Class: PartitionGardener::GapDetection

Inherits:
Object
  • Object
show all
Defined in:
lib/partition_gardener/gap_detection.rb

Defined Under Namespace

Classes: Gap

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(table_name, config: nil) ⇒ GapDetection

Returns a new instance of GapDetection.



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# File 'lib/partition_gardener/gap_detection.rb', line 9

def initialize(table_name, config: nil)
  @table_name = table_name
  @config = config || Registry.find_by_table_name(table_name)
end

Class Method Details

.call(table_name, config: Registry.find_by_table_name(table_name)) ⇒ Object 



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# File 'lib/partition_gardener/gap_detection.rb', line 5

def self.call(table_name, config: Registry.find_by_table_name(table_name))
  new(table_name, config: config).call
end

Instance Method Details

#call ⇒ Object 



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# File 'lib/partition_gardener/gap_detection.rb', line 14

def call
  return [] unless @config

  strategy = Strategy.for(@config)
  return [] unless range_layout?(strategy)

  segments = strategy.attached_tail_segments
  return [] if segments.empty?

  sorted = segments.sort_by { |segment| [segment.range_start.to_s, segment.name] }
  gaps = []

  sorted.each_cons(2) do |left, right|
    left_end = normalize_range_end(left.range_end)
    right_start = right.range_start
    next if left_end == right_start

    gaps << Gap.new(
      range_start: left_end,
      range_end: right_start,
      message: "uncovered range between #{left.name} and #{right.name} (#{left_end}..#{right_start})"
    )
  end

  unless sorted.any? { |segment| segment.range_end == :max }
    gaps << Gap.new(
      range_start: sorted.last.range_end,
      range_end: :max,
      message: "no attached tail partition extends to MAXVALUE"
    )
  end

  gaps
end