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<td width="100%"><h1>Understanding the Architecture of a Repository</h1></td>
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<p class="author">Author: Eike Stepper</p>
<p>
The main building block of a CDO repository is split into two layers, the generic repository layer that client
applications interact with and the database integration layer that providers can hook into to integrate their data
storage solutions with CDO. A number of such integrations already ship with CDO, making it possible to connect a
repository to all sorts of JDBC databases, Hibernate, Objectivity/DB, MongoDB or DB4O.
<p>
While technically a CDO repository depends on EMF this dependency is not of equal importance as it is in a CDO
application. In particular the generated application models are not required to be deployed to the server because a
CDO repository accesses models reflectively and the model objects are not implemented as <a href="http://download.eclipse.org/modeling/emf/emf/javadoc/2.7.0/org/eclipse/emf/ecore/EObject.html" title="Interface in org.eclipse.emf.ecore"><code>EObjects</code></a> on
the server.
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The following diagram illustrates the major building blocks of a CDO repository: <p align="center"><img src="repository-architecture.png"></p>
<h2><a name="OSGi"></a>1 OSGi</h2>
<h2><a name="Core"></a>2 CDO Server Core</h2>
<h2><a name="Store"></a>3 CDO Store</h2>
<h2><a name="OCL"></a>4 OCL</h2>
<h2><a name="Net4j"></a>5 Net4j</h2>
<h2><a name="Protocol"></a>6 Protocol</h2>
<h2><a name="Transport"></a>7 Transport</h2>
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<i>Copyright (c) 2004 - 2011 Eike Stepper (Berlin, Germany) and others.</i>
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