feat: let initiators withdraw running process instances

Co-authored-by: Cursor <cursoragent@cursor.com>

ordo-spring-boot-autoconfigure/src/main/java/com/jetlumen/ordo/spring/OrdoDefinitionLoader.java

@@ -3,6 +3,7 @@ package com.jetlumen.ordo.spring;
 import com.jetlumen.ordo.api.OrdoEngine;
 import com.jetlumen.ordo.api.ProcessDefinition;
 import com.jetlumen.ordo.api.ProcessDefinitionParser;
+import com.jetlumen.ordo.api.exception.DefinitionInUseException;
 import org.springframework.boot.ApplicationArguments;
 import org.springframework.boot.ApplicationRunner;
 import org.springframework.core.io.Resource;
@@ -48,7 +49,11 @@ public final class OrdoDefinitionLoader implements ApplicationRunner {
             } catch (RuntimeException e) {
                 throw new IllegalStateException("failed to parse ordo definition from " + describe(resource), e);
             }
-            engine.replace(definition);
+            try {
+                engine.replace(definition);
+            } catch (DefinitionInUseException ignored) {
+                // keep the stored graph while RUNNING instances still reference it
+            }
         }
     }
 

ordo-spring-boot-autoconfigure/src/test/java/com/jetlumen/ordo/spring/OrdoJdbcAutoConfigurationTest.java

@@ -111,6 +111,24 @@ class OrdoJdbcAutoConfigurationTest {
         });
     }
 
+    @Test
+    void keepsStoredDefinitionWhenReloadFindsRunningInstances() {
+        withDataSourceRunner.run(context -> {
+            OrdoEngine engine = context.getBean(OrdoEngine.class);
+            engine.replace(ProcessDefinition.linear("leave-request-routed", "stale", List.of(
+                    ApprovalStep.single("lead", "Lead approval", "lee"))));
+            engine.start("leave-request-routed", "alice");
+
+            context.getBean(OrdoDefinitionLoader.class).load();
+
+            ProcessDefinition definition = context.getBean(ProcessDefinitionRepository.class)
+                    .findById("leave-request-routed")
+                    .orElseThrow();
+            assertThat(definition.name()).isEqualTo("stale");
+            assertThat(definition.steps()).hasSize(1);
+        });
+    }
+
     @Test
     void honoursUserDefinedRoutingCondition() {
         withDataSourceRunner.withUserConfiguration(CustomRoutingConditionConfig.class)