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<title>class Rack::Session::Pool - rack-2.2.8 Documentation</title>
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<h3>Parent</h3>
<p class="link"><a href="Abstract/PersistedSecure.html">Rack::Session::Abstract::PersistedSecure</a>
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<!-- Method Quickref -->
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<h3>Methods</h3>
<ul class="link-list" role="directory">
<li class="calls-super" ><a href="#method-c-new">::new</a>
<li ><a href="#method-i-delete_session">#delete_session</a>
<li ><a href="#method-i-find_session">#find_session</a>
<li class="calls-super" ><a href="#method-i-generate_sid">#generate_sid</a>
<li ><a href="#method-i-get_session_with_fallback">#get_session_with_fallback</a>
<li ><a href="#method-i-with_lock">#with_lock</a>
<li ><a href="#method-i-write_session">#write_session</a>
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<main role="main" aria-labelledby="class-Rack::Session::Pool">
<h1 id="class-Rack::Session::Pool" class="class">
class Rack::Session::Pool
</h1>
<section class="description">
<p><a href="Pool.html"><code>Rack::Session::Pool</code></a> provides simple cookie based session management. <a href="../Session.html"><code>Session</code></a> data is stored in a hash held by @pool. In the context of a multithreaded environment, sessions being committed to the pool is done in a merging manner.</p>
<p>The :drop option is available in rack.session.options if you wish to explicitly remove the session from the session cache.</p>
<p>Example:</p>
<pre class="ruby"><span class="ruby-identifier">myapp</span> = <span class="ruby-constant">MyRackApp</span>.<span class="ruby-identifier">new</span>
<span class="ruby-identifier">sessioned</span> = <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Session</span><span class="ruby-operator">::</span><span class="ruby-constant">Pool</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">myapp</span>,
<span class="ruby-value">:domain</span> <span class="ruby-operator">=></span> <span class="ruby-string">'foo.com'</span>,
<span class="ruby-value">:expire_after</span> <span class="ruby-operator">=></span> <span class="ruby-value">2592000</span>
)
<span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Handler</span><span class="ruby-operator">::</span><span class="ruby-constant">WEBrick</span>.<span class="ruby-identifier">run</span> <span class="ruby-identifier">sessioned</span>
</pre>
</section>
<section id="5Buntitled-5D" class="documentation-section">
<section class="constants-list">
<header>
<h3>Constants</h3>
</header>
<dl>
<dt id="DEFAULT_OPTIONS">DEFAULT_OPTIONS
<dd>
</dl>
</section>
<section class="attribute-method-details" class="method-section">
<header>
<h3>Attributes</h3>
</header>
<div id="attribute-i-mutex" class="method-detail">
<div class="method-heading attribute-method-heading">
<span class="method-name">mutex</span><span
class="attribute-access-type">[R]</span>
</div>
<div class="method-description">
</div>
</div>
<div id="attribute-i-pool" class="method-detail">
<div class="method-heading attribute-method-heading">
<span class="method-name">pool</span><span
class="attribute-access-type">[R]</span>
</div>
<div class="method-description">
</div>
</div>
</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, options = {})</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<div class="method-calls-super">
Calls superclass method
<a href="Abstract/Persisted.html#method-c-new"><code>Rack::Session::Abstract::Persisted::new</code></a>
</div>
<div class="method-source-code" id="new-source">
<pre><span class="ruby-comment"># File lib/rack/session/pool.rb, line 33</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">options</span> = {})
<span class="ruby-keyword">super</span>
<span class="ruby-ivar">@pool</span> = <span class="ruby-constant">Hash</span>.<span class="ruby-identifier">new</span>
<span class="ruby-ivar">@mutex</span> = <span class="ruby-constant">Mutex</span>.<span class="ruby-identifier">new</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
</section>
<section id="public-instance-5Buntitled-5D-method-details" class="method-section">
<header>
<h3>Public Instance Methods</h3>
</header>
<div id="method-i-delete_session" class="method-detail ">
<div class="method-heading">
<span class="method-name">delete_session</span><span
class="method-args">(req, session_id, options)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<div class="method-source-code" id="delete_session-source">
<pre><span class="ruby-comment"># File lib/rack/session/pool.rb, line 63</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">delete_session</span>(<span class="ruby-identifier">req</span>, <span class="ruby-identifier">session_id</span>, <span class="ruby-identifier">options</span>)
<span class="ruby-identifier">with_lock</span>(<span class="ruby-identifier">req</span>) <span class="ruby-keyword">do</span>
<span class="ruby-ivar">@pool</span>.<span class="ruby-identifier">delete</span>(<span class="ruby-identifier">session_id</span>.<span class="ruby-identifier">public_id</span>)
<span class="ruby-ivar">@pool</span>.<span class="ruby-identifier">delete</span>(<span class="ruby-identifier">session_id</span>.<span class="ruby-identifier">private_id</span>)
<span class="ruby-identifier">generate_sid</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:drop</span>]
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-i-find_session" class="method-detail ">
<div class="method-heading">
