| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.internal.os; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertNotNull; |
| import static org.junit.Assert.assertNull; |
| import static org.junit.Assert.assertTrue; |
| |
| import android.content.Context; |
| import android.os.FileUtils; |
| import android.os.SystemClock; |
| import android.support.test.InstrumentationRegistry; |
| import android.support.test.filters.SmallTest; |
| import android.support.test.runner.AndroidJUnit4; |
| |
| import org.junit.After; |
| import org.junit.Before; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| |
| import java.io.File; |
| import java.io.OutputStream; |
| import java.nio.ByteBuffer; |
| import java.nio.file.Files; |
| import java.util.Arrays; |
| import java.util.Random; |
| |
| /** |
| * Test class for {@link KernelCpuProcReader}. |
| * |
| * $ atest FrameworksCoreTests:com.android.internal.os.KernelCpuProcReader |
| */ |
| @SmallTest |
| @RunWith(AndroidJUnit4.class) |
| public class KernelCpuProcReaderTest { |
| |
| private File mRoot; |
| private File mTestDir; |
| private File mTestFile; |
| private Random mRand = new Random(); |
| |
| private KernelCpuProcReader mKernelCpuProcReader; |
| |
| private Context getContext() { |
| return InstrumentationRegistry.getContext(); |
| } |
| |
| @Before |
| public void setUp() { |
| mTestDir = getContext().getDir("test", Context.MODE_PRIVATE); |
| mRoot = getContext().getFilesDir(); |
| mTestFile = new File(mTestDir, "test.file"); |
| mKernelCpuProcReader = new KernelCpuProcReader(mTestFile.getAbsolutePath()); |
| } |
| |
| @After |
| public void tearDown() throws Exception { |
| FileUtils.deleteContents(mTestDir); |
| FileUtils.deleteContents(mRoot); |
| } |
| |
| |
| /** |
| * Tests that reading will return null if the file does not exist. |
| */ |
| @Test |
| public void testReadInvalidFile() throws Exception { |
| assertEquals(null, mKernelCpuProcReader.readBytes()); |
| } |
| |
| /** |
| * Tests that reading will always return null after 5 failures. |
| */ |
| @Test |
| public void testReadErrorsLimit() throws Exception { |
| mKernelCpuProcReader.setThrottleInterval(0); |
| for (int i = 0; i < 3; i++) { |
| assertNull(mKernelCpuProcReader.readBytes()); |
| SystemClock.sleep(50); |
| } |
| |
| final byte[] data = new byte[1024]; |
| mRand.nextBytes(data); |
| try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { |
| os.write(data); |
| } |
| assertTrue(Arrays.equals(data, toArray(mKernelCpuProcReader.readBytes()))); |
| |
| assertTrue(mTestFile.delete()); |
| for (int i = 0; i < 3; i++) { |
| assertNull(mKernelCpuProcReader.readBytes()); |
| SystemClock.sleep(50); |
| } |
| try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { |
| os.write(data); |
| } |
| assertNull(mKernelCpuProcReader.readBytes()); |
| } |
| |
| /** |
| * Tests reading functionality. |
| */ |
| @Test |
| public void testSimpleRead() throws Exception { |
| final byte[] data = new byte[1024]; |
| mRand.nextBytes(data); |
| try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { |
| os.write(data); |
| } |
| assertTrue(Arrays.equals(data, toArray(mKernelCpuProcReader.readBytes()))); |
| } |
| |
| /** |
| * Tests multiple reading functionality. |
| */ |
| @Test |
| public void testMultipleRead() throws Exception { |
| mKernelCpuProcReader.setThrottleInterval(0); |
| for (int i = 0; i < 100; i++) { |
| final byte[] data = new byte[mRand.nextInt(102400) + 4]; |
| mRand.nextBytes(data); |
| try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { |
| os.write(data); |
| } |
| assertTrue(Arrays.equals(data, toArray(mKernelCpuProcReader.readBytes()))); |
| assertTrue(mTestFile.delete()); |
| } |
| } |
| |
| /** |
| * Tests reading with resizing. |
| */ |
| @Test |
| public void testReadWithResize() throws Exception { |
| final byte[] data = new byte[128001]; |
| mRand.nextBytes(data); |
| try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { |
| os.write(data); |
| } |
| assertTrue(Arrays.equals(data, toArray(mKernelCpuProcReader.readBytes()))); |
| } |
| |
| /** |
| * Tests that reading a file over the limit (1MB) will return null. |
| */ |
| @Test |
| public void testReadOverLimit() throws Exception { |
| final byte[] data = new byte[1228800]; |
| mRand.nextBytes(data); |
| try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { |
| os.write(data); |
| } |
| assertNull(mKernelCpuProcReader.readBytes()); |
| } |
| |
| /** |
| * Tests throttling. Deleting underlying file should not affect cache. |
| */ |
| @Test |
| public void testThrottle() throws Exception { |
| mKernelCpuProcReader.setThrottleInterval(3000); |
| final byte[] data = new byte[20001]; |
| mRand.nextBytes(data); |
| try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { |
| os.write(data); |
| } |
| assertTrue(Arrays.equals(data, toArray(mKernelCpuProcReader.readBytes()))); |
| assertTrue(mTestFile.delete()); |
| for (int i = 0; i < 5; i++) { |
| assertTrue(Arrays.equals(data, toArray(mKernelCpuProcReader.readBytes()))); |
| SystemClock.sleep(10); |
| } |
| SystemClock.sleep(5000); |
| assertNull(mKernelCpuProcReader.readBytes()); |
| } |
| |
| private byte[] toArray(ByteBuffer buffer) { |
| assertNotNull(buffer); |
| byte[] arr = new byte[buffer.remaining()]; |
| buffer.get(arr); |
| return arr; |
| } |
| } |