Module: Autodeps

Defined in:
lib/autodeps.rb,
lib/autodeps/version.rb,
lib/autodeps/autodeps.rb,
lib/autodeps/dependency.rb,
lib/autodeps/computation.rb,
lib/autodeps/persistency.rb,
lib/autodeps/reactive_data.rb

Defined Under Namespace

Modules: Persistency Classes: Computation, Dependency, ReactiveData

Constant Summary collapse

VERSION = 
"0.0.2"

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.active ⇒ Object

Returns the value of attribute active.



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# File 'lib/autodeps/autodeps.rb', line 13

def active
  @active
end

.logger ⇒ Object

Returns the value of attribute logger.



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# File 'lib/autodeps/autodeps.rb', line 4

def logger
  @logger
end

Class Method Details

.add_pending_computation(pending_computation) ⇒ Object 



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# File 'lib/autodeps/autodeps.rb', line 14

def add_pending_computation(pending_computation)
  @pending_computations << pending_computation
end

.afterFlush(&f) ⇒ Object 



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# File 'lib/autodeps/autodeps.rb', line 92

def afterFlush(&f)
  @after_flush_callbacks.push(f);
end

.autorun(&block) ⇒ Object 



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# File 'lib/autodeps/autodeps.rb', line 18

def autorun(&block)
  raise 'Autodeps.autorun requires a block' if block.nil?

  @constructingComputation = true
  c = Computation.new(block, Autodeps.current_computation);


  if (Autodeps.active)
    Autodeps.on_invalidate do
      c.stop();
    end
  end

  return c
end

.current_computation ⇒ Object 



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# File 'lib/autodeps/autodeps.rb', line 199

def current_computation
  Thread.current["Autodeps::current_computation"]
end

.current_computation=(computation) ⇒ Object 



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# File 'lib/autodeps/autodeps.rb', line 202

def current_computation= (computation)
  Thread.current["Autodeps::current_computation"] = computation
  self.active = !! computation;
end

.embox(equals = nil, &func) ⇒ Object 



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# File 'lib/autodeps/autodeps.rb', line 118

def embox(equals=nil, &func)
  raise "must define a block in embox" unless func


  curResult = nil;
  #There's one shared Dependency and Computation for all callers of

  # our box function.  It gets kicked off if necessary, and when
  # there are no more dependents, it gets stopped to avoid leaking
  # memory.
  resultDep = nil;
  computation = nil;

  return proc do
    if (!computation)
      if (!Autodeps.active)
        # Not in a reactive context.  Just call func, and don't start a
        # computation if there isn't one running already.
        break func.call();
      end

      # No running computation, so kick one off.  Since this computation
      # will be shared, avoid any association with the current computation
      # by using `Deps.nonreactive`.
      resultDep = Autodeps::Dependency.new;

      computation = Autodeps.nonreactive do
        break Autodeps.autorun do |c|
          oldResult = curResult;
          curResult = func.call();
          if (!c.first_run)
            if (!(equals ? equals.call(curResult, oldResult) :
                curResult == oldResult))
              resultDep.changed();
            end
          end
        end
      end
    end

    if (Autodeps.active)
      is_new = resultDep.depend();
      if (is_new)
        # For each new dependent, schedule a task for after that dependents
        # invalidation time and the subsequent flush. The task checks
        # whether the computation should be torn down.
        Autodeps.on_invalidate do
          if (resultDep && !resultDep.hasDependