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Merge pull request #85 from socialcast/atomic-swap
Atomic swap
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,166 +1,9 @@ | ||
| require 'active_support' | ||
| require 'active_support/core_ext/numeric/time' | ||
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| require 'masamune/data_plan_set' | ||
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| class Masamune::DataPlan | ||
| MAX_DEPTH = 10 | ||
|
|
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| include Masamune::HasEnvironment | ||
| include Masamune::Accumulate | ||
|
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| def initialize | ||
| @target_rules = Hash.new | ||
| @source_rules = Hash.new | ||
| @command_rules = Hash.new | ||
| @targets = Hash.new { |set,rule| set[rule] = Masamune::DataPlanSet.new(@target_rules[rule]) } | ||
| @sources = Hash.new { |set,rule| set[rule] = Masamune::DataPlanSet.new(@source_rules[rule]) } | ||
| @set_cache = Hash.new { |cache,level| cache[level] = Hash.new } | ||
| @current_rule = nil | ||
| @current_depth = 0 | ||
| end | ||
|
|
||
| def filesystem | ||
| @filesystem ||= Masamune::CachedFilesystem.new(environment.filesystem) | ||
| end | ||
|
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| def add_target_rule(rule, target_options = {}) | ||
| @target_rules[rule] = Masamune::DataPlanRule.new(self, rule, :target, target_options) | ||
| end | ||
|
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| def get_target_rule(rule) | ||
| @target_rules[rule] | ||
| end | ||
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| def add_source_rule(rule, source_options = {}) | ||
| @source_rules[rule] = Masamune::DataPlanRule.new(self, rule, :source, source_options) | ||
| end | ||
|
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| def get_source_rule(rule) | ||
| @source_rules[rule] | ||
| end | ||
|
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| def add_command_rule(rule, command) | ||
| @command_rules[rule] = command | ||
| end | ||
|
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| # TODO use constructed reference instead | ||
| def rule_for_target(target) | ||
| target_matches = @target_rules.select { |rule, matcher| matcher.primary? && matcher.matches?(target) } | ||
| source_matches = @source_rules.select { |rule, matcher| matcher.matches?(target) } | ||
|
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||
| if target_matches.empty? | ||
| if source_matches.empty? | ||
| raise "No rule matches target #{target}" | ||
| else | ||
| Masamune::DataPlanRule::TERMINAL | ||
| end | ||
| else | ||
| logger.error("Multiple rules match target #{target}") if target_matches.length > 1 | ||
| target_matches.map(&:first).first | ||
| end | ||
| end | ||
|
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||
| def targets_for_date_range(rule, start, stop, &block) | ||
| target_template = @target_rules[rule] | ||
| return unless target_template | ||
| target_template.generate(start.to_time.utc, stop.to_time.utc) do |target| | ||
| yield target | ||
| end | ||
| end | ||
| method_accumulate :targets_for_date_range, lambda { |plan, rule, _, _| Masamune::DataPlanSet.new(plan.get_target_rule(rule)) } | ||
|
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| def targets_for_source(rule, source, &block) | ||
| source_template = @source_rules[rule] | ||
| target_template = @target_rules[rule] | ||
| source_instance = source.is_a?(Masamune::DataPlanElem) ? source : source_template.bind_input(source) | ||
| source_template.generate_via_unify(source_instance, target_template) do |target| | ||
| yield target | ||
| end | ||
| end | ||
| method_accumulate :targets_for_source, lambda { |plan, rule, source| Masamune::DataPlanSet.new(plan.get_target_rule(rule)) } | ||
|
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||
| def sources_for_target(rule, target, &block) | ||
| source_template = @source_rules[rule] | ||
| target_template = @target_rules[rule] | ||
| target_instance = target.is_a?(Masamune::DataPlanElem) ? target : target_template.bind_input(target) | ||
| target_template.generate_via_unify(target_instance, source_template) do |source| | ||
| yield source | ||
| end | ||
| end | ||
| method_accumulate :sources_for_target, lambda { |plan, rule, target| Masamune::DataPlanSet.new(plan.get_source_rule(rule)) } | ||
|
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| def targets(rule) | ||
| @set_cache[:targets_for_rule][rule] ||= @targets[rule].union(@sources[rule].targets) | ||
| end | ||
|
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| def sources(rule) | ||
| @set_cache[:sources_for_rule][rule] ||= @sources[rule].union(@targets[rule].sources).adjacent | ||
| end | ||
|
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| def prepare(rule, options = {}) | ||
| @targets[rule].merge options.fetch(:targets, []) | ||
| @sources[rule].merge options.fetch(:sources, []) | ||
|
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| dirty = false | ||
| targets(rule).incomplete do |target| | ||
| if target.removable? | ||
| logger.warn("Detected incomplete target #{target.input}, removing") | ||
| target.remove | ||
| dirty = true | ||
| end | ||
| end | ||
|
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||
| targets(rule).stale do |target| | ||
| if target.removable? | ||
| logger.warn("Detected stale target #{target.input}, removing") | ||
| target.remove | ||
| dirty = true | ||
| else | ||
| logger.warn("Detected stale target #{target.input}, skipping") | ||
| end | ||
| end | ||
|
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| clear! if dirty | ||
|
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| constrain_max_depth(rule) do | ||
| sources(rule).group_by { |source| rule_for_target(source.input) }.each do |derived_rule, sources| | ||
| prepare(derived_rule, targets: sources.map(&:input)) if derived_rule != Masamune::DataPlanRule::TERMINAL | ||
| end | ||
| end if options.fetch(:resolve, true) | ||
| end | ||
|
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| def execute(rule, options = {}) | ||
| return if targets(rule).missing.empty? | ||
|
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| constrain_max_depth(rule) do | ||
| sources(rule).missing.group_by { |source| rule_for_target(source.input) }.each do |derived_rule, sources| | ||
| execute(derived_rule, options) if derived_rule != Masamune::DataPlanRule::TERMINAL | ||
| end | ||
| end if options.fetch(:resolve, true) | ||
|
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| @current_rule = rule | ||
| @command_rules[rule].call(self, rule, options) | ||
| clear! | ||
| ensure | ||
| @current_rule = nil | ||
| end | ||
|
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| def current_rule | ||
| @current_rule | ||
| end | ||
|
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| def constrain_max_depth(rule, &block) | ||
| @current_depth += 1 | ||
| raise "Max depth of #{MAX_DEPTH} exceeded for rule '#{rule}'" if @current_depth > MAX_DEPTH | ||
| yield | ||
| ensure | ||
| @current_depth -= 1 | ||
| end | ||
|
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| def clear! | ||
| @set_cache.clear | ||
| filesystem.clear! | ||
| environment.postgres_helper.clear! | ||
| module Masamune | ||
| module DataPlan | ||
| require 'masamune/data_plan/builder' | ||
| require 'masamune/data_plan/elem' | ||
| require 'masamune/data_plan/engine' | ||
| require 'masamune/data_plan/rule' | ||
| require 'masamune/data_plan/set' | ||
| end | ||
| end |
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