1 files changed, 74 insertions, 0 deletions
diff --git a/rulemgt/src/main/java/org/onap/holmes/rulemgt/tools/EngineTools.java b/rulemgt/src/main/java/org/onap/holmes/rulemgt/tools/EngineTools.java
new file mode 100644
index 0000000..4896bde
--- /dev/null
+++ b/rulemgt/src/main/java/org/onap/holmes/rulemgt/tools/EngineTools.java
@@ -0,0 +1,74 @@
+/**
+ * Copyright 2017-2020 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.tools;
+
+import lombok.extern.slf4j.Slf4j;
+import org.jvnet.hk2.annotations.Service;
+import org.onap.holmes.common.api.entity.CorrelationRule;
+import org.onap.holmes.common.engine.entity.EngineEntity;
+import org.onap.holmes.common.engine.service.EngineEntityService;
+import org.onap.holmes.rulemgt.wrapper.RuleQueryWrapper;
+
+import javax.inject.Inject;
+import java.util.Arrays;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.stream.Collectors;
+
+@Service
+@Slf4j
+public class EngineTools {
+
+    @Inject
+    private RuleQueryWrapper ruleQueryWrapper;
+    @Inject
+    private EngineEntityService engineEntityService;
+
+    public List<String> getInstanceList() {
+        List<EngineEntity> entities = engineEntityService.getAllEntities();
+        return entities.stream().map(EngineEntity::getIp).collect(Collectors.toList());
+    }
+
+    public List<String> getLegacyEngineInstances() {
+        return engineEntityService.getLegacyEngines();
+    }
+
+    public String getEngineWithLeastRules() {
+        LinkedHashMap<String, Integer> ruleNumInEachEngine = new LinkedHashMap<>();
+
+        try {
+            for (String ip : getInstanceList()) {
+                List<CorrelationRule> rules = ruleQueryWrapper.queryRuleByEngineInstance(ip);
+                if (rules != null) {
+                    ruleNumInEachEngine.put(ip, rules.size());
+                }
+            }
+        } catch (Exception e) {
+            log.error("getEngineWithLeastRules failed!" + e.getMessage());
+        }
+
+        Integer[] numOfRules = ruleNumInEachEngine.values().toArray(new Integer[0]);
+        Arrays.sort(numOfRules);
+
+        for (String ip : ruleNumInEachEngine.keySet()) {
+            if (ruleNumInEachEngine.get(ip) == numOfRules[0]) {
+                return ip;
+            }
+        }
+        return null;
+    }
+}