Fix issue in event handling in participants

Fix issue in event handling in participants
and refactor Participant Publisher and Listener

Issue-ID: POLICY-3544
Change-Id: Ic92ffa79d303adfb1c3319fbfefb1faef911a9d4
Signed-off-by: FrancescoFioraEst <francesco.fiora@est.tech>

14 files changed, 203 insertions, 100 deletions

diff --git a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ControlLoopStateChangeListener.java b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ControlLoopStateChangeListener.java
index 0b9110bd0..d24f32f2f 100644
--- a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ControlLoopStateChangeListener.java
+++ b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ControlLoopStateChangeListener.java
@@ -21,6 +21,7 @@
 package org.onap.policy.clamp.controlloop.participant.intermediary.comm;
 
 import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ControlLoopStateChange;
+import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantMessageType;
 import org.onap.policy.clamp.controlloop.participant.intermediary.handler.ParticipantHandler;
 import org.springframework.stereotype.Component;
 
@@ -39,4 +40,9 @@ public class ControlLoopStateChangeListener extends ParticipantListener<ControlL
         super(ControlLoopStateChange.class, participantHandler,
                 participantHandler::handleControlLoopStateChange);
     }
+
+    @Override
+    public String getType() {
+        return ParticipantMessageType.CONTROL_LOOP_STATE_CHANGE.name();
+    }
 }
diff --git a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ControlLoopUpdateListener.java b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ControlLoopUpdateListener.java
index 56bc1fd9a..f9dec1863 100644
--- a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ControlLoopUpdateListener.java
+++ b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ControlLoopUpdateListener.java
@@ -21,6 +21,7 @@
 package org.onap.policy.clamp.controlloop.participant.intermediary.comm;
 
 import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ControlLoopUpdate;
+import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantMessageType;
 import org.onap.policy.clamp.controlloop.participant.intermediary.handler.ParticipantHandler;
 import org.springframework.stereotype.Component;
 
@@ -38,4 +39,9 @@ public class ControlLoopUpdateListener extends ParticipantListener<ControlLoopUp
     public ControlLoopUpdateListener(final ParticipantHandler participantHandler) {
         super(ControlLoopUpdate.class, participantHandler, participantHandler::handleControlLoopUpdate);
     }
+
+    @Override
+    public String getType() {
+        return ParticipantMessageType.CONTROL_LOOP_UPDATE.name();
+    }
 }
diff --git a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantAckListener.java b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantAckListener.java
index 4b7224938..113f75dd5 100644
--- a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantAckListener.java
+++ b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantAckListener.java
@@ -24,6 +24,7 @@ package org.onap.policy.clamp.controlloop.participant.intermediary.comm;
 
 import java.util.function.Consumer;
 import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantAckMessage;
+import org.onap.policy.clamp.controlloop.participant.intermediary.handler.Listener;
 import org.onap.policy.clamp.controlloop.participant.intermediary.handler.ParticipantHandler;
 import org.onap.policy.common.endpoints.event.comm.Topic.CommInfrastructure;
 import org.onap.policy.common.endpoints.listeners.ScoListener;
@@ -32,7 +33,8 @@ import org.onap.policy.common.utils.coder.StandardCoderObject;
 /**
  * Abstract Listener for Participant Ack messages sent by runtime.
  */
-public abstract class ParticipantAckListener<T extends ParticipantAckMessage> extends ScoListener<T> {
+public abstract class ParticipantAckListener<T extends ParticipantAckMessage> extends ScoListener<T>
+        implements Listener {
 
     private final ParticipantHandler participantHandler;
     private final Consumer<T> consumer;
@@ -52,6 +54,13 @@ public abstract class ParticipantAckListener<T extends ParticipantAckMessage> ex
 
     @Override
     public void onTopicEvent(CommInfrastructure infra, String topic, StandardCoderObject sco, T message) {
-        consumer.accept(message);
+        if (participantHandler.appliesTo(message)) {
+            consumer.accept(message);
+        }
+    }
+
+    @Override
+    public ScoListener<T> getScoListener() {
+        return this;
     }
 }
diff --git a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantDeregisterAckListener.java b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantDeregisterAckListener.java
index e20f481f8..5440e005b 100644
--- a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantDeregisterAckListener.java
+++ b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantDeregisterAckListener.java
@@ -21,6 +21,7 @@
 package org.onap.policy.clamp.controlloop.participant.intermediary.comm;
 
 import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantDeregisterAck;
+import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantMessageType;
 import org.onap.policy.clamp.controlloop.participant.intermediary.handler.ParticipantHandler;
 import org.springframework.stereotype.Component;
 
