benchmarks: Add a String benchmark for replace.
Benchmarks have been added for the single char replacements as
well as Charsequence replacements.
bug: 28060800
Change-Id: Ib0fc466b38ff2037a422d5197694605f371a6959
diff --git a/benchmarks/src/benchmarks/regression/StringReplaceBenchmark.java b/benchmarks/src/benchmarks/regression/StringReplaceBenchmark.java
new file mode 100644
index 0000000..a527633
--- /dev/null
+++ b/benchmarks/src/benchmarks/regression/StringReplaceBenchmark.java
@@ -0,0 +1,89 @@
+/*
+ * 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 benchmarks.regression;
+
+import com.google.caliper.Param;
+
+public class StringReplaceBenchmark {
+ static enum StringLengths {
+ EMPTY(""),
+ L_16(makeString(16)),
+ L_64(makeString(64)),
+ L_256(makeString(256)),
+ L_512(makeString(512));
+
+ private final String value;
+
+ private StringLengths(String s) {
+ this.value = s;
+ }
+ }
+
+ private static final String makeString(int length) {
+ final String sequence8 = "abcdefghijklmnop";
+ final int numAppends = (length / 16) - 1;
+ StringBuilder stringBuilder = new StringBuilder(length);
+
+ // (n-1) occurences of "abcdefghijklmnop"
+ for (int i = 0; i < numAppends; ++i) {
+ stringBuilder.append(sequence8);
+ }
+
+ // and one final occurence of qrstuvwx.
+ stringBuilder.append("qrstuvwx");
+
+ return stringBuilder.toString();
+ }
+
+ @Param private StringLengths s;
+
+ public void timeReplaceCharNonExistent(int reps) {
+ for (int i = 0; i < reps; ++i) {
+ s.value.replace('z', '0');
+ }
+ }
+
+ public void timeReplaceCharRepeated(int reps) {
+ for (int i = 0; i < reps; ++i) {
+ s.value.replace('a', '0');
+ }
+ }
+
+ public void timeReplaceSingleChar(int reps) {
+ for (int i = 0; i < reps; ++i) {
+ s.value.replace('q', '0');
+ }
+ }
+
+ public void timeReplaceSequenceNonExistent(int reps) {
+ for (int i = 0; i < reps; ++i) {
+ s.value.replace("fish", "0");
+ }
+ }
+
+ public void timeReplaceSequenceRepeated(int reps) {
+ for (int i = 0; i < reps; ++i) {
+ s.value.replace("jklm", "0");
+ }
+ }
+
+ public void timeReplaceSingleSequence(int reps) {
+ for (int i = 0; i < reps; ++i) {
+ s.value.replace("qrst", "0");
+ }
+ }
+}