| /******************************************************************************* |
| * Copyright (c) 2011, 2015 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| * Lars Vogel <Lars.Vogel@vogella.com> - Bug 474274 |
| ******************************************************************************/ |
| package org.eclipse.e4.core.internal.tests.di; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertNull; |
| |
| import java.lang.ref.WeakReference; |
| |
| import javax.inject.Inject; |
| import javax.inject.Named; |
| |
| import org.eclipse.e4.core.contexts.ContextInjectionFactory; |
| import org.eclipse.e4.core.contexts.EclipseContextFactory; |
| import org.eclipse.e4.core.contexts.IEclipseContext; |
| import org.eclipse.e4.core.di.annotations.Optional; |
| import org.junit.Test; |
| |
| /** |
| * Test that we don't hold on to the values calculated during injection. |
| * This test relies on VM performing garbage collection in System.gc(). |
| * The actual VM processing of GC requests is up to the implementation |
| * so this test might not work on all VMs or might become invalid on |
| * future VMs. |
| */ |
| public class InjectionResultLeakTest { |
| |
| static class PartConsumer { |
| Object part; |
| |
| @Inject |
| void setPart(@Optional @Named("testGC") Object part) { |
| this.part = part; |
| } |
| } |
| |
| @Test |
| public void testLeaks() { |
| IEclipseContext context = EclipseContextFactory.create(); |
| WeakReference<?> ref; |
| |
| { // scope the "part" object to help GC |
| Object part = new Object(); |
| ref = new WeakReference<>(part); |
| assertEquals(part, ref.get()); |
| |
| context.set("testGC", part); |
| |
| PartConsumer consumer = ContextInjectionFactory.make( |
| PartConsumer.class, context); |
| assertEquals(part, consumer.part); |
| |
| part = null; // another "let's help GC" statement |
| context.remove("testGC"); |
| |
| assertNull(consumer.part); |
| } |
| |
| // gc a few times |
| System.runFinalization(); |
| System.gc(); |
| System.runFinalization(); |
| System.gc(); |
| System.runFinalization(); |
| System.gc(); |
| System.runFinalization(); |
| System.gc(); |
| |
| // partA should have been gc'd |
| assertNull("The object should have been garbage collected", ref.get()); |
| } |
| |
| } |