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Use multiple locks in ByteBuddyMockFactory to reduce lock contention
Changed locking scheme in ByteBuddyMockFactory from a single global lock CACHE to cacheLocks with size 16. The used TypeCachingLock from cacheLocks depends on the hashcode of TypeCache.SimpleKey, which aggregates the types to mock. The old global CACHE lock did block Threads regardless, if they try to mock the same type or not. This is a similar fix as in Mockito: mockito/mockito#3095 Co-authored-by: Björn Kautler <Bjoern@Kautler.net>
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146 changes: 146 additions & 0 deletions
146
...src/test/groovy/org/spockframework/mock/runtime/ByteBuddyMockFactoryConcurrentSpec.groovy
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| /* | ||
| * Copyright 2023 the original author or authors. | ||
| * | ||
| * 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 | ||
| * | ||
| * https://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 org.spockframework.mock.runtime | ||
|
|
||
| import groovy.transform.Canonical | ||
| import spock.lang.Shared | ||
| import spock.lang.Specification | ||
| import spock.lang.Timeout | ||
|
|
||
| import java.util.concurrent.CompletableFuture | ||
| import java.util.concurrent.Phaser | ||
| import java.util.concurrent.TimeUnit | ||
| import java.util.function.Function | ||
|
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||
| class ByteBuddyMockFactoryConcurrentSpec extends Specification { | ||
| private static final String IfA = "IfA" | ||
| private static final String IfB = "IfB" | ||
| private static final String IfC = "IfC" | ||
| @Shared | ||
| final IProxyBasedMockInterceptor interceptor = Stub() | ||
|
|
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| def "ensure lockMask bit patterns"() { | ||
| expect: | ||
| 1 << Integer.bitCount(ByteBuddyMockFactory.CACHE_LOCK_MASK) - 1 == Integer.highestOneBit(ByteBuddyMockFactory.CACHE_LOCK_MASK) | ||
| } | ||
|
|
||
| // Just to be save to abort, normally the tests run in 2 secs. | ||
| @Timeout(40) | ||
| def "cacheLockingStressTest #test"() { | ||
| given: | ||
| int iterations = 5_000 | ||
| def tempClassLoader = new ByteBuddyTestClassLoader() | ||
| MockFeatures featA = toMockFeatures(mockSpecA, tempClassLoader) | ||
| MockFeatures featB = toMockFeatures(mockSpecB, tempClassLoader) | ||
| ByteBuddyMockFactory mockFactory = new ByteBuddyMockFactory() | ||
|
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| Phaser phaser = new Phaser(4) | ||
| Function<Runnable, CompletableFuture<Void>> runCode = { Runnable code -> | ||
| CompletableFuture.runAsync { | ||
| phaser.arriveAndAwaitAdvance() | ||
| try { | ||
| for (int i = 0; i < iterations; i++) { | ||
| code.run() | ||
| } | ||
| } finally { | ||
| phaser.arrive() | ||
| } | ||
| } | ||
| } | ||
| when: | ||
| def mockFeatAFuture = runCode.apply { | ||
| Class<?> mockClass = mockClass(mockFactory, tempClassLoader, featA) | ||
| assertValidMockClass(featA, mockClass, tempClassLoader) | ||
| } | ||
|
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| def mockFeatBFuture = runCode.apply { | ||
| Class<?> mockClass = mockClass(mockFactory, tempClassLoader, featB) | ||
| assertValidMockClass(featB, mockClass, tempClassLoader) | ||
| } | ||
|
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| def cacheFuture = runCode.apply { mockFactory.CACHE.clear() } | ||
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| phaser.arriveAndAwaitAdvance() | ||
| // Wait for test to end | ||
| int phase = phaser.arrive() | ||
| try { | ||
| phaser.awaitAdvanceInterruptibly(phase, 30, TimeUnit.SECONDS) | ||
| } finally { | ||
| // Collect exceptions from the futures, to make issues visible. | ||
| mockFeatAFuture.getNow(null) | ||
| mockFeatBFuture.getNow(null) | ||
| cacheFuture.getNow(null) | ||
| } | ||
| then: | ||
| noExceptionThrown() | ||
|
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||
| where: | ||
| test | mockSpecA | mockSpecB | ||
| "same hashcode different mockType" | mockSpec(IfA, IfB) | mockSpec(IfB, IfA) | ||
| "same hashcode same mockType" | mockSpec(IfA) | mockSpec(IfA) | ||
