1 /* 2 * Copyright (C) 2018 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 com.android.internal.os; 18 19 import static org.junit.Assert.assertEquals; 20 import static org.junit.Assert.assertNotNull; 21 import static org.junit.Assert.assertNull; 22 import static org.junit.Assert.assertTrue; 23 24 import android.content.Context; 25 import android.os.FileUtils; 26 import android.os.SystemClock; 27 import android.support.test.InstrumentationRegistry; 28 import android.support.test.filters.SmallTest; 29 import android.support.test.runner.AndroidJUnit4; 30 31 import org.junit.After; 32 import org.junit.Before; 33 import org.junit.Test; 34 import org.junit.runner.RunWith; 35 36 import java.io.File; 37 import java.io.OutputStream; 38 import java.nio.ByteBuffer; 39 import java.nio.file.Files; 40 import java.util.Arrays; 41 import java.util.Random; 42 43 /** 44 * Test class for {@link KernelCpuProcReader}. 45 * 46 * $ atest FrameworksCoreTests:com.android.internal.os.KernelCpuProcReader 47 */ 48 @SmallTest 49 @RunWith(AndroidJUnit4.class) 50 public class KernelCpuProcReaderTest { 51 52 private File mRoot; 53 private File mTestDir; 54 private File mTestFile; 55 private Random mRand = new Random(); 56 57 private KernelCpuProcReader mKernelCpuProcReader; 58 59 private Context getContext() { 60 return InstrumentationRegistry.getContext(); 61 } 62 63 @Before 64 public void setUp() { 65 mTestDir = getContext().getDir("test", Context.MODE_PRIVATE); 66 mRoot = getContext().getFilesDir(); 67 mTestFile = new File(mTestDir, "test.file"); 68 mKernelCpuProcReader = new KernelCpuProcReader(mTestFile.getAbsolutePath()); 69 } 70 71 @After 72 public void tearDown() throws Exception { 73 FileUtils.deleteContents(mTestDir); 74 FileUtils.deleteContents(mRoot); 75 } 76 77 78 /** 79 * Tests that reading will return null if the file does not exist. 80 */ 81 @Test 82 public void testReadInvalidFile() throws Exception { 83 assertEquals(null, mKernelCpuProcReader.readBytes()); 84 } 85 86 /** 87 * Tests that reading will always return null after 5 failures. 88 */ 89 @Test 90 public void testReadErrorsLimit() throws Exception { 91 mKernelCpuProcReader.setThrottleInterval(0); 92 for (int i = 0; i < 3; i++) { 93 assertNull(mKernelCpuProcReader.readBytes()); 94 SystemClock.sleep(50); 95 } 96 97 final byte[] data = new byte[1024]; 98 mRand.nextBytes(data); 99 try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { 100 os.write(data); 101 } 102 assertTrue(Arrays.equals(data, toArray(mKernelCpuProcReader.readBytes()))); 103 104 assertTrue(mTestFile.delete()); 105 for (int i = 0; i < 3; i++) { 106 assertNull(mKernelCpuProcReader.readBytes()); 107 SystemClock.sleep(50); 108 } 109 try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { 110 os.write(data); 111 } 112 assertNull(mKernelCpuProcReader.readBytes()); 113 } 114 115 /** 116 * Tests reading functionality. 117 */ 118 @Test 119 public void testSimpleRead() throws Exception { 120 final byte[] data = new byte[1024]; 121 mRand.nextBytes(data); 122 try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { 123 os.write(data); 124 } 125 assertTrue(Arrays.equals(data, toArray(mKernelCpuProcReader.readBytes()))); 126 } 127 128 /** 129 * Tests multiple reading functionality. 130 */ 131 @Test 132 public void testMultipleRead() throws Exception { 133 mKernelCpuProcReader.setThrottleInterval(0); 134 for (int i = 0; i < 100; i++) { 135 final byte[] data = new byte[mRand.nextInt(102400) + 4]; 136 mRand.nextBytes(data); 137 try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { 138 os.write(data); 139 } 140 assertTrue(Arrays.equals(data, toArray(mKernelCpuProcReader.readBytes()))); 141 assertTrue(mTestFile.delete()); 142 } 143 } 144 145 /** 146 * Tests reading with resizing. 147 */ 148 @Test 149 public void testReadWithResize() throws Exception { 150 final byte[] data = new byte[128001]; 151 mRand.nextBytes(data); 152 try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { 153 os.write(data); 154 } 155 assertTrue(Arrays.equals(data, toArray(mKernelCpuProcReader.readBytes()))); 156 } 157 158 /** 159 * Tests that reading a file over the limit (1MB) will return null. 160 */ 161 @Test 162 public void testReadOverLimit() throws Exception { 163 final byte[] data = new byte[1228800]; 164 mRand.nextBytes(data); 165 try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { 166 os.write(data); 167 } 168 assertNull(mKernelCpuProcReader.readBytes()); 169 } 170 171 /** 172 * Tests throttling. Deleting underlying file should not affect cache. 173 */ 174 @Test 175 public void testThrottle() throws Exception { 176 mKernelCpuProcReader.setThrottleInterval(3000); 177 final byte[] data = new byte[20001]; 178 mRand.nextBytes(data); 179 try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { 180 os.write(data); 181 } 182 assertTrue(Arrays.equals(data, toArray(mKernelCpuProcReader.readBytes()))); 183 assertTrue(mTestFile.delete()); 184 for (int i = 0; i < 5; i++) { 185 assertTrue(Arrays.equals(data, toArray(mKernelCpuProcReader.readBytes()))); 186 SystemClock.sleep(10); 187 } 188 SystemClock.sleep(5000); 189 assertNull(mKernelCpuProcReader.readBytes()); 190 } 191 192 private byte[] toArray(ByteBuffer buffer) { 193 assertNotNull(buffer); 194 byte[] arr = new byte[buffer.remaining()]; 195 buffer.get(arr); 196 return arr; 197 } 198 } 199
