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| <h1 class="firstHeading">SMILA/Project Concepts/OSGi service groupping (service registry concept)</h1> |
| <div id="bodyContent"> |
| <h3 id="siteSub">From Eclipsepedia</h3> |
| <div id="contentSub"><span class="subpages">< <a href="../../SMILA.html" title="SMILA">SMILA</a> | <a href="../Project_Concepts.1.html" title="SMILA/Project Concepts">Project Concepts</a></span></div> |
| <div id="jump-to-nav">Jump to: <a href="OSGi_service_groupping_(service_registry_concept).html#column-one">navigation</a>, <a href="OSGi_service_groupping_(service_registry_concept).html#searchInput">search</a></div> <!-- start content --> |
| <a name="Description"></a><h2> <span class="mw-headline"> Description </span></h2> |
| <p><b>THIS PAGE SHOULD BE REMOVED - concept is obsolete</b> |
| </p><p>A concept of service registry for groupping services |
| </p> |
| <a name="Discussion"></a><h2> <span class="mw-headline"> Discussion </span></h2> |
| <p><a href="http://wiki.eclipse.org/User:Juergen.schumacher.empolis.com" title="User:Juergen.schumacher.empolis.com">Juergen Schumacher</a>: |
| I have some questions about this: I think we should go for OSGi's Declarative Se... I have some questions about this: |
| </p><p>I think we should go for OSGi's Declarative Services feature for managing service registrations and dependencies. Simple examples for service registration can be found in [<a href="http://www.eclipsezone.com/eclipse/forums/t96740.html" class="external autonumber" title="http://www.eclipsezone.com/eclipse/forums/t96740.html" rel="nofollow">[1]</a>] and for service lookup in [<a href="http://www.eclipsezone.com/eclipse/forums/t97690.rhtml" class="external autonumber" title="http://www.eclipsezone.com/eclipse/forums/t97690.rhtml" rel="nofollow">[2]</a>]. |
| Even if you do not want to do this: Why not just use OSGi tools like ServiceTracker or implementing ServiceListener to locate services? See [<a href="http://felix.apache.org/site/apache-felix-tutorial-example-5.html" class="external autonumber" title="http://felix.apache.org/site/apache-felix-tutorial-example-5.html" rel="nofollow">[3]</a>] or [<a href="http://felix.apache.org/site/apache-felix-tutorial-example-6.html" class="external autonumber" title="http://felix.apache.org/site/apache-felix-tutorial-example-6.html" rel="nofollow">[4]</a>] for simple examples. |
| </p><p><br /> |
| Ivan Churkin: |
| It was only a proposal. Maybe you are right and its unnecessary. My reasons was:... It was only a proposal. Maybe you are right and its unnecessary. My reasons was: |
| It was duplicated code in components - I only extract that code. |
| The "registry service" allows to encapsulate logic on choosing endpoint service => The usage is easier. In the example, for finding measure |
| </p> |
| <div dir="ltr" style="text-align: left;"><pre class="source-java">IGeometryRegistry registry = <span class="br0">(</span>IGeometryRegistry<span class="br0">)</span>_context.<span class="me1">getService</span><span class="br0">(</span>reference<span class="br0">)</span> |
| <span class="kw3">Double</span> measure = registry.<span class="me1">getMeasure</span><span class="br0">(</span>o<span class="br0">)</span></pre></div> |
| <p>its not required to know the type of object to measure for choosing exact service. |
| </p><p><br /> |
| </p> |
| <a name="Technical_proposal"></a><h2> <span class="mw-headline"> Technical proposal </span></h2> |
| <p>The eccenca structure should be flexible, some bundles/services may be installed/added on the fly, other may not present in installation. |
| There are a lot of tasks that requires flexible access to services. For example to get a JMS queue (from some default and unknown exactly JMS service) or to apply some node transformer during search query processing. |
| </p><p>In the exact program point service that should be used is unknown exactly but it is known some common characteristic. For example: |
| </p> |
| <ol><li> "Its JMS engine" |
| </li><li> "Its Node Transformer" |
| </li><li> "Its Transformer" |
| </li></ol> |
| <p>It should be declared a common way how to create/access that groups |
| The idea is very simple. Instead of calling (unknown) service directly it should be asked some (fixed) broker (or registry service) to delegate a task. |
| </p><p><br /> |
| It was done a utility bundle that makes creating of that groups easy. |
| HOW to make a service registry and plugins step-by-step with the help of utility classes. |
| </p> |
| <ol><li> Create a bundle for a registry service, for example its org.eclipse.eilf.geometry |
| </li><li> Add dependancy to org.eclipse.eilf.utils bundle |
| </li><li> Create an interface for plugins |
