1 files changed, 165 insertions, 0 deletions
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
new file mode 100644
index 000000000..be2fa1a30
--- /dev/null
+++ b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/handler/IntermediaryActivator.java
@@ -0,0 +1,165 @@
+/*-
+ * ============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 java.util.concurrent.atomic.AtomicReference;
+import javax.ws.rs.core.Response.Status;
+import lombok.Getter;
+import lombok.experimental.Delegate;
+import org.onap.policy.clamp.controlloop.common.exception.ControlLoopRuntimeException;
+import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantControlLoopStateChange;
+import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantControlLoopUpdate;
+import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantHealthCheck;
+import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantMessageType;
+import org.onap.policy.clamp.controlloop.models.messages.dmaap.participant.ParticipantStateChange;
+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.ParticipantHealthCheckListener;
+import org.onap.policy.clamp.controlloop.participant.intermediary.comm.ParticipantStateChangeListener;
+import org.onap.policy.clamp.controlloop.participant.intermediary.comm.ParticipantStatusPublisher;
+import org.onap.policy.clamp.controlloop.participant.intermediary.parameters.ParticipantIntermediaryParameters;
+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.endpoints.listeners.ScoListener;
+import org.onap.policy.common.utils.services.ServiceManagerContainer;
+
+/**
+ * This class activates the Participant Intermediary together with all its handlers.
+ */
+public class IntermediaryActivator extends ServiceManagerContainer {
+    // Name of the message type for messages on topics
+    private static final String[] MSG_TYPE_NAMES = {"messageType"};
+
+    @Getter
+    private final ParticipantIntermediaryParameters parameters;
+
+    // Topics from which the participant receives and to which the participant sends messages
+    private List<TopicSink> topicSinks;
+    private List<TopicSource> topicSources;
+
+    // The participant handler for this intermediary
+    final AtomicReference<ParticipantHandler> participantHandler = new AtomicReference<>();
+
+    /**
+     * Listens for messages on the topic, decodes them into a message, and then dispatches them.
+     */
+    private final MessageTypeDispatcher msgDispatcher;
+
+    /**
+     * Instantiate the activator for participant.
+     *
+     * @param parameters the parameters for the participant intermediary
+     */
+    public IntermediaryActivator(final ParticipantIntermediaryParameters parameters) {
+        this.parameters = parameters;
+
+        topicSinks =
+                TopicEndpointManager.getManager().addTopicSinks(parameters.getClampControlLoopTopics().getTopicSinks());
+
+        topicSources = TopicEndpointManager.getManager()
+                .addTopicSources(parameters.getClampControlLoopTopics().getTopicSources());
+
+        try {
+            this.msgDispatcher = new MessageTypeDispatcher(MSG_TYPE_NAMES);
+        } catch (final RuntimeException e) {
+            throw new ControlLoopRuntimeException(Status.INTERNAL_SERVER_ERROR,
+                    "topic message dispatcher failed to start", e);
+        }
+
+        // @formatter:off
+        final AtomicReference<ParticipantStatusPublisher>     statusPublisher                = new AtomicReference<>();
+        final AtomicReference<ParticipantStateChangeListener> participantStateChangeListener = new AtomicReference<>();
+        final AtomicReference<ParticipantHealthCheckListener> participantHealthCheckListener = new AtomicReference<>();
+        final AtomicReference<ControlLoopStateChangeListener> controlLoopStateChangeListener = new AtomicReference<>();
+        final AtomicReference<ControlLoopUpdateListener>      controlLoopUpdateListener      = new AtomicReference<>();
+
+        addAction("Topic endpoint management",
+            () -> TopicEndpointManager.getManager().start(),
+            () -> TopicEndpointManager.getManager().shutdown());
+
+        addAction("Participant Status Publisher",
+            () -> statusPublisher.set(new ParticipantStatusPublisher(topicSinks)),
+            () -> statusPublisher.get().close());
+
+        addAction("Participant Handler",
+            () -> participantHandler.set(new ParticipantHandler(parameters, statusPublisher.get())),
+            () -> participantHandler.get().close());
+
+        addAction("Participant State Change Listener",
+            () -> participantStateChangeListener.set(new ParticipantStateChangeListener(participantHandler.get())),
+            () -> participantStateChangeListener.get().close());
+
+        addAction("Participant Health Check Listener",
+            () -> participantHealthCheckListener.set(new ParticipantHealthCheckListener(participantHandler.get())),
+            () -> participantHealthCheckListener.get().close());
+
+        addAction("Control Loop State Change Listener",
+            () -> controlLoopStateChangeListener.set(new ControlLoopStateChangeListener(participantHandler.get())),
+            () -> controlLoopStateChangeListener.get().close());
+
+        addAction("Control Loop Update Listener",
+            () -> controlLoopUpdateListener.set(new ControlLoopUpdateListener(participantHandler.get())),
+            () -> controlLoopUpdateListener.get().close());
+
+        addAction("Topic Message Dispatcher", this::registerMsgDispatcher, this::unregisterMsgDispatcher);
+        // @formatter:on
+    }
+
+    /**
+     * Registers the dispatcher with the topic source(s).
+     */
+    private void registerMsgDispatcher() {
+        msgDispatcher.register(ParticipantMessageType.PARTICIPANT_STATE_CHANGE.name(),
+                (ScoListener<ParticipantStateChange>) new ParticipantStateChangeListener(
+                 participantHandler.get()));
+        msgDispatcher.register(ParticipantMessageType.PARTICIPANT_HEALTH_CHECK.name(),
+                (ScoListener<ParticipantHealthCheck>) new ParticipantHealthCheckListener(
+                 participantHandler.get()));
+        msgDispatcher.register(ParticipantMessageType.PARTICIPANT_CONTROL_LOOP_STATE_CHANGE.name(),
+                (ScoListener<ParticipantControlLoopStateChange>) new ControlLoopStateChangeListener(
+                 participantHandler.get()));
+        msgDispatcher.register(ParticipantMessageType.PARTICIPANT_CONTROL_LOOP_UPDATE.name(),
+                (ScoListener<ParticipantControlLoopUpdate>) new ControlLoopUpdateListener(
+                 participantHandler.get()));
+        for (final TopicSource source : topicSources) {
+            source.register(msgDispatcher);
+        }
+    }
+
+    /**
+     * Unregisters the dispatcher from the topic source(s).
+     */
+    private void unregisterMsgDispatcher() {
+        for (final TopicSource source : topicSources) {
+            source.unregister(msgDispatcher);
+        }
+    }
+
+    /**
+     * Return the participant handler.
+     */
+    public ParticipantHandler getParticipantHandler() {
+        return participantHandler.get();
+    }
+}