Add computed attributes priority

schema/changelog-6.2.xml

@@ -11,6 +11,12 @@
     <dropColumn tableName="tc_servers" columnName="twelvehourformat" />
     <dropColumn tableName="tc_users" columnName="twelvehourformat" />
 
+    <addColumn tableName="tc_attributes">
+      <column name="priority" type="INT" defaultValueNumeric="0">
+        <constraints nullable="false" />
+      </column>
+    </addColumn>
+
   </changeSet>
 
 </databaseChangeLog>

src/main/java/org/traccar/handler/ComputedAttributesHandler.java

@@ -35,13 +35,14 @@ import org.traccar.session.cache.CacheManager;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.util.Arrays;
-import java.util.Collection;
 import java.util.Collections;
+import java.util.Comparator;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.Date;
+import java.util.stream.Collectors;
 
 public class ComputedAttributesHandler extends BasePositionHandler {
 
@@ -140,7 +141,9 @@ public class ComputedAttributesHandler extends BasePositionHandler {
 
     @Override
     public void handlePosition(Position position, Callback callback) {
-        Collection<Attribute> attributes = cacheManager.getDeviceObjects(position.getDeviceId(), Attribute.class);
+        var attributes = cacheManager.getDeviceObjects(position.getDeviceId(), Attribute.class).stream()
+                .sorted(Comparator.comparing(Attribute::getPriority).reversed())
+                .collect(Collectors.toUnmodifiableList());
         for (Attribute attribute : attributes) {
             if (attribute.getAttribute() != null) {
                 Object result = null;

src/main/java/org/traccar/model/Attribute.java

@@ -61,4 +61,14 @@ public class Attribute extends BaseModel {
         this.type = type;
     }
 
+    private int priority;
+
+    public int getPriority() {
+        return priority;
+    }
+
+    public void setPriority(int priority) {
+        this.priority = priority;
+    }
+
 }