| "different hashcode different interfaces" | mockSpec(IfA, IfB) | mockSpec(IfB, IfC) | ||
| "unrelated classes" | mockSpec(IfA) | mockSpec(IfB) | ||
| } | ||
|
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| private Class<?> mockClass(ByteBuddyMockFactory mockFactory, ClassLoader cl, MockFeatures feature) { | ||
| return mockFactory.createMock( | ||
| feature.mockType, | ||
| feature.interfaces, | ||
| null, | ||
| interceptor, | ||
| cl, | ||
| false) | ||
| .getClass() | ||
| } | ||
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| private static MockSpec mockSpec(String mockedType, String... interfaces) { | ||
| return new MockSpec(mockedType, interfaces as List) | ||
| } | ||
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| private void assertValidMockClass(MockFeatures mockFeature, Class<?> mockClass, ClassLoader classLoader) { | ||
| assert mockClass.classLoader == classLoader | ||
| assert mockFeature.mockType.isAssignableFrom(mockClass) | ||
| mockFeature.interfaces.each { | ||
| assert it.isAssignableFrom(mockClass) | ||
| } | ||
| } | ||
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| MockFeatures toMockFeatures(MockSpec mockFeaturesString, ByteBuddyTestClassLoader classLoader) { | ||
| def mockType = classLoader.defineInterface(mockFeaturesString.mockType) | ||
| def interfaces = mockFeaturesString.interfaces.collect { classLoader.defineInterface(it) } | ||
| return new MockFeatures(mockType, interfaces) | ||
| } | ||
|
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| /** | ||
| * Class holding the loaded classes to mock. | ||
| */ | ||
| @Canonical | ||
| private static class MockFeatures { | ||
| final Class<?> mockType | ||
| final List<Class<?>> interfaces | ||
| } | ||
|
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| /** | ||
| * Class holding the class names to mock. | ||
| * Which will be converted into a {@link MockFeatures} during test. | ||
| */ | ||
| @Canonical | ||
| private static class MockSpec { | ||
| final String mockType | ||
| final List<String> interfaces | ||
| } | ||
| } |
55 changes: 55 additions & 0 deletions
55
spock-specs/src/test/groovy/org/spockframework/mock/runtime/ByteBuddyTestClassLoader.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| /* | ||
| * Copyright 2023 the original author or authors. | ||
| * | ||
| * 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 | ||
| * | ||
| * https://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. | ||
| */ | ||
|
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| package org.spockframework.mock.runtime; | ||
|
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| import net.bytebuddy.ByteBuddy; | ||
| import net.bytebuddy.description.type.TypeDescription; | ||
| import net.bytebuddy.dynamic.loading.ClassLoadingStrategy; | ||
|
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| import java.util.HashMap; | ||
| import java.util.Map; | ||
|
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| final class ByteBuddyTestClassLoader extends ClassLoader { | ||
| private final Map<String, Class<?>> cache = new HashMap<>(); | ||
|
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| private final ClassLoadingStrategy<ByteBuddyTestClassLoader> loadingStrategy = (loader, types) -> { | ||
| Map<TypeDescription, Class<?>> result = new HashMap<>(); | ||
| for (Map.Entry<TypeDescription, byte[]> entry : types.entrySet()) { | ||
| TypeDescription description = entry.getKey(); | ||
| byte[] bytes = entry.getValue(); | ||
| Class<?> clazz = defineClass(description.getName(), bytes, 0, bytes.length); | ||
| result.put(description, clazz); | ||
| } | ||
| return result; | ||
| }; | ||
|
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| /** | ||
| * Defines an empty interface with the passed {@code node}. | ||
| * | ||
| * @param name the name of the interface | ||
| * @return the loaded {@code Class} | ||
| */ | ||
| synchronized Class<?> defineInterface(String name) { | ||
| //noinspection resource | ||
| return cache.computeIfAbsent(name, nameKey -> new ByteBuddy() | ||
| .makeInterface() | ||
| .name(nameKey) | ||
| .make() | ||
| .load(this, loadingStrategy) | ||
| .getLoaded()); | ||
| } | ||
| } |