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| Table of Contents |
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| <ul class="sectlevel1 nav"> |
| <li><a href="/docs/5.0/cayenne-guide/object-relational-mapping-with-cayenne" class="nav-link" id="object-relational-mapping-with-cayenne">1. Object Relational Mapping with Cayenne</a> |
| <ul class="sectlevel2 nav"> |
| <li><a href="/docs/5.0/cayenne-guide/setup" class="nav-link" id="setup">1.1. Setup</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/cayenne-mapping-structure" class="nav-link" id="cayenne-mapping-structure">1.2. Cayenne Mapping Structure</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/cayenne-modeler" class="nav-link" id="cayenne-modeler">1.3. CayenneModeler Application</a></li> |
| </ul></li> |
| <li><a href="/docs/5.0/cayenne-guide/cayenne-framework" class="nav-link" id="cayenne-framework">2. Cayenne Framework</a> |
| <ul class="sectlevel2 nav"> |
| <li><a href="/docs/5.0/cayenne-guide/including-cayenne-in-project" class="nav-link" id="including-cayenne-in-project">2.1. Including Cayenne in a Project</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/starting-cayenne" class="nav-link" id="starting-cayenne">2.2. Starting Cayenne</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/persistent-objects-objectcontext" class="nav-link" id="persistent-objects-objectcontext">2.3. Persistent Objects and ObjectContext</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/expressions" class="nav-link" id="expressions">2.4. Expressions</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/orderings" class="nav-link" id="orderings">2.5. Orderings</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/queries" class="nav-link" id="queries">2.6. Queries</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/lifecycle-events" class="nav-link" id="lifecycle-events">2.7. Lifecycle Events</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/performance-tuning" class="nav-link" id="performance-tuning">2.8. Performance Tuning</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/customizing-cayenne-runtime" class="nav-link" id="customizing-cayenne-runtime">2.9. Customizing Cayenne Runtime</a></li> |
| </ul></li> |
| <li><a href="/docs/5.0/cayenne-guide/db-first-flow" class="nav-link" id="db-first-flow">3. DB-First Flow</a> |
| <ul class="sectlevel2 nav"> |
| <li><a href="/docs/5.0/cayenne-guide/re-introduction" class="nav-link" id="re-introduction">3.1. Introduction</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/re-filtering" class="nav-link" id="re-filtering">3.2. Filtering</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/re-relationships-loading-control" class="nav-link" id="re-relationships-loading-control">3.3. Other Settings</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/re-modeler" class="nav-link" id="re-modeler">3.4. Reverse Engineering in Cayenne Modeler</a></li> |
| </ul></li> |
| <li><a href="/docs/5.0/cayenne-guide/additional-modules" class="nav-link" id="additional-modules">4. Additional Modules</a> |
| <ul class="sectlevel2 nav"> |
| <li><a href="/docs/5.0/cayenne-guide/ext-cache-invalidation" class="nav-link" id="ext-cache-invalidation">4.1. Cache Invalidation Extension</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/ext-commit-log" class="nav-link" id="ext-commit-log">4.2. Commit log extension</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/ext-crypto" class="nav-link" id="ext-crypto">4.3. Crypto extension</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/ext-jcache" class="nav-link" id="ext-jcache">4.4. JCache integration</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/ext-project-compatibility" class="nav-link" id="ext-project-compatibility">4.5. Project compatibility extension</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/ext-velocity" class="nav-link" id="ext-velocity">4.6. Apache Velocity Extension</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/ext-osgi" class="nav-link" id="ext-osgi">4.7. Cayenne OSGI extension</a></li> |
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| <li><a href="/docs/5.0/cayenne-guide/maven_plugin" class="nav-link" id="maven_plugin">5.1. Maven Plugin</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/gradle_plugin" class="nav-link" id="gradle_plugin">5.2. Gradle Plugin</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/ant_tasks" class="nav-link" id="ant_tasks">5.3. Ant Tasks</a></li> |
| </ul></li> |
| <li><a href="/docs/5.0/cayenne-guide/appendix-a-configuration-properties" class="nav-link" id="appendix-a-configuration-properties">6. Appendix A. Configuration Properties</a></li> |
| <li><a href="/docs/5.0/cayenne-guide/appendix-b-service-collections" class="nav-link" id="appendix-b-service-collections">7. Appendix B. Service Collections</a></li> |
| </ul> |
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| <article> |
| <header> |
| </header> |
| <section> |
| <div class="sect2"> |
