// Wait for all threads to complete
        for (Thread thread : threads) {
            thread.join();
        }

        // Check all providers were created successfully
        for (int i = 0; i < threadCount; i++) {
            assertNull("Thread " + i + " threw exception", exceptions[i]);
            assertNotNull("Thread " + i + " failed to create provider", providers[i]);
        }
    }

    @RepeatedTest(10)
    @DisplayName("Test thread safety")
    void testThreadSafety() throws InterruptedException {
        SimpleCircuitBreaker breaker = new SimpleCircuitBreaker("concurrent", 5, 3, 100);
        AtomicInteger successCount = new AtomicInteger(0);
        AtomicInteger failureCount = new AtomicInteger(0);

        // Create multiple threads
        Thread[] threads = new Thread[10];

    }

    /**
     * Cleans up the transport thread.
     *
     * @param timeout the maximum time to wait for thread cleanup in milliseconds
     * @throws TransportException if thread cleanup fails
     */
    private synchronized void cleanupThread(final long timeout) throws TransportException {
        final Thread t = this.thread;
        if (t != null && Thread.currentThread() != t) {
            this.thread = null;

        final int threadCount = 10;
        Thread[] threads = new Thread[threadCount];

        // Create threads that access password
        for (int i = 0; i < threadCount; i++) {
            final int index = i;
            threads[i] = new Thread(() -> {
                try {
                    Thread.sleep((long) (Math.random() * 10));
                    if (index == threadCount - 1) {

            } else {
                t.url = args[ai];
            }
        }

        final Thread[] threads = new Thread[t.numThreads];
        int ti;

        for (ti = 0; ti < t.numThreads; ti++) {
            threads[ti] = new Thread(t);
            logger.info(threads[ti].getName());
            threads[ti].start();
        }

        while (t.numComplete < t.numThreads) {
            long delay;

    }

    // Test constructor with different thread context
    public void test_constructorInDifferentThread() throws Exception {
        // Test that constructor works in different thread
        final CrawlerEngineClient[] clientHolder = new CrawlerEngineClient[1];
        final Exception[] exceptionHolder = new Exception[1];

        Thread thread = new Thread(() -> {
            try {

                null);

        assertFalse(durableInfo.isExpired());

        // Wait for expiration
        try {
            Thread.sleep(150);
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        }

        assertTrue(durableInfo.isExpired());

        // Test persistent handle (never expires)

    service.setPort(9200);
});
```

## Performance Tuning

### Thread Configuration

```java
// Optimize thread pool settings
crawler.crawlerContext.setNumOfThread(20);           // Number of crawler threads
crawler.crawlerContext.setMaxThreadCheckCount(50);   // Thread monitoring frequency
```

### Connection Pool Tuning

```java

                        successCount.incrementAndGet();
                    }
                } catch (InterruptedException e) {
                    Thread.currentThread().interrupt();
                } finally {
                    endLatch.countDown();
                }
            }
        });

        Thread thread2 = new Thread(new Runnable() {

        Thread thread2 = new Thread(() -> {
            Throwable result = exception.fillInStackTrace();
            assertNull(result);
        });

        thread1.start();
        thread2.start();

        try {
            thread1.join();
            thread2.join();
        } catch (InterruptedException e) {
            fail("Thread interrupted");
        }
    }