Examples of com.nokia.dempsy.config.ApplicationDefinition

com.nokia.dempsy.config.ApplicationDefinition
Configuration should be thought of as an xpath with {@link ApplicationDefinition} at the root element and {@link ClusterDefinition}s as the child elements. It's used to layout the topology of an entire Dempsy appliation. Let's say the following simple processing pipeline constitutes a Dempsy application:
```
  SimpleAdaptor -> SimpleMessageProcessor  
```
The straightforward configuration that accepts all of the defaults would be:
```
  new ApplicationDefinition("my-application").add( new ClusterDefinition("adaptor-stage",new SimpleMessageAdaptor()), new ClusterDefinition("processor-stage",new SimpleMessageProcessor()));  
```
As an example using Spring, your application context would contain:
```
  <bean class="com.nokia.dempsy.config.ApplicationDefinition"> <property name="applicationName" value="my-application" /> <property name="clusterDefinitions"> <list> <bean class="com.nokia.dempsy.config.ClusterDefinition"> <constructor-arg name="clusterName" value="adaptor-stage" /> <property name="adaptor" > <bean class="SimpleMessageAdaptor" /> </property> </bean> <bean class="com.nokia.dempsy.config.ClusterDefinition"> <constructor-arg name="clusterName" value="processor-stage" /> <property name="messageProcessorPrototype"> <bean class="SimpleMessageProcessor" /> </property> </bean> </list> </property> </bean>  
```
Notice, when using a dependency injection framework, you have the ability to configure your prototypes ( {@link MessageProcessor}s) and {@link Adaptor}s independently from Dempsy. The Dempsy {@link ApplicationDefinition} would then be the point where you definethe topology of processing chain. This nicely decouples the two concerns.

While any DI framework can be used if you then join the {@link ApplicationDefinition} toa Dempy instance (by hand), this is unnecessary when using either Spring or Guice as both are supported out-of-the-box.

Note: for ease of use when configuring by hand (not using a dependency injection framework like Spring or Guice) all "setters" (all 'mutators' in general) return the {@link ApplicationDefinition}itself for the purpose of chaining.

      onodes = System.setProperty("min_nodes_for_cluster", "1");
      oslots = System.setProperty("total_slots_for_cluster", "20");


      final ClusterId clusterId = new ClusterId("test", "test-slot");
      Destination destination = new Destination() {};
      ApplicationDefinition app = new ApplicationDefinition(clusterId.getApplicationName());
      DecentralizedRoutingStrategy strategy = new DecentralizedRoutingStrategy(1, 1);
      app.setRoutingStrategy(strategy);
      app.setSerializer(new JavaSerializer<Object>());
      ClusterDefinition cd = new ClusterDefinition(clusterId.getMpClusterName());
      cd.setMessageProcessorPrototype(new GoodTestMp());
      app.add(cd);
      app.initialize();
      
      LocalClusterSessionFactory mpfactory = new LocalClusterSessionFactory();
      ClusterInfoSession session = mpfactory.createSession();
      
      TestUtils.createClusterLevel(clusterId, session);

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      ctx[0] = "fullApp/Dempsy-FullUp.xml";
      Map<ClusterId,DempsyHolder> dempsys = new HashMap<ClusterId,DempsyHolder>();


      try
      {
         ApplicationDefinition ad = new FullApplication().getTopology();
         ad.initialize();


         List<ClusterDefinition> clusters = ad.getClusterDefinitions();
         for (int i = clusters.size() - 1; i >= 0; i--)
         {
            ClusterDefinition cluster = clusters.get(i);
            CheckCluster.toCheckAgainst = cluster.getClusterId();

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      Map<ClusterId,DempsyHolder> dempsys = new HashMap<ClusterId,DempsyHolder>();
      DempsyHolder spare = new DempsyHolder();


      try
      {
         ApplicationDefinition ad = new FullApplication().getTopology();
         ad.initialize();


         List<ClusterDefinition> clusters = ad.getClusterDefinitions();
         for (int i = clusters.size() - 1; i >= 0; i--)
         {
            ClusterDefinition cluster = clusters.get(i);
            CheckCluster.toCheckAgainst = cluster.getClusterId();

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public class TestRouterInstantiation
{
   @Test
   public void testGetMessages() throws Throwable
   {
      ApplicationDefinition app = new ApplicationDefinition("test");
      Router router = new Router(app);


      List<Object> messages = new ArrayList<Object>();
      Object first = new Object();
      router.getMessages(first, messages);

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   }
   
   @Test
   public void testDispatchBadMessage() throws Throwable
   {
      ApplicationDefinition app = new ApplicationDefinition("test");
      Router router = new Router(app);


      Object o;
      router.dispatch(o = new Object() {
         @MessageKey

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   }


   @Test
   public void testGetMessagesNester() throws Throwable
   {
      ApplicationDefinition app = new ApplicationDefinition("test");
      Router router = new Router(app);
      
      List<Object> messages = new ArrayList<Object>();
      List<Object> parent = new ArrayList<Object>();
      List<Object> nested = new ArrayList<Object>();

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      }
   }
   
   public ApplicationDefinition getTopology() throws DempsyException
   {
      ApplicationDefinition ret = new ApplicationDefinition(FullApplication.class.getSimpleName()).
            add(new ClusterDefinition(MyAdaptor.class.getSimpleName()).setAdaptor(new MyAdaptor())).
            add(new ClusterDefinition(MyMp.class.getSimpleName()).setMessageProcessorPrototype(new MyMp()).setOutputExecuter(new RelativeOutputSchedule(1, TimeUnit.SECONDS))).
            add(new ClusterDefinition(MyRankMp.class.getSimpleName()).setMessageProcessorPrototype(new MyRankMp()));
      
      return ret;

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            };
         };
         sessionRef.set(session);


         final FullApplication app = new FullApplication();
         ApplicationDefinition ad = app.getTopology();


         assertEquals(0,processCount.intValue()); // no calls yet


         dempsy[0] = getDempsyFor(new ClusterId(FullApplication.class.getSimpleName(),FullApplication.MyAdaptor.class.getSimpleName()),ad);
         dempsy[0].setClusterSessionFactory(new ZookeeperSessionFactory("127.0.0.1:" + port,5000));

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Related Classes of com.nokia.dempsy.config.ApplicationDefinition

com.nokia.dempsy.cluster.zookeeper.FullApplication

com.nokia.dempsy.cluster.zookeeper.TestFullApp

com.nokia.dempsy.cluster.zookeeper.TestZookeeperClusterResilience

com.nokia.dempsy.router.TestRouterClusterManagement

com.nokia.dempsy.router.TestRouterInstantiation

com.nokia.dempsy.DempsyException

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