1/*
2 * Copyright (C) 2017 The Android Open Source Project
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
17package com.android.systemui.util.leak;
18
19import static org.junit.Assert.assertEquals;
20import static org.junit.Assert.assertNotSame;
21import static org.junit.Assert.assertTrue;
22
23import android.support.test.filters.SmallTest;
24import android.support.test.runner.AndroidJUnit4;
25
26import com.android.systemui.SysuiTestCase;
27import com.android.systemui.util.leak.ReferenceTestUtils.CollectionWaiter;
28
29import org.junit.Before;
30import org.junit.Test;
31import org.junit.runner.RunWith;
32
33@SmallTest
34@RunWith(AndroidJUnit4.class)
35public class WeakIdentityHashMapTest extends SysuiTestCase {
36
37    WeakIdentityHashMap<Object, Object> mMap;
38
39    @Before
40    public void setup() {
41        mMap = new WeakIdentityHashMap<>();
42    }
43
44    private CollectionWaiter addObjectToMap(WeakIdentityHashMap<Object, Object> map) {
45      Object object = new Object();
46      CollectionWaiter collectionWaiter = ReferenceTestUtils.createCollectionWaiter(object);
47      map.put(object, "value");
48      return collectionWaiter;
49    }
50
51    @Test
52    public void testUsesIdentity() {
53        String a1 = new String("a");
54        String a2 = new String("a");
55        assertNotSame(a1, a2);
56
57        mMap.put(a1, "value1");
58        mMap.put(a2, "value2");
59
60        assertEquals("value1", mMap.get(a1));
61        assertEquals("value2", mMap.get(a2));
62    }
63
64    @Test
65    public void testWeaklyReferences() {
66        // Allocate and add an object to the weak map in a separate method to avoid a live
67        // reference to the allocated object in a dex register. As R8 is used to compile this
68        // test the --dontoptimize flag is also required to ensure that the method is not
69        // inlined, as that would defeat the purpose of having the allocation in a separate
70        // method.
71        CollectionWaiter collectionWaiter = addObjectToMap(mMap);
72
73        // Wait until object has been collected. We'll also need to wait for mMap to become empty,
74        // because our collection waiter may be told about the collection earlier than mMap.
75        collectionWaiter.waitForCollection();
76        ReferenceTestUtils.waitForCondition(mMap::isEmpty);
77
78        assertEquals(0, mMap.size());
79        assertTrue(mMap.isEmpty());
80    }
81}
82