@@ -39,4 +40,9 @@ public class ParticipantDeregisterAckListener extends ParticipantAckListener<Par
     public ParticipantDeregisterAckListener(final ParticipantHandler participantHandler) {
         super(ParticipantDeregisterAck.class, participantHandler, participantHandler::handleParticipantDeregisterAck);
     }
+
+    @Override
+    public String getType() {
+        return ParticipantMessageType.PARTICIPANT_DEREGISTER_ACK.name();
+    }
 }
diff --git a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantListener.java b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantListener.java
index c6ad900b3..67af5c844 100644
--- a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantListener.java
+++ b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantListener.java
@@ -22,6 +22,7 @@ package org.onap.policy.clamp.controlloop.participant.intermediary.comm;
 
 import java.util.function.Consumer;
 import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantMessage;
+import org.onap.policy.clamp.controlloop.participant.intermediary.handler.Listener;
 import org.onap.policy.clamp.controlloop.participant.intermediary.handler.ParticipantHandler;
 import org.onap.policy.common.endpoints.event.comm.Topic.CommInfrastructure;
 import org.onap.policy.common.endpoints.listeners.ScoListener;
@@ -30,7 +31,7 @@ import org.onap.policy.common.utils.coder.StandardCoderObject;
 /**
  * Abstract Listener for Participant messages sent by CLAMP.
  */
-public abstract class ParticipantListener<T extends ParticipantMessage> extends ScoListener<T> {
+public abstract class ParticipantListener<T extends ParticipantMessage> extends ScoListener<T> implements Listener {
 
     private final ParticipantHandler participantHandler;
     private final Consumer<T> consumer;
@@ -54,4 +55,9 @@ public abstract class ParticipantListener<T extends ParticipantMessage> extends
             consumer.accept(message);
         }
     }
+
+    @Override
+    public ScoListener<T> getScoListener() {
+        return this;
+    }
 }
diff --git a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantMessagePublisher.java b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantMessagePublisher.java
index d8cc9eb6b..2941e9fd8 100644
--- a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantMessagePublisher.java
+++ b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantMessagePublisher.java
@@ -21,35 +21,43 @@
 package org.onap.policy.clamp.controlloop.participant.intermediary.comm;
 
 import java.util.List;
+import javax.ws.rs.core.Response.Status;
+import org.onap.policy.clamp.controlloop.common.exception.ControlLoopRuntimeException;
 import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ControlLoopAck;
 import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantDeregister;
 import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantRegister;
 import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantStatus;
 import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantUpdateAck;
+import org.onap.policy.clamp.controlloop.participant.intermediary.handler.Publisher;
 import org.onap.policy.common.endpoints.event.comm.TopicSink;
 import org.onap.policy.common.endpoints.event.comm.client.TopicSinkClient;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Component;
 
 /**
  * This class is used to send Participant Status messages to clamp using TopicSinkClient.
  *
  */
-public class ParticipantMessagePublisher {
+@Component
+public class ParticipantMessagePublisher implements Publisher {
     private static final Logger LOGGER = LoggerFactory.getLogger(ParticipantMessagePublisher.class);
 
-    private final TopicSinkClient topicSinkClient;
+    private boolean active = false;
+    private TopicSinkClient topicSinkClient;
 
     /**
      * Constructor for instantiating ParticipantMessagePublisher.
      *
      * @param topicSinks the topic sinks
      */
-    public ParticipantMessagePublisher(List<TopicSink> topicSinks) {
+    @Override
+    public void active(List<TopicSink> topicSinks) {
         if (topicSinks.size() != 1) {
             throw new IllegalArgumentException("Configuration unsupported, Topic sinks greater than 1");
         }
         this.topicSinkClient = new TopicSinkClient(topicSinks.get(0));
+        active = true;
     }
 
