/** 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; }
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); } }