| <h3 id="starting-cayenne"><a class="anchor" href="#starting-cayenne"></a>2.2. Starting Cayenne</h3> |
| <div class="sect3"> |
| <h4 id="starting-and-stopping-cayenneruntime"><a class="anchor" href="#starting-and-stopping-cayenneruntime"></a>2.2.1. Starting and Stopping CayenneRuntime</h4> |
| <div class="paragraph"> |
| <p>In runtime Cayenne is accessed via <code>org.apache.cayenne.runtime.CayenneRuntime</code>. CayenneRuntime is created by calling a convenient builder:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java java" data-lang="java">CayenneRuntime runtime = CayenneRuntime.builder() |
| .addConfig("com/example/cayenne-project.xml") |
| .build();</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The parameter you pass to the builder is a location of the main project file. Location is a '/'-separated path (same path separator is used on UNIX and Windows) that is resolved relative to the application classpath. The project file can be placed in the root package or in a subpackage (e.g. in the code above it is in "com/example" subpackage).</p> |
| </div> |
| <div class="paragraph"> |
| <p>CayenneRuntime encapsulates a single Cayenne stack. Most applications will just have one CayenneRuntime using it to create as many ObjectContexts as needed, access the Dependency Injection (DI) container and work with other Cayenne features. Internally CayenneRuntime is just a thin wrapper around the DI container. Detailed features of the container are discussed in <a href="/docs/5.0/cayenne-guide/customizing-cayenne-runtime">Customizing Cayenne Runtime</a> chapter. Here we’ll just show an example of how an application might turn on external transactions:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java java" data-lang="java">Module extensions = binder -> |
| CoreModule.extend(binder).setProperty(Constants.EXTERNAL_TX_PROPERTY, "true"); |
| |
| CayenneRuntime runtime = CayenneRuntime.builder() |
| .addConfig("com/example/cayenne-project.xml") |
| .addModule(extensions) |
| .build();</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>It is a good idea to shut down the runtime when it is no longer needed, usually before the application itself is shutdown:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java java" data-lang="java">runtime.shutdown();</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>When a runtime object has the same scope as the application, this may not be always necessary, however in some cases it is essential, and is generally considered a good practice. E.g. in a web container hot redeploy of a webapp will cause resource leaks and eventual OutOfMemoryError if the application fails to shutdown CayenneRuntime.</p> |
| </div> |
| </div> |
| <div class="sect3"> |
| <h4 id="merging-multiple-projects"><a class="anchor" href="#merging-multiple-projects"></a>2.2.2. Merging Multiple Projects</h4> |
| <div class="paragraph"> |
| <p>CayenneRuntime requires at least one mapping project to run. But it can also take multiple projects and merge them together in a single configuration. This way different parts of a database can be mapped independently from each other (even by different software providers), and combined in runtime when assembling an application. Doing it is as easy as passing multiple project locations to CayenneRuntime builder:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java java" data-lang="java">CayenneRuntime runtime = CayenneRuntime.builder() |
| .addConfig("com/example/cayenne-project.xml") |
| .addConfig("org/foo/cayenne-library1.xml") |
| .addConfig("org/foo/cayenne-library2.xml") |
| .build();</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>When the projects are merged, the following rules are applied:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The order of projects matters during merge. If there are two conflicting metadata objects belonging to two projects, an object from the last project takes precedence over the object from the first one. This makes possible to override pieces of metadata. This is also similar to how DI modules are merged in Cayenne.</p></li> |
| <li> |
| <p>Runtime DataDomain name is set to the name of the last project in the list.</p></li> |
| <li> |
| <p>Runtime DataDomain properties are the same as the properties of the last project in the list. I.e. properties are not merged to avoid invalid combinations and unexpected runtime behavior.</p></li> |
| <li> |
| <p>If there are two or more DataMaps with the same name, only one DataMap is used in the merged project, the rest are discarded. Same precedence rules apply - DataMap from the project with the highest index in the project list overrides all other DataMaps with the same name.</p></li> |
| <li> |
| <p>If there are two or more DataNodes with the same name, only one DataNode is used in the merged project, the rest are discarded. DataNode coming from project with the highest index in the project list is chosen per precedence rule above.</p></li> |
| <li> |
