1 /*
2  * Copyright (C) 2014 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 
17 package android.libcore;
18 
19 import android.perftests.utils.BenchmarkState;
20 import android.perftests.utils.PerfStatusReporter;
21 import android.test.suitebuilder.annotation.LargeTest;
22 
23 import androidx.test.runner.AndroidJUnit4;
24 
25 import org.junit.Before;
26 import org.junit.Rule;
27 import org.junit.Test;
28 import org.junit.runner.RunWith;
29 
30 import java.lang.ref.Reference;
31 import java.lang.ref.SoftReference;
32 import java.lang.ref.WeakReference;
33 import java.lang.reflect.Field;
34 
35 @RunWith(AndroidJUnit4.class)
36 @LargeTest
37 public class ReferenceGetPerfTest {
38     @Rule public PerfStatusReporter mPerfStatusReporter = new PerfStatusReporter();
39 
40     boolean mIntrinsicDisabled;
41 
42     private Object mObj = "str";
43 
44     @Before
setUp()45     public void setUp() throws Exception {
46         Field intrinsicDisabledField = Reference.class.getDeclaredField("disableIntrinsic");
47         intrinsicDisabledField.setAccessible(true);
48         intrinsicDisabledField.setBoolean(null, mIntrinsicDisabled);
49     }
50 
51     @Test
timeSoftReferenceGet()52     public void timeSoftReferenceGet() throws Exception {
53         Reference soft = new SoftReference(mObj);
54         BenchmarkState state = mPerfStatusReporter.getBenchmarkState();
55         while (state.keepRunning()) {
56             Object o = soft.get();
57         }
58     }
59 
60     @Test
timeWeakReferenceGet()61     public void timeWeakReferenceGet() throws Exception {
62         Reference weak = new WeakReference(mObj);
63         BenchmarkState state = mPerfStatusReporter.getBenchmarkState();
64         while (state.keepRunning()) {
65             Object o = weak.get();
66         }
67     }
68 
69     @Test
timeNonPreservedWeakReferenceGet()70     public void timeNonPreservedWeakReferenceGet() throws Exception {
71         Reference weak = new WeakReference(mObj);
72         mObj = null;
73         Runtime.getRuntime().gc();
74         BenchmarkState state = mPerfStatusReporter.getBenchmarkState();
75         while (state.keepRunning()) {
76             Object o = weak.get();
77         }
78     }
79 }
80