Add XmlSerializerPerfTest

Bug: 230007772
Test: atest  CorePerfTests:android.libcore.XmlSerializerPerfTest
Change-Id: I2f6837db1496a9db41cab3d33f45b506610d19da

apct-tests/perftests/core/src/android/libcore/XmlSerializerPerfTest.java

+/*
+ * 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");
+    }
+
+}