private synchronized static void init() {
if (wsImpl != null) return;
String implementation = Yalp.configuration.getProperty("webservice", "async");
if (implementation.equals("urlfetch")) {
wsImpl = new WSUrlFetch();
if (Logger.isTraceEnabled()) {
Logger.trace("Using URLFetch for web service");
}
} else if (implementation.equals("async")) {
if (Logger.isTraceEnabled()) {