Call is a POJO to encapsulate the information required to make a single java
call, including the result of the call (either returned data or exception).
Call() -
Constructor for class uk.ltd.getahead.dwr.Call
The request made by the browser which consists of a number of function call
requests and some associated information like the request mode (XHR or
iframe).
Calls() -
Constructor for class uk.ltd.getahead.dwr.Calls
This class is intended to be used by Logger when commons-logging is
available, but to not force Logger itself to depend on commons-logging so
Logger can catch the ClassDefNotFoundError and use other methods.