Add XmlSerializerPerfTest

/*

 * Copyright (C) 2022 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.libcore;

import android.perftests.utils.BenchmarkState;

import android.perftests.utils.PerfStatusReporter;

import android.test.suitebuilder.annotation.LargeTest;

import android.util.Xml;

import androidx.test.runner.AndroidJUnit4;

import libcore.util.XmlObjectFactory;

import org.junit.Rule;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.xmlpull.v1.XmlSerializer;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStream;

import java.nio.charset.StandardCharsets;

/**

 * Compares various kinds of method invocation.

 */

@RunWith(AndroidJUnit4.class)

@LargeTest

public class XmlSerializerPerfTest {

    @Rule

    public PerfStatusReporter mPerfStatusReporter = new PerfStatusReporter();

    @Test

    public void timeFastSerializer_nonIndent_depth100() throws IOException {

        BenchmarkState state = mPerfStatusReporter.getBenchmarkState();

        while (state.keepRunning()) {

            XmlSerializer serializer = Xml.newFastSerializer();

            runTest(serializer, 100);

        }

    }

    @Test

    public void timeFastSerializer_indent_depth100() throws IOException {

        BenchmarkState state = mPerfStatusReporter.getBenchmarkState();

        while (state.keepRunning()) {

            XmlSerializer serializer = Xml.newFastSerializer();

            serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);

            runTest(serializer, 100);

        }

    }

    @Test

    public void timeKXmlSerializer_nonIndent_depth100() throws IOException {

        BenchmarkState state = mPerfStatusReporter.getBenchmarkState();

        while (state.keepRunning()) {

            XmlSerializer serializer = XmlObjectFactory.newXmlSerializer();

            runTest(serializer, 100);

        }

    }

    @Test

    public void timeKXmlSerializer_indent_depth100() throws IOException {

        BenchmarkState state = mPerfStatusReporter.getBenchmarkState();

        while (state.keepRunning()) {

            XmlSerializer serializer = XmlObjectFactory.newXmlSerializer();

            serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);

            runTest(serializer, 100);

        }

    }

    private void runTest(XmlSerializer serializer, int depth) throws IOException {

        File file = File.createTempFile(XmlSerializerPerfTest.class.getSimpleName(), "tmp");

        try (OutputStream out = new FileOutputStream(file)) {

            serializer.setOutput(out, StandardCharsets.UTF_8.name());

            serializer.startDocument(null, true);

            writeContent(serializer, depth);

            serializer.endDocument();

        }

    }

    private void writeContent(XmlSerializer serializer, int depth) throws IOException {

        serializer.startTag(null, "tag");

        serializer.attribute(null, "attribute", "value1");

        if (depth > 0) {

            writeContent(serializer, depth - 1);

        }

        serializer.endTag(null, "tag");

    }

}