Пример #1
0
  /** Utility routine for setting the context class loader. Returns previous class loader. */
  public static ClassLoader setContextClassLoader(ClassLoader newClassLoader) {

    // Can only reference final local variables from dopriveleged block
    final ClassLoader classLoaderToSet = newClassLoader;

    final Thread currentThread = Thread.currentThread();
    ClassLoader originalClassLoader = currentThread.getContextClassLoader();

    if (classLoaderToSet != originalClassLoader) {
      if (System.getSecurityManager() == null) {
        currentThread.setContextClassLoader(classLoaderToSet);
      } else {
        java.security.AccessController.doPrivileged(
            new java.security.PrivilegedAction() {
              public java.lang.Object run() {
                currentThread.setContextClassLoader(classLoaderToSet);
                return null;
              }
            });
      }
    }
    return originalClassLoader;
  }
Пример #2
0
 public void run() {
   started = true;
   Thread.currentThread().setName("Q2-" + getInstanceId().toString());
   try {
     /*
      * The following code determines whether a MBeanServer exists
      * already. If so then the first one in the list is used.
      * I have not yet find a way to interrogate the server for
      * information other than MBeans so to pick a specific one
      * would be difficult.
      */
     ArrayList mbeanServerList = MBeanServerFactory.findMBeanServer(null);
     if (mbeanServerList.isEmpty()) {
       server = MBeanServerFactory.createMBeanServer(JMX_NAME);
     } else {
       server = (MBeanServer) mbeanServerList.get(0);
     }
     final ObjectName loaderName = new ObjectName(Q2_CLASS_LOADER);
     try {
       loader =
           (QClassLoader)
               java.security.AccessController.doPrivileged(
                   new java.security.PrivilegedAction() {
                     public Object run() {
                       return new QClassLoader(server, libDir, loaderName, mainClassLoader);
                     }
                   });
       server.registerMBean(loader, loaderName);
       loader = loader.scan(false);
     } catch (Throwable t) {
       if (log != null) log.error("initial-scan", t);
       else t.printStackTrace();
     }
     factory = new QFactory(loaderName, this);
     initSystemLogger();
     addShutdownHook();
     q2Thread = Thread.currentThread();
     q2Thread.setContextClassLoader(loader);
     if (cli != null) cli.start();
     initConfigDecorator();
     for (int i = 1; !shutdown; i++) {
       try {
         boolean forceNewClassLoader = scan();
         QClassLoader oldClassLoader = loader;
         loader = loader.scan(forceNewClassLoader);
         if (loader != oldClassLoader) {
           oldClassLoader = null; // We want't this to be null so it gets GCed.
           System.gc(); // force a GC
           log.info(
               "new classloader ["
                   + Integer.toString(loader.hashCode(), 16)
                   + "] has been created");
         }
         deploy();
         checkModified();
         relax(SCAN_INTERVAL);
         if (i % (3600000 / SCAN_INTERVAL) == 0) logVersion();
       } catch (Throwable t) {
         log.error("start", t);
         relax();
       }
     }
     undeploy();
     try {
       server.unregisterMBean(loaderName);
     } catch (InstanceNotFoundException e) {
       log.error(e);
     }
     if (decorator != null) {
       decorator.uninitialize();
     }
     if (exit && !shuttingDown) System.exit(0);
   } catch (Exception e) {
     if (log != null) log.error(e);
     else e.printStackTrace();
     System.exit(1);
   }
 }