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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.onap.dcae.apod.analytics.cdap.plugins.streaming.dmaap;
import co.cask.cdap.api.data.format.StructuredRecord;
import co.cask.cdap.api.metrics.Metrics;
import com.google.common.base.Optional;
import org.apache.spark.storage.StorageLevel;
import org.apache.spark.streaming.receiver.Receiver;
import org.onap.dcae.apod.analytics.cdap.common.utils.DMaaPMRUtils;
import org.onap.dcae.apod.analytics.cdap.plugins.domain.config.dmaap.DMaaPMRSourcePluginConfig;
import org.onap.dcae.apod.analytics.cdap.plugins.utils.CDAPPluginUtils;
import org.onap.dcae.apod.analytics.cdap.plugins.utils.DMaaPSourceConfigMapper;
import org.onap.dcae.apod.analytics.common.exception.DCAEAnalyticsRuntimeException;
import org.onap.dcae.apod.analytics.dmaap.DMaaPMRFactory;
import org.onap.dcae.apod.analytics.dmaap.service.subscriber.DMaaPMRSubscriber;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.List;
import java.util.concurrent.TimeUnit;
/**
* DMaaP MR Receiver which calls DMaaP MR Topic and stores structured records
* <p>
* @author Rajiv Singla . Creation Date: 1/19/2017.
*/
public class DMaaPMRReceiver extends Receiver<StructuredRecord> {
private static final Logger LOG = LoggerFactory.getLogger(DMaaPMRReceiver.class);
private static final long serialVersionUID = 1L;
private final DMaaPMRSourcePluginConfig pluginConfig;
private final transient Metrics metrics;
public DMaaPMRReceiver(final StorageLevel storageLevel, final DMaaPMRSourcePluginConfig pluginConfig,
final Metrics metrics) {
super(storageLevel);
this.pluginConfig = pluginConfig;
this.metrics = metrics;
LOG.debug("Created DMaaP MR Receiver instance with plugin Config: {}", pluginConfig);
}
@Override
public void onStart() {
// create DMaaP MR Subscriber
final DMaaPMRSubscriber subscriber =
DMaaPMRFactory.create().createSubscriber(DMaaPSourceConfigMapper.map(pluginConfig));
// Start a new thread with indefinite loop until receiver is stopped
new Thread() {
@Override
public void run() {
while (!isStopped()) {
storeStructuredRecords(subscriber);
try {
final Integer pollingInterval = pluginConfig.getPollingInterval();
LOG.debug("DMaaP MR Receiver sleeping for polling interval: {}", pollingInterval);
TimeUnit.MILLISECONDS.sleep(pollingInterval);
} catch (InterruptedException e) {
final String errorMessage = String.format(
"Interrupted Exception while DMaaP MR Receiver sleeping polling interval: %s", e);
throw new DCAEAnalyticsRuntimeException(errorMessage, LOG, e);
}
}
}
}.start();
}
@Override
public void onStop() {
LOG.debug("Stopping DMaaP MR Receiver with plugin config: {}", pluginConfig);
}
/**
* Fetches records from DMaaP MR Subscriber and store them as structured records
*
* @param subscriber DMaaP MR Subscriber Instance
*/
public void storeStructuredRecords(final DMaaPMRSubscriber subscriber) {
LOG.debug("DMaaP MR Receiver start fetching messages from DMaaP MR Topic");
// Fetch messages from DMaaP MR Topic
final Optional<List<String>> subscriberMessagesOptional =
DMaaPMRUtils.getSubscriberMessages(subscriber, metrics);
// store records
if (subscriberMessagesOptional.isPresent()) {
final List<String> messages = subscriberMessagesOptional.get();
for (final String message : messages) {
store(CDAPPluginUtils.createDMaaPMRResponseStructuredRecord(message));
}
LOG.debug("Stored DMaaP Subscriber messages as Structured Records. Message count {}", messages.size());
}
}
}
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