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/**
* Copyright 2017 ZTE Corporation.
* <p>
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.
*/
package org.onap.holmes.rulemgt.send;
import lombok.extern.slf4j.Slf4j;
import org.glassfish.hk2.api.ServiceLocator;
import org.onap.holmes.common.api.entity.CorrelationRule;
import org.onap.holmes.common.dropwizard.ioc.utils.ServiceLocatorHolder;
import org.onap.holmes.common.exception.CorrelationException;
import org.onap.holmes.common.utils.DbDaoUtil;
import org.onap.holmes.rulemgt.bolt.enginebolt.EngineWrapper;
import org.onap.holmes.rulemgt.db.CorrelationRuleDao;
import org.onap.holmes.rulemgt.msb.EngineInsQueryTool;
import org.onap.holmes.rulemgt.wrapper.RuleMgtWrapper;
import org.onap.holmes.rulemgt.wrapper.RuleQueryWrapper;
import java.util.*;
@Slf4j
public class RuleAllocator {
public final static int ENABLE = 1;
private RuleMgtWrapper ruleMgtWrapper;
private RuleQueryWrapper ruleQueryWrapper;
private EngineWrapper engineWrapper;
private EngineInsQueryTool engineInsQueryTool;
private DbDaoUtil daoUtil;
private CorrelationRuleDao correlationRuleDao;
private int latestEngineInsNum = 0;
private List<String> existingEngineServiceIps = new ArrayList<>();
private List<String> latestEngineServiceIps = new ArrayList<>();
public RuleAllocator() {
ServiceLocator locator = ServiceLocatorHolder.getLocator();
ruleMgtWrapper = locator.getService(RuleMgtWrapper.class);
ruleQueryWrapper = locator.getService(RuleQueryWrapper.class);
engineWrapper = locator.getService(EngineWrapper.class);
engineInsQueryTool = locator.getService(EngineInsQueryTool.class);
daoUtil = locator.getService(DbDaoUtil.class);
initDaoUtilAndEngineIp();
}
private void initDaoUtilAndEngineIp() {
correlationRuleDao = daoUtil.getJdbiDaoByOnDemand(CorrelationRuleDao.class);
try {
existingEngineServiceIps = engineInsQueryTool.getInstanceList();
} catch (Exception e) {
log.warn("Failed to get the number of engine instances.", e);
}
}
public synchronized void allocateRules(List<String> latestEngineIps) throws Exception {
if (latestEngineIps == null) {
throw new NullPointerException("The parameter of " + this.getClass().getSimpleName()
+ ".allocateRules(List<String>) can not be null!");
}
latestEngineServiceIps = latestEngineIps;
latestEngineInsNum = latestEngineIps.size();
if (existingEngineServiceIps.size() < latestEngineInsNum) {
//extend
List<CorrelationRule> rules2Allocate = calculateRule(existingEngineServiceIps);
List<CorrelationRule> rules2Delete = copyList(rules2Allocate);
List<String> newInstanceIds = sortOutNewEngineInstances(latestEngineServiceIps, existingEngineServiceIps);
distributeRules(newInstanceIds, rules2Allocate);
cleanUpRulesFromEngines(rules2Delete, existingEngineServiceIps);
} else if (existingEngineServiceIps.size() > latestEngineInsNum) {
//destroy
List<String> destroyed = getDestroyedEngines(latestEngineServiceIps, existingEngineServiceIps);
distributeRules(getRemainingEngines(destroyed), reallocateRules(destroyed));
}
existingEngineServiceIps = latestEngineServiceIps;
}
private List<CorrelationRule> copyList(List<CorrelationRule> rules) {
List<CorrelationRule> ret = new ArrayList<>(rules.size());
for (CorrelationRule r : rules) {
ret.add((CorrelationRule) r.clone());
}
return ret;
}
// When the engine is expanding, the rules that need to be allocated are calculated.