| <p>There is a notion of "default" DataNode. After the merge if any DataMaps are not explicitly linked to DataNodes, their queries will be executed via a default DataNode. This makes it possible to build mapping "libraries" that are only associated with a specific database in runtime. If there’s only one DataNode in the merged project, it will be automatically chosen as default. A possible way to explicitly designate a specific node as default is to override <code>DataDomainProvider.createAndInitDataDomain()</code>.</p></li> |
| </ul> |
| </div> |
| </div> |
| <div class="sect3"> |
| <h4 id="web-applications"><a class="anchor" href="#web-applications"></a>2.2.3. Web Applications</h4> |
| <div class="paragraph"> |
| <p>Web applications can use a variety of mechanisms to configure and start the "services" they need, Cayenne being one of such services. Configuration can be done within standard servlet specification objects like Servlets, Filters, or ServletContextListeners, or can use Spring, JEE CDI, etc. This is a user’s architectural choice and Cayenne is agnostic to it and will happily work in any environment. As described above, all that is needed is to create an instance of CayenneRuntime somewhere and provide the application code with means to access it, and to shut it down when the application ends to avoid container leaks.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Still Cayenne includes a piece of web app configuration code that can assist in quickly setting up simple Cayenne-enabled web applications. We are talking about CayenneFilter. It is declared in web.xml:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-XML XML" data-lang="XML"><web-app> |
| ... |
| <filter> |
| <filter-name>cayenne-project</filter-name> |
| <filter-class>org.apache.cayenne.configuration.web.CayenneFilter</filter-class> |
| </filter> |
| <filter-mapping> |
| <filter-name>cayenne-project</filter-name> |
| <url-pattern>/*</url-pattern> |
| </filter-mapping> |
| ... |
| </web-app></code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>When started by the web container, it creates a instance of CayenneRuntime and stores it in the ServletContext. Note that the name of a Cayenne XML project file is derived from the "filter-name". In the example above, CayenneFilter will look for an XML file "cayenne-project.xml". This can be overridden with the "configuration-location" init parameter.</p> |
| </div> |
| <div class="paragraph"> |
| <p>When the application runs, all HTTP requests matching the filter url-pattern have access to a session-scoped ObjectContext like this:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java java" data-lang="java"> ObjectContext context = DataContext.getThreadObjectContext();</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Of course, the ObjectContext scope and other behavior of the Cayenne runtime can be customized via dependency injection. For this, another filter init parameter called "extra-modules" is used. "extra-modules" is a comma- or space-separated list of class names, with each class implementing Module interface. These optional custom modules are loaded after the the standard ones, which allows users to override all standard definitions.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For those interested in the DI container contents of the runtime created by CayenneFilter, it is the same CayenneRuntime as would have been created by other means, but with an extra <code>org.apache.cayenne.configuration.web.WebModule</code> module that provides the <code>org.apache.cayenne.configuration.web.RequestHandler</code> service. This is the service to override in the custom modules if you need to provide a different ObjectContext scope, etc.</p> |
| </div> |
| <div class="admonitionblock note"> |
| <table> |
| <tbody> |
| <tr> |
| <td class="icon"><i class="fa fa-info-circle fa-2x" title="Note"></i></td> |
| <td class="content">You should not think of CayenneFilter as the only way to start and use Cayenne in a web application. In fact, CayenneFilter is entirely optional. Use it if you don’t have any special design for application service management. If you do, simply integrate Cayenne into that design.</td> |
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| <time datetime="2023-05-25 18:00:00 +0300 +0300" class="xsmall d-block">May 25, 2023</time> |
| <a href="/2023/05/cayenne-42-final-released/">Cayenne 4.2 Final Released</a> |
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| |
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| <time datetime="2023-03-02 12:00:00 +0300 +0300" class="xsmall d-block">Mar 02, 2023</time> |
| <a href="/2023/03/cayenne-403-released/">Cayenne 4.0.3 Released</a> |
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| |
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| <time datetime="2022-12-05 12:00:00 +0300 +0300" class="xsmall d-block">Dec 05, 2022</time> |
| <a href="/2022/12/cayenne-42rc2-released/">Cayenne 4.2 Release Candidate 2 Released</a> |
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