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<title>Class: ActiveRecord::ConnectionAdapters::ConnectionHandler</title>
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<td><strong>Class</strong></td>
<td class="class-name-in-header">ActiveRecord::ConnectionAdapters::ConnectionHandler</td>
</tr>
<tr class="top-aligned-row">
<td><strong>In:</strong></td>
<td>
<a href="../../../files/lib/active_record/connection_adapters/abstract/connection_pool_rb.html">
lib/active_record/connection_adapters/abstract/connection_pool.rb
</a>
<br />
</td>
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<td><strong>Parent:</strong></td>
<td>
Object
</td>
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<div id="description">
<p>
<a href="ConnectionHandler.html">ConnectionHandler</a> is a collection of
<a href="ConnectionPool.html">ConnectionPool</a> objects. It is used for
keeping separate connection pools for ActiveRecord models that connect to
different databases.
</p>
<p>
For example, suppose that you have 5 models, with the following hierarchy:
</p>
<pre>
|
+-- Book
| |
| +-- ScaryBook
| +-- GoodBook
+-- Author
+-- BankAccount
</pre>
<p>
Suppose that Book is to connect to a separate database (i.e. one other than
the default database). Then Book, ScaryBook and GoodBook will all use the
same connection pool. Likewise, Author and BankAccount will use the same
connection pool. However, the connection pool used by Author/BankAccount is
not the same as the one used by Book/ScaryBook/GoodBook.
</p>
<p>
Normally there is only a single <a
href="ConnectionHandler.html">ConnectionHandler</a> instance, accessible
via ActiveRecord::Base.connection_handler. ActiveRecord models use this to
determine that connection pool that they should use.
</p>
</div>
</div>
<div id="method-list">
<h3 class="section-bar">Methods</h3>
<div class="name-list">
<a href="#M000275">clear_active_connections!</a>
<a href="#M000277">clear_all_connections!</a>
<a href="#M000276">clear_reloadable_connections!</a>
<a href="#M000278">connected?</a>
<a href="#M000273">connection_pools</a>
<a href="#M000274">establish_connection</a>
<a href="#M000272">new</a>
<a href="#M000279">remove_connection</a>
<a href="#M000280">retrieve_connection_pool</a>
</div>
</div>
</div>
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<div id="methods">
<h3 class="section-bar">Public Class methods</h3>
<div id="method-M000272" class="method-detail">
<a name="M000272"></a>
<div class="method-heading">
<a href="ConnectionHandler.src/M000272.html" target="Code" class="method-signature"
onclick="popupCode('ConnectionHandler.src/M000272.html');return false;">
<span class="method-name">new</span><span class="method-args">(pools = {})</span>
</a>
</div>
<div class="method-description">
</div>
</div>
<h3 class="section-bar">Public Instance methods</h3>
<div id="method-M000275" class="method-detail">
<a name="M000275"></a>
<div class="method-heading">
<a href="ConnectionHandler.src/M000275.html" target="Code" class="method-signature"
onclick="popupCode('ConnectionHandler.src/M000275.html');return false;">
<span class="method-name">clear_active_connections!</span><span class="method-args">()</span>
</a>
</div>
<div class="method-description">
<p>
Returns any connections in use by the current thread back to the pool, and
also returns connections to the pool cached by threads that are no longer
alive.
</p>
</div>
</div>
<div id="method-M000277" class="method-detail">
<a name="M000277"></a>
<div class="method-heading">
<a href="ConnectionHandler.src/M000277.html" target="Code" class="method-signature"
onclick="popupCode('ConnectionHandler.src/M000277.html');return false;">
<span class="method-name">clear_all_connections!</span><span class="method-args">()</span>
</a>
</div>
<div class="method-description">
</div>
</div>
<div id="method-M000276" class="method-detail">
<a name="M000276"></a>
<div class="method-heading">
<a href="ConnectionHandler.src/M000276.html" target="Code" class="method-signature"
onclick="popupCode('ConnectionHandler.src/M000276.html');return false;">
<span class="method-name">clear_reloadable_connections!</span><span class="method-args">()</span>
</a>
</div>
<div class="method-description">
<p>
Clears the cache which maps classes
</p>
</div>
</div>
<div id="method-M000278" class="method-detail">
<a name="M000278"></a>
<div class="method-heading">
<a href="ConnectionHandler.src/M000278.html" target="Code" class="method-signature"
onclick="popupCode('ConnectionHandler.src/M000278.html');return false;">
<span class="method-name">connected?</span><span class="method-args">(klass)</span>
</a>
</div>
<div class="method-description">
<p>
Returns true if a connection that‘s accessible to this class has
already been opened.
</p>
</div>
</div>
<div id="method-M000273" class="method-detail">
<a name="M000273"></a>
<div class="method-heading">
<a href="ConnectionHandler.src/M000273.html" target="Code" class="method-signature"
onclick="popupCode('ConnectionHandler.src/M000273.html');return false;">
<span class="method-name">connection_pools</span><span class="method-args">()</span>
</a>
</div>
<div class="method-description">
</div>
</div>
<div id="method-M000274" class="method-detail">
<a name="M000274"></a>
<div class="method-heading">
<a href="ConnectionHandler.src/M000274.html" target="Code" class="method-signature"
onclick="popupCode('ConnectionHandler.src/M000274.html');return false;">
<span class="method-name">establish_connection</span><span class="method-args">(name, spec)</span>
</a>
</div>
<div class="method-description">
</div>
</div>
<div id="method-M000279" class="method-detail">
<a name="M000279"></a>
<div class="method-heading">
<a href="ConnectionHandler.src/M000279.html" target="Code" class="method-signature"
onclick="popupCode('ConnectionHandler.src/M000279.html');return false;">
<span class="method-name">remove_connection</span><span class="method-args">(klass)</span>
</a>
</div>
<div class="method-description">
<p>
Remove the connection for this class. This will close the active connection
and the defined connection (if they exist). The result can be used as an
argument for <a
href="ConnectionHandler.html#M000274">establish_connection</a>, for easily
re-establishing the connection.
</p>
</div>
</div>
<div id="method-M000280" class="method-detail">
<a name="M000280"></a>
<div class="method-heading">
<a href="ConnectionHandler.src/M000280.html" target="Code" class="method-signature"
onclick="popupCode('ConnectionHandler.src/M000280.html');return false;">
<span class="method-name">retrieve_connection_pool</span><span class="method-args">(klass)</span>
</a>
</div>
<div class="method-description">
</div>
</div>
</div>
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