private List<CorrelationRule> calculateRule(List<String> existingEngineIps) throws CorrelationException {
List<CorrelationRule> enabledRules = ruleQueryWrapper.queryRuleByEnable(ENABLE);
int ruleCount = 0;
if (enabledRules != null) {
ruleCount = enabledRules.size();
}
int count = ruleCount / latestEngineInsNum;
int remainder = ruleCount % latestEngineInsNum;
List<CorrelationRule> ret = new ArrayList<>();
for (String ip : existingEngineIps) {
List<CorrelationRule> rules = ruleQueryWrapper.queryRuleByEngineInstance(ip);
List<CorrelationRule> tmp = rules.subList(count + (remainder-- / existingEngineIps.size()), rules.size());
ret.addAll(tmp);
}
return ret;
}
// Rules that need to be allocated after the engine is destroyed
private List<CorrelationRule> reallocateRules(List<String> destroyIpList) throws CorrelationException {
List<CorrelationRule> rules = new ArrayList<>();
try {
if (destroyIpList != null) {
for (String ip : destroyIpList) {
rules.addAll(ruleQueryWrapper.queryRuleByEngineInstance(ip));
}
}
} catch (CorrelationException e) {
log.error("method reallocateRules get data from DB failed !", e);
}
return rules;
}
// Extended IP
private List<String> sortOutNewEngineInstances(List<String> newIps, List<String> oldIps) {
List<String> ret = new ArrayList<>();
for (String ip : newIps) {
if (!oldIps.contains(ip)) {
ret.add(ip);
}
}
return ret;
}
// Destroyed IP
private List<String> getDestroyedEngines(List<String> latest, List<String> existing) {
List<String> ret = new ArrayList<>();
for (String ip : existing) {
if (!latest.contains(ip)) {
ret.add(ip);
}
}
return ret;
}
// Residual IP after destruction
private List<String> getRemainingEngines(List<String> destroyed) {
List<String> ret = new ArrayList<>();
for (String ip : latestEngineServiceIps) {
if (!destroyed.contains(ip)) {
ret.add(ip);
}
}
return ret;
}
private void distributeRules(List<String> instanceIps, List<CorrelationRule> rules) throws CorrelationException {
List<String> sortedIps = sortIpByRuleNumDesc(instanceIps);
for (int i = 0, j = 0; j < rules.size(); i++, j++) {
int index = i % sortedIps.size();
String ip = sortedIps.get(index);
CorrelationRule rule = rules.get(j);
rule.setEngineInstance(ip);
allocateRule(rule, ip);
}
}
// Sorted by the number of rules each engine contains, in a descending order.
private List<String> sortIpByRuleNumDesc(List<String> ips) {
List<CorrelationRule> rules = null;
Map<String, Integer> ruleNumOfEngines = new HashMap();
try {
for (String ip : ips) {
rules = ruleQueryWrapper.queryRuleByEngineInstance(ip);
if (rules != null) {
ruleNumOfEngines.put(ip, rules.size());
}
}
} catch (Exception e) {
log.error("getEngineIp4AddRule failed !", e);
}
List<Map.Entry<String, Integer>> sortedEntries = new ArrayList<>(ruleNumOfEngines.entrySet());
Collections.sort(sortedEntries, (o1, o2) -> o2.getValue() - o1.getValue());
List<String> ret = new ArrayList<>();
for (Map.Entry<String, Integer> entry : sortedEntries) {
ret.add(entry.getKey());
}
return ret;
}
private void allocateRule(CorrelationRule rule, String ip) throws CorrelationException {
try {
ruleMgtWrapper.deployRule2Engine(rule, ip);
correlationRuleDao.updateRule(rule);
} catch (CorrelationException e) {
throw new CorrelationException("allocate Deploy Rule failed", e);
}
}
private void cleanUpRulesFromEngines(List<CorrelationRule> rules, List<String> ipList) {
try {
for (String ip : ipList) {
for (CorrelationRule rule : rules) {
if (ip.equals(rule.getEngineInstance())) {
engineWrapper.deleteRuleFromEngine(rule.getPackageName(), ip);
}
}
}
} catch (CorrelationException e) {
log.error("When the engine is extended, deleting rule failed", e);
}
}
}
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