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<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % BOOK_ENTITIES SYSTEM "ActiveMQ_User_Manual.ent">
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%BOOK_ENTITIES;
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]>
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<chapter id="preface">
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<title>Preface</title>
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<para>What is ActiveMQ?</para>
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<itemizedlist>
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<listitem>
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<para>ActiveMQ is an open source project to build a multi-protocol, embeddable, very high
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performance, clustered, asynchronous messaging system.</para>
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</listitem>
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<listitem>
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<para>ActiveMQ is an example of Message Oriented Middleware (MoM). For a description of
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MoMs and other messaging concepts please see the <xref linkend="messaging-concepts"
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/>.</para>
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</listitem>
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<listitem>
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<para>For answers to more questions about what ActiveMQ is and what it isn't please visit
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the <ulink url="http://www.jboss.org/community/wiki/ActiveMQGeneralFAQs">FAQs wiki
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page</ulink>.</para>
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</listitem>
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</itemizedlist>
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<para>Why use ActiveMQ? Here are just a few of the reasons:</para>
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<itemizedlist>
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<listitem>
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<para>100% open source software. ActiveMQ is licensed using the Apache Software License v
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2.0 to minimise barriers to adoption.</para>
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</listitem>
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<listitem>
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<para>ActiveMQ is designed with usability in mind.</para>
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</listitem>
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<listitem>
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<para>Written in Java. Runs on any platform with a Java 6+ runtime, that's everything
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from Windows desktops to IBM mainframes.</para>
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</listitem>
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<listitem>
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<para>Amazing performance. Our ground-breaking high performance journal provides
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persistent messaging performance at rates normally seen for non-persistent
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messaging, our non-persistent messaging performance rocks the boat too.</para>
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</listitem>
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<listitem>
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<para>Full feature set. All the features you'd expect in any serious messaging system,
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and others you won't find anywhere else.</para>
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</listitem>
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<listitem>
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<para>Elegant, clean-cut design with minimal third party dependencies. Run ActiveMQ
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stand-alone, run it in integrated in your favourite JEE application server, or run
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it embedded inside your own product. It's up to you.</para>
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</listitem>
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<listitem>
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<para>Seamless high availability. We provide a HA solution with automatic client
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failover so you can guarantee zero message loss or duplication in event of server
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failure.</para>
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</listitem>
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<listitem>
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<para>Hugely flexible clustering. Create clusters of servers that know how to load
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balance messages. Link geographically distributed clusters over unreliable
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connections to form a global network. Configure routing of messages in a highly
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flexible way.</para>
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</listitem>
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<listitem>
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<para>For a full list of features, please see the <ulink
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url="http://www.jboss.org/community/wiki/ActiveMQFeatures">features wiki
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page</ulink> .</para>
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</listitem>
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</itemizedlist>
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</chapter>
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