     /**
@@ -58,6 +66,9 @@ public class ParticipantMessagePublisher {
      * @param participantStatus the Participant Status
      */
     public void sendParticipantStatus(final ParticipantStatus participantStatus) {
+        if (!active) {
+            throw new ControlLoopRuntimeException(Status.NOT_ACCEPTABLE, "Not Active!");
+        }
         topicSinkClient.send(participantStatus);
         LOGGER.debug("Sent Participant Status message to CLAMP - {}", participantStatus);
     }
@@ -68,6 +79,9 @@ public class ParticipantMessagePublisher {
      * @param participantRegister the Participant Status
      */
     public void sendParticipantRegister(final ParticipantRegister participantRegister) {
+        if (!active) {
+            throw new ControlLoopRuntimeException(Status.NOT_ACCEPTABLE, "Not Active!");
+        }
         topicSinkClient.send(participantRegister);
         LOGGER.debug("Sent Participant Register message to CLAMP - {}", participantRegister);
     }
@@ -78,6 +92,9 @@ public class ParticipantMessagePublisher {
      * @param participantDeregister the Participant Status
      */
     public void sendParticipantDeregister(final ParticipantDeregister participantDeregister) {
+        if (!active) {
+            throw new ControlLoopRuntimeException(Status.NOT_ACCEPTABLE, "Not Active!");
+        }
         topicSinkClient.send(participantDeregister);
         LOGGER.debug("Sent Participant Deregister message to CLAMP - {}", participantDeregister);
     }
@@ -88,6 +105,9 @@ public class ParticipantMessagePublisher {
      * @param participantUpdateAck the Participant Update Ack
      */
     public void sendParticipantUpdateAck(final ParticipantUpdateAck participantUpdateAck) {
+        if (!active) {
+            throw new ControlLoopRuntimeException(Status.NOT_ACCEPTABLE, "Not Active!");
+        }
         topicSinkClient.send(participantUpdateAck);
         LOGGER.debug("Sent Participant Update Ack message to CLAMP - {}", participantUpdateAck);
     }
@@ -98,6 +118,9 @@ public class ParticipantMessagePublisher {
      * @param controlLoopAck ControlLoop Update/StateChange Ack
      */
     public void sendControlLoopAck(final ControlLoopAck controlLoopAck) {
+        if (!active) {
+            throw new ControlLoopRuntimeException(Status.NOT_ACCEPTABLE, "Not Active!");
+        }
         topicSinkClient.send(controlLoopAck);
         LOGGER.debug("Sent ControlLoop Update/StateChange Ack to runtime - {}", controlLoopAck);
     }
@@ -108,7 +131,15 @@ public class ParticipantMessagePublisher {
      * @param participantStatus the Participant Status
      */
     public void sendHeartbeat(final ParticipantStatus participantStatus) {
+        if (!active) {
+            throw new ControlLoopRuntimeException(Status.NOT_ACCEPTABLE, "Not Active!");
+        }
         topicSinkClient.send(participantStatus);
         LOGGER.debug("Sent Participant heartbeat to CLAMP - {}", participantStatus);
     }
+
+    @Override
+    public void stop() {
+        active = false;
+    }
 }
diff --git a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantRegisterAckListener.java b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantRegisterAckListener.java
index a15a2a850..7be460815 100644
--- a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantRegisterAckListener.java
+++ b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantRegisterAckListener.java
@@ -20,6 +20,7 @@
 
 package org.onap.policy.clamp.controlloop.participant.intermediary.comm;
 
+import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantMessageType;
 import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantRegisterAck;
 import org.onap.policy.clamp.controlloop.participant.intermediary.handler.ParticipantHandler;
 import org.springframework.stereotype.Component;
@@ -39,4 +40,9 @@ public class ParticipantRegisterAckListener extends ParticipantAckListener<Parti
     public ParticipantRegisterAckListener(final ParticipantHandler participantHandler) {
         super(ParticipantRegisterAck.class, participantHandler, participantHandler::handleParticipantRegisterAck);
     }
+
+    @Override
+    public String getType() {
+        return ParticipantMessageType.PARTICIPANT_REGISTER_ACK.name();
+    }
 }
diff --git a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantStatusReqListener.java b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantStatusReqListener.java
index 0881edb19..9e978fe75 100644
--- a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantStatusReqListener.java
+++ b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantStatusReqListener.java
@@ -20,6 +20,7 @@
 
 package org.onap.policy.clamp.controlloop.participant.intermediary.comm;
 
