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  • ruby-3.1.2/lib/drb/drb.rb

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DRb::DRbUnknown

Class wrapping a marshalled object whose type is unknown locally.

If an object is returned by a method invoked over drb, but the class of the object is unknown in the client namespace, or the object is a constant unknown in the client namespace, then the still-marshalled object is returned wrapped in a DRbUnknown instance.

If this object is passed as an argument to a method invoked over drb, then the wrapped object is passed instead.

The class or constant name of the object can be read from the name attribute. The marshalled object is held in the buf attribute.

Attributes

buf[R]

Buffer contained the marshalled, unknown object.

name[R]

The name of the unknown thing.

Class name for unknown objects; variable name for unknown constants.

Public Class Methods

new(err, buf) click to toggle source

Create a new DRbUnknown object.

buf is a string containing a marshalled object that could not be unmarshalled. err is the error message that was raised when the unmarshalling failed. It is used to determine the name of the unmarshalled object.

 
               # File ruby-3.1.2/lib/drb/drb.rb, line 464
def initialize(err, buf)
  case err.to_s
  when /uninitialized constant (\S+)/
    @name = $1
  when /undefined class\/module (\S+)/
    @name = $1
  else
    @name = nil
  end
  @buf = buf
end

Public Instance Methods

exception() click to toggle source

Create a DRbUnknownError exception containing this object.

 
               # File ruby-3.1.2/lib/drb/drb.rb, line 507
def exception
  DRbUnknownError.new(self)
end
reload() click to toggle source

Attempt to load the wrapped marshalled object again.

If the class of the object is now known locally, the object will be unmarshalled and returned. Otherwise, a new but identical DRbUnknown object will be returned.

 
               # File ruby-3.1.2/lib/drb/drb.rb, line 502
def reload
  self.class._load(@buf)
end