Add read/write performance test for AppFuse.

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)

<?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>

/*

 * 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) {}

    }

}