public QClassLoader scan (boolean forceNewClassLoader)
throws InstanceAlreadyExistsException,
InstanceNotFoundException,
NotCompliantMBeanException,
MalformedURLException,
MBeanRegistrationException
{
if ((!isModified () && !forceNewClassLoader) || !libDir.canRead())
return this;
QClassLoader loader;
if (server.isRegistered (loaderName)) {
server.unregisterMBean (loaderName);
loader = new QClassLoader (server, libDir, loaderName, getParent());
} else
loader = this;
File file[] = libDir.listFiles (this);
for (int i=0; i<file.length; i++) {
try {
loader.addURL (file[i].toURL ());
} catch (MalformedURLException e) {
e.printStackTrace ();
}
}
loader.lastModified = libDir.lastModified ();
server.registerMBean (loader, loaderName);
return loader;
}
private void deploy() {
List startList = new ArrayList();
Iterator iter = dirMap.entrySet().iterator();
try {
while (iter.hasNext() && !shutdown) {
Map.Entry entry = (Map.Entry) iter.next();
File f = (File) entry.getKey();
QEntry qentry = (QEntry) entry.getValue();
long deployed = qentry.getDeployed();
if (deployed == 0) {
if (deploy(f)) {
if (qentry.isQBean()) startList.add(qentry.getInstance());
qentry.setDeployed(f.lastModified());
} else {
// deploy failed, clean up.
iter.remove();
}
} else if (deployed != f.lastModified()) {
undeploy(f);
iter.remove();
loader.forceNewClassLoaderOnNextScan();
}
}
iter = startList.iterator();
while (iter.hasNext()) {
start((ObjectInstance) iter.next());
}
} catch (Exception e) {
log.error("deploy", e);
}
}
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);
}
}