+import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantMessageType;
 import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantStatusReq;
 import org.onap.policy.clamp.controlloop.participant.intermediary.handler.ParticipantHandler;
 import org.springframework.stereotype.Component;
@@ -38,4 +39,9 @@ public class ParticipantStatusReqListener extends ParticipantListener<Participan
     public ParticipantStatusReqListener(final ParticipantHandler participantHandler) {
         super(ParticipantStatusReq.class, participantHandler, participantHandler::handleParticipantStatusReq);
     }
+
+    @Override
+    public String getType() {
+        return ParticipantMessageType.PARTICIPANT_STATUS_REQ.name();
+    }
 }
diff --git a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantUpdateListener.java b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantUpdateListener.java
index 42bd52d9a..da45501e7 100644
--- a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantUpdateListener.java
+++ b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/comm/ParticipantUpdateListener.java
@@ -20,6 +20,7 @@
 
 package org.onap.policy.clamp.controlloop.participant.intermediary.comm;
 
+import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantMessageType;
 import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantUpdate;
 import org.onap.policy.clamp.controlloop.participant.intermediary.handler.ParticipantHandler;
 import org.springframework.stereotype.Component;
@@ -38,4 +39,9 @@ public class ParticipantUpdateListener extends ParticipantListener<ParticipantUp
     public ParticipantUpdateListener(final ParticipantHandler participantHandler) {
         super(ParticipantUpdate.class, participantHandler, participantHandler::handleParticipantUpdate);
     }
+
+    @Override
+    public String getType() {
+        return ParticipantMessageType.PARTICIPANT_UPDATE.name();
+    }
 }
diff --git a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/config/BeanFactory.java b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/config/BeanFactory.java
deleted file mode 100644
index e363504a5..000000000
--- a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/config/BeanFactory.java
+++ /dev/null
@@ -1,55 +0,0 @@
-/*-
- * ============LICENSE_START=======================================================
- *  Copyright (C) 2021 Nordix Foundation.
- * ================================================================================
- * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
- *
- * 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.
- *
- * SPDX-License-Identifier: Apache-2.0
- * ============LICENSE_END=========================================================
- */
-
-package org.onap.policy.clamp.controlloop.participant.intermediary.config;
-
-import java.util.List;
-import org.onap.policy.clamp.controlloop.participant.intermediary.comm.ParticipantMessagePublisher;
-import org.onap.policy.clamp.controlloop.participant.intermediary.parameters.ParticipantParameters;
-import org.onap.policy.common.endpoints.event.comm.TopicEndpointManager;
-import org.onap.policy.common.endpoints.event.comm.TopicSink;
-import org.onap.policy.common.endpoints.listeners.MessageTypeDispatcher;
-import org.springframework.context.annotation.Bean;
-import org.springframework.context.annotation.Configuration;
-
-@Configuration
-public class BeanFactory {
-
-    // Name of the message type for messages on topics
-    private static final String[] MSG_TYPE_NAMES = {"messageType"};
-
-    /**
-     * create ParticipantMessagePublisher.
-     *
-     * @param parameters the ParticipantParameters
-     * @return ParticipantMessagePublisher
-     */
-    @Bean
-    public ParticipantMessagePublisher publisher(final ParticipantParameters parameters) {
-        List<TopicSink> topicSinks = TopicEndpointManager.getManager()
-                .addTopicSinks(parameters.getIntermediaryParameters().getClampControlLoopTopics().getTopicSinks());
-        return new ParticipantMessagePublisher(topicSinks);
-    }
-
-    @Bean
-    public MessageTypeDispatcher msgDispatcher() {
-        return new MessageTypeDispatcher(MSG_TYPE_NAMES);
-    }
-}
diff --git a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/handler/IntermediaryActivator.java b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/handler/IntermediaryActivator.java
index 4fc0ae1b1..754bf2887 100644
--- a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/handler/IntermediaryActivator.java
+++ b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/handler/IntermediaryActivator.java
@@ -23,20 +23,13 @@ package org.onap.policy.clamp.controlloop.participant.intermediary.handler;
 import java.io.Closeable;
 import java.io.IOException;
 import java.util.List;
-import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantMessageType;
 import org.onap.policy.clamp.controlloop.participant.intermediary.api.ParticipantIntermediaryApi;
-import org.onap.policy.clamp.controlloop.participant.intermediary.comm.ControlLoopStateChangeListener;
-import org.onap.policy.clamp.controlloop.participant.intermediary.comm.ControlLoopUpdateListener;
-import org.onap.policy.clamp.controlloop.participant.intermediary.comm.ParticipantDeregisterAckListener;
-import org.onap.policy.clamp.controlloop.participant.intermediary.comm.ParticipantRegisterAckListener;
-import org.onap.policy.clamp.controlloop.participant.intermediary.comm.ParticipantStatusReqListener;
-import org.onap.policy.clamp.controlloop.participant.intermediary.comm.ParticipantUpdateListener;
 import org.onap.policy.clamp.controlloop.participant.intermediary.parameters.ParticipantParameters;
 import org.onap.policy.common.endpoints.event.comm.TopicEndpointManager;
+import org.onap.policy.common.endpoints.event.comm.TopicSink;
 import org.onap.policy.common.endpoints.event.comm.TopicSource;
 import org.onap.policy.common.endpoints.listeners.MessageTypeDispatcher;
 import org.onap.policy.common.utils.services.ServiceManagerContainer;
-import org.springframework.context.ApplicationContext;
 import org.springframework.context.event.ContextClosedEvent;
 import org.springframework.context.event.ContextRefreshedEvent;
 import org.springframework.context.event.EventListener;
@@ -48,32 +41,50 @@ import org.springframework.stereotype.Component;
 @Component
 public class IntermediaryActivator extends ServiceManagerContainer implements Closeable {
 
