import org.apache.wicket.util.lang.Generics; //导入依赖的package包/类
/**
 *
 * @param throwable
 * <p>
 * @return
 */
private List<Throwable> convertToList(final Throwable throwable) {
	List<Throwable> al = Generics.newArrayList();
	Throwable cause = throwable;
	al.add(cause);
	while ((cause.getCause() != null) && (cause != cause.getCause())) {
		cause = cause.getCause();
		al.add(cause);
	}
	return al;
}
 

import org.apache.wicket.util.lang.Generics; //导入依赖的package包/类
/**
 * @param throwable
 * @return xxx
 */
private List<Throwable> convertToList(final Throwable throwable) {
    List<Throwable> al = Generics.newArrayList();
    Throwable cause = throwable;
    al.add(cause);
    while ((cause.getCause() != null) && (cause != cause.getCause())) {
        cause = cause.getCause();
        al.add(cause);
    }
    return al;
}
 

import org.apache.wicket.util.lang.Generics; //导入依赖的package包/类
@Override
public void setConnection(Application application, String sessionId, IKey key, IWebSocketConnection connection)
{
	Args.notNull(application, "application");
	Args.notNull(sessionId, "sessionId");
	Args.notNull(key, "key");

	ConcurrentMap<String, ConcurrentMap<IKey, IWebSocketConnection>> connectionsBySession = application.getMetaData(KEY);
	if (connectionsBySession == null)
	{
		synchronized (KEY)
		{
			connectionsBySession = application.getMetaData(KEY);
			if (connectionsBySession == null)
			{
				connectionsBySession = Generics.newConcurrentHashMap();
				application.setMetaData(KEY, connectionsBySession);
			}
		}
	}

	ConcurrentMap<IKey, IWebSocketConnection> connectionsByPage = connectionsBySession.get(sessionId);
	if (connectionsByPage == null && connection != null)
	{
		connectionsByPage = connectionsBySession.get(sessionId);
		if (connectionsByPage == null)
		{
			connectionsByPage = Generics.newConcurrentHashMap();
			ConcurrentMap<IKey, IWebSocketConnection> old = connectionsBySession.putIfAbsent(sessionId, connectionsByPage);
			if (old != null)
			{
				connectionsByPage = old;
			}
		}
	}

	if (connection != null)
	{
		connectionsByPage.put(key, connection);
	}
	else if (connectionsByPage != null)
	{
		connectionsByPage.remove(key);
		if (connectionsByPage.isEmpty())
		{
			connectionsBySession.remove(sessionId);
		}
	}
}