Java - 如何让logger在shutdown hook中工作？

Question

我有一个专门的记录器类,它使用java.util.logging.Logger该类.我希望能够在另一个类的关闭钩子中使用此记录器.但是,它似乎不会在关机时登录.根据我的阅读,可能已经为记录器本身激活了一个关闭钩子,这导致了问题.

我怎样才能让它发挥作用？理想情况下,我希望在日志文件中看到我实际上在进程终止时执行了shutdown钩子.

Answer 1

再次查看源代码,解决方案似乎是定义一个系统属性java.util.logging.manager,它是LogManager的一个子类,它覆盖了该reset();方法,因此Logger继续在关闭时工作.

import java.util.logging.LogManager;
import java.util.logging.Logger;

public class Main {
    static {
        // must be called before any Logger method is used.
        System.setProperty("java.util.logging.manager", MyLogManager.class.getName());
    }

    public static class MyLogManager extends LogManager {
        static MyLogManager instance;
        public MyLogManager() { instance = this; }
        @Override public void reset() { /* don't reset yet. */ }
        private void reset0() { super.reset(); }
        public static void resetFinally() { instance.reset0(); }
    }

    public static void main(String... args) {
        Logger logger1 = Logger.getLogger("Main1");
        logger1.info("Before shutdown");
        Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Logger logger2 = Logger.getLogger("Main2");
                    logger2.info("Shutting down 2");

                } finally {
                    MyLogManager.resetFinally();
                }
            }
        }));
    }
}

版画

Dec 11, 2012 5:56:55 PM Main main
INFO: Before shutdown
Dec 11, 2012 5:56:55 PM Main$1 run
INFO: Shutting down 2

从LogManager的这段代码中,您可以看到有一个关闭钩子,它会拆除处理程序并关闭它们.如果之前没有使用过Logger,则Logger仅在关闭时工作,因此不运行此代码.

// This private class is used as a shutdown hook.
// It does a "reset" to close all open handlers.
private class Cleaner extends Thread {

    private Cleaner() {
        /* Set context class loader to null in order to avoid
         * keeping a strong reference to an application classloader.
         */
        this.setContextClassLoader(null);
    }

    public void run() {
        // This is to ensure the LogManager.<clinit> is completed
        // before synchronized block. Otherwise deadlocks are possible.
        LogManager mgr = manager;

        // If the global handlers haven't been initialized yet, we
        // don't want to initialize them just so we can close them!
        synchronized (LogManager.this) {
            // Note that death is imminent.
            deathImminent = true;
            initializedGlobalHandlers = true;
        }

        // Do a reset to close all active handlers.
        reset();
    }
}


/**
 * Protected constructor.  This is protected so that container applications
 * (such as J2EE containers) can subclass the object.  It is non-public as
 * it is intended that there only be one LogManager object, whose value is
 * retrieved by calling Logmanager.getLogManager.
 */
protected LogManager() {
    // Add a shutdown hook to close the global handlers.
    try {
        Runtime.getRuntime().addShutdownHook(new Cleaner());
    } catch (IllegalStateException e) {
        // If the VM is already shutting down,
        // We do not need to register shutdownHook.
    }
}

从我自己的测试

Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
    @Override
    public void run() {
        try {
            Logger logger2 = Logger.getLogger("Main2");
            logger2.info("Shutting down 2");
        } catch (Throwable t) {
            t.printStackTrace();
        }
    }
}));

版画

Dec 11, 2012 5:40:15 PM Main$1 run
INFO: Shutting down 2

但如果你加

Logger logger1 = Logger.getLogger("Main1");

在这个街区之外你什么也得不到