How does ServiceLoader and services behave in multithreaded code?

The ServiceLoader is a powerful facility provided in Java to load services at runtime. When it comes to multithreaded environments, it is crucial to understand how ServiceLoader behaves to avoid unexpected issues or performance bottlenecks.

In a multithreaded scenario, it is essential to note that the ServiceLoader is generally not thread-safe. This means that if multiple threads attempt to load services simultaneously, it may lead to inconsistent results or even exceptions. To integrate ServiceLoader safely in a multithreaded application, it is advisable to synchronize access to the ServiceLoader instance or the code section that utilizes it.

Here's an example illustrating how to handle ServiceLoader in a multithreaded manner:


    import java.util.ServiceLoader;

    public class MyService {
        public void execute() {
            System.out.println("Service executed.");
        }
    }

    public class ServiceConsumer {
        private static final Object lock = new Object();
        private static ServiceLoader serviceLoader;

        public static void loadServices() {
            synchronized (lock) {
                if (serviceLoader == null) {
                    serviceLoader = ServiceLoader.load(MyService.class);
                }
            }
        }

        public void performService() {
            loadServices();
            for (MyService service : serviceLoader) {
                service.execute();
            }
        }
    }

ServiceLoader Java multithreading thread-safe loading services Java services

How does ServiceLoader and services behave in multithreaded code?

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How does ServiceLoader and services behave in multithreaded code?

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