="generator" content="PocoDoc"/>
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<div class="header">
<h1 class="namespace"><a href="Poco.html" class="namespace">Poco</a></h1>
<h1 class="template">template &lt; class TKey, class TValue &gt;</h1>
<h1 class="symbol">class ExpireCache</h1>
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<p>
<b>Library:</b> Foundation<br />
<b>Package:</b> Cache<br />
<b>Header:</b> Poco/ExpireCache.h</p>
<h2>Description</h2>
<div class="description">
<p>An <a href="Poco.ExpireCache.html" title="class Poco::ExpireCache">ExpireCache</a> caches entries for a fixed time period (per default 10 minutes). Entries expire independently of the access pattern, i.e. after a constant time. If you require your objects to expire after they were not accessed for a given time period use a <a href="Poco.AccessExpireCache.html" title="class Poco::AccessExpireCache">Poco::AccessExpireCache</a>. </p>
<p>Be careful when using an <a href="Poco.ExpireCache.html" title="class Poco::ExpireCache">ExpireCache</a>. A cache is often used like cache.has(x) followed by cache.get x). Note that it could happen that the &quot;has&quot; call works, then the current execution thread gets descheduled, time passes, the entry gets invalid, thus leading to an empty <a href="Poco.SharedPtr.html" title="class Poco::SharedPtr">SharedPtr</a> being returned  when &quot;get&quot; is invoked. </p>
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<h2>Inheritance</h2>
<p><b>Direct Base Classes: </b>AbstractCache&nbsp;&lt;&nbsp;TKey,&nbsp;TValue,&nbsp;ExpireStrategy&nbsp;&lt;&nbsp;TKey,&nbsp;TValue&nbsp;&gt;&nbsp;&gt;</p>
<p><b>All Base Classes: </b>AbstractCache&nbsp;&lt;&nbsp;TKey,&nbsp;TValue,&nbsp;ExpireStrategy&nbsp;&lt;&nbsp;TKey,&nbsp;TValue&nbsp;&gt;&nbsp;&gt;</p>
<h2>Constructors</h2>
<h3><a name="6777">ExpireCache</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl"><a href="Poco.ExpireCache.html" title="class Poco::ExpireCache">ExpireCache</a>(<br />&nbsp;&nbsp;&nbsp;&nbsp;<a href="Poco.Timestamp.html#11151" title="Poco::Timestamp::TimeDiff">Timestamp::TimeDiff</a> expire = 600000<br />);</p>
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<p></p>
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<h2>Destructor</h2>
<h3><a name="6779">~ExpireCache</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">~<a href="Poco.ExpireCache.html" title="class Poco::ExpireCache">ExpireCache</a>();</p>
<div class="description">
<p></p>
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<p class="footer">POCO C++ Libraries 1.3.6-all<br />
Copyright &copy; 2009, <a href="http://pocoproject.org/" target="_blank">Applied Informatics Software Engineering GmbH and Contributors</a></p>

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