ilgrosso commented on code in PR #571:
URL: https://github.com/apache/syncope/pull/571#discussion_r1421355741


##########
core/provisioning-java/src/main/java/org/apache/syncope/core/provisioning/java/pushpull/LDAPMembershipPullActions.java:
##########
@@ -155,8 +156,10 @@ public void beforeUpdate(
         
groupDAO.findUMemberships(groupDAO.find(entity.getKey())).forEach(uMembership 
-> {
             Set<String> memb = 
membershipsBefore.get(uMembership.getLeftEnd().getKey());
             if (memb == null) {
-                memb = new HashSet<>();
-                membershipsBefore.put(uMembership.getLeftEnd().getKey(), memb);
+                memb = Collections.synchronizedSet(new HashSet<>());

Review Comment:
   This snippet should be replaced by using 
`ConcurrentHashMap#computeIfAbsent`, which involves declaring both maps as 
`ConcurrentMap` - see 
https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentMap.html#computeIfAbsent-K-java.util.function.Function-
   
   e.g.
   
   ```java
               Set<String> memb = membershipsBefore.computeIfAbsent(
                       uMembership.getLeftEnd().getKey(),
                       k -> Collections.synchronizedSet(new HashSet<>()));
               memb.add(entity.getKey());
   ```



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