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- import java.lang.reflect.Field;
- import java.util.ArrayList;
- import java.util.List;
- import java.util.Set;
- import java.util.concurrent.ExecutorService;
- import java.util.concurrent.Executors;
-
- public class NestedAroundClosureMemoryLeakTest {
-
- private static final int NUM_THREAD_POOLS = 4;
- private static final int THREAD_POOL_SIZE = 3;
-
- public static void main(String[] args) throws Exception {
- testNoMemoryLeak_ThreadLocalCleared();
- }
-
- /**
- * Tests that the thread-locals of the spawned threads are either null or contain all null elements
- */
- public static void testNoMemoryLeak_ThreadLocalCleared() throws Exception {
- List<ExecutorService> executorServices = createExecutorServicesWithFixedThreadPools();
- try {
- executeTasks(executorServices);
-
- Field mapField = Thread.class.getDeclaredField("threadLocals");
- mapField.setAccessible(true);
- Set<Thread> threads = Thread.getAllStackTraces().keySet();
- System.out.println("Number of pool threads = " + threads.stream().filter(thread -> thread.getName().contains("pool")).count());
-
- threads.stream()
- .filter(thread -> thread.getName().contains("pool"))
- .forEach(thread -> {
- try {
- Object threadLocals = mapField.get(thread);
- if (threadLocals != null) {
- Field tableField = threadLocals.getClass().getDeclaredField("table");
- tableField.setAccessible(true);
- Object[] threadLocalTable = (Object[]) tableField.get(threadLocals);
- if (threadLocalTable != null) {
- for (Object entry : threadLocalTable) {
- if (entry == null)
- continue;
- Field entryValueField = entry.getClass().getDeclaredField("value");
- entryValueField.setAccessible(true);
- throw new RuntimeException(
- "All thread-locals should be null, but found entry with value " + entryValueField.get(entry)
- );
- }
- }
- }
- }
- catch (RuntimeException rte) {
- throw rte;
- }
- catch (Exception e) {
- throw new RuntimeException(e);
- }
- });
-
- System.out.println("Test passed - all thread-locals are null");
- }
- finally {
- for (ExecutorService executorService : executorServices)
- executorService.shutdown();
- }
- }
-
- private static List<ExecutorService> createExecutorServicesWithFixedThreadPools() {
- List<ExecutorService> executorServiceList = new ArrayList<>(NestedAroundClosureMemoryLeakTest.NUM_THREAD_POOLS);
- for (int i = 0; i < NestedAroundClosureMemoryLeakTest.NUM_THREAD_POOLS; i++)
- executorServiceList.add(Executors.newFixedThreadPool(THREAD_POOL_SIZE));
- return executorServiceList;
- }
-
- private static void executeTasks(List<ExecutorService> executorServices) throws Exception {
- for (ExecutorService executorService : executorServices) {
- for (int i = 0; i < THREAD_POOL_SIZE * 2; i++)
- new Task(executorService).doSomething();
- }
- System.out.println("Finished executing tasks");
-
- // Sleep to take a memory dump
- // Thread.sleep(500000);
- }
-
- }
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