+/*-
+ * ============LICENSE_START=======================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.pdpx.main.comm.listeners;
+
+import org.onap.policy.common.endpoints.event.comm.Topic.CommInfrastructure;
+import org.onap.policy.common.endpoints.event.comm.client.TopicSinkClient;
+import org.onap.policy.common.endpoints.event.comm.client.TopicSinkClientException;
+import org.onap.policy.common.endpoints.listeners.ScoListener;
+import org.onap.policy.common.utils.coder.StandardCoderObject;
+import org.onap.policy.models.pdp.concepts.PdpStateChange;
+import org.onap.policy.models.pdp.concepts.PdpStatus;
+import org.onap.policy.models.pdp.enums.PdpState;
+import org.onap.policy.pdpx.main.comm.XacmlPdpHeartbeatPublisher;
+import org.onap.policy.pdpx.main.comm.XacmlPdpMessage;
+import org.onap.policy.pdpx.main.startstop.XacmlPdpActivator;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class XacmlPdpStateChangeListener extends ScoListener<PdpStateChange> {
+
+ private static final Logger LOGGER = LoggerFactory.getLogger(XacmlPdpStateChangeListener.class);
+
+ private TopicSinkClient client;
+
+ private XacmlPdpHeartbeatPublisher heartbeat;
+
+ /**
+ * Constructs the object.
+ *
+ * @param client used to send back response after receiving state change message
+ */
+ public XacmlPdpStateChangeListener(TopicSinkClient client) {
+ super(PdpStateChange.class);
+ heartbeat = new XacmlPdpHeartbeatPublisher(client, PdpState.PASSIVE);
+ this.client = client;
+ }
+
+ @Override
+ public void onTopicEvent(CommInfrastructure infra, String topic, StandardCoderObject sco, PdpStateChange message) {
+
+ XacmlPdpMessage newMessage = new XacmlPdpMessage();
+ try {
+ PdpStatus newStatus = newMessage.formatStatusMessage(message.getState());
+
+ // Send State Change Status to PAP
+ if (!client.send(newStatus)) {
+ LOGGER.error("failed to send to topic sink " + client.getTopic());
+ throw new TopicSinkClientException("failed to send to topic sink " + client.getTopic());
+ }
+
+ // Update the heartbeat internal state if publisher is running else create new publisher
+ if (XacmlPdpHeartbeatPublisher.isAlive()) {
+ heartbeat.updateInternalState(message.getState());
+ } else {
+ heartbeat = new XacmlPdpHeartbeatPublisher(client, message.getState());
+ }
+
+ } catch (final Exception e) {
+ LOGGER.error("failed to handle the PDP State Change message.", e);
+ }
+
+ }
+}