Reloader.html

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<title>class Rack::Reloader - rack-2.2.23 Documentation</title>

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  <h3>Parent</h3>

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  <h3>Methods</h3>

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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>

</section>

<section id="public-class-5Buntitled-5D-method-details" class="method-section">
       <header>
         <h3>Public Class Methods</h3>
       </header>

<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>
          
          <span class="method-click-advice">click to toggle source</span>
          
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<div class="method-source-code" id="new-source">
            <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>
          </div>
          
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</section>
  
     <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>
          
          <span class="method-click-advice">click to toggle source</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">&gt;</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">&gt;</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>

</div>

<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>
          
          <span class="method-click-advice">click to toggle source</span>
          
        </div>

<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">&gt;</span> <span class="ruby-identifier">previous_mtime</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div>
          
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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>
          
          <span class="method-click-advice">click to toggle source</span>
          
        </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">&quot;#{self.class}: reloaded `#{file}&#39;&quot;</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">=&gt;</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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