Add a cache to ICU.getBestDateTimePattern.

Brings the time down from 7ms to 7us for a cache hit on Nexus 4.

Bug: 11447043
Change-Id: I7cfc055c264ce49dadc72b5acdc2f2b0b339a5a1

1 files changed, 32 insertions, 0 deletions

diff --git a/benchmarks/src/benchmarks/regression/IcuBenchmark.java b/benchmarks/src/benchmarks/regression/IcuBenchmark.java
new file mode 100644
index 0000000..ee8270a
--- /dev/null
+++ b/benchmarks/src/benchmarks/regression/IcuBenchmark.java
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2013 Google Inc.
+ *
+ * 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.SimpleBenchmark;
+
+import java.util.Locale;
+import java.util.TimeZone;
+
+import libcore.icu.ICU;
+
+public class IcuBenchmark extends SimpleBenchmark {
+  public void time_getBestDateTimePattern(int reps) throws Exception {
+    for (int rep = 0; rep < reps; ++rep) {
+      ICU.getBestDateTimePattern("dEEEMMM", "US");
+    }
+  }
+}