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<a href="#toc0">Overview</a>
<div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.singleton/global-singleton">global-singleton</a>
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<a href="#clojure.contrib.singleton/per-thread-singleton">per-thread-singleton</a>
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<div id="content-tag"><h1 id="overview">API for <span id="namespace-name">singleton</span>
- <span id="header-project">clojure-contrib</span> <span id="header-version">v1.2</span> (<span id="header-status">beta 1</span>)
</h1>
<span id="author-line">by <span id="author-name">Stuart Sierra</span><br /></span>
<br />Usage:
<pre>
(ns your-namespace
(:require <span id="long-name">clojure.contrib.singleton</span>))
</pre><pre>
</pre><h2>Overview</h2>
<pre id="namespace-docstr">Singleton functions</pre>
<br />
<h2>Public Variables and Functions</h2>
<div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.singleton/global-singleton">global-singleton</h2>
<span id="var-type">function</span><br />
<pre id="var-usage">Usage: (global-singleton f)
</pre>
<pre id="var-docstr">Returns a global singleton function. f is a function of no
arguments that creates and returns some object. The singleton
function will call f just once, the first time it is needed, and
cache the value for all subsequent calls.
Warning: global singletons are often unsafe in multi-threaded code.
Consider per-thread-singleton instead.</pre>
<a href="http://github.com/clojure/clojure-contrib/blob/b8d2743d3a89e13fc9deb2844ca2167b34aaa9b6/src/main/clojure/clojure/contrib/singleton.clj#L28" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.singleton/per-thread-singleton">per-thread-singleton</h2>
<span id="var-type">function</span><br />
<pre id="var-usage">Usage: (per-thread-singleton f)
</pre>
<pre id="var-docstr">Returns a per-thread singleton function. f is a function of no
arguments that creates and returns some object. The singleton
function will call f only once for each thread, and cache its value
for subsequent calls from the same thread. This allows you to
safely and lazily initialize shared objects on a per-thread basis.
Warning: due to a bug in JDK 5, it may not be safe to use a
per-thread-singleton in the initialization function for another
per-thread-singleton. See
<a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5025230">http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5025230</a></pre>
<a href="http://github.com/clojure/clojure-contrib/blob/b8d2743d3a89e13fc9deb2844ca2167b34aaa9b6/src/main/clojure/clojure/contrib/singleton.clj#L41" id="var-source">Source</a>
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