thingsboard-developers

diff --git a/application/src/main/java/org/thingsboard/server/actors/rule/SimpleRuleActorChain.java b/application/src/main/java/org/thingsboard/server/actors/rule/SimpleRuleActorChain.java
index 8112ac4..5a8b20a 100644
--- a/application/src/main/java/org/thingsboard/server/actors/rule/SimpleRuleActorChain.java
+++ b/application/src/main/java/org/thingsboard/server/actors/rule/SimpleRuleActorChain.java
@@ -16,7 +16,6 @@
 package org.thingsboard.server.actors.rule;
 
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.List;
 import java.util.Set;
 
@@ -26,7 +25,7 @@ public class SimpleRuleActorChain implements RuleActorChain {
 
     public SimpleRuleActorChain(Set<RuleActorMetaData> ruleSet) {
         rules = new ArrayList<>(ruleSet);
-        Collections.sort(rules, RuleActorMetaData.RULE_ACTOR_MD_COMPARATOR);
+        rules.sort(RuleActorMetaData.RULE_ACTOR_MD_COMPARATOR);
     }
 
     public int size() {

diff --git a/application/src/main/java/org/thingsboard/server/actors/shared/AbstractContextAwareMsgProcessor.java b/application/src/main/java/org/thingsboard/server/actors/shared/AbstractContextAwareMsgProcessor.java
index 1c7f687..a3141ee 100644
--- a/application/src/main/java/org/thingsboard/server/actors/shared/AbstractContextAwareMsgProcessor.java
+++ b/application/src/main/java/org/thingsboard/server/actors/shared/AbstractContextAwareMsgProcessor.java
@@ -19,7 +19,6 @@ import akka.actor.ActorContext;
 import akka.actor.ActorRef;
 import akka.actor.Scheduler;
 import akka.event.LoggingAdapter;
-import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import lombok.AllArgsConstructor;

diff --git a/application/src/main/java/org/thingsboard/server/actors/shared/plugin/PluginManager.java b/application/src/main/java/org/thingsboard/server/actors/shared/plugin/PluginManager.java
index c0380d5..049accb 100644
--- a/application/src/main/java/org/thingsboard/server/actors/shared/plugin/PluginManager.java
+++ b/application/src/main/java/org/thingsboard/server/actors/shared/plugin/PluginManager.java
@@ -15,9 +15,9 @@
  */
 package org.thingsboard.server.actors.shared.plugin;
 
-import java.util.HashMap;
-import java.util.Map;
-
+import akka.actor.ActorContext;
+import akka.actor.ActorRef;
+import akka.actor.Props;
 import lombok.extern.slf4j.Slf4j;
 import org.thingsboard.server.actors.ActorSystemContext;
 import org.thingsboard.server.actors.plugin.PluginActor;
@@ -29,12 +29,9 @@ import org.thingsboard.server.common.data.page.PageDataIterable;
 import org.thingsboard.server.common.data.page.PageDataIterable.FetchFunction;
 import org.thingsboard.server.common.data.plugin.PluginMetaData;
 import org.thingsboard.server.dao.plugin.PluginService;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
-import akka.actor.ActorContext;
-import akka.actor.ActorRef;
-import akka.actor.Props;
+import java.util.HashMap;
+import java.util.Map;
 
 @Slf4j
 public abstract class PluginManager {
@@ -64,13 +61,9 @@ public abstract class PluginManager {
     abstract TenantId getTenantId();
 
     public ActorRef getOrCreatePluginActor(ActorContext context, PluginId pluginId) {
-        ActorRef pluginActor = pluginActors.get(pluginId);
-        if (pluginActor == null) {
-            pluginActor = context.actorOf(Props.create(new PluginActor.ActorCreator(systemContext, getTenantId(), pluginId))
-                    .withDispatcher(DefaultActorService.PLUGIN_DISPATCHER_NAME), pluginId.toString());
-            pluginActors.put(pluginId, pluginActor);
-        }
-        return pluginActor;
+        return pluginActors.computeIfAbsent(pluginId, pId ->
+                context.actorOf(Props.create(new PluginActor.ActorCreator(systemContext, getTenantId(), pId))
+                        .withDispatcher(DefaultActorService.PLUGIN_DISPATCHER_NAME), pId.toString()));
     }
 
     public void broadcast(Object msg) {

diff --git a/application/src/main/java/org/thingsboard/server/actors/shared/plugin/SystemPluginManager.java b/application/src/main/java/org/thingsboard/server/actors/shared/plugin/SystemPluginManager.java
index d8b58a0..a27e903 100644
--- a/application/src/main/java/org/thingsboard/server/actors/shared/plugin/SystemPluginManager.java
+++ b/application/src/main/java/org/thingsboard/server/actors/shared/plugin/SystemPluginManager.java
@@ -20,7 +20,6 @@ import org.thingsboard.server.common.data.id.TenantId;
 import org.thingsboard.server.common.data.page.PageDataIterable.FetchFunction;
 import org.thingsboard.server.common.data.plugin.PluginMetaData;
 import org.thingsboard.server.dao.plugin.BasePluginService;
-import org.thingsboard.server.dao.plugin.PluginService;
 
 public class SystemPluginManager extends PluginManager {
 
@@ -30,7 +29,7 @@ public class SystemPluginManager extends PluginManager {
 
     @Override
     FetchFunction<PluginMetaData> getFetchPluginsFunction() {
-        return link -> pluginService.findSystemPlugins(link);
+        return pluginService::findSystemPlugins;
     }
 
