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