Class: Configuration::SourceFailover

Inherits:
Scope
  • Object
show all
Includes:
ClassLogging
Defined in:
lib/httpimagestore/configuration/source_failover.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Scope

#initialize, node_parsers, #parse, register_node_parser

Constructor Details

This class inherits a constructor from Configuration::Scope

Class Method Details

.match(node) ⇒ Object 



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# File 'lib/httpimagestore/configuration/source_failover.rb', line 17

def self.match(node)
  node.name == 'source_failover'
end

.parse(configuration, node) ⇒ Object 



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# File 'lib/httpimagestore/configuration/source_failover.rb', line 21

def self.parse(configuration, node)
  # support only sources
  handler_configuration = Struct.new(
    :global,
    :sources
  ).new
  handler_configuration.global = configuration.global
  handler_configuration.sources = []

  failover = self.new(handler_configuration)
  configuration.sources << failover
  failover.parse(node)
end

Instance Method Details

#realize(request_state) ⇒ Object

Raises:



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# File 'lib/httpimagestore/configuration/source_failover.rb', line 35

def realize(request_state)
  errors = []
  @configuration.sources.each do |source|
    begin
      log.debug "trying source: #{source}"
      return source.realize(request_state) unless source.respond_to? :excluded? and source.excluded?(request_state)
    rescue => error
      errors << error
      log.warn "source #{source} failed; trying next source", error
    end
  end
  log.error "all sources: #{@configuration.sources.map(&:to_s).join(', ')} failed; giving up"
  raise SourceFailoverAllFailedError.new(@configuration.sources.to_a, errors)
end