1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License 15 */ 16 17 package benchmarks; 18 19 import com.google.caliper.Param; 20 import java.lang.ref.Reference; 21 import java.lang.ref.SoftReference; 22 import java.lang.ref.WeakReference; 23 import java.lang.reflect.Field; 24 25 public class ReferenceGetBenchmark { 26 @Param boolean intrinsicDisabled; 27 28 private Object obj = "str"; 29 30 protected void setUp() throws Exception { 31 Field intrinsicDisabledField = Reference.class.getDeclaredField("disableIntrinsic"); 32 intrinsicDisabledField.setAccessible(true); 33 intrinsicDisabledField.setBoolean(null, intrinsicDisabled); 34 } 35 36 public void timeSoftReferenceGet(int reps) throws Exception { 37 Reference soft = new SoftReference(obj); 38 for (int i = 0; i < reps; i++) { 39 Object o = soft.get(); 40 } 41 } 42 43 public void timeWeakReferenceGet(int reps) throws Exception { 44 Reference weak = new WeakReference(obj); 45 for (int i = 0; i < reps; i++) { 46 Object o = weak.get(); 47 } 48 } 49 50 public void timeNonPreservedWeakReferenceGet(int reps) throws Exception { 51 Reference weak = new WeakReference(obj); 52 obj = null; 53 Runtime.getRuntime().gc(); 54 for (int i = 0; i < reps; i++) { 55 Object o = weak.get(); 56 } 57 } 58 } 59