     @Override

diff --git a/application/src/main/java/org/thingsboard/server/actors/shared/rule/RuleManager.java b/application/src/main/java/org/thingsboard/server/actors/shared/rule/RuleManager.java
index 67d44e9..dfe3f44 100644
--- a/application/src/main/java/org/thingsboard/server/actors/shared/rule/RuleManager.java
+++ b/application/src/main/java/org/thingsboard/server/actors/shared/rule/RuleManager.java
@@ -18,8 +18,7 @@ package org.thingsboard.server.actors.shared.rule;
 import akka.actor.ActorContext;
 import akka.actor.ActorRef;
 import akka.actor.Props;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 import org.thingsboard.server.actors.ActorSystemContext;
 import org.thingsboard.server.actors.rule.RuleActor;
 import org.thingsboard.server.actors.rule.RuleActorChain;
@@ -38,10 +37,9 @@ import org.thingsboard.server.dao.rule.RuleService;
 
 import java.util.*;
 
+@Slf4j
 public abstract class RuleManager {
 
-    protected static final Logger logger = LoggerFactory.getLogger(RuleManager.class);
-
     protected final ActorSystemContext systemContext;
     protected final RuleService ruleService;
     protected final Map<RuleId, ActorRef> ruleActors;
@@ -63,11 +61,11 @@ public abstract class RuleManager {
         ruleMap = new HashMap<>();
 
         for (RuleMetaData rule : ruleIterator) {
-            logger.debug("[{}] Creating rule actor {}", rule.getId(), rule);
+            log.debug("[{}] Creating rule actor {}", rule.getId(), rule);
             ActorRef ref = getOrCreateRuleActor(context, rule.getId());
             RuleActorMetaData actorMd = RuleActorMetaData.systemRule(rule.getId(), rule.getWeight(), ref);
             ruleMap.put(rule, actorMd);
-            logger.debug("[{}] Rule actor created.", rule.getId());
+            log.debug("[{}] Rule actor created.", rule.getId());
         }
 
         refreshRuleChain();
@@ -79,8 +77,11 @@ public abstract class RuleManager {
             rule = systemContext.getRuleService().findRuleById(ruleId);
         }
         if (rule == null) {
-            rule = ruleMap.keySet().stream().filter(r -> r.getId().equals(ruleId)).findFirst().orElse(null);
-            rule.setState(ComponentLifecycleState.SUSPENDED);
+            rule = ruleMap.keySet().stream()
+                    .filter(r -> r.getId().equals(ruleId))
+                    .peek(r -> r.setState(ComponentLifecycleState.SUSPENDED))
+                    .findFirst()
+                    .orElse(null);
         }
         if (rule != null) {
             RuleActorMetaData actorMd = ruleMap.get(rule);
@@ -92,7 +93,7 @@ public abstract class RuleManager {
             refreshRuleChain();
             return Optional.of(actorMd.getActorRef());
         } else {
-            logger.warn("[{}] Can't process unknown rule!", rule.getId());
+            log.warn("[{}] Can't process unknown rule!", ruleId);
             return Optional.empty();
         }
     }
@@ -100,13 +101,9 @@ public abstract class RuleManager {
     abstract FetchFunction<RuleMetaData> getFetchRulesFunction();
 
     public ActorRef getOrCreateRuleActor(ActorContext context, RuleId ruleId) {
-        ActorRef ruleActor = ruleActors.get(ruleId);
-        if (ruleActor == null) {
-            ruleActor = context.actorOf(Props.create(new RuleActor.ActorCreator(systemContext, tenantId, ruleId))
-                    .withDispatcher(DefaultActorService.RULE_DISPATCHER_NAME), ruleId.toString());
-            ruleActors.put(ruleId, ruleActor);
-        }
-        return ruleActor;
+        return ruleActors.computeIfAbsent(ruleId, rId ->
+                context.actorOf(Props.create(new RuleActor.ActorCreator(systemContext, tenantId, rId))
+                        .withDispatcher(DefaultActorService.RULE_DISPATCHER_NAME), rId.toString()));
     }
 
     public RuleActorChain getRuleChain() {

diff --git a/application/src/main/java/org/thingsboard/server/actors/shared/rule/SystemRuleManager.java b/application/src/main/java/org/thingsboard/server/actors/shared/rule/SystemRuleManager.java
index 6d56832..7fac168 100644
--- a/application/src/main/java/org/thingsboard/server/actors/shared/rule/SystemRuleManager.java
+++ b/application/src/main/java/org/thingsboard/server/actors/shared/rule/SystemRuleManager.java
@@ -29,7 +29,7 @@ public class SystemRuleManager extends RuleManager {
 
     @Override
     FetchFunction<RuleMetaData> getFetchRulesFunction() {
-        return link -> ruleService.findSystemRules(link);
+        return ruleService::findSystemRules;
     }
 
 }