exceptionfactory commented on code in PR #6314:
URL: https://github.com/apache/nifi/pull/6314#discussion_r950407648
##########
nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-components/src/main/java/org/apache/nifi/groups/StandardProcessGroup.java:
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@@ -971,6 +978,50 @@ public void addProcessor(final ProcessorNode processor) {
}
}
+ /**
+ * A component's Versioned Component ID is used to link a component on the
canvas to a component in a versioned flow.
+ * There may, however, be multiple instances of the same versioned flow in
a single NiFi instance. In this case, we will have
+ * multiple components with the same Versioned Component ID. This is
acceptable as long as no two components within the same Process Group
+ * have the same Versioned Component ID. However, it is not acceptable to
have two components within the same Process Group that have the same
+ * Versioned Component ID. If this happens, we will have no way to know
which component in our flow maps to which component in the versioned flow.
+ * We don't have an issue with this when a flow is imported, etc. because
it is always imported to a new Process Group. However, because it's possible
+ * to move most components between groups, we can have a situation in
which a component is moved to a higher group, and that can result in a conflict.
+ * In such a case, we handle this by nulling out the Versioned Component
ID if there is a conflict. This essentially makes NiFi behave as if a component
+ * is copied & pasted instead of being moved whenever a conflict occurs.
+ *
+ * @param component the component whose Versioned Component ID should be
nulled if there's a conflict
+ * @param componentsToCheck the components to check to determine if
there's a conflict
+ */
+ private void ensureUniqueVersionControlId(final
org.apache.nifi.components.VersionedComponent component,
+ final Collection<? extends
org.apache.nifi.components.VersionedComponent> componentsToCheck) {
+ final Optional<String> optionalVersionControlId =
component.getVersionedComponentId();
+ if (!optionalVersionControlId.isPresent()) {
+ return;
+ }
+
+ final String versionControlId = optionalVersionControlId.get();
+ final boolean duplicateId =
containsVersionedComponentId(componentsToCheck, versionControlId);
+
+ if (duplicateId) {
+ LOG.debug("Adding {} to {}, found conflicting Version Component ID
{} so marking Version Component ID of {} as null", component, this,
versionControlId, component);
+ setVersionedComponentId(null);
Review Comment:
This line sets the `versionedComponentId` of the ProcessGroup to `null`, as
opposed to setting the `versionedComponentId` of the `VersionedComponent` to
`null`, which causes the new test in `StandardProcessGroupIT` to fail.
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