1 files changed, 228 insertions, 0 deletions
diff --git a/rulemgt/src/main/java/org/onap/holmes/rulemgt/send/RuleAllocator.java b/rulemgt/src/main/java/org/onap/holmes/rulemgt/send/RuleAllocator.java
new file mode 100644
index 0000000..6779bf1
--- /dev/null
+++ b/rulemgt/src/main/java/org/onap/holmes/rulemgt/send/RuleAllocator.java
@@ -0,0 +1,228 @@
+/**
+ * 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);
+        }
+    }
+}