BlockHoundIntegration for spring-core

spring-core/src/test/java/org/springframework/core/SpringCoreBlockHoundIntegrationTests.java

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+/*
+ * Copyright 2002-2020 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.springframework.core;
+
+import java.lang.reflect.Method;
+import java.util.Map;
+import java.util.concurrent.CompletableFuture;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import reactor.blockhound.BlockHound;
+import reactor.core.scheduler.Schedulers;
+
+import org.springframework.tests.sample.objects.TestObject;
+import org.springframework.util.ConcurrentReferenceHashMap;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+/**
+ * Tests to verify the spring-core BlockHound integration rules.
+ *
+ * @author Rossen Stoyanchev
+ * @since 5.2.4
+ */
+public class SpringCoreBlockHoundIntegrationTests {
+
+
+	@BeforeAll
+	static void setUp() {
+		BlockHound.install();
+	}
+
+
+	@Test
+	void blockHoundIsInstalled() {
+		assertThatThrownBy(() -> testNonBlockingTask(() -> Thread.sleep(10)))
+				.hasMessageContaining("Blocking call!");
+	}
+
+	@Test
+	void localVariableTableParameterNameDiscoverer() {
+		testNonBlockingTask(() -> {
+			Method setName = TestObject.class.getMethod("setName", String.class);
+			String[] names = new LocalVariableTableParameterNameDiscoverer().getParameterNames(setName);
+			assertThat(names).isEqualTo(new String[] {"name"});
+		});
+	}
+
+	@Test
+	void concurrentReferenceHashMap() {
+		int size = 10000;
+		Map<String, String> map = new ConcurrentReferenceHashMap<>(size);
+
+		CompletableFuture<Object> future1 = new CompletableFuture<>();
+		testNonBlockingTask(() -> {
+			for (int i = 0; i < size / 2; i++) {
+				map.put("a" + i, "bar");
+			}
+		}, future1);
+
+		CompletableFuture<Object> future2 = new CompletableFuture<>();
+		testNonBlockingTask(() -> {
+			for (int i = 0; i < size / 2; i++) {
+				map.put("b" + i, "bar");
+			}
+		}, future2);
+
+		CompletableFuture.allOf(future1, future2).join();
+		assertThat(map).hasSize(size);
+	}
+
+	private void testNonBlockingTask(NonBlockingTask task) {
+		CompletableFuture<Object> future = new CompletableFuture<>();
+		testNonBlockingTask(task, future);
+		future.join();
+	}
+
+	private void testNonBlockingTask(NonBlockingTask task, CompletableFuture<Object> future) {
+		Schedulers.parallel().schedule(() -> {
+			try {
+				task.run();
+				future.complete(null);
+			}
+			catch (Throwable ex) {
+				future.completeExceptionally(ex);
+			}
+		});
+	}
+
+
+	@FunctionalInterface
+	private interface NonBlockingTask {
+
+		void run() throws Exception;
+	}
+
+}