Module: Trailblazer::Activity::DSL::Linear::Compiler

Defined in:
lib/trailblazer/activity/dsl/linear/compiler.rb

Overview

Compile a Schema by computing implementations and intermediate from a Sequence.

Class Method Summary collapse

Class Method Details

.call(sequence, find_stops: method(:find_stop_task_ids), find_start: method(:find_start_task_ids)) ⇒ Object 



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# File 'lib/trailblazer/activity/dsl/linear/compiler.rb', line 19

def call(sequence, find_stops: method(:find_stop_task_ids), find_start: method(:find_start_task_ids))
  _implementations, intermediate_wiring =
    sequence.inject([[], []]) do |(implementations, intermediates), seq_row|
      magnetic_to, task, connections, data = seq_row
      id = data[:id]

      # execute all {Search}s for one sequence row.
      connections = find_connections(seq_row, connections, sequence)

      # FIXME: {:extensions} should be initialized
      implementations += [[id, Schema::Implementation::Task(task, connections.collect { |output, _| output }, data[:extensions] || []) ]]

      intermediates += [
        [
          Schema::Intermediate::TaskRef(id, data),
          # Compute outputs.
          connections.collect { |output, target_id| Schema::Intermediate::Out(output.semantic, target_id) }
        ]
      ]

      [implementations, intermediates]
    end

  start_task_ids = find_start.(intermediate_wiring)
  stop_task_refs = find_stops.(intermediate_wiring)

  intermediate   = Schema::Intermediate.new(Hash[intermediate_wiring], stop_task_refs, start_task_ids)
  implementation = Hash[_implementations]

  Schema::Intermediate.(intermediate, implementation) # implemented in the generic {trailblazer-activity} gem.
end

.find_connections(seq_row, strategies, sequence) ⇒ Object

private



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# File 'lib/trailblazer/activity/dsl/linear/compiler.rb', line 53

def find_connections(seq_row, strategies, sequence)
  strategies.collect do |search|
    output, target_seq_row = search.(sequence, seq_row) # invoke the node's "connection search" strategy.

    target_seq_row = sequence[-1] if target_seq_row.nil? # connect to an End if target unknown. # DISCUSS: make this configurable, maybe?

    [
      output,                                     # implementation
      target_seq_row[3][:id],  # intermediate   # FIXME. this sucks.
      target_seq_row # DISCUSS: needed?
    ]
  end.compact
end

.find_start_task_ids(intermediate_wiring) ⇒ Object

The first task in the wiring is the default start task.



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# File 'lib/trailblazer/activity/dsl/linear/compiler.rb', line 15

def find_start_task_ids(intermediate_wiring)
  [intermediate_wiring.first.first.id]
end

.find_stop_task_ids(intermediate_wiring) ⇒ Object

Default strategy to find out what’s a stop event is to inspect the TaskRef’s :stop_event.



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# File 'lib/trailblazer/activity/dsl/linear/compiler.rb', line 10

def find_stop_task_ids(intermediate_wiring)
  intermediate_wiring.collect { |task_ref, outs| task_ref.data[:stop_event] ? task_ref.id : nil }.compact
end