Ruby 1.9.2 リファレンスマニュアル > ライブラリ一覧 > xmlrpc/serverライブラリ > XMLRPC::BasicServerクラス

class XMLRPC::BasicServer

クラスの継承リスト: XMLRPC::BasicServer < Object < Kernel < BasicObject

Abstract

Is the base class for all XML-RPC server-types (CGI, standalone). You can add handler and set a default handler. Do not use this server, as this is/should be an abstract class.

How the method to call is found

The arity (number of accepted arguments) of a handler (method or Proc object) is compared to the given arguments submitted by the client for a RPC ((-Remote Procedure Call-)). A handler is only called if it accepts the number of arguments, otherwise the search for another handler will go on. When at the end no handler was found, the XMLRPC::BasicServer#set_default_handler will be called. With this technique it is possible to do overloading by number of parameters, but only for Proc handler, because you cannot define two methods of the same name in the same class.

特異メソッド

new(class_delim=".")

Creates a new XMLRPC::BasicServer instance, which should not be done, because XMLRPC::BasicServer is an abstract class. This method should be called from a subclass indirectly by a super call in the method initialize. The paramter class_delim is used in [[mXMLRPC::BasicServer#add_handler]] when an object is added as handler, to delimit the object-prefix and the method-name.

インスタンスメソッド

add_handler(name, signature=nil, help=nil) { aBlock }

Adds aBlock to the list of handlers, with name as the name of the method. Parameters signature and help are used by the Introspection method if specified, where signature is either an Array containing strings each representing a type of it's signature (the first is the return value) or an Array of Arrays if the method has multiple signatures. Value type-names are "int, boolean, double, string, dateTime.iso8601, base64, array, struct".

Parameter help is a String with informations about how to call this method etc.

A handler method or code-block can return the types listed at XMLRPC::Client#call. When a method fails, it can tell it the client by throwing an XMLRPC::FaultException like in this example: 

s.add_handler("michael.div") do |a,b|
  if b == 0
    raise XMLRPC::FaultException.new(1, "division by zero")
  else
    a / b
  end
end

The client gets in the case of b==0 an object back of type XMLRPC::FaultException that has a faultCode and faultString field.

add_handler(prefix, obj)

This is the second form of [[unknown:add_handler|XMLRPC::BasicServer#add_handler]]. To add an object write: 

server.add_handler("michael", MyHandlerClass.new)

All public methods of MyHandlerClass are accessible to the XML-RPC clients by (('michael."name of method"')). This is where the class_delim in [[unknown:new|XMLRPC::BasicServer.new]] has it's role, a XML-RPC method-name is defined by prefix + class_delim + (('"name of method"')).

add_handler(interface, obj)

This is the third form of [[unknown:add_handler|XMLRPC::BasicServer#add_handler]].

Use XMLRPC::interface to generate an ServiceInterface object, which represents an interface (with signature and help text) for a handler class.

Parameter interface must be of type XMLRPC::ServiceInterface. Adds all methods of obj which are defined in interface to the server.

This is the recommended way of adding services to a server!

add_introspection

Adds the introspection handlers "system.listMethods", "system.methodSignature" and "system.methodHelp", where only the first one works.

add_multicall

Adds the multi-call handler "system.multicall".

get_default_handler

Returns the default-handler, which is called when no handler for a method-name is found. It is a Proc object or nil.

get_service_hook

Returns the service-hook, which is called on each service request (RPC) unless it's nil.

set_default_handler(&handler)

Sets handler as the default-handler, which is called when no handler for a method-name is found. handler is a code-block. The default-handler is called with the (XML-RPC) method-name as first argument, and the other arguments are the parameters given by the client-call.

If no block is specified the default of XMLRPC::BasicServer is used, which raises a XMLRPC::FaultException saying "method missing".

set_parser(parser)

Sets the XML parser to use for parsing XML documents. Should be an instance of a class from module XMLRPC::XMLParser. If this method is not called, then XMLRPC::Config::DEFAULT_PARSER is used.

set_service_hook(&handler)

A service-hook is called for each service request (RPC). You can use a service-hook for example to wrap existing methods and catch exceptions of them or convert values to values recognized by XMLRPC. You can disable it by passing nil as parameter handler .

The service-hook is called with a Proc object and with the parameters for this Proc. An example: 

server.set_service_hook {|obj, *args|
  begin
    ret = obj.call(*args)  # call the original service-method
    # could convert the return value
  resuce
    # rescue exceptions
  end
}
set_writer(writer)

Sets the XML writer to use for generating XML output. Should be an instance of a class from module XMLRPC::XMLWriter. If this method is not called, then XMLRPC::Config::DEFAULT_WRITER is used.

Methods

Classes