caffeine cache max size should include value collection size

@@ -18,6 +18,7 @@ package org.thingsboard.server.dao.cache;
 import com.github.benmanes.caffeine.cache.Caffeine;
 import com.github.benmanes.caffeine.cache.RemovalCause;
 import com.github.benmanes.caffeine.cache.Ticker;
+import com.github.benmanes.caffeine.cache.Weigher;
 import lombok.Data;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
@@ -31,6 +32,7 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.TimeUnit;
@@ -64,8 +66,9 @@ public class CaffeineCacheConfiguration {
     private CaffeineCache buildCache(String name, CacheSpecs cacheSpec) {
         final Caffeine<Object, Object> caffeineBuilder
                 = Caffeine.newBuilder()
+                .weigher(collectionSafeWeigher())
+                .maximumWeight(cacheSpec.getMaxSize())
                 .expireAfterWrite(cacheSpec.getTimeToLiveInMinutes(), TimeUnit.MINUTES)
-                .maximumSize(cacheSpec.getMaxSize())
                 .ticker(ticker());
         return new CaffeineCache(name, caffeineBuilder.build());
     }
@@ -80,4 +83,12 @@ public class CaffeineCacheConfiguration {
         return new PreviousDeviceCredentialsIdKeyGenerator();
     }
 
+    private Weigher<? super Object, ? super Object> collectionSafeWeigher() {
+        return (Weigher<Object, Object>) (key, value) -> {
+            if(value instanceof Collection) {
+                return ((Collection) value).size();
+            }
+            return 1;
+        };
+    }
 }