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<?xml version="1.0" encoding="utf-8"?>
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<section id="Java-Broker-Concepts-Virtual-Hosts">
<title>Virtual Hosts</title>
<para>Broker comprises from one or many <emphasis>Virtual Hosts</emphasis>.
<emphasis>Virtual Host</emphasis> can be defined as a collection of exchanges, message queues and associated objects and
is an independent server domain that share a common authentication, encryption and transport environment.
</para>
<para>
The following diagram depicts the Virtual Host model:
<figure>
<title>Virtual Host Model</title>
<mediaobject>
<imageobject>
<imagedata fileref="images/VirtualHost-Model.png" format="PNG" scalefit="1"/>
</imageobject>
<textobject>
<phrase>Virtual Host Model</phrase>
</textobject>
</mediaobject>
</figure>
</para>
<para>Each <emphasis>Virtual Host</emphasis> has its own <emphasis>Message Store</emphasis>
which is used to store the persistent messages from all <link linkend="Java-Broker-Concepts-Queues">Queues</link>
declared on the <emphasis>Virtual Host</emphasis>.</para>
<para>
The following message stores are currently supported:
<itemizedlist>
<listitem><para><link linkend="Java-Broker-Stores-SQL-Store">JDBC Message Store</link></para></listitem>
<listitem><para><link linkend="Java-Broker-Stores-Derby-Store">Derby Message Store</link></para></listitem>
<listitem><para><link linkend="Java-Broker-Stores-BDB-Store">Berkeley DB Message Store</link></para></listitem>
<listitem><para><link linkend="Java-Broker-Stores-HA-BDB-Store">Berkeley DB HA Message Store</link></para></listitem>
<listitem><para><link linkend="Java-Broker-Stores-Memory-Store">Memory Message Store</link></para></listitem>
</itemizedlist>
</para>
<para>Virtual Hosts configuration is covered in <xref linkend="Java-Broker-Virtual-Hosts"/>.</para>
</section>
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