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- /*
- * Copyright 2000-2014 Vaadin Ltd.
- *
- * Licensed under the Apache License, Version 2.0 (the "License"); you may not
- * use this file except in compliance with the License. You may obtain a copy of
- * the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations under
- * the License.
- */
- package com.vaadin.util;
-
- import static org.junit.Assert.assertNull;
-
- import java.lang.ref.WeakReference;
- import java.lang.reflect.Field;
- import java.util.Map;
- import java.util.concurrent.atomic.AtomicBoolean;
-
- import org.easymock.EasyMock;
- import org.junit.Assert;
- import org.junit.Before;
- import org.junit.Test;
-
- import com.vaadin.server.VaadinRequest;
- import com.vaadin.server.VaadinService;
- import com.vaadin.server.VaadinSession;
- import com.vaadin.ui.UI;
-
- public class CurrentInstanceTest {
-
- @Before
- public void clearExistingThreadLocals() {
- // Ensure no previous test left some thread locals hanging
- CurrentInstance.clearAll();
- }
-
- @Test
- public void testInitiallyCleared() throws Exception {
- assertCleared();
- }
-
- @Test
- public void testClearedAfterRemove() throws Exception {
- CurrentInstance.set(CurrentInstanceTest.class, this);
- Assert.assertEquals(this,
- CurrentInstance.get(CurrentInstanceTest.class));
- CurrentInstance.set(CurrentInstanceTest.class, null);
-
- assertCleared();
- }
-
- @Test
- public void testClearedAfterRemoveInheritable() throws Exception {
- CurrentInstance.clearAll();
-
- CurrentInstance.setInheritable(CurrentInstanceTest.class, this);
- Assert.assertEquals(this,
- CurrentInstance.get(CurrentInstanceTest.class));
- CurrentInstance.setInheritable(CurrentInstanceTest.class, null);
-
- assertCleared();
- }
-
- @Test
- public void testInheritableThreadLocal() throws Exception {
- final AtomicBoolean threadFailed = new AtomicBoolean(true);
-
- CurrentInstance.setInheritable(CurrentInstanceTest.class, this);
- Assert.assertEquals(this,
- CurrentInstance.get(CurrentInstanceTest.class));
- Thread t = new Thread() {
- @Override
- public void run() {
- Assert.assertEquals(CurrentInstanceTest.this,
- CurrentInstance.get(CurrentInstanceTest.class));
- threadFailed.set(false);
- }
- };
- t.start();
- CurrentInstance.set(CurrentInstanceTest.class, null);
-
- assertCleared();
- while (t.isAlive()) {
- Thread.sleep(1000);
- }
- Assert.assertFalse("Thread failed", threadFailed.get());
-
- }
-
- @Test
- public void testClearedAfterRemoveInSeparateThread() throws Exception {
- final AtomicBoolean threadFailed = new AtomicBoolean(true);
-
- CurrentInstance.setInheritable(CurrentInstanceTest.class, this);
- Assert.assertEquals(this,
- CurrentInstance.get(CurrentInstanceTest.class));
- Thread t = new Thread() {
- @Override
- public void run() {
- try {
- Assert.assertEquals(CurrentInstanceTest.this,
- CurrentInstance.get(CurrentInstanceTest.class));
- CurrentInstance.set(CurrentInstanceTest.class, null);
- assertCleared();
-
- threadFailed.set(false);
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- };
- t.start();
-
- while (t.isAlive()) {
- Thread.sleep(1000);
- }
- Assert.assertFalse("Thread failed", threadFailed.get());
-
- // Clearing the threadlocal in the thread should not have cleared it
- // here
- Assert.assertEquals(this,
- CurrentInstance.get(CurrentInstanceTest.class));
-
- // Clearing the only remaining threadlocal should free all memory
- CurrentInstance.set(CurrentInstanceTest.class, null);
- assertCleared();
- }
-
- @Test
- public void testClearedWithClearAll() throws Exception {
- CurrentInstance.set(CurrentInstanceTest.class, this);
- Assert.assertEquals(this,
- CurrentInstance.get(CurrentInstanceTest.class));
- CurrentInstance.clearAll();
-
- assertCleared();
- }
-
- private void assertCleared() throws SecurityException,
- NoSuchFieldException, IllegalAccessException {
- Assert.assertNull(getInternalCurrentInstanceVariable().get());
- }
-
- private InheritableThreadLocal<Map<Class<?>, CurrentInstance>> getInternalCurrentInstanceVariable()
- throws SecurityException, NoSuchFieldException,
- IllegalAccessException {
- Field f = CurrentInstance.class.getDeclaredField("instances");
- f.setAccessible(true);
- return (InheritableThreadLocal<Map<Class<?>, CurrentInstance>>) f
- .get(null);
- }
-
- public void testInheritedClearedAfterRemove() {
-
- }
-
- private static class UIStoredInCurrentInstance extends UI {
- @Override
- protected void init(VaadinRequest request) {
- }
- }
-
- private static class SessionStoredInCurrentInstance extends VaadinSession {
- public SessionStoredInCurrentInstance(VaadinService service) {
- super(service);
- }
- }
-
- @Test
- public void testRestoringNullUIWorks() throws Exception {
- // First make sure current instance is empty
- CurrentInstance.clearAll();
-
- // Then store a new UI in there
- Map<Class<?>, CurrentInstance> old = CurrentInstance
- .setCurrent(new UIStoredInCurrentInstance());
-
- // Restore the old values and assert that the UI is null again
- CurrentInstance.restoreInstances(old);
- assertNull(CurrentInstance.get(UI.class));
- }
-
- @Test
- public void testRestoringNullSessionWorks() throws Exception {
- // First make sure current instance is empty
- CurrentInstance.clearAll();
-
- // Then store a new session in there
- Map<Class<?>, CurrentInstance> old = CurrentInstance
- .setCurrent(new SessionStoredInCurrentInstance(EasyMock
- .createNiceMock(VaadinService.class)));
-
- // Restore the old values and assert that the session is null again
- CurrentInstance.restoreInstances(old);
- assertNull(CurrentInstance.get(VaadinSession.class));
- assertNull(CurrentInstance.get(VaadinService.class));
- }
-
- @Test
- public void testRestoreWithGarbageCollectedValue()
- throws InterruptedException {
- VaadinSession session1 = new VaadinSession(null) {
- @Override
- public String toString() {
- return "First session";
- }
- };
- VaadinSession session2 = new VaadinSession(null) {
- @Override
- public String toString() {
- return "Second session";
- }
- };
-
- VaadinSession.setCurrent(session1);
- Map<Class<?>, CurrentInstance> previous = CurrentInstance
- .setCurrent(session2);
-
- // Use weak ref to verify object is collected
- WeakReference<VaadinSession> ref = new WeakReference<VaadinSession>(
- session1);
-
- session1 = null;
- waitUntilGarbageCollected(ref);
-
- CurrentInstance.restoreInstances(previous);
-
- Assert.assertNull(VaadinSession.getCurrent());
- }
-
- private static void waitUntilGarbageCollected(WeakReference<?> ref)
- throws InterruptedException {
- for (int i = 0; i < 50; i++) {
- System.gc();
- if (ref.get() == null) {
- return;
- }
- Thread.sleep(100);
- }
- Assert.fail("Value was not garbage collected.");
- }
- }
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