| </li></ol> |
| <p>IGeometry.java |
| </p> |
| <div dir="ltr" style="text-align: left;"><pre class="source-java"><span class="kw1">public</span> <span class="kw1">interface</span> IGeometry<span class="br0">{</span> |
| <span class="kw3">Double</span> getMeasure<span class="br0">(</span><span class="kw3">Object</span> object<span class="br0">)</span> |
| <span class="br0">}</span></pre></div> |
| <ol><li> Create an interface for broker (here its inherited from plug-in interface) |
| </li></ol> |
| <p>IGeometryRegistry.java |
| </p> |
| <div dir="ltr" style="text-align: left;"><pre class="source-java"><span class="kw1">public</span> <span class="kw1">interface</span> IGeometryRegistry <span class="kw1">extends</span> IGeometry<span class="br0">{</span> |
| <span class="kw3">Double</span> getMeasure<span class="br0">(</span><span class="kw3">Object</span> object<span class="br0">)</span> |
| ... <span class="me1">some</span> other methods |
| <span class="br0">}</span></pre></div> |
| <ol><li> do export that interfaces (make it visible to other plugins). |
| </li></ol> |
| <ol><li> write a realization of broker by extending abstract class org.eclipse.eilf.utils.service.AbstractRegistryService |
| </li></ol> |
| <div dir="ltr" style="text-align: left;"><pre class="source-java"><span class="kw1">public</span> <span class="kw1">class</span> GeometryRegistry <span class="kw1">extends</span> AbstractRegistryService<IGeometry> <span class="kw1">implements</span> IGeometryRegistry<span class="br0">{</span> |
| |
| <span class="kw1">public</span> GeometryRegistry<span class="br0">(</span><span class="kw1">final</span> BundleContext context<span class="br0">)</span> <span class="br0">{</span> |
| <span class="kw1">super</span><span class="br0">(</span>context, IGeometry.<span class="kw1">class</span>.<span class="me1">getName</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>; |
| <span class="br0">}</span> |
| |
| |
| <span class="kw1">private</span> <span class="kw3">String</span> calculateObjectType<span class="br0">(</span><span class="kw3">Object</span> object<span class="br0">)</span>; |
| |
| <span class="kw1">public</span> <span class="kw3">Double</span> getMeasure<span class="br0">(</span><span class="kw3">Object</span> object<span class="br0">)</span><span class="br0">{</span> |
| <span class="kw3">String</span> objectType = calculateObjectType<span class="br0">(</span>object<span class="br0">)</span>; |
| ServiceReferebce reference = <span class="kw1">this</span>.<span class="me1">findFirstServiceReferenceByName</span><span class="br0">(</span>objectType<span class="br0">)</span> |
| <span class="kw1">if</span><span class="br0">(</span>reference == <span class="kw2">null</span><span class="br0">)</span><span class="br0">{</span> |
| <span class="kw1">throw</span> ...; |
| <span class="br0">}</span> |
| IGeometry plugin = <span class="kw1">this</span>.<span class="me1">getService</span><span class="br0">(</span>reference<span class="br0">)</span>; |
| <span class="kw3">Double</span> measure = plugin.<span class="me1">getMeasure</span><span class="br0">(</span>object<span class="br0">)</span>; |
| <span class="kw1">this</span>.<span class="me1">ungetService</span><span class="br0">(</span>reference<span class="br0">)</span>; |
| <span class="kw1">return</span> measure; |
| <span class="br0">}</span> |
| <span class="br0">}</span></pre></div> |
| <ol><li> Activate it by extending org.eclipse.eilf.utils.service.AbstractServiceActivator |
| </li></ol> |
| <div dir="ltr" style="text-align: left;"><pre class="source-java"><span class="kw1">public</span> <span class="kw1">final</span> <span class="kw1">class</span> <span class="kw3">Activator</span> <span class="kw1">extends</span> AbstractServiceActivator<IGeometryRegistry> <span class="br0">{</span> |
| |
| <span class="coMULTI">/* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.eilf.utils.service.AbstractServiceActivator#getServiceGroupName() |
| */</span> |
| @Override |
| <span class="kw1">protected</span> <span class="kw1">final</span> <span class="kw3">String</span> getServiceGroupName<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span> |
| <span class="kw1">return</span> IGeometryRegistry.<span class="kw1">class</span>.<span class="me1">getName</span><span class="br0">(</span><span class="br0">)</span>; |
| <span class="br0">}</span> |
| |
| <span class="coMULTI">/* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.eilf.utils.service.AbstractServiceActivator#getServiceSubName() |
| */</span> |
| @Override |
| <span class="kw1">protected</span> <span class="kw1">final</span> <span class="kw3">String</span> getServiceSubName<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span> |
