1 files changed, 144 insertions, 0 deletions
diff --git a/dcae-analytics-cdap-common/src/main/java/org/openecomp/dcae/apod/analytics/cdap/common/utils/DMaaPMRUtils.java b/dcae-analytics-cdap-common/src/main/java/org/openecomp/dcae/apod/analytics/cdap/common/utils/DMaaPMRUtils.java
new file mode 100644
index 0000000..37acf9c
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+++ b/dcae-analytics-cdap-common/src/main/java/org/openecomp/dcae/apod/analytics/cdap/common/utils/DMaaPMRUtils.java
@@ -0,0 +1,144 @@
+/*
+ * ===============================LICENSE_START======================================
+ *  dcae-analytics
+ * ================================================================================
+ *    Copyright © 2017 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.
+ *  ============================LICENSE_END===========================================
+ */
+
+package org.openecomp.dcae.apod.analytics.cdap.common.utils;
+
+import co.cask.cdap.api.metrics.Metrics;
+import com.google.common.base.Optional;
+import com.google.common.base.Stopwatch;
+import org.openecomp.dcae.apod.analytics.cdap.common.CDAPMetricsConstants;
+import org.openecomp.dcae.apod.analytics.common.exception.DCAEAnalyticsRuntimeException;
+import org.openecomp.dcae.apod.analytics.common.utils.HTTPUtils;
+import org.openecomp.dcae.apod.analytics.dmaap.domain.response.DMaaPMRSubscriberResponse;
+import org.openecomp.dcae.apod.analytics.dmaap.service.subscriber.DMaaPMRSubscriber;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.List;
+
+/**
+ * Utility common methods for DMaaP MR functionality
+ *
+ * @author Rajiv Singla . Creation Date: 2/6/2017.
+ */
+public abstract class DMaaPMRUtils {
+
+    private static final Logger LOG = LoggerFactory.getLogger(DMaaPMRUtils.class);
+
+    private DMaaPMRUtils() {
+        // private constructor
+    }
+
+
+    /**
+     * Returns messages fetched from DMaaP MR Subscriber.
+     *
+     * @param subscriber DMaaP MR Subscriber instance
+     * @param metrics CDAP metrics
+     *
+     * @return messages fetched from DMaaP MR topic
+     */
+    public static Optional<List<String>> getSubscriberMessages(final DMaaPMRSubscriber subscriber,
+                                                               final Metrics metrics) {
+
+        final Optional<DMaaPMRSubscriberResponse> subscriberResponseOptional =
+                getSubscriberResponse(subscriber, metrics);
+
+        // If response is not present, unable to proceed
+        if (!subscriberResponseOptional.isPresent()) {
+            return Optional.absent();
+        }
+
+        final DMaaPMRSubscriberResponse subscriberResponse = subscriberResponseOptional.get();
+
+        // If response code return by the subscriber call is not successful, unable to do proceed
+        if (!HTTPUtils.isSuccessfulResponseCode(subscriberResponse.getResponseCode())) {
+            LOG.error("Subscriber was unable to fetch messages properly.Subscriber Response Code: {} " +
+                    "Unable to proceed further....", subscriberResponse.getResponseCode());
+            metrics.count(CDAPMetricsConstants.DMAAP_MR_SUBSCRIBER_UNSUCCESSFUL_RESPONSES_METRIC, 1);
+            return Optional.absent();
+        }
+
+        LOG.debug("Subscriber HTTP Response Status Code match successful:  {}", subscriberResponse,
+                HTTPUtils.HTTP_SUCCESS_STATUS_CODE);
+
+        final List<String> actualMessages = subscriberResponse.getFetchedMessages();
+
+        // If there are no message returned during from Subscriber, nothing to write to CDAP Stream
+        if (actualMessages.isEmpty()) {
+            LOG.debug("Subscriber Response has no messages. Nothing to write....");
+            metrics.count(CDAPMetricsConstants.DMAAP_MR_SUBSCRIBER_RESPONSES_WITH_NO_MESSAGES_METRIC, 1);
+            return Optional.absent();
+        }
+
+        LOG.debug("DMaaP MR Subscriber found new messages in DMaaP Topic. Message count: {}", actualMessages.size());
+        metrics.count(CDAPMetricsConstants.DMAAP_MR_SUBSCRIBER_TOTAL_MESSAGES_PROCESSED_METRIC, actualMessages.size());
+
+        return Optional.of(actualMessages);
+
+    }
+
+
+    /**
+     * Get Subscriber response and records time taken to fetch messages. Returns Optional.None if Subscriber response
+     * is null or response status code is not present
+     *
+     * @param subscriber - DMaaP Subscriber
+     * @param metrics - CDAP Metrics collector
+     *
+     * @return - Optional of Subscriber Response
+     */
+    public static Optional<DMaaPMRSubscriberResponse> getSubscriberResponse(final DMaaPMRSubscriber subscriber,
+                                                                            final Metrics metrics) {
+
+        // Record all response count from subscriber
+        metrics.count(CDAPMetricsConstants.DMAAP_MR_SUBSCRIBER_ALL_RESPONSES_COUNT_METRIC, 1);
+
+        // Check how long it took for subscriber to respond
+        final Stopwatch stopwatch = new Stopwatch();
+        stopwatch.start();
+
+        // Fetch messages from DMaaP MR Topic
+        DMaaPMRSubscriberResponse subscriberResponse = null;
+        try {
+            subscriberResponse = subscriber.fetchMessages();
+        } catch (DCAEAnalyticsRuntimeException e) {
+            LOG.error("Error while fetching messages for DMaaP MR Topic: {}", e);
+        }
+
+        stopwatch.stop();
+        final long subscriberResponseTimeMS = stopwatch.elapsedMillis();
+
+        // If response is null is null or response code is null, unable to proceed nothing to do
+        if (subscriberResponse == null || subscriberResponse.getResponseCode() == null) {
+            LOG.error("Subscriber Response is null or subscriber Response code is null. Unable to proceed further...");
+            return Optional.absent();
+        }
+
+        LOG.debug("Subscriber Response:{}, Subscriber HTTP Response Status Code {}, Subscriber Response Time(ms): {}",
+                subscriberResponse, subscriberResponse.getResponseCode(), subscriberResponseTimeMS);
+
+        // Record subscriber response time
+        metrics.gauge(CDAPMetricsConstants.DMAAP_MR_SUBSCRIBER_RESPONSE_TIME_MS_METRIC, subscriberResponseTimeMS);
+
+        return Optional.of(subscriberResponse);
+    }
+
+}