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# frozen_string_literal: true
module Gitlab
module Database
module Partitioning
class SlidingListStrategy
attr_reader :model, :partitioning_key, :next_partition_if, :detach_partition_if
delegate :table_name, to: :model
def initialize(model, partitioning_key, next_partition_if:, detach_partition_if:)
@model = model
@partitioning_key = partitioning_key
@next_partition_if = next_partition_if
@detach_partition_if = detach_partition_if
ensure_partitioning_column_ignored!
end
def current_partitions
Gitlab::Database::PostgresPartition.for_parent_table(table_name).map do |partition|
SingleNumericListPartition.from_sql(table_name, partition.name, partition.condition)
end.sort
end
def missing_partitions
if no_partitions_exist?
[initial_partition]
elsif next_partition_if.call(active_partition.value)
[next_partition]
else
[]
end
end
def initial_partition
SingleNumericListPartition.new(table_name, 1)
end
def next_partition
SingleNumericListPartition.new(table_name, active_partition.value + 1)
end
def extra_partitions
possibly_extra = current_partitions[0...-1] # Never consider the most recent partition
possibly_extra.take_while { |p| detach_partition_if.call(p.value) }
end
def after_adding_partitions
active_value = active_partition.value
model.connection.change_column_default(model.table_name, partitioning_key, active_value)
end
def active_partition
# The current partitions list is sorted, so the last partition has the highest value
# This is the only partition that receives inserts.
current_partitions.last
end
def no_partitions_exist?
current_partitions.empty?
end
private
def ensure_partitioning_column_ignored!
unless model.ignored_columns.include?(partitioning_key.to_s)
raise "Add #{partitioning_key} to #{model.name}.ignored_columns to use it with SlidingListStrategy"
end
end
end
end
end
end
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