TSK-1757: Added lock for update to custom attribute initialization.

common/taskana-common-test/src/main/java/pro/taskana/common/test/util/ParallelThreadHelper.java

@@ -8,6 +8,10 @@ import pro.taskana.common.api.exceptions.SystemException;
 
 public class ParallelThreadHelper {
 
+  private ParallelThreadHelper() {
+    throw new IllegalStateException("Utility class");
+  }
+
   public static void runInThread(Runnable runnable, int threadCount) throws Exception {
     Thread[] threads = new Thread[threadCount];
 

lib/taskana-core/src/main/java/pro/taskana/common/internal/ConfigurationMapper.java

@@ -14,8 +14,14 @@ public interface ConfigurationMapper {
   @Insert("INSERT INTO CONFIGURATION(ENFORCE_SECURITY) VALUES (#{securityEnabled})")
   void setSecurityEnabled(@Param("securityEnabled") boolean securityEnabled);
 
-  @Select("SELECT CUSTOM_ATTRIBUTES FROM CONFIGURATION")
+  @Select(
-  Map<String, Object> getAllCustomAttributes();
+      "<script> SELECT CUSTOM_ATTRIBUTES FROM CONFIGURATION "
+          + "<if test='lockForUpdate == true'>"
+          + "FETCH FIRST ROW ONLY FOR UPDATE "
+          + "<if test=\"_databaseId == 'db2'\">WITH RS USE AND KEEP UPDATE LOCKS </if> "
+          + "</if>"
+          + "</script>")
+  Map<String, Object> getAllCustomAttributes(boolean lockForUpdate);
 
   @Update("UPDATE CONFIGURATION SET CUSTOM_ATTRIBUTES = #{customAttributes}")
   void setAllCustomAttributes(@Param("customAttributes") Map<String, ?> customAttributes);

lib/taskana-core/src/main/java/pro/taskana/common/internal/ConfigurationServiceImpl.java

@@ -47,7 +47,7 @@ public class ConfigurationServiceImpl implements ConfigurationService {
     internalTaskanaEngine.executeInDatabaseConnection(
         CheckedRunnable.wrap(
             () -> {
-              if (mapper.getAllCustomAttributes() == null) {
+              if (mapper.getAllCustomAttributes(true) == null) {
                 if (LOGGER.isDebugEnabled()) {
                   LOGGER.debug("custom attributes are not set. Setting default value");
                 }
@@ -58,7 +58,8 @@ public class ConfigurationServiceImpl implements ConfigurationService {
 
   @Override
   public Map<String, Object> getAllCustomAttributes() {
-    return internalTaskanaEngine.executeInDatabaseConnection(mapper::getAllCustomAttributes);
+    return internalTaskanaEngine.executeInDatabaseConnection(
+        () -> mapper.getAllCustomAttributes(false));
   }
 
   @Override

lib/taskana-core/src/test/java/acceptance/config/ConfigurationServiceImplAccTest.java

@@ -41,7 +41,7 @@ public class ConfigurationServiceImplAccTest {
                       ConfigurationServiceImpl.class, "defaultCustomAttributes.json"))
               .toMap();
 
-      Map<String, Object> allCustomAttributes = configurationMapper.getAllCustomAttributes();
+      Map<String, Object> allCustomAttributes = configurationMapper.getAllCustomAttributes(false);
 
       assertThat(allCustomAttributes).isEqualTo(expectedCustomAttributes);
     }