| /* |
| * Copyright (C) 2009 The Guava Authors |
| * |
| * 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.google.common.util.concurrent; |
| |
| import com.google.common.base.Supplier; |
| import com.google.common.base.Suppliers; |
| |
| import junit.framework.TestCase; |
| |
| import java.security.Permission; |
| import java.util.concurrent.Callable; |
| |
| /** |
| * Unit tests for {@link Callables}. |
| * |
| * @author Isaac Shum |
| */ |
| public class CallablesTest extends TestCase { |
| |
| public void testReturning() throws Exception { |
| assertNull(Callables.returning(null).call()); |
| |
| Object value = new Object(); |
| Callable<Object> callable = Callables.returning(value); |
| assertSame(value, callable.call()); |
| // Expect the same value on subsequent calls |
| assertSame(value, callable.call()); |
| } |
| |
| public void testRenaming() throws Exception { |
| String oldName = Thread.currentThread().getName(); |
| final Supplier<String> newName = Suppliers.ofInstance("MyCrazyThreadName"); |
| Callable<Void> callable = new Callable<Void>() { |
| @Override public Void call() throws Exception { |
| assertEquals(Thread.currentThread().getName(), newName.get()); |
| return null; |
| } |
| }; |
| Callables.threadRenaming(callable, newName).call(); |
| assertEquals(oldName, Thread.currentThread().getName()); |
| } |
| |
| public void testRenaming_exceptionalReturn() throws Exception { |
| String oldName = Thread.currentThread().getName(); |
| final Supplier<String> newName = Suppliers.ofInstance("MyCrazyThreadName"); |
| class MyException extends Exception {} |
| Callable<Void> callable = new Callable<Void>() { |
| @Override public Void call() throws Exception { |
| assertEquals(Thread.currentThread().getName(), newName.get()); |
| throw new MyException(); |
| } |
| }; |
| try { |
| Callables.threadRenaming(callable, newName).call(); |
| fail(); |
| } catch (MyException expected) {} |
| assertEquals(oldName, Thread.currentThread().getName()); |
| } |
| |
| public void testRenaming_noPermissions() throws Exception { |
| System.setSecurityManager(new SecurityManager() { |
| @Override public void checkAccess(Thread t) { |
| throw new SecurityException(); |
| } |
| @Override public void checkPermission(Permission perm) { |
| // Do nothing so we can clear the security manager at the end |
| } |
| }); |
| try { |
| final String oldName = Thread.currentThread().getName(); |
| Supplier<String> newName = Suppliers.ofInstance("MyCrazyThreadName"); |
| Callable<Void> callable = new Callable<Void>() { |
| @Override public Void call() throws Exception { |
| assertEquals(Thread.currentThread().getName(), oldName); |
| return null; |
| } |
| }; |
| Callables.threadRenaming(callable, newName).call(); |
| assertEquals(oldName, Thread.currentThread().getName()); |
| } finally { |
| System.setSecurityManager(null); |
| } |
| } |
| } |