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/*******************************************************************************
* ============LICENSE_START=======================================================
* pcims
* ================================================================================
* Copyright (C) 2018 Wipro Limited.
* ==============================================================================
* 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 com.wipro.www.sonhms.dmaap;
import com.att.nsa.apiClient.http.HttpException;
import com.att.nsa.cambria.client.CambriaClient;
import com.att.nsa.cambria.client.CambriaClientBuilders;
import com.att.nsa.cambria.client.CambriaClientBuilders.ConsumerBuilder;
import com.att.nsa.cambria.client.CambriaClientBuilders.TopicManagerBuilder;
import com.att.nsa.cambria.client.CambriaConsumer;
import com.att.nsa.cambria.client.CambriaTopicManager;
import com.wipro.www.sonhms.Configuration;
import com.wipro.www.sonhms.NewNotification;
import com.wipro.www.sonhms.Topic;
import com.wipro.www.sonhms.dao.DmaapNotificationsRepository;
import com.wipro.www.sonhms.entity.DmaapNotifications;
import java.io.IOException;
import java.net.MalformedURLException;
import java.security.GeneralSecurityException;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class DmaapClient {
@Autowired
private DmaapNotificationsRepository dmaapNotificationsRepository;
private Configuration configuration;
private static Logger log = LoggerFactory.getLogger(DmaapClient.class);
private static final String CONSUMER = "CONSUMER";
private static final String PRODUCER = "PRODUCER";
private static final String DESCRIPTION = "api keys for OOF PCI use case";
private static final int PARTITION_COUNT = 1;
private static final int REPLICATION_COUNT = 1;
private NewNotification newNotification;
private CambriaTopicManager topicManager;
public class NotificationCallback {
DmaapClient dmaapClient;
public NotificationCallback(DmaapClient dmaapClient) {
this.dmaapClient = dmaapClient;
}
public void activateCallBack(String msg) {
handleNotification(msg);
}
private void handleNotification(String msg) {
DmaapNotifications dmaapNotification = new DmaapNotifications();
dmaapNotification.setNotification(msg);
if (log.isDebugEnabled()) {
log.debug(dmaapNotification.toString());
}
dmaapNotificationsRepository.save(dmaapNotification);
newNotification.setNewNotif(true);
}
}
/**
* init dmaap client.
*/
public void initClient(NewNotification newNotification) {
log.debug("initializing client");
configuration = Configuration.getInstance();
if (log.isDebugEnabled()) {
log.debug(configuration.toString());
}
this.newNotification = newNotification;
createAndConfigureTopics();
startClient();
}
/**
* create and configures topics.
*/
private void createAndConfigureTopics() {
try {
topicManager = buildCambriaClient(new TopicManagerBuilder().usingHosts(configuration.getServers())
.authenticatedBy(configuration.getManagerApiKey(), configuration.getManagerSecretKey()));
} catch (GeneralSecurityException | IOException e) {
log.debug("exception during creating topic", e);
}
List<Topic> topics = configuration.getTopics();
for (Topic topic : topics) {
Set<String> topicsInDmaap = getAllTopicsFromDmaap();
createTopic(topic, topicsInDmaap);
subscribeToTopic(topic.getName(), topic.getProducer(), PRODUCER);
subscribeToTopic(topic.getName(), topic.getConsumer(), CONSUMER);
}
topicManager.close();
}
/**
* create topic.
*/
private void createTopic(Topic topic, Set<String> topicsInDmaap) {
if (topicsInDmaap.contains(topic.getName())) {
log.debug("topic exists in dmaap");
} else {
try {
topicManager.createTopic(topic.getName(), DESCRIPTION, PARTITION_COUNT, REPLICATION_COUNT);
} catch (HttpException | IOException e) {
log.debug("error while creating topic: {}", e);
}
}
}
/**
* get all topics from dmaap.
*/
private Set<String> getAllTopicsFromDmaap() {
Set<String> topics = new HashSet<>();
try {
topics = topicManager.getTopics();
} catch (IOException e) {
log.debug("IOException while fetching topics");
}
return topics;
}
/**
* start dmaap client.
*/
private synchronized void startClient() {
ScheduledExecutorService executorPool;
CambriaConsumer cambriaConsumer = null;
try {
cambriaConsumer = new ConsumerBuilder()
.authenticatedBy(configuration.getPcimsApiKey(), configuration.getPcimsSecretKey())
.knownAs(configuration.getCg(), configuration.getCid()).onTopic(configuration.getSdnrTopic())
.usingHosts(configuration.getServers()).withSocketTimeout(configuration.getPollingTimeout() * 1000)
.build();
// create notification consumers for SNDR and policy
NotificationConsumer notificationConsumer = new NotificationConsumer(cambriaConsumer,
new NotificationCallback(this));
// start notification consumer threads
executorPool = Executors.newScheduledThreadPool(10);
executorPool.scheduleAtFixedRate(notificationConsumer, 0, configuration.getPollingInterval(),
TimeUnit.SECONDS);
} catch (MalformedURLException | GeneralSecurityException e) {
log.debug("exception during starting client", e);
}
}
/**
* subscribe to topic.
*/
private void subscribeToTopic(String topicName, String subscriberApiKey, String subscriberType) {
if (subscriberType.equals(PRODUCER)) {
try {
topicManager.allowProducer(topicName, subscriberApiKey);
} catch (HttpException | IOException e) {
log.debug("error while subscribing to a topic: {}", e);
}
} else if (subscriberType.equals(CONSUMER)) {
try {
topicManager.allowConsumer(topicName, subscriberApiKey);
} catch (HttpException | IOException e) {
log.debug("error while subscribing to a topic: {}", e);
}
}
}
@SuppressWarnings("unchecked")
private static <T extends CambriaClient> T buildCambriaClient(
CambriaClientBuilders.AbstractAuthenticatedManagerBuilder<? extends CambriaClient> client)
throws MalformedURLException, GeneralSecurityException {
return (T) client.build();
}
}
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