From 46d399ca877208f7bfe8091fb3c103ac81c90d19 Mon Sep 17 00:00:00 2001
From: Guillaume Nodet <gnodet@gmail.com>
Date: Thu, 7 May 2026 16:01:59 +0200
Subject: [PATCH 1/2] chore: conditionally enable OpenRewrite FQCN shortening
 in CI

Instead of always running OpenRewrite (which quadruples build time),
detect FQCNs in the diff and only enable -Prewrite when needed.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 etc/scripts/regen.sh | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/etc/scripts/regen.sh b/etc/scripts/regen.sh
index 5f4b75f2a69b0..302a90b678559 100755
--- a/etc/scripts/regen.sh
+++ b/etc/scripts/regen.sh
@@ -21,6 +21,31 @@ set -e
 # Move to top directory
 cd `dirname "$0"`/../..
 
+# Conditionally enable OpenRewrite FQCN shortening only when needed.
+# We diff HEAD~1 vs HEAD to check for FQCNs in the changeset.
+# For PR builds, actions/checkout creates a merge commit whose first parent (HEAD~1)
+# is the base branch tip, so the diff covers all PR changes.
+# For main builds, HEAD~1 is the previous (squash-merged) commit.
+# We only need --deepen=1 (depth 1 -> 2) since we compare adjacent commits,
+# not a merge-base (which would require deeper history).
+if ! git rev-parse HEAD~1 >/dev/null 2>&1; then
+  git fetch --deepen=1 --quiet 2>/dev/null || true
+fi
+
+if git rev-parse HEAD~1 >/dev/null 2>&1 && \
+   git diff HEAD~1 HEAD -- '*.java' ':!*/src/generated/*' \
+     | grep '^+[^+]' \
+     | grep -v '^+ *import ' \
+     | grep -v '^+ *package ' \
+     | grep -v '^+ *//' \
+     | grep -v '^+ *\*' \
+     | grep -qE '[a-z][a-z0-9]*(\.[a-z][a-z0-9]*)+\.[A-Z]'; then
+  MAVEN_EXTRA_ARGS="${MAVEN_EXTRA_ARGS} -Prewrite"
+  echo "FQCNs detected in diff, enabling OpenRewrite (-Prewrite)"
+else
+  echo "No FQCNs detected in diff, skipping OpenRewrite"
+fi
+
 # Force clean
 git clean -fdx
 rm -Rf **/src/generated/

From 0756a34af0762a1d042a62c52442e79d754b0407 Mon Sep 17 00:00:00 2001
From: Guillaume Nodet <gnodet@gmail.com>
Date: Thu, 7 May 2026 17:40:10 +0200
Subject: [PATCH 2/2] test: FQCN change to validate OpenRewrite is triggered
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

DO NOT MERGE — test PR to measure build time with OpenRewrite enabled.
---
 .../camel-api/src/main/java/org/apache/camel/CamelContext.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/core/camel-api/src/main/java/org/apache/camel/CamelContext.java b/core/camel-api/src/main/java/org/apache/camel/CamelContext.java
index 46700aa307513..41ce6008ebc08 100644
--- a/core/camel-api/src/main/java/org/apache/camel/CamelContext.java
+++ b/core/camel-api/src/main/java/org/apache/camel/CamelContext.java
@@ -85,6 +85,9 @@
  */
 public interface CamelContext extends CamelContextLifecycle, RuntimeConfiguration {
 
+    // TEST: this line SHOULD trigger OpenRewrite FQCN detection
+    java.util.List<String> testFqcnDetection = null;
+
     /**
      * Gets the {@link ExtendedCamelContext} that contains the extension points for internal context APIs. These APIs
      * are intended for internal usage within Camel and end-users should avoid using them.