1 /* 2 * Copyright (C) 2011 Google Inc. 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 package leakcanary 17 18 /** 19 * [GcTrigger] is used to try triggering garbage collection and enqueuing [KeyedWeakReference] into 20 * the associated [java.lang.ref.ReferenceQueue]. The default implementation [Default] comes from 21 * AOSP. 22 */ interfacenull23fun interface GcTrigger { 24 25 /** 26 * Attempts to run garbage collection. 27 */ 28 fun runGc() 29 30 /** 31 * Default implementation of [GcTrigger]. 32 */ 33 object Default : GcTrigger { 34 override fun runGc() { 35 // Code taken from AOSP FinalizationTest: 36 // https://android.googlesource.com/platform/libcore/+/master/support/src/test/java/libcore/ 37 // java/lang/ref/FinalizationTester.java 38 // System.gc() does not garbage collect every time. Runtime.gc() is 39 // more likely to perform a gc. 40 Runtime.getRuntime() 41 .gc() 42 enqueueReferences() 43 System.runFinalization() 44 } 45 46 private fun enqueueReferences() { 47 // Hack. We don't have a programmatic way to wait for the reference queue daemon to move 48 // references to the appropriate queues. 49 try { 50 Thread.sleep(100) 51 } catch (e: InterruptedException) { 52 throw AssertionError() 53 } 54 } 55 } 56 } 57