/** Gets a context associated with current thread */
public static DapCtx ctx() {
DapCtx context = CtxAssociator.getCtx();
if (context == null) {
context = create();
setCtx(context);
}
return context;
}
/** set DapCtx for current thread. */
public void setSameCxtForCurrentThread() {
DapCtx.setCtx(this);
}