1 files changed, 62 insertions, 0 deletions
diff --git a/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/api/ControlLoopElementListener.java b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/api/ControlLoopElementListener.java
new file mode 100644
index 000000000..9e5d2c663
--- /dev/null
+++ b/participant/participant-intermediary/src/main/java/org/onap/policy/clamp/controlloop/participant/intermediary/api/ControlLoopElementListener.java
@@ -0,0 +1,62 @@
+/*-
+ * ============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.api;
+
+import java.util.UUID;
+import org.onap.policy.clamp.controlloop.models.controlloop.concepts.ControlLoopElement;
+import org.onap.policy.clamp.controlloop.models.controlloop.concepts.ControlLoopOrderedState;
+import org.onap.policy.clamp.controlloop.models.controlloop.concepts.ControlLoopState;
+import org.onap.policy.models.base.PfModelException;
+import org.onap.policy.models.tosca.authorative.concepts.ToscaServiceTemplate;
+
+/**
+ * This interface is implemented by participant implementations to receive updates on control loop elements.
+ */
+public interface ControlLoopElementListener {
+    /**
+     * Handle a control loop element state change.
+     *
+     * @param controlLoopElementId the ID of the control loop element
+     * @param currentState the current state of the control loop element
+     * @param newState the state to which the control loop element is changing to
+     * @throws PfModelException in case of a model exception
+     */
+    public void controlLoopElementStateChange(UUID controlLoopElementId, ControlLoopState currentState,
+            ControlLoopOrderedState newState) throws PfModelException;
+
+    /**
+     * Handle an update on a control loop element.
+     *
+     * @param element the information on the control loop element
+     * @param controlLoopDefinition toscaServiceTemplate
+     * @throws PfModelException from Policy framework
+     */
+    public void controlLoopElementUpdate(ControlLoopElement element,
+            ToscaServiceTemplate controlLoopDefinition) throws PfModelException;
+
+    /**
+     * Handle controlLoopElement statistics.
+     *
+     * @param controlLoopElementId controlLoopElement id
+     * @throws PfModelException in case of a model exception
+     */
+    public void handleStatistics(UUID controlLoopElementId) throws PfModelException;
+}