Class: Igniter::Extensions::Contracts::Incremental::Session

Inherits:
Object
  • Object
show all
Defined in:
lib/igniter/extensions/contracts/incremental/session.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(compiled_graph:, profile:) ⇒ Session

Returns a new instance of Session.



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# File 'lib/igniter/extensions/contracts/incremental/session.rb', line 10

def initialize(compiled_graph:, profile:)
  @compiled_graph = compiled_graph
  @profile = profile
  @node_states = {}
  @last_result = nil
end

Instance Attribute Details

#compiled_graph ⇒ Object (readonly)

Returns the value of attribute compiled_graph.



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# File 'lib/igniter/extensions/contracts/incremental/session.rb', line 8

def compiled_graph
  @compiled_graph
end

#profile ⇒ Object (readonly)

Returns the value of attribute profile.



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# File 'lib/igniter/extensions/contracts/incremental/session.rb', line 8

def profile
  @profile
end

Instance Method Details

#run(inputs:) ⇒ Object 



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# File 'lib/igniter/extensions/contracts/incremental/session.rb', line 17

def run(inputs:)
  normalized_inputs = Igniter::Contracts::NamedValues.new(inputs)
  current_values = Igniter::Contracts::MutableNamedValues.new
  current_outputs = Igniter::Contracts::MutableNamedValues.new
  current_states = {}

  changed_nodes = []
  skipped_nodes = []
  backdated_nodes = []
  recomputed_count = 0

  compiled_graph.operations.each do |operation|
    if operation.output?
      current_outputs.write(operation.name, current_values.fetch(operation.name))
      next
    end

    if operation.kind == :input
      state = resolve_input_state(operation, normalized_inputs)
      current_states[operation.name] = state
      current_values.write(operation.name, state.value)
      changed_nodes << operation.name if changed_value?(operation.name, state.value)
      next
    end

    dependency_versions = dependency_names_for(operation).each_with_object({}) do |dependency_name, memo|
      if current_states.key?(dependency_name)
        memo[dependency_name] =
          current_states.fetch(dependency_name).value_version
      end
    end

    previous = @node_states[operation.name]

    if previous && previous.dep_snapshot == dependency_versions
      current_states[operation.name] = previous
      current_values.write(operation.name, previous.value)
      skipped_nodes << operation.name
      next
    end

    handler = profile.runtime_handler(operation.kind)
    value = handler.call(
      operation: operation,
      state: current_values,
      outputs: current_outputs,
      inputs: normalized_inputs,
      profile: profile
    )

    value_version =
      if previous && previous.value == value
        backdated_nodes << operation.name
        previous.value_version
      else
        changed_nodes << operation.name if changed_value?(operation.name, value)
        previous ? previous.value_version + 1 : 1
      end

    current_states[operation.name] = NodeState.new(
      name: operation.name,
      value: value,
      value_version: value_version,
      dep_snapshot: dependency_versions
    )
    current_values.write(operation.name, value)
    recomputed_count += 1
  end

  execution_result = Igniter::Contracts::ExecutionResult.new(
    state: current_values.snapshot,
    outputs: current_outputs.snapshot,
    profile_fingerprint: profile.fingerprint,
    compiled_graph: compiled_graph
  )

  result = Result.new(
    execution_result: execution_result,
    changed_nodes: changed_nodes.uniq,
    skipped_nodes: skipped_nodes.uniq,
    backdated_nodes: backdated_nodes.uniq,
    changed_outputs: changed_outputs_for(execution_result),
    recomputed_count: recomputed_count
  )

  @node_states = current_states.freeze
  @last_result = result
end