Add read/write performance test for AppFuse.

The perforamnce test read from/write to 10MB data to AppFuse file 100
times.

Test: adb shell am instrument -w com.android.mtp.perftests/android.support.test.runner.AndroidJUnitRunner
Bug: 31982374
Change-Id: I8f78ee43d8078d7f1098249b28491cb43b5f3bef

3 files changed, 178 insertions, 0 deletions

diff --git a/packages/MtpDocumentsProvider/perf_tests/Android.mk b/packages/MtpDocumentsProvider/perf_tests/Android.mk
new file mode 100644
index 000000000000..f0d4878fd5e3
--- /dev/null
+++ b/packages/MtpDocumentsProvider/perf_tests/Android.mk
@@ -0,0 +1,11 @@
+LOCAL_PATH := $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_MODULE_TAGS := tests
+LOCAL_SRC_FILES := $(call all-java-files-under, src)
+LOCAL_STATIC_JAVA_LIBRARIES := android-support-test
+LOCAL_PACKAGE_NAME := MtpDocumentsProviderPerfTests
+LOCAL_INSTRUMENTATION_FOR := MtpDocumentsProvider
+LOCAL_CERTIFICATE := media
+
+include $(BUILD_PACKAGE)
diff --git a/packages/MtpDocumentsProvider/perf_tests/AndroidManifest.xml b/packages/MtpDocumentsProvider/perf_tests/AndroidManifest.xml
new file mode 100644
index 000000000000..26e109d40506
--- /dev/null
+++ b/packages/MtpDocumentsProvider/perf_tests/AndroidManifest.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.android.mtp.perftests"
+    android:sharedUserId="android.media">
+
+    <application>
+        <uses-library android:name="android.test.runner" />
+    </application>
+
+    <instrumentation android:name="android.support.test.runner.AndroidJUnitRunner"
+        android:targetPackage="com.android.mtp"
+        android:label="Performance tests for MtpDocumentsProvider." />
+</manifest>
diff --git a/packages/MtpDocumentsProvider/perf_tests/src/com/android/mtp/AppFuseTest.java b/packages/MtpDocumentsProvider/perf_tests/src/com/android/mtp/AppFuseTest.java
new file mode 100644
index 000000000000..a3e2e6b32baa
--- /dev/null
+++ b/packages/MtpDocumentsProvider/perf_tests/src/com/android/mtp/AppFuseTest.java
@@ -0,0 +1,154 @@
+/*
+ * Copyright (C) 2016 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.mtp;
+
+import android.app.Activity;
+import android.content.Context;
+import android.os.Bundle;
+import android.os.ParcelFileDescriptor;
+import android.os.storage.StorageManager;
+import android.system.ErrnoException;
+import android.system.Os;
+import android.support.test.filters.LargeTest;
+import android.support.test.InstrumentationRegistry;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.Arrays;
+import libcore.io.IoUtils;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+import org.junit.Test;
+
+@RunWith(JUnit4.class)
+public class AppFuseTest {
+    @Test
+    @LargeTest
+    public void testPerfReadWriteFile() throws IOException {
+        final Context context = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        final StorageManager storageManager = context.getSystemService(StorageManager.class);
+        final int INODE = 10;
+        final int SIZE = 10 * 1024 * 1024;  // 10MB
+        final AppFuse appFuse = new AppFuse(
+                "test",
+                new TestCallback() {
+                    @Override
+                    public long getFileSize(int inode) throws FileNotFoundException {
+                        if (inode != INODE) {
+                            throw new FileNotFoundException();
+                        }
+                        return SIZE;
+                    }
+
+                    @Override
+                    public long readObjectBytes(int inode, long offset, long size, byte[] bytes)
+                            throws IOException {
+                        return size;
+                    }
+
+                    @Override
+                    public int writeObjectBytes(
+                            long fileHandle, int inode, long offset, int size, byte[] bytes) {
+                        return size;
+                    }
+                });
+
+        appFuse.mount(storageManager);
+
+        final byte[] bytes = new byte[SIZE];
+        final int SAMPLES = 100;
+        final double[] readTime = new double[SAMPLES];
+        final double[] writeTime = new double[SAMPLES];
+
+        for (int i = 0; i < SAMPLES; i++) {
+            final ParcelFileDescriptor fd = appFuse.openFile(
+                    INODE,
+                    ParcelFileDescriptor.MODE_READ_ONLY);
+            try (final ParcelFileDescriptor.AutoCloseInputStream stream =
+                    new ParcelFileDescriptor.AutoCloseInputStream(fd)) {
+                final long startTime = System.nanoTime();
+                stream.read(bytes);
+                readTime[i] = (System.nanoTime() - startTime) / 1000.0 / 1000.0;
+            }
+
+        }
+
+        for (int i = 0; i < SAMPLES; i++) {
+            final ParcelFileDescriptor fd = appFuse.openFile(
+                    INODE,
+                    ParcelFileDescriptor.MODE_WRITE_ONLY | ParcelFileDescriptor.MODE_TRUNCATE);
+            try (final ParcelFileDescriptor.AutoCloseOutputStream stream =
+                    new ParcelFileDescriptor.AutoCloseOutputStream(fd)) {
+                final long startTime = System.nanoTime();
+                stream.write(bytes);
+                writeTime[i] = (System.nanoTime() - startTime) / 1000.0 / 1000.0;
+            }
+        }
+
+        appFuse.close();
+
+        double readAverage = 0;
+        double writeAverage = 0;
+        double readSquaredAverage = 0;
+        double writeSquaredAverage = 0;
+        for (int i = 0; i < SAMPLES; i++) {
+            readAverage += readTime[i];
+            writeAverage += writeTime[i];
+            readSquaredAverage += readTime[i] * readTime[i];
+            writeSquaredAverage += writeTime[i] * writeTime[i];
+        }
+
+        readAverage /= SAMPLES;
+        writeAverage /= SAMPLES;
+        readSquaredAverage /= SAMPLES;
+        writeSquaredAverage /= SAMPLES;
+
+        final Bundle results = new Bundle();
+        results.putDouble("readAverage", readAverage);
+        results.putDouble("readStandardDeviation",
+                Math.sqrt(readSquaredAverage - readAverage * readAverage));
+        results.putDouble("writeAverage", writeAverage);
+        results.putDouble("writeStandardDeviation",
+                Math.sqrt(writeSquaredAverage - writeAverage * writeAverage));
+        InstrumentationRegistry.getInstrumentation().sendStatus(Activity.RESULT_OK, results);
+    }
+
+    private static class TestCallback implements AppFuse.Callback {
+        @Override
+        public long getFileSize(int inode) throws FileNotFoundException {
+            throw new FileNotFoundException();
+        }
+
+        @Override
+        public long readObjectBytes(int inode, long offset, long size, byte[] bytes)
+                throws IOException {
+            throw new IOException();
+        }
+
+        @Override
+        public int writeObjectBytes(long fileHandle, int inode, long offset, int size, byte[] bytes)
+                throws IOException {
+            throw new IOException();
+        }
+
+        @Override
+        public void flushFileHandle(long fileHandle) throws IOException {}
+
+        @Override
+        public void closeFileHandle(long fileHandle) {}
+    }
+}