-    private final ApplicationContext applicationContext;
+    private static final String[] MSG_TYPE_NAMES = {"messageType"};
 
     // Topics from which the participant receives and to which the participant sends messages
+    private List<TopicSink> topicSinks;
     private List<TopicSource> topicSources;
 
     ParticipantIntermediaryApi participantIntermediaryApi;
 
+    private final MessageTypeDispatcher msgDispatcher;
+
     /**
      * Instantiate the activator for participant.
      *
-     * @param applicationContext ApplicationContext
      * @param parameters the ParticipantParameters
+     * @param publishers list of Publishers
+     * @param listeners list of Listeners
      */
-    public IntermediaryActivator(final ApplicationContext applicationContext, final ParticipantParameters parameters,
-            ParticipantIntermediaryApi participantIntermediaryApi) {
-        this.applicationContext = applicationContext;
+    public IntermediaryActivator(final ParticipantParameters parameters,
+            ParticipantIntermediaryApi participantIntermediaryApi, List<Publisher> publishers,
+            List<Listener> listeners) {
         this.participantIntermediaryApi = participantIntermediaryApi;
 
+        topicSinks = TopicEndpointManager.getManager()
+                .addTopicSinks(parameters.getIntermediaryParameters().getClampControlLoopTopics().getTopicSinks());
+
         topicSources = TopicEndpointManager.getManager()
                 .addTopicSources(parameters.getIntermediaryParameters().getClampControlLoopTopics().getTopicSources());
 
-        // @formatter:off
+        msgDispatcher = new MessageTypeDispatcher(MSG_TYPE_NAMES);
 
+        // @formatter:off
         addAction("Topic endpoint management",
-            () -> TopicEndpointManager.getManager().start(),
-            () -> TopicEndpointManager.getManager().shutdown());
+                () -> TopicEndpointManager.getManager().start(),
+                () -> TopicEndpointManager.getManager().shutdown());
+
+        publishers.forEach(publisher ->
+            addAction("Publisher " + publisher.getClass().getSimpleName(),
+                () -> publisher.active(topicSinks),
+                publisher::stop));
+
+        listeners.forEach(listener ->
+            addAction("Listener " + listener.getClass().getSimpleName(),
+                    () -> msgDispatcher.register(listener.getType(), listener.getScoListener()),
+                    () -> msgDispatcher.unregister(listener.getType())));
 