<span class="method-name">find_session</span><span
class="method-args">(req, sid)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<div class="method-source-code" id="find_session-source">
<pre><span class="ruby-comment"># File lib/rack/session/pool.rb, line 46</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">find_session</span>(<span class="ruby-identifier">req</span>, <span class="ruby-identifier">sid</span>)
<span class="ruby-identifier">with_lock</span>(<span class="ruby-identifier">req</span>) <span class="ruby-keyword">do</span>
<span class="ruby-keyword">unless</span> <span class="ruby-identifier">sid</span> <span class="ruby-keyword">and</span> <span class="ruby-identifier">session</span> = <span class="ruby-identifier">get_session_with_fallback</span>(<span class="ruby-identifier">sid</span>)
<span class="ruby-identifier">sid</span>, <span class="ruby-identifier">session</span> = <span class="ruby-identifier">generate_sid</span>, {}
<span class="ruby-ivar">@pool</span>.<span class="ruby-identifier">store</span> <span class="ruby-identifier">sid</span>.<span class="ruby-identifier">private_id</span>, <span class="ruby-identifier">session</span>
<span class="ruby-keyword">end</span>
[<span class="ruby-identifier">sid</span>, <span class="ruby-identifier">session</span>]
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-i-generate_sid" class="method-detail ">
<div class="method-heading">
<span class="method-name">generate_sid</span><span
class="method-args">()</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<div class="method-calls-super">
Calls superclass method
<a href="Abstract/PersistedSecure.html#method-i-generate_sid"><code>Rack::Session::Abstract::PersistedSecure#generate_sid</code></a>
</div>
<div class="method-source-code" id="generate_sid-source">
<pre><span class="ruby-comment"># File lib/rack/session/pool.rb, line 39</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">generate_sid</span>
<span class="ruby-identifier">loop</span> <span class="ruby-keyword">do</span>
<span class="ruby-identifier">sid</span> = <span class="ruby-keyword">super</span>
<span class="ruby-keyword">break</span> <span class="ruby-identifier">sid</span> <span class="ruby-keyword">unless</span> <span class="ruby-ivar">@pool</span>.<span class="ruby-identifier">key?</span> <span class="ruby-identifier">sid</span>.<span class="ruby-identifier">private_id</span>
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-i-with_lock" class="method-detail ">
<div class="method-heading">
<span class="method-name">with_lock</span><span
class="method-args">(req) { || ... }</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<div class="method-source-code" id="with_lock-source">
<pre><span class="ruby-comment"># File lib/rack/session/pool.rb, line 71</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">with_lock</span>(<span class="ruby-identifier">req</span>)
<span class="ruby-ivar">@mutex</span>.<span class="ruby-identifier">lock</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">req</span>.<span class="ruby-identifier">multithread?</span>
<span class="ruby-keyword">yield</span>
<span class="ruby-keyword">ensure</span>
<span class="ruby-ivar">@mutex</span>.<span class="ruby-identifier">unlock</span> <span class="ruby-keyword">if</span> <span class="ruby-ivar">@mutex</span>.<span class="ruby-identifier">locked?</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-i-write_session" class="method-detail ">
<div class="method-heading">
<span class="method-name">write_session</span><span
class="method-args">(req, session_id, new_session, options)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<div class="method-source-code" id="write_session-source">
<pre><span class="ruby-comment"># File lib/rack/session/pool.rb, line 56</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">write_session</span>(<span class="ruby-identifier">req</span>, <span class="ruby-identifier">session_id</span>, <span class="ruby-identifier">new_session</span>, <span class="ruby-identifier">options</span>)
<span class="ruby-identifier">with_lock</span>(<span class="ruby-identifier">req</span>) <span class="ruby-keyword">do</span>
<span class="ruby-ivar">@pool</span>.<span class="ruby-identifier">store</span> <span class="ruby-identifier">session_id</span>.<span class="ruby-identifier">private_id</span>, <span class="ruby-identifier">new_session</span>
<span class="ruby-identifier">session_id</span>
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
</section>
<section id="private-instance-5Buntitled-5D-method-details" class="method-section">
<header>
<h3>Private Instance Methods</h3>
</header>
<div id="method-i-get_session_with_fallback" class="method-detail ">
<div class="method-heading">
<span class="method-name">get_session_with_fallback</span><span
class="method-args">(sid)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<div class="method-source-code" id="get_session_with_fallback-source">
<pre><span class="ruby-comment"># File lib/rack/session/pool.rb, line 80</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">get_session_with_fallback</span>(<span class="ruby-identifier">sid</span>)
<span class="ruby-ivar">@pool</span>[<span class="ruby-identifier">sid</span>.<span class="ruby-identifier">private_id</span>] <span class="ruby-operator">||</span> <span class="ruby-ivar">@pool</span>[<span class="ruby-identifier">sid</span>.<span class="ruby-identifier">public_id</span>]
<span class="ruby-keyword">end</span></pre>
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