CursorWindowPerfTest.java revision 716cf42552f91d2cd73324c51762c2e3bd1dca21 
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 android.database;
18
19import static org.junit.Assert.assertTrue;
20
21import android.content.Context;
22import android.database.sqlite.SQLiteCursor;
23import android.database.sqlite.SQLiteDatabase;
24import android.perftests.utils.BenchmarkState;
25import android.perftests.utils.PerfStatusReporter;
26import android.support.test.InstrumentationRegistry;
27import android.support.test.filters.LargeTest;
28import android.support.test.runner.AndroidJUnit4;
29
30import org.junit.AfterClass;
31import org.junit.BeforeClass;
32import org.junit.Rule;
33import org.junit.Test;
34import org.junit.runner.RunWith;
35
36@RunWith(AndroidJUnit4.class)
37@LargeTest
38public class CursorWindowPerfTest {
39    @Rule
40    public PerfStatusReporter mPerfStatusReporter = new PerfStatusReporter();
41
42    private static Context getContext() {
43        return InstrumentationRegistry.getTargetContext();
44    }
45
46    private static final String DB_NAME = CursorWindowPerfTest.class.toString();
47
48    private static SQLiteDatabase sDatabase;
49
50    @BeforeClass
51    public static void setup() {
52        getContext().deleteDatabase(DB_NAME);
53        sDatabase = getContext().openOrCreateDatabase(DB_NAME, Context.MODE_PRIVATE, null);
54
55        for (TableHelper helper : TableHelper.TABLE_HELPERS) {
56            sDatabase.execSQL(helper.createSql());
57            final String insert = helper.insertSql();
58
59            // this test only needs 1 row
60            sDatabase.execSQL(insert, helper.createItem(0));
61        }
62
63    }
64
65    @AfterClass
66    public static void teardown() {
67        getContext().deleteDatabase(DB_NAME);
68    }
69
70    @Test
71    public void loadInt() {
72        loadRowFromCursorWindow(TableHelper.INT_1, false);
73    }
74
75    @Test
76    public void loadInt_doubleRef() {
77        loadRowFromCursorWindow(TableHelper.INT_1, true);
78    }
79
80    @Test
81    public void load10Ints() {
82        loadRowFromCursorWindow(TableHelper.INT_10, false);
83    }
84
85    @Test
86    public void loadUser() {
87        loadRowFromCursorWindow(TableHelper.USER, false);
88    }
89
90    private void loadRowFromCursorWindow(TableHelper helper, boolean doubleRef) {
91        try (Cursor cursor = sDatabase.rawQuery(helper.readSql(), new String[0])) {
92            TableHelper.CursorReader reader = helper.createReader(cursor);
93
94            SQLiteCursor sqLiteCursor = (SQLiteCursor) cursor;
95
96            sqLiteCursor.getCount(); // load one window
97            CursorWindow window = sqLiteCursor.getWindow();
98            assertTrue("must have enough rows", window.getNumRows() >= 1);
99            int start = window.getStartPosition();
100
101            BenchmarkState state = mPerfStatusReporter.getBenchmarkState();
102
103            if (!doubleRef) {
104                // normal access
105                while (state.keepRunning()) {
106                    cursor.moveToPosition(start);
107                    reader.read();
108                }
109            } else {
110                // add an extra window acquire/release to measure overhead
111                while (state.keepRunning()) {
112                    cursor.moveToPosition(start);
113                    try {
114                        window.acquireReference();
115                        reader.read();
116                    } finally {
117                        window.releaseReference();
118                    }
119                }
120            }
121        }
122    }
123}
124