         addAction("Topic Message Dispatcher", this::registerMsgDispatcher, this::unregisterMsgDispatcher);
         // @formatter:on
@@ -117,26 +128,6 @@ public class IntermediaryActivator extends ServiceManagerContainer implements Cl
      * Registers the dispatcher with the topic source(s).
      */
     private void registerMsgDispatcher() {
-        MessageTypeDispatcher msgDispatcher = applicationContext.getBean(MessageTypeDispatcher.class);
-
-        msgDispatcher.register(ParticipantMessageType.PARTICIPANT_STATUS_REQ.name(),
-                applicationContext.getBean(ParticipantStatusReqListener.class));
-
-        msgDispatcher.register(ParticipantMessageType.CONTROL_LOOP_STATE_CHANGE.name(),
-                applicationContext.getBean(ControlLoopStateChangeListener.class));
-
-        msgDispatcher.register(ParticipantMessageType.CONTROL_LOOP_UPDATE.name(),
-                applicationContext.getBean(ControlLoopUpdateListener.class));
-
-        msgDispatcher.register(ParticipantMessageType.PARTICIPANT_REGISTER_ACK.name(),
-                applicationContext.getBean(ParticipantRegisterAckListener.class));
-
-        msgDispatcher.register(ParticipantMessageType.PARTICIPANT_DEREGISTER_ACK.name(),
-                applicationContext.getBean(ParticipantDeregisterAckListener.class));
-
-        msgDispatcher.register(ParticipantMessageType.PARTICIPANT_UPDATE.name(),
-                applicationContext.getBean(ParticipantUpdateListener.class));
-
         for (final TopicSource source : topicSources) {
             source.register(msgDispatcher);
         }
@@ -146,8 +137,6 @@ public class IntermediaryActivator extends ServiceManagerContainer implements Cl
      * Unregisters the dispatcher from the topic source(s).
      */
     private void unregisterMsgDispatcher() {
-        MessageTypeDispatcher msgDispatcher = applicationContext.getBean(MessageTypeDispatcher.class);
-
         for (final TopicSource source : topicSources) {
             source.unregister(msgDispatcher);
         }
@@ -155,6 +144,8 @@ public class IntermediaryActivator extends ServiceManagerContainer implements Cl
 
     @Override
     public void close() throws IOException {
-        super.shutdown();
+        if (isAlive()) {
+            super.shutdown();
+        }
     }
 }
diff --git a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/handler/Listener.java b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/handler/Listener.java
new file mode 100644
index 000000000..bca71afda
--- /dev/null
+++ b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/handler/Listener.java
@@ -0,0 +1,40 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Nordix Foundation.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.clamp.controlloop.participant.intermediary.handler;
+
+import org.onap.policy.common.endpoints.listeners.ScoListener;
+
+public interface Listener {
+
+    /**
+     * Get the type of message of interest to the listener.
+     *
+     * @return type of message of interest to the listener
+     */
+    String getType();
+
+    /**
+     * Get listener to register.
+     *
+     * @return listener to register
+     */
+    <T> ScoListener<T> getScoListener();
+}
diff --git a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/handler/ParticipantHandler.java b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/handler/ParticipantHandler.java
index 1947fda1a..66e09e7f6 100644
--- a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/handler/ParticipantHandler.java
+++ b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/handler/ParticipantHandler.java
@@ -43,6 +43,7 @@ import org.onap.policy.clamp.controlloop.models.controlloop.concepts.Participant
 import org.onap.policy.clamp.controlloop.models.controlloop.concepts.ParticipantStatistics;
 import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ControlLoopStateChange;
 import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ControlLoopUpdate;
+import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantAckMessage;
 import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantDeregister;
 import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantDeregisterAck;
 import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantMessage;
@@ -197,6 +198,16 @@ public class ParticipantHandler implements Closeable {
     }
 
     /**
+     * Check if a participant message applies to this participant handler.
+     *
+     * @param participantMsg the message to check
+     * @return true if it applies, false otherwise
+     */
+    public boolean appliesTo(ParticipantAckMessage participantMsg) {
+        return participantMsg.appliesTo(participantType, participantId);
+    }
+
+    /**
      * Method to send ParticipantRegister message to controlloop runtime.
      */
     public void sendParticipantRegister() {
diff --git a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/handler/Publisher.java b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/handler/Publisher.java
new file mode 100644
index 000000000..287d7c055
--- /dev/null
+++ b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/handler/Publisher.java
@@ -0,0 +1,34 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Nordix Foundation.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.clamp.controlloop.participant.intermediary.handler;
+
+import java.util.List;
+import org.onap.policy.common.endpoints.event.comm.TopicSink;
+
+/**
+ * Publisher.
+ */
+public interface Publisher {
+
+    void active(List<TopicSink> topicSinks);
+
+    void stop();
+}