1 /* 2 * Copyright (C) 2011 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package libcore.java.lang.ref; 18 19 /** 20 * Triggers finalizers to run. Note that live-precise bugs may interfere with 21 * analysis of what is reachable. Unreachable references in local frames may not 22 * be finalized even after a call to {@link #induceFinalization}. To work 23 * around, create finalizable objects in helper methods. http://b/4191345 24 */ 25 public final class FinalizationTester { FinalizationTester()26 private FinalizationTester() {} 27 induceFinalization()28 public static void induceFinalization() { 29 // System.gc() does not garbage collect every time. Runtime.gc() is 30 // more likely to perfom a gc. 31 Runtime.getRuntime().gc(); 32 enqueueReferences(); 33 System.runFinalization(); 34 } 35 enqueueReferences()36 public static void enqueueReferences() { 37 /* 38 * Hack. We don't have a programmatic way to wait for the reference queue 39 * daemon to move references to the appropriate queues. 40 */ 41 try { 42 Thread.sleep(100); 43 } catch (InterruptedException e) { 44 throw new AssertionError(); 45 } 46 } 47 } 48