136 lines
4.6 KiB
Java
136 lines
4.6 KiB
Java
/*
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* Copyright (C) 2018 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 android.testing;
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import android.util.Log;
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import com.android.internal.annotations.VisibleForTesting;
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import libcore.util.SneakyThrow;
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import org.junit.rules.TestRule;
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import org.junit.runner.Description;
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import org.junit.runners.model.Statement;
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import java.util.ConcurrentModificationException;
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/**
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* Runs the test such that mocks created in it don't use a dedicated classloader.
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*
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* This allows mocking package-private methods.
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*
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* WARNING: This is absolutely incompatible with running tests in parallel!
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*/
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public class DexmakerShareClassLoaderRule implements TestRule {
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private static final String TAG = "ShareClassloaderRule";
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@VisibleForTesting
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static final String DEXMAKER_SHARE_CLASSLOADER_PROPERTY = "dexmaker.share_classloader";
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private static Thread sOwningThread = null;
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@Override
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public Statement apply(Statement base, Description description) {
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return apply(base::evaluate).toStatement();
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}
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/**
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* Runs the runnable such that mocks created in it don't use a dedicated classloader.
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*
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* This allows mocking package-private methods.
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*
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* WARNING: This is absolutely incompatible with running tests in parallel!
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*/
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public static void runWithDexmakerShareClassLoader(Runnable r) {
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try {
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apply(r::run).run();
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} catch (Throwable t) {
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SneakyThrow.sneakyThrow(t);
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}
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}
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/**
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* Returns a statement that first makes sure that only one thread at the time is modifying
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* the property. Then actually sets the property, and runs the statement.
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*/
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private static <T extends Throwable> ThrowingRunnable<T> apply(ThrowingRunnable<T> r) {
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return wrapInMutex(wrapInSetAndClearProperty(r));
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}
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private static <T extends Throwable> ThrowingRunnable<T> wrapInSetAndClearProperty(
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ThrowingRunnable<T> r) {
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return () -> {
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final String previousValue = System.getProperty(DEXMAKER_SHARE_CLASSLOADER_PROPERTY);
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try {
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System.setProperty(DEXMAKER_SHARE_CLASSLOADER_PROPERTY, "true");
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r.run();
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} finally {
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if (previousValue != null) {
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System.setProperty(DEXMAKER_SHARE_CLASSLOADER_PROPERTY, previousValue);
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} else {
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System.clearProperty(DEXMAKER_SHARE_CLASSLOADER_PROPERTY);
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}
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}
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};
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}
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/**
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* Runs the given statement, and while doing so prevents other threads from running statements.
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*/
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private static <T extends Throwable> ThrowingRunnable<T> wrapInMutex(ThrowingRunnable<T> r) {
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return () -> {
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final boolean isOwner;
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synchronized (DexmakerShareClassLoaderRule.class) {
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isOwner = (sOwningThread == null);
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if (isOwner) {
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sOwningThread = Thread.currentThread();
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} else if (sOwningThread != Thread.currentThread()) {
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final RuntimeException e = new ConcurrentModificationException(
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"Tried to set dexmaker.share_classloader from " + Thread.currentThread()
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+ ", but was already set from " + sOwningThread);
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// Also log in case exception gets swallowed.
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Log.e(TAG, e.getMessage(), e);
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throw e;
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}
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}
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try {
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r.run();
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} finally {
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synchronized (DexmakerShareClassLoaderRule.class) {
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if (isOwner) {
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sOwningThread = null;
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}
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}
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}
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};
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}
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private interface ThrowingRunnable<T extends Throwable> {
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void run() throws T;
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default Statement toStatement() {
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return new Statement() {
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@Override
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public void evaluate() throws Throwable {
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ThrowingRunnable.this.run();
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}
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};
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}
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}
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}
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