Class: HashPipe::ArchivedAttribute

Inherits:
Object
  • Object
show all
Defined in:
lib/hashpipe/archived_attribute.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, instance, opts = {}) ⇒ ArchivedAttribute

Returns a new instance of ArchivedAttribute.



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# File 'lib/hashpipe/archived_attribute.rb', line 12

def initialize(name, instance, opts = {})
  @name     = name
  @instance = instance
  @dirty    = false

  @_options = HashPipe::GlobalConfiguration.instance.to_hash.
    merge(opts)

  @backend = instantiate_backend_from(options)
end

Instance Attribute Details

#instance ⇒ Object (readonly)

Returns the value of attribute instance.



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# File 'lib/hashpipe/archived_attribute.rb', line 10

def instance
  @instance
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/hashpipe/archived_attribute.rb', line 10

def name
  @name
end

Instance Method Details

#destroy ⇒ Object 



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# File 'lib/hashpipe/archived_attribute.rb', line 46

def destroy
  @backend.destroy
end

#dirty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/hashpipe/archived_attribute.rb', line 36

def dirty?
  @dirty
end

#instantiate_backend_from(options) ⇒ Object

Returns a backend object based on the options given (e.g., filesystem, s3).



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# File 'lib/hashpipe/archived_attribute.rb', line 52

def instantiate_backend_from(options)
  "HashPipe::Backends::#{options[:storage].to_s.camelize}".
    constantize.new(self)
end

#options ⇒ Object 



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# File 'lib/hashpipe/archived_attribute.rb', line 57

def options
  @_options
end

#save ⇒ Object

First saves this record to the back-end. If backend storage raises an error, we capture it and add it to the AR validation errors.



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# File 'lib/hashpipe/archived_attribute.rb', line 42

def save
  @backend.save(@stashed_value) if self.dirty?
end

#value ⇒ Object 



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# File 'lib/hashpipe/archived_attribute.rb', line 23

def value
  val = defined?(@stashed_value) ? @stashed_value : @backend.load
  val = compress? ? Zlib::Inflate.inflate(val) : val
  val = marshal? ? Marshal.load(val) : val
end

#value=(other) ⇒ Object 



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# File 'lib/hashpipe/archived_attribute.rb', line 29

def value=(other)
  other = marshal? ? Marshal.dump(other) : other
  other = compress? && !other.nil? ? Zlib::Deflate.deflate(other) : other
  @stashed_value = other
  @dirty = true
end