From b392821c05e7bd0093651231fb800430d44fd6a0 Mon Sep 17 00:00:00 2001
From: Richard Richter <richard.richter@evolveum.com>
Date: Sun, 1 Mar 2020 08:55:27 +0100
Subject: [PATCH] reintroduced field-clearing on Spring test classes, moved to
 superclass

model-intest were indeed very slow, hopefully this helps (again)
---
 .../test/util/AbstractSpringTest.java         | 48 +++++++++++++++++++
 ...bstractConfiguredModelIntegrationTest.java | 44 -----------------
 2 files changed, 48 insertions(+), 44 deletions(-)

diff --git a/infra/test-util/src/main/java/com/evolveum/midpoint/test/util/AbstractSpringTest.java b/infra/test-util/src/main/java/com/evolveum/midpoint/test/util/AbstractSpringTest.java
index 49fe1a4def1..ab0fe6c306e 100644
--- a/infra/test-util/src/main/java/com/evolveum/midpoint/test/util/AbstractSpringTest.java
+++ b/infra/test-util/src/main/java/com/evolveum/midpoint/test/util/AbstractSpringTest.java
@@ -6,9 +6,13 @@
  */
 package com.evolveum.midpoint.test.util;
 
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+
 import org.jetbrains.annotations.NotNull;
 import org.springframework.test.context.testng.AbstractTestNGSpringContextTests;
 import org.testng.ITestResult;
+import org.testng.annotations.AfterClass;
 import org.testng.annotations.AfterMethod;
 import org.testng.annotations.BeforeMethod;
 
@@ -64,4 +68,48 @@ public String contextName() {
     public String getTestNameShort() {
         return TEST_CONTEXT_THREAD_LOCAL.get().getMethod().getMethodName();
     }
+
+    /**
+     * This method null all fields which are not static, final or primitive type.
+     * <p>
+     * All this is just to make GC work during DirtiesContext after every test class,
+     * because test class instances are not GCed immediately.
+     * If they hold autowired fields like sessionFactory (for example
+     * through SqlRepositoryService impl), their memory footprint is getting big.
+     * <p>
+     * Note that this does not work for components injected through constructor into
+     * final fields - if we need this cleanup, make the field non-final.
+     */
+    @AfterClass(alwaysRun = true)
+    protected void clearClassFields() throws Exception {
+        logger.trace("Clearing all fields for test class {}", getClass().getName());
+        clearClassFields(this, getClass());
+    }
+
+    private void clearClassFields(Object object, Class<?> forClass) throws Exception {
+        if (forClass.getSuperclass() != null) {
+            clearClassFields(object, forClass.getSuperclass());
+        }
+
+        for (Field field : forClass.getDeclaredFields()) {
+            if (Modifier.isFinal(field.getModifiers())
+                    || Modifier.isStatic(field.getModifiers())
+                    || field.getType().isPrimitive()) {
+                continue;
+            }
+
+            nullField(object, field);
+        }
+    }
+
+    private void nullField(Object obj, Field field) throws Exception {
+        logger.info("Setting {} to null on {}.", field.getName(), obj.getClass().getSimpleName());
+        boolean accessible = field.isAccessible();
+//        boolean accessible = field.canAccess(obj); // TODO: after ditching JDK 8
+        if (!accessible) {
+            field.setAccessible(true);
+        }
+        field.set(obj, null);
+        field.setAccessible(accessible);
+    }
 }
diff --git a/model/model-intest/src/test/java/com/evolveum/midpoint/model/intest/AbstractConfiguredModelIntegrationTest.java b/model/model-intest/src/test/java/com/evolveum/midpoint/model/intest/AbstractConfiguredModelIntegrationTest.java
index 7f8d12e1f24..222b2c92c08 100644
--- a/model/model-intest/src/test/java/com/evolveum/midpoint/model/intest/AbstractConfiguredModelIntegrationTest.java
+++ b/model/model-intest/src/test/java/com/evolveum/midpoint/model/intest/AbstractConfiguredModelIntegrationTest.java
@@ -37,8 +37,6 @@
 
 import java.io.File;
 import java.io.IOException;
-import java.lang.reflect.Field;
-import java.lang.reflect.Modifier;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Date;
@@ -48,7 +46,6 @@
 
 /**
  * @author semancik
- *
  */
 public class AbstractConfiguredModelIntegrationTest extends AbstractModelIntegrationTest {
 
@@ -613,47 +610,6 @@ protected PrismObject<UserType> getDefaultActor() {
         return userAdministrator;
     }
 
-    // TODO inttest: let's try it without this after 6 years
-//    @AfterClass(alwaysRun = true)
-    public void clearClassFields() throws Exception {
-        logger.trace("Clearing all fields for test class {}", getClass().getName());
-        nullAllFields(this, getClass());
-    }
-
-    /**
-     * This method null all fields which are not static, final or primitive type.
-     *
-     * All this is just to make GC work during DirtiesContext after every test class,
-     * because memory consumption is too big. Test class instances can't be GCed
-     * immediately. If they holds autowired fields like sessionFactory (for example
-     * through SqlRepositoryService impl), their memory footprint is getting big.
-     */
-    public void nullAllFields(Object object, Class<?> forClass) throws Exception {
-        if (forClass.getSuperclass() != null) {
-            nullAllFields(object, forClass.getSuperclass());
-        }
-
-        for (Field field : forClass.getDeclaredFields()) {
-            if (Modifier.isFinal(field.getModifiers())
-                    || Modifier.isStatic(field.getModifiers())
-                    || field.getType().isPrimitive()) {
-                continue;
-            }
-
-            nullField(object, field);
-        }
-    }
-
-    private void nullField(Object obj, Field field) throws Exception {
-        logger.info("Setting {} to null on {}.", new Object[]{field.getName(), obj.getClass().getSimpleName()});
-        boolean accessible = field.isAccessible();
-        if (!accessible) {
-            field.setAccessible(true);
-        }
-        field.set(obj, null);
-        field.setAccessible(accessible);
-    }
-
     protected PrismSchema getPiracySchema() {
         return prismContext.getSchemaRegistry().findSchemaByNamespace(NS_PIRACY);
     }