| <span class="kw1">return</span> <span class="kw2">null</span>; |
| <span class="br0">}</span> |
| |
| <span class="coMULTI">/* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.eilf.utils.service.AbstractServiceActivator#newServiceInstance(org.osgi.framework.BundleContext) |
| */</span> |
| @Override |
| <span class="kw1">protected</span> IGeometryRegistry newServiceInstance<span class="br0">(</span><span class="kw1">final</span> BundleContext context<span class="br0">)</span> <span class="br0">{</span> |
| <span class="kw1">return</span> <span class="kw1">new</span> GeometryRegistry<span class="br0">(</span>context<span class="br0">)</span>; |
| <span class="br0">}</span> |
| |
| <span class="br0">}</span></pre></div> |
| <ol><li> Create a bundle for plug-in service, for example its org.eclipse.eilf.geometry.square |
| </li><li> Add dependancy to org.eclipse.eilf.utils bundle |
| </li><li> write a realization of plug-in service |
| </li></ol> |
| <div dir="ltr" style="text-align: left;"><pre class="source-java"><span class="kw1">public</span> <span class="kw1">class</span> Square <span class="kw1">implements</span> IGeometry<span class="br0">{</span> |
| <span class="kw1">public</span> <span class="kw3">Double</span> getMeasure<span class="br0">(</span><span class="kw3">Object</span> object<span class="br0">)</span><span class="br0">{</span> |
| Square square = <span class="br0">(</span>Square<span class="br0">)</span> object; |
| <span class="kw1">return</span> square.<span class="me1">x</span> * square.<span class="me1">y</span>; |
| <span class="br0">}</span> |
| <span class="br0">}</span></pre></div> |
| <ol><li> Activate it by extending org.eclipse.eilf.utils.service.AbstractServiceActivator |
| </li></ol> |
| <div dir="ltr" style="text-align: left;"><pre class="source-java"><span class="kw1">public</span> <span class="kw1">final</span> <span class="kw1">class</span> <span class="kw3">Activator</span> <span class="kw1">extends</span> AbstractServiceActivator<Square> <span class="br0">{</span> |
| |
| <span class="coMULTI">/* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.eilf.utils.service.AbstractServiceActivator#getServiceGroupName() |
| */</span> |
| @Override |
| <span class="kw1">protected</span> <span class="kw1">final</span> <span class="kw3">String</span> getServiceGroupName<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span> |
| <span class="kw1">return</span> IGeometry.<span class="kw1">class</span>.<span class="me1">getName</span><span class="br0">(</span><span class="br0">)</span>; |
| <span class="br0">}</span> |
| |
| <span class="coMULTI">/* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.eilf.utils.service.AbstractServiceActivator#getServiceSubName() |
| */</span> |
| @Override |
| <span class="kw1">protected</span> <span class="kw1">final</span> <span class="kw3">String</span> getServiceSubName<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span> |
| <span class="kw1">return</span> <span class="st0">"square"</span>; |
| <span class="br0">}</span> |
| |
| <span class="coMULTI">/* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.eilf.utils.service.AbstractServiceActivator#newServiceInstance(org.osgi.framework.BundleContext) |
| */</span> |
| @Override |
| <span class="kw1">protected</span> Square newServiceInstance<span class="br0">(</span><span class="kw1">final</span> BundleContext context<span class="br0">)</span> <span class="br0">{</span> |
| <span class="kw1">return</span> <span class="kw1">new</span> Square<span class="br0">(</span><span class="br0">)</span>; |
| <span class="br0">}</span> |
| |
| <span class="br0">}</span></pre></div> |
| <ol><li> example of usage |
| </li></ol> |
| <div dir="ltr" style="text-align: left;"><pre class="source-java">.... |
| <span class="me1">IGeometryRegistry</span> registry = <span class="br0">(</span>IGeometryRegistry<span class="br0">)</span>_context.<span class="me1">getService</span><span class="br0">(</span>reference<span class="br0">)</span> |
| <span class="co1">//it should exists otherwise its critical error</span> |
| <span class="kw3">Double</span> measure = registry.<span class="me1">getMeasure</span><span class="br0">(</span>o<span class="br0">)</span></pre></div> |
| <p><br /> |
| </p><p><br /> |
| Sample bundles based on this idea implemented and located in "EILF/trunc" |
| </p><p>Query processing sample |
| </p><p>org.eclipse.eilf.query.processing (registry) |
| org.eclipse.eilf.exampleplugin.query.processing (sample plug-in) |
| org.eclipse.eilf.query.processing.test (test) |
| </p><p>JMS access |
| org.eclipse.eilf.jms (registry) |
| org.apache.activemq (plug-in) |
| </p> |
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