extends mgmt simulator. Extended scalabaility of dmf listener.

Signed-off-by: Kai Zimmermann <kai.zimmermann@bosch-si.com>

hawkbit-dmf-amqp/src/main/java/org/eclipse/hawkbit/amqp/AmqpConfiguration.java

@@ -32,6 +32,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.core.task.TaskExecutor;
 import org.springframework.retry.backoff.ExponentialBackOffPolicy;
 import org.springframework.retry.support.RetryTemplate;;
 
@@ -58,6 +59,9 @@ public class AmqpConfiguration {
     @Autowired
     private ConnectionFactory rabbitConnectionFactory;
 
+    @Autowired
+    private TaskExecutor taskExecutor;
+
     @Configuration
     protected static class RabbitConnectionFactoryCreator {
 
@@ -240,6 +244,9 @@ public class AmqpConfiguration {
         containerFactory.setDefaultRequeueRejected(false);
         containerFactory.setConnectionFactory(rabbitConnectionFactory);
         containerFactory.setMissingQueuesFatal(amqpProperties.isMissingQueuesFatal());
+        containerFactory.setTaskExecutor(taskExecutor);
+        containerFactory.setConcurrentConsumers(3);
+        containerFactory.setMaxConcurrentConsumers(amqpProperties.getMaxConcurrentConsumers());
         return containerFactory;
     }
 

hawkbit-dmf-amqp/src/main/java/org/eclipse/hawkbit/amqp/AmqpProperties.java

@@ -38,13 +38,26 @@ public class AmqpProperties {
     /**
      * Missing queue fatal.
      */
-    private boolean missingQueuesFatal = false;
+    private boolean missingQueuesFatal;
 
     /**
      * Requested heartbeat interval from broker in {@link TimeUnit#SECONDS}.
      */
     private int requestedHeartBeat = (int) TimeUnit.SECONDS.toSeconds(60);
 
+    /**
+     * Sets an upper limit to the number of consumers.
+     */
+    private int maxConcurrentConsumers = 10;
+
+    public int getMaxConcurrentConsumers() {
+        return maxConcurrentConsumers;
+    }
+
+    public void setMaxConcurrentConsumers(final int maxConcurrentConsumers) {
+        this.maxConcurrentConsumers = maxConcurrentConsumers;
+    }
+
     /**
      * Is missingQueuesFatal enabled
      *