Class: ServiceResult

Inherits:
Object
  • Object
show all
Defined in:
lib/generators/service/install/templates/services/service_result.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ServiceResult

Returns a new instance of ServiceResult.



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# File 'lib/generators/service/install/templates/services/service_result.rb', line 6

def initialize
  @value = yield
  @error = nil
rescue StandardError => e
  @error = e
end

Instance Attribute Details

#error ⇒ Object (readonly)

Returns the value of attribute error.



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# File 'lib/generators/service/install/templates/services/service_result.rb', line 4

def error
  @error
end

Class Method Details

.error(err) ⇒ Object 



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# File 'lib/generators/service/install/templates/services/service_result.rb', line 59

def self.error(err)
  result = allocate
  result.instance_variable_set(:@error, err)
  result
end

Instance Method Details

#ok? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/generators/service/install/templates/services/service_result.rb', line 55

def ok?
  !@error
end

#rescue ⇒ Object

Raises:

  • (TypeError) 


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# File 'lib/generators/service/install/templates/services/service_result.rb', line 32

def rescue
  return self if ok?

  result = yield(@error)
  raise TypeError, 'block invoked in Result#rescue did not return Result' unless result.is_a?(Result)

  result
end

#then ⇒ Object

Raises:

  • (TypeError) 


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# File 'lib/generators/service/install/templates/services/service_result.rb', line 23

def then
  return self unless ok?

  result = yield(@value)
  raise TypeError, 'block invoked in Result#then did not return Result' unless result.is_a?(Result)

  result
end

#to_s ⇒ Object Also known as: inspect 



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# File 'lib/generators/service/install/templates/services/service_result.rb', line 13

def to_s
  if ok?
    format('#<Result:0x%x value: %s>', object_id, @value.inspect)
  else
    format('#<Result:0x%x error: %s>', object_id, @error.inspect)
  end
end

#value {|@error| ... } ⇒ Object

Yields:

Raises:

  • (ArgumentError) 


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# File 'lib/generators/service/install/templates/services/service_result.rb', line 41

def value
  raise ArgumentError, 'must provide a block to Result#value to be invoked in case of error' unless block_given?

  return @value if ok?

  yield(@error)
end

#value! ⇒ Object

Raises:



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# File 'lib/generators/service/install/templates/services/service_result.rb', line 49

def value!
  raise @error unless ok?

  @value
end