Moved slow path flag to Reference class

Added static field in Reference class to hold slow path flag and added
benchmark to test Reference.get() performance.

Change-Id: I13ad65a356fe4e104d8d83980694dc2740d7d039

1 files changed, 60 insertions, 0 deletions

diff --git a/benchmarks/src/benchmarks/ReferenceGetBenchmark.java b/benchmarks/src/benchmarks/ReferenceGetBenchmark.java
new file mode 100644
index 0000000..80142a1
--- /dev/null
+++ b/benchmarks/src/benchmarks/ReferenceGetBenchmark.java
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2014 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;
+
+import com.google.caliper.Param;
+import com.google.caliper.SimpleBenchmark;
+
+import java.lang.ref.Reference;
+import java.lang.ref.SoftReference;
+import java.lang.ref.WeakReference;
+import java.lang.reflect.*;
+
+public class ReferenceGetBenchmark extends SimpleBenchmark {
+    @Param boolean intrinsicDisabled;
+
+    private Object obj = "str";
+
+    protected void setUp() throws Exception {
+        Field intrinsicDisabledField = Reference.class.getDeclaredField("disableIntrinsic");
+        intrinsicDisabledField.setAccessible(true);
+        intrinsicDisabledField.setBoolean(null, intrinsicDisabled);
+    }
+
+    public void timeSoftReferenceGet(int reps) throws Exception {
+        Reference soft = new SoftReference(obj);
+        for (int i = 0; i < reps; i++) {
+            Object o = soft.get();
+        }
+    }
+
+    public void timeWeakReferenceGet(int reps) throws Exception {
+        Reference weak = new WeakReference(obj);
+        for (int i = 0; i < reps; i++) {
+            Object o = weak.get();
+        }
+    }
+
+    public void timeNonPreservedWeakReferenceGet(int reps) throws Exception {
+        Reference weak = new WeakReference(obj);
+        obj = null;
+        Runtime.getRuntime().gc();
+        for (int i = 0; i < reps; i++) {
+            Object o = weak.get();
+        }
+    }
+}