| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.felix.dm.itest.api; |
| |
| import java.util.concurrent.ForkJoinPool; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.felix.dm.Component; |
| import org.apache.felix.dm.ComponentState; |
| import org.apache.felix.dm.ComponentStateListener; |
| import org.apache.felix.dm.DependencyManager; |
| import org.apache.felix.dm.itest.util.Ensure; |
| import org.apache.felix.dm.itest.util.TestBase; |
| |
| /** |
| * Verifies if a concurrent deactivation of two components depending on each other does not produce a deadlock. |
| */ |
| public class FELIX5471_CyclicDependencyTest extends TestBase { |
| |
| volatile Ensure m_ensure; |
| |
| public void testCyclicDependency() throws InterruptedException { |
| DependencyManager m = getDM(); |
| ForkJoinPool tpool = new ForkJoinPool(2); |
| try { |
| for (int count = 0; count < 1000; count++) { |
| m_ensure = new Ensure(false); |
| |
| Component a = m.createComponent() |
| .setImplementation(new A()) |
| .setInterface(A.class.getName(), null) |
| .add(m.createServiceDependency().setService(B.class).setRequired(true).setCallbacks("add", "remove")); |
| |
| Component b = m.createComponent() |
| .setImplementation(new B()) |
| .setInterface(B.class.getName(), null) |
| .add(m.createServiceDependency().setService(A.class).setRequired(false).setCallbacks("add", "remove")); |
| |
| m.add(a); |
| m.add(b); |
| |
| ComponentStateListener l = (c, s) -> { |
| if (s == ComponentState.INACTIVE) { |
| m_ensure.step(); |
| } |
| }; |
| a.add(l); |
| b.add(l); |
| |
| m_ensure.waitForStep(4, 5000); // A started, B started |
| |
| tpool.execute(() -> m.remove(a)); |
| tpool.execute(() -> m.remove(b)); |
| |
| m_ensure.waitForStep(10, 5000); // A unbound from B, stopped and inactive, B unbound from A, stopped and inactive |
| |
| tpool.awaitQuiescence(5000, TimeUnit.MILLISECONDS); |
| } |
| } finally { |
| tpool.shutdown(); |
| } |
| } |
| |
| public class Base { |
| void start() { |
| m_ensure.step(); |
| } |
| |
| void stop() { |
| m_ensure.step(); |
| } |
| |
| } |
| |
| public class A extends Base { |
| public void add(B b) { |
| m_ensure.step(); |
| } |
| |
| public void remove(B b) { |
| m_ensure.step(); |
| } |
| } |
| |
| public class B extends Base { |
| public void add(A a) { |
| m_ensure.step(); |
| } |
| |
| public void remove(A a) { |
| m_ensure.step(); |
| } |
| } |
| } |