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<title>class Rack::Reloader - rack-2.2.8 Documentation</title>
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<li ><a href="#method-c-new">::new</a>
<li ><a href="#method-i-call">#call</a>
<li ><a href="#method-i-reload-21">#reload!</a>
<li ><a href="#method-i-safe_load">#safe_load</a>
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<h1 id="class-Rack::Reloader" class="class">
class Rack::Reloader
</h1>
<section class="description">
<p>High performant source reloader</p>
<p>This class acts as <a href="../Rack.html"><code>Rack</code></a> middleware.</p>
<p>What makes it especially suited for use in a production environment is that any file will only be checked once and there will only be made one system call stat(2).</p>
<p>Please note that this will not reload files in the background, it does so only when actively called.</p>
<p>It is performing a check/reload cycle at the start of every request, but also respects a cool down time, during which nothing will be done.</p>
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<h3>Public Class Methods</h3>
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<div id="method-c-new" class="method-detail ">
<div class="method-heading">
<span class="method-name">new</span><span
class="method-args">(app, cooldown = 10, backend = Stat)</span>
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<pre><span class="ruby-comment"># File lib/rack/reloader.rb, line 27</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-identifier">app</span>, <span class="ruby-identifier">cooldown</span> = <span class="ruby-value">10</span>, <span class="ruby-identifier">backend</span> = <span class="ruby-constant">Stat</span>)
<span class="ruby-ivar">@app</span> = <span class="ruby-identifier">app</span>
<span class="ruby-ivar">@cooldown</span> = <span class="ruby-identifier">cooldown</span>
<span class="ruby-ivar">@last</span> = (<span class="ruby-constant">Time</span>.<span class="ruby-identifier">now</span> <span class="ruby-operator">-</span> <span class="ruby-identifier">cooldown</span>)
<span class="ruby-ivar">@cache</span> = {}
<span class="ruby-ivar">@mtimes</span> = {}
<span class="ruby-ivar">@reload_mutex</span> = <span class="ruby-constant">Mutex</span>.<span class="ruby-identifier">new</span>
<span class="ruby-identifier">extend</span> <span class="ruby-identifier">backend</span>
<span class="ruby-keyword">end</span></pre>
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<section id="public-instance-5Buntitled-5D-method-details" class="method-section">
<header>
<h3>Public Instance Methods</h3>
</header>
<div id="method-i-call" class="method-detail ">
<div class="method-heading">
<span class="method-name">call</span><span
class="method-args">(env)</span>
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<div class="method-source-code" id="call-source">
<pre><span class="ruby-comment"># File lib/rack/reloader.rb, line 38</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">call</span>(<span class="ruby-identifier">env</span>)
<span class="ruby-keyword">if</span> <span class="ruby-ivar">@cooldown</span> <span class="ruby-keyword">and</span> <span class="ruby-constant">Time</span>.<span class="ruby-identifier">now</span> <span class="ruby-operator">></span> <span class="ruby-ivar">@last</span> <span class="ruby-operator">+</span> <span class="ruby-ivar">@cooldown</span>
<span class="ruby-keyword">if</span> <span class="ruby-constant">Thread</span>.<span class="ruby-identifier">list</span>.<span class="ruby-identifier">size</span> <span class="ruby-operator">></span> <span class="ruby-value">1</span>
<span class="ruby-ivar">@reload_mutex</span>.<span class="ruby-identifier">synchronize</span>{ <span class="ruby-identifier">reload!</span> }
<span class="ruby-keyword">else</span>
<span class="ruby-identifier">reload!</span>
<span class="ruby-keyword">end</span>
<span class="ruby-ivar">@last</span> = <span class="ruby-constant">Time</span>.<span class="ruby-identifier">now</span>
<span class="ruby-keyword">end</span>
<span class="ruby-ivar">@app</span>.<span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
<span class="ruby-keyword">end</span></pre>
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<div id="method-i-reload-21" class="method-detail ">
<div class="method-heading">
<span class="method-name">reload!</span><span
class="method-args">(stderr = $stderr)</span>
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<div class="method-description">
<div class="method-source-code" id="reload-21-source">
<pre><span class="ruby-comment"># File lib/rack/reloader.rb, line 52</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">reload!</span>(<span class="ruby-identifier">stderr</span> = <span class="ruby-identifier">$stderr</span>)
<span class="ruby-identifier">rotation</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">file</span>, <span class="ruby-identifier">mtime</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">previous_mtime</span> = <span class="ruby-ivar">@mtimes</span>[<span class="ruby-identifier">file</span>] <span class="ruby-operator">||=</span> <span class="ruby-identifier">mtime</span>
<span class="ruby-identifier">safe_load</span>(<span class="ruby-identifier">file</span>, <span class="ruby-identifier">mtime</span>, <span class="ruby-identifier">stderr</span>) <span class="ruby-keyword">if</span> <span class="ruby-identifier">mtime</span> <span class="ruby-operator">></span> <span class="ruby-identifier">previous_mtime</span>
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
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<div id="method-i-safe_load" class="method-detail ">
<div class="method-heading">
<span class="method-name">safe_load</span><span
class="method-args">(file, mtime, stderr = $stderr)</span>
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</div>
<div class="method-description">
<p>A safe Kernel::load, issuing the hooks depending on the results</p>
<div class="method-source-code" id="safe_load-source">
<pre><span class="ruby-comment"># File lib/rack/reloader.rb, line 60</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">safe_load</span>(<span class="ruby-identifier">file</span>, <span class="ruby-identifier">mtime</span>, <span class="ruby-identifier">stderr</span> = <span class="ruby-identifier">$stderr</span>)
<span class="ruby-identifier">load</span>(<span class="ruby-identifier">file</span>)
<span class="ruby-identifier">stderr</span>.<span class="ruby-identifier">puts</span> <span class="ruby-node">"#{self.class}: reloaded `#{file}'"</span>
<span class="ruby-identifier">file</span>
<span class="ruby-keyword">rescue</span> <span class="ruby-constant">LoadError</span>, <span class="ruby-constant">SyntaxError</span> <span class="ruby-operator">=></span> <span class="ruby-identifier">ex</span>
<span class="ruby-identifier">stderr</span>.<span class="ruby-identifier">puts</span> <span class="ruby-identifier">ex</span>
<span class="ruby-keyword">ensure</span>
<span class="ruby-ivar">@mtimes</span>[<span class="ruby-identifier">file</span>] = <span class="ruby-identifier">mtime</span>
<span class="ruby-keyword">end</span></pre>
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