EventManagerService.java example

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streamflow-core-master
/**
 *
 * Copyright
 * 2009-2015 Jayway Products AB
 * 2016-2017 Föreningen Sambruk
 *
 * Licensed under AGPL, Version 3.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.gnu.org/licenses/agpl.txt
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package se.streamsource.streamflow.web.management;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import javax.management.MBeanException;
import javax.management.MBeanServer;
import javax.management.Notification;
import javax.management.ObjectName;
import javax.management.modelmbean.ModelMBeanInfo;
import javax.management.modelmbean.ModelMBeanInfoSupport;
import javax.management.modelmbean.ModelMBeanNotificationInfo;
import javax.management.modelmbean.RequiredModelMBean;

import org.qi4j.api.injection.scope.Service;
import org.qi4j.api.injection.scope.Structure;
import org.qi4j.api.mixin.Mixins;
import org.qi4j.api.service.Activatable;
import org.qi4j.api.service.ServiceComposite;
import org.qi4j.api.structure.Application;

import se.streamsource.streamflow.infrastructure.event.domain.DomainEvent;
import se.streamsource.streamflow.infrastructure.event.domain.TransactionDomainEvents;
import se.streamsource.streamflow.infrastructure.event.domain.source.EventStream;
import se.streamsource.streamflow.infrastructure.event.domain.source.TransactionListener;
import se.streamsource.streamflow.infrastructure.event.domain.source.helper.Events;

/**
 * Service for exposing domain events through JMX. Allows all domain events to be listened to
 * as JMX Notifications. The event name is set as notification name, and the JSON serialization of
 * the event is used as user date in the notifications.
 */
@Mixins(EventManagerService.Mixin.class)
public interface EventManagerService
      extends Activatable, ServiceComposite
{
   class Mixin
         implements Activatable, TransactionListener
   {
      @Structure
      Application application;

      @Service
      EventStream stream;

      @Service
      MBeanServer server;
      public ObjectName objectName;

      long seq = 0;
      public RequiredModelMBean mbean;
      ExecutorService executor;

      public void activate() throws Exception
      {
         ModelMBeanNotificationInfo[] notificationInfos = new ModelMBeanNotificationInfo[1];
         notificationInfos[0] = new ModelMBeanNotificationInfo( new String[]{"domainevent"}, "Domain events", "Domain events" );
         ModelMBeanInfo info = new ModelMBeanInfoSupport( EventManagerService.class.getName(),
               "Domain events",
               null, null, null, notificationInfos );
         mbean = new RequiredModelMBean( info );

         objectName = new ObjectName( "Qi4j:application="+application.name()+",class=Log,name=domainevents" );
         server.registerMBean( mbean, objectName );

         stream.registerListener( this );

         executor = Executors.newSingleThreadExecutor();
      }

      public void passivate() throws Exception
      {
         executor.shutdown();

         server.unregisterMBean( objectName );
         stream.unregisterListener( this );
      }

      public final synchronized void notifyTransactions( final Iterable<TransactionDomainEvents> transactions )
      {
         executor.submit( new Runnable()
         {
            public void run()
            {
               try
               {
                  for (DomainEvent domainEvent : Events.events( transactions ))
                  {
                     final Notification notification = new Notification( "domainevent", objectName, seq++, domainEvent.on().get().getTime(), domainEvent.name().get() );
                     notification.setUserData( domainEvent.toJSON() );

                     mbean.sendNotification( notification );
                  }

               } catch (MBeanException e)
               {
                  e.printStackTrace();
               }
            }
         }
         );

      }
   }
}