Benchmarks to measure CursorWindow overheads.

            <action android:name="com.android.perftests.core.PERFTEST" />

          </intent-filter>

        </activity>

        <service android:name="android.os.SomeService" android:exported="false" android:process=":some_service" />

        <service

            android:name="android.os.SomeService"

            android:exported="false"

            android:process=":some_service" />

        <provider

            android:name="android.os.SomeProvider"

            android:authorities="android.os.SomeProvider"

            android:exported="false"

            android:process=":some_provider" />

        <service

            android:name="android.view.autofill.MyAutofillService"

/*

 * Copyright (C) 2020 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 android.database;

import static org.junit.Assert.assertEquals;

import android.content.ContentProviderClient;

import android.content.ContentValues;

import android.content.Intent;

import android.net.Uri;

import android.perftests.utils.BenchmarkState;

import android.perftests.utils.PerfStatusReporter;

import androidx.test.InstrumentationRegistry;

import androidx.test.filters.LargeTest;

import androidx.test.runner.AndroidJUnit4;

import org.junit.Rule;

import org.junit.Test;

import org.junit.runner.RunWith;

@RunWith(AndroidJUnit4.class)

@LargeTest

public class CrossProcessCursorPerfTest {

    @Rule

    public PerfStatusReporter mPerfStatusReporter = new PerfStatusReporter();

    /**

     * Measure transporting a small {@link Cursor}, roughly 1KB in size.

     */

    @Test

    public void timeSmall() throws Exception {

        time(1);

    }

    /**

     * Measure transporting a small {@link Cursor}, roughly 54KB in size.

     */

    @Test

    public void timeMedium() throws Exception {

        time(100);

    }

    /**

     * Measure transporting a small {@link Cursor}, roughly 5.4MB in size.

     */

    @Test

    public void timeLarge() throws Exception {

        time(10_000);

    }

    private static final Uri TEST_URI = Uri.parse("content://android.os.SomeProvider/");

    private void time(int count) throws Exception {

        try (ContentProviderClient client = InstrumentationRegistry.getTargetContext()

                .getContentResolver().acquireContentProviderClient(TEST_URI)) {

            // Configure remote side once with data size to return

            final ContentValues values = new ContentValues();

            values.put(Intent.EXTRA_INDEX, count);

            client.update(TEST_URI, values, null);

            // Repeatedly query that data until we reach convergence

            final BenchmarkState state = mPerfStatusReporter.getBenchmarkState();

            while (state.keepRunning()) {

                try (Cursor c = client.query(TEST_URI, null, null, null)) {

                    // Actually walk the returned values to ensure we pull all

                    // data from the remote side

                    while (c.moveToNext()) {

                        assertEquals(c.getPosition(), c.getInt(0));

                    }

                }

            }

        }

    }

}

/*

 * Copyright (C) 2020 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 android.os;

import android.content.ContentProvider;

import android.content.ContentValues;

import android.content.Intent;

import android.database.Cursor;

import android.database.MatrixCursor;

import android.net.Uri;

import java.util.Arrays;

public class SomeProvider extends ContentProvider {

    private Cursor mCursor;

    @Override

    public boolean onCreate() {

        return true;

    }

    @Override

    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,

            String sortOrder) {

        return mCursor;

    }

    @Override

    public String getType(Uri uri) {

        throw new UnsupportedOperationException();

    }

    @Override

    public Uri insert(Uri uri, ContentValues values) {

        throw new UnsupportedOperationException();

    }

    @Override

    public int delete(Uri uri, String selection, String[] selectionArgs) {

        throw new UnsupportedOperationException();

    }

    @Override

    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {

        final char[] valueRaw = new char[512];

        Arrays.fill(valueRaw, '!');

        final String value = new String(valueRaw);

        final int count = values.getAsInteger(Intent.EXTRA_INDEX);

        final MatrixCursor cursor = new MatrixCursor(new String[] { "_id", "value" });

        for (int i = 0; i < count; i++) {

            MatrixCursor.RowBuilder row = cursor.newRow();

            row.add(0, i);

            row.add(1, value);

        }

        mCursor = cursor;

        return 1;

    }

}