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

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

Overview

Compile a Schema by computing implementations and intermediate from a Trailblazer::Activity::DSL::Linear::Sequence.

Class Method Summary collapse

Class Method Details

.call(sequence, find_stops: Compiler.method(:find_termini), find_start: method(:find_start_task)) ⇒ Object 



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# File 'lib/trailblazer/activity/dsl/linear/sequence/compiler.rb', line 22

def call(sequence, find_stops: Compiler.method(:find_termini), find_start: method(:find_start_task))
  config = Activity::Schema::Intermediate::Compiler::DEFAULT_CONFIG

  nodes_attributes = []

  wiring = sequence.collect do |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)

    circuit_connections = connections.collect { |output, target_task| [output.signal, target_task] }.to_h

    extensions = (seq_row[3][:extensions] || [])
    # FIXME: move that to {Intermediate::Compiler}?
    config = extensions.inject(config) { |cfg, ext| ext.(config: cfg, id: id, task: task) } # {ext} must return new config hash.

    # nodes_attributes:
    outputs = connections.keys
    nodes_attributes << [
      id,
      task,
      data,
      outputs
    ]

    [
      task,
      circuit_connections
    ]
  end.to_h

  termini = find_stops.(sequence) # {task => semantic}
  start_task = find_start.(sequence)

  circuit = Trailblazer::Activity::Circuit.new(
    wiring,
    termini.keys, # termini
    start_task: start_task
  )

  # activity_outputs = [Activity::Output(steps[last_step_i], :success)]
  activity_outputs = termini.collect { |terminus, semantic| Activity::Output(terminus, semantic) }


  nodes = Schema::Nodes(nodes_attributes)

  Schema.new(circuit, activity_outputs, nodes, config)
end

.find_connections(seq_row, searches, sequence) ⇒ Object

Execute all search strategies for a row, retrieve outputs and their respective target IDs.



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# File 'lib/trailblazer/activity/dsl/linear/sequence/compiler.rb', line 76

def find_connections(seq_row, searches, sequence)
  searches.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,
      target_seq_row[1]
    ]
  end.to_h
end

.find_start_task(sequence) ⇒ Object 



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# File 'lib/trailblazer/activity/dsl/linear/sequence/compiler.rb', line 18

def find_start_task(sequence)
  sequence[0][1]
end

.find_termini(sequence) ⇒ Object

Default strategy to find out what's a stop event is to inspect the TaskRef's data[:stop_event].



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# File 'lib/trailblazer/activity/dsl/linear/sequence/compiler.rb', line 11

def find_termini(sequence)
  sequence
    .find_all { |_, _, _, data| data[:stop_event] }
    .collect  { |_, task, _, data| [task, data.fetch(:semantic)] }
    .to_h
end