Class: Believer::Command

Inherits:
Object
  • Object
show all
Defined in:
lib/believer/command.rb

Direct Known Subclasses

Batch, CreateTable, DropTable, FilterCommand, Insert

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(attrs = {}) ⇒ Command

Returns a new instance of Command.



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# File 'lib/believer/command.rb', line 6

def initialize(attrs = {})
  attrs.each do |name, value|
    send("#{name}=", value)
  end if attrs.present?
  #@instrumenter = ActiveSupport::Notifications.instrumenter
end

Instance Attribute Details

#consistency_level ⇒ Object

Returns the value of attribute consistency_level.



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# File 'lib/believer/command.rb', line 4

def consistency_level
  @consistency_level
end

#execution_options ⇒ Object

Returns the value of attribute execution_options.



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# File 'lib/believer/command.rb', line 4

def execution_options
  @execution_options
end

#record_class ⇒ Object

Returns the value of attribute record_class.



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# File 'lib/believer/command.rb', line 4

def record_class
  @record_class
end

Instance Method Details

#can_execute? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/believer/command.rb', line 31

def can_execute?
  true
end

#clone ⇒ Object 



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# File 'lib/believer/command.rb', line 13

def clone
  self.class.new(query_attributes)
end

#command_name ⇒ Object 



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# File 'lib/believer/command.rb', line 27

def command_name
  self.class.name.split('::').last.underscore
end

#consistency(level) ⇒ Object 



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# File 'lib/believer/command.rb', line 17

def consistency(level)
  c = clone
  c.consistency_level = level
  c
end

#execute(name = nil) ⇒ Object 



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# File 'lib/believer/command.rb', line 35

def execute(name = nil)
  return false unless can_execute?

  @record_class.connection_pool.with do |connection|
    cql = to_cql
    begin
      name = "#{record_class.name} #{command_name}" if name.nil?
      return ActiveSupport::Notifications.instrument('cql.believer', :cql => cql, :name => name) do

        #unless consistency_level.nil? || consistency_level.empty?
        #  exec_opts ||= {}
        #  exec_opts[:consistency] = consistency_level
        #end
        exec_opts = execution_options || {}
        begin
          return connection.execute(cql, exec_opts)
        rescue Cql::NotConnectedError => not_connected
          connection.connect
          return connection.execute(cql, exec_opts)
        end
      end
    rescue Cql::Protocol::DecodingError => e
      # Decoding errors tend to #$%# up the connection, resulting in no more activity, so a reconnect is performed here.
      # This is a known issue in cql-rb, and will be fixed in version 1.10
      @record_class.reset_connection(connection)
      raise e
    end
  end

end

#query_attributes ⇒ Object 



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# File 'lib/believer/command.rb', line 23

def query_attributes
  {:record_class => @record_class, :consistency_level => @consistency_level}
end