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| <h1 id="integrators-guide">Integrators guide<a class="headerlink" href="#integrators-guide" title="Permanent link">¶</a></h1> |
| <p>This page describes things that should be considered when integrating the |
| Apache Aries project into a runtime.</p> |
| <p><a name="IntegratorsGuide-InstallingApplications"></a></p> |
| <h2 id="installing-applications">Installing Applications<a class="headerlink" href="#installing-applications" title="Permanent link">¶</a></h2> |
| <p>An application is installed using the AriesApplicationManager service. A |
| client looks up the AriesApplicationManager and calls one of the |
| createApplication methods. There are two createApplication methods. The |
| first takes a URL that identifies the application. When this is called the |
| application is archive is downloaded from the specified URL and stored in a |
| temporary location. The second takes an IDirectory. The application utils |
| project contains two implementations of IDirectory, one that maps onto |
| directories and the other maps onto a zip. This method creates applications |
| with no downloads. The createApplication method will attempt to convert non |
| bundle content into bundles and will resolve the application in order to |
| find all the dependencies. This does not affect the original application. |
| To get a converted, resolved application the returned AriesApplication can |
| be stored elsewhere. Storing the AriesApplication will store an application |
| archive.</p> |
| <p>Once the AriesApplication has been created it can be installed into a |
| framework using the install method of the AriesApplicationManager. The |
| install method returns an ApplicationContext which represents the runtime |
| state of the application.</p> |
| <p><a name="IntegratorsGuide-StartingandStoppinganApplication"></a></p> |
| <h2 id="starting-and-stopping-an-application">Starting and Stopping an Application<a class="headerlink" href="#starting-and-stopping-an-application" title="Permanent link">¶</a></h2> |
| <p>The application can be started and stopped by calling the start and stop |
| methods on the ApplicationContext.</p> |
| <p><a name="IntegratorsGuide-UninstallinganApplication"></a></p> |
| <h2 id="uninstalling-an-application">Uninstalling an Application<a class="headerlink" href="#uninstalling-an-application" title="Permanent link">¶</a></h2> |
| <p>The application can be uninstalled by passing the ApplicationContext to the |
| uninstall method on the AriesApplicationManager.</p> |
| <p><a name="IntegratorsGuide-FelixFileInstall"></a></p> |
| <h2 id="felix-fileinstall">Felix FileInstall<a class="headerlink" href="#felix-fileinstall" title="Permanent link">¶</a></h2> |
| <p>The aries application project contains an example application installer |
| that hooks into the felix file install project. It automatically installs |
| and uninstalls .eba archives found by FileInstall.</p> |
| <p><a name="IntegratorsGuide-BundleConverters"></a></p> |
| <h2 id="bundleconverters">BundleConverters<a class="headerlink" href="#bundleconverters" title="Permanent link">¶</a></h2> |
| <p>A BundleConverter is a service that can convert an artefact into an OSGi |
| Bundle. The interface is provided an IFile indicating the artefact in the |
| application and an IDirectory for the root of the aries application. If the |
| artefact can be converted then an InputStream is returned that contains the |
| bytes for the bundle.</p> |
| <p>The Aries application project contains a converter for turning war files |
| into web application bundles.</p> |
| <p><a name="IntegratorsGuide-AriesApplicationResolvers"></a></p> |
| <h2 id="ariesapplicationresolvers">AriesApplicationResolvers<a class="headerlink" href="#ariesapplicationresolvers" title="Permanent link">¶</a></h2> |
| <p>The Application-Content header in the application does not denote the full |
| content of the application. When the application is created the runtime |
| will use an AriesApplicationResolver service to work out what extra bundles |
| are needed to run the application.</p> |
| <p>The aries project contains two resolvers:</p> |
| <ol> |
| <li>The NoOpResolver. This resolver assumes that all the required bundles are |
| contained by value in the application and simply returns the information |
| about the bundles in the application.</li> |
| <li>The OBRAriesResolver. This resolver makes use of OBR to resolve the |
| applications</li> |
| </ol> |
| <p>The AriesApplicationManager service picks up any resolver in the service |
| registry, so alternatives can be provided if the default resolvers do not |
| provide the desired behaviour.</p> |
| <p><a name="IntegratorsGuide-ApplicationContextManagers"></a></p> |
| <h2 id="applicationcontextmanagers">ApplicationContextManagers<a class="headerlink" href="#applicationcontextmanagers" title="Permanent link">¶</a></h2> |
| <p>The AriesApplicationManager does not itself know how to put an application |
| into an OSGi framework. To do this it calls out to an |
| ApplicationContextManager. </p> |
| <p>The aries project contains a single simple application context manager |
| which installs the application into a flat framework. This does not provide |
| the isolation expected for the application content and is provided as a |
| simple sample.</p></div> |
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