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|
module Groonga
module Sharding
class LogicalTableRemoveCommand < Command
register("logical_table_remove",
[
"logical_table",
"shard_key",
"min",
"min_border",
"max",
"max_border",
"dependent",
"force",
])
def run_body(input)
@dependent = (input[:dependent] == "yes")
@force = (input[:force] == "yes")
enumerator = LogicalEnumerator.new("logical_table_remove", input)
success = true
enumerator.each do |shard, shard_range|
remove_shard(shard, shard_range, enumerator.target_range)
end
writer.write(success)
end
private
def remove_shard(shard, shard_range, target_range)
cover_type = target_range.cover_type(shard_range)
return if cover_type == :none
shard_key = shard.key
if shard_key.nil?
if @force
context.clear_error
else
message =
"[logical_table_remove] shard_key doesn't exist: " +
"<#{shard.key_name}>"
raise InvalidArgument, message
end
end
table = shard.table
if cover_type == :all or ((table.nil? or shard_key.nil?) and @force)
remove_table(shard, table)
return
end
expression_builder = RangeExpressionBuilder.new(shard_key,
target_range)
case cover_type
when :partial_min
remove_records(table) do |expression|
expression_builder.build_partial_min(expression)
end
remove_table(shard, table) if table.empty?
when :partial_max
remove_records(table) do |expression|
expression_builder.build_partial_max(expression)
end
remove_table(shard, table) if table.empty?
when :partial_min_and_max
remove_records(table) do |expression|
expression_builder.build_partial_min_and_max(expression)
end
remove_table(shard, table) if table.empty?
end
end
def collect_referenced_table_ids_from_index_ids(index_ids,
referenced_table_ids)
database = context.database
index_ids.each do |index_id|
index = context[index_id]
if index.nil?
context.clear_error
index_name = database[index_id]
lexicon_name = index_name.split(".", 2)[0]
lexicon_id = database[lexicon_name]
referenced_table_ids << lexicon_id if lexicon_id
else
referenced_table_ids << index.domain_id
end
end
end
def collect_referenced_table_ids_from_column_name(column_name,
referenced_table_ids)
database = context.database
column_id = database[column_name]
database.each_raw do |id, cursor|
next if ID.builtin?(id)
next if id == column_id
context.open_temporary(id) do |object|
if object.nil?
context.clear_error
next
end
case object
when IndexColumn
if object.source_ids.include?(column_id)
collect_referenced_table_ids_from_index_ids([id],
referenced_table_ids)
end
end
end
end
end
def collect_referenced_table_ids_from_column(column,
referenced_table_ids)
range = column.range
case range
when nil
context.clear_error
when Table
referenced_table_ids << range.id
collect_referenced_table_ids_from_index_ids(range.index_ids,
referenced_table_ids)
end
collect_referenced_table_ids_from_index_ids(column.index_ids,
referenced_table_ids)
end
def collect_referenced_table_ids_from_column_names(column_names)
referenced_table_ids = []
column_names.each do |column_name|
column = context[column_name]
if column.nil?
context.clear_error
collect_referenced_table_ids_from_column_name(column_name,
referenced_table_ids)
else
collect_referenced_table_ids_from_column(column,
referenced_table_ids)
end
end
referenced_table_ids
end
def collect_referenced_table_ids(shard, table)
return [] unless @dependent
column_names = nil
if table
begin
column_names = table.columns.collect(&:name)
rescue
context.clear_error
end
end
if column_names.nil?
prefix = "#{shard.table_name}."
column_names = []
context.database.each_name(:prefix => prefix) do |column_name|
column_names << column_name
end
end
collect_referenced_table_ids_from_column_names(column_names)
end
def remove_table(shard, table)
if table.nil?
unless @force
if context.rc == Context::RC::SUCCESS.to_i
error_class = InvalidArgument
else
rc = Context::RC.find(context.rc)
error_class = rc.error_class
end
message = "[logical_table_remove] table is broken: " +
"<#{shard.table_name}>: #{context.error_message}"
raise error_class, message
end
context.clear_error
end
referenced_table_ids = collect_referenced_table_ids(shard, table)
if table.nil?
remove_table_force(shard.table_name)
else
table.remove(dependent: @dependent, ensure: @force)
end
remove_referenced_tables(shard, referenced_table_ids)
end
def remove_table_force(table_name)
context.remove(table_name, dependent: true, ensure: true)
end
def remove_referenced_tables(shard, referenced_table_ids)
return if referenced_table_ids.empty?
database = context.database
shard_suffix = shard.range_data.to_suffix
referenced_table_ids.uniq.each do |referenced_table_id|
referenced_table_name = database[referenced_table_id]
next if referenced_table_name.nil?
next unless referenced_table_name.end_with?(shard_suffix)
context.remove(referenced_table_id,
dependent: @dependent,
ensure: true)
end
end
def remove_records(table)
expression = nil
begin
expression = Expression.create(table)
yield(expression)
table.delete(:expression => expression)
ensure
expression.close if expression
end
end
end
end
end
|
