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/*
* ===============================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);
}
}
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