73 lines
2.2 KiB
Java
73 lines
2.2 KiB
Java
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.internal.util;
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import android.util.Slog;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.TimeUnit;
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/**
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* A helper class to handle gc'ing a process, mainly used for testing.
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*
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* @hide
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*/
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public final class GcUtils {
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private static final String TAG = GcUtils.class.getSimpleName();
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/**
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* Runs a GC and attempts to wait for finalization.
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*/
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public static void runGcAndFinalizersSync() {
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Runtime.getRuntime().gc();
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Runtime.getRuntime().runFinalization();
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final CountDownLatch fence = new CountDownLatch(1);
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createFinalizationObserver(fence);
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try {
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do {
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Runtime.getRuntime().gc();
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Runtime.getRuntime().runFinalization();
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} while (!fence.await(100, TimeUnit.MILLISECONDS));
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} catch (InterruptedException ex) {
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throw new RuntimeException(ex);
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}
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Slog.v(TAG, "Running gc and finalizers");
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}
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/**
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* Create the observer in the scope of a method to minimize the chance that
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* it remains live in a DEX/machine register at the point of the fence guard.
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* This must be kept to avoid R8 inlining it.
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*/
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private static void createFinalizationObserver(CountDownLatch fence) {
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new Object() {
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@Override
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protected void finalize() throws Throwable {
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try {
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fence.countDown();
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} finally {
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super.finalize();
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}
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}
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};
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}
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// Uninstantiable
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private GcUtils() {}
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}
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