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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 org.onap.dcaegen2.services.sonhms;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.onap.dcaegen2.services.sonhms.child.ChildThread;
import org.onap.dcaegen2.services.sonhms.child.Graph;
import org.onap.dcaegen2.services.sonhms.entity.ClusterDetails;
import org.onap.dcaegen2.services.sonhms.exceptions.ConfigDbNotFoundException;
import org.onap.dcaegen2.services.sonhms.model.FapServiceList;
import org.onap.dcaegen2.services.sonhms.model.Notification;
import org.onap.dcaegen2.services.sonhms.utils.ClusterUtils;
import org.onap.dcaegen2.services.sonhms.utils.ThreadUtils;
import fj.data.Either;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class EventHandler {
private static Logger log = LoggerFactory.getLogger(EventHandler.class);
private static Map<Long, ChildThread> childThreadMap = new HashMap<>();
private BlockingQueue<List<String>> childStatusQueue;
private Map<Long, String> childStatus;
private ExecutorService pool;
private ClusterUtils clusterUtils;
private ThreadUtils threadUtils;
/**
* Constructor.
*/
public EventHandler(BlockingQueue<List<String>> childStatusQueue, ExecutorService pool,
Map<Long, String> childStatus, ClusterUtils clusterUtils, ThreadUtils threadUtils) {
this.childStatusQueue = childStatusQueue;
this.childStatus = childStatus;
this.pool = pool;
this.clusterUtils = clusterUtils;
this.threadUtils = threadUtils;
}
/**
* handle sdnr notification.
*/
public Boolean handleSdnrNotification(Notification notification) {
// Check if notification matches with a cluster
try {
List<ClusterDetails> clusterDetails = clusterUtils.getAllClusters();
NotificationToClusterMapping mapping = new NotificationToClusterMapping();
mapping = clusterUtils.getClustersForNotification(notification, clusterDetails);
// Matching cells
System.out.println(mapping);
if (mapping.getCellsinCluster() != null) {
handleMatchingCells(mapping.getCellsinCluster(), clusterDetails);
}
// unmatched cells
if (mapping.getNewCells() != null) {
handleUnMatchingCells(mapping.getNewCells());
}
} catch (Exception e) {
log.error("Exception in sdnr notification handling {}", e);
return false;
}
return true;
}
private void handleUnMatchingCells(List<FapServiceList> newCells) {
List<Graph> newClusters = new ArrayList<>();
for (FapServiceList fapService : newCells) {
Either<Graph, Integer> existingCluster = clusterUtils.getClusterForCell(fapService, newClusters);
if (existingCluster.isRight()) {
try {
Graph cluster = clusterUtils.createCluster(fapService);
newClusters.add(cluster);
} catch (ConfigDbNotFoundException e) {
log.error("Error connecting with configDB {}", e);
}
}
else {
Graph cluster = existingCluster.left().value();
Graph modifiedCluster = clusterUtils.modifyCluster(cluster, fapService);
newClusters.remove(cluster);
newClusters.add(modifiedCluster);
}
}
// create new child thread
threadUtils.createNewThread(newClusters, childStatusQueue, pool, this);
}
private void handleMatchingCells(Map<FapServiceList, String> cellsInCluster, List<ClusterDetails> clusterDetails) {
for (Entry<FapServiceList, String> entry : cellsInCluster.entrySet()) {
FapServiceList fapService = entry.getKey();
String clusterId = entry.getValue();
Either<ClusterDetails, Integer> clusterDetail = clusterUtils.getClusterDetailsFromClusterId(clusterId,
clusterDetails);
if (clusterDetail.isRight()) {
log.error("Cannot find the cluster for Cluster ID");
return;
} else {
long threadId = clusterDetail.left().value().getChildThreadId();
if (childStatus.get(threadId).equals("triggeredOof")) {
log.info("OOF triggered for the cluster, buffering notification");
bufferNotification(fapService, clusterId);
} else {
childThreadMap.get(threadId).putInQueue(fapService);
}
}
}
}
private void bufferNotification(FapServiceList fapService, String clusterId) {
ObjectMapper mapper = new ObjectMapper();
BufferNotificationComponent bufferNotifComponent = new BufferNotificationComponent();
String serviceListString = "";
try {
serviceListString = mapper.writeValueAsString(fapService);
} catch (JsonProcessingException e) {
log.debug("JSON processing exception: {}", e);
}
bufferNotifComponent.bufferNotification(serviceListString, clusterId);
}
/**
* handle child status update.
*/
public void handleChildStatusUpdate(List<String> childStatus) {
// update Child status in data structure
Long childThreadId = Long.parseLong(childStatus.get(0));
addChildStatus(childThreadId, childStatus.get(1));
// if child status is OOF result success, handle buffered notifications
if (childStatus.get(1).equals("success")) {
BufferNotificationComponent bufferNotificationComponent = new BufferNotificationComponent();
ClusterDetailsComponent clusterDetailsComponent = new ClusterDetailsComponent();
String clusterId = clusterDetailsComponent.getClusterId(childThreadId);
List<String> bufferedNotifications = bufferNotificationComponent.getBufferedNotification(clusterId);
if (bufferedNotifications == null || bufferedNotifications.isEmpty()) {
log.info("No buffered notification for this thread");
Set<Thread> setOfThread = Thread.getAllStackTraces().keySet();
for (Thread thread : setOfThread) {
if (thread.getId() == childThreadId) {
deleteChildStatus(childThreadId);
thread.interrupt();
}
}
} else {
handleBufferedNotifications(childThreadId, bufferedNotifications);
}
}
// else kill the child thread
}
private void handleBufferedNotifications(Long childThreadId, List<String> bufferedNotifications) {
ObjectMapper mapper = new ObjectMapper();
for (String notification : bufferedNotifications) {
FapServiceList fapServiceList;
try {
fapServiceList = mapper.readValue(notification, FapServiceList.class);
log.debug("fapServiceList{}", fapServiceList);
childThreadMap.get(childThreadId).putInQueueWithNotify(fapServiceList);
} catch (IOException e) {
log.error("Error parsing the buffered notification, skipping {}", e);
}
}
}
public static void addChildThreadMap(Long childThreadId, ChildThread child) {
childThreadMap.put(childThreadId, child);
}
public static Map<Long, ChildThread> getChildThreadMap() {
return childThreadMap;
}
public void addChildStatus(Long threadId, String status) {
this.childStatus.put(threadId, status);
}
public String getChildStatus(Long threadId) {
return childStatus.get(threadId);
}
public void deleteChildStatus(Long childThreadId) {
this.childStatus.remove(childThreadId);
}
public ExecutorService getPool() {
return pool;
}
}
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