1 files changed, 89 insertions, 0 deletions
diff --git a/cps-service/src/main/java/org/onap/cps/notification/NotificationService.java b/cps-service/src/main/java/org/onap/cps/notification/NotificationService.java
new file mode 100644
index 000000000..e97e8a3d8
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+++ b/cps-service/src/main/java/org/onap/cps/notification/NotificationService.java
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+
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Bell Canada. 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.cps.notification;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+
+@Service
+@Slf4j
+public class NotificationService {
+
+    private boolean dataUpdatedEventNotificationEnabled;
+    private NotificationPublisher notificationPublisher;
+    private CpsDataUpdatedEventFactory cpsDataUpdatedEventFactory;
+    private NotificationErrorHandler notificationErrorHandler;
+
+    /**
+     * Create an instance of Notification Subscriber.
+     *
+     * @param dataUpdatedEventNotificationEnabled   notification can be enabled by setting
+     *                                              'notification.data-updated.enabled=true' in application properties
+     * @param notificationPublisher                 notification Publisher
+     * @param cpsDataUpdatedEventFactory            to create CPSDataUpdatedEvent
+     * @param notificationErrorHandler              error handler
+     */
+    @Autowired
+    public NotificationService(
+        @Value("${notification.data-updated.enabled}") final boolean dataUpdatedEventNotificationEnabled,
+        final NotificationPublisher notificationPublisher,
+        final CpsDataUpdatedEventFactory cpsDataUpdatedEventFactory,
+        final NotificationErrorHandler notificationErrorHandler) {
+        this.dataUpdatedEventNotificationEnabled = dataUpdatedEventNotificationEnabled;
+        this.notificationPublisher = notificationPublisher;
+        this.cpsDataUpdatedEventFactory = cpsDataUpdatedEventFactory;
+        this.notificationErrorHandler = notificationErrorHandler;
+    }
+
+    /**
+     * Process Data Updated Event and publishes the notification.
+     *
+     * @param dataspaceName dataspace name
+     * @param anchorName    anchor name
+     */
+    public void processDataUpdatedEvent(final String dataspaceName, final String anchorName) {
+        log.debug("process data updated event for dataspace '{}' & anchor '{}'", dataspaceName, anchorName);
+        try {
+            if (shouldSendNotification()) {
+                final var cpsDataUpdatedEvent =
+                    cpsDataUpdatedEventFactory.createCpsDataUpdatedEvent(dataspaceName, anchorName);
+                log.debug("data updated event to be published {}", cpsDataUpdatedEvent);
+                notificationPublisher.sendNotification(cpsDataUpdatedEvent);
+            }
+        } catch (final Exception exception) {
+            /* All the exceptions are handled to not to propagate it to caller.
+               CPS operation should not fail if sending event fails for any reason.
+             */
+            notificationErrorHandler.onException("Failed to process cps-data-updated-event.",
+                exception, dataspaceName, anchorName);
+        }
+    }
+
+    /*
+        Add more complex rules based on dataspace and anchor later
+     */
+    private boolean shouldSendNotification() {
+        return dataUpdatedEventNotificationEnabled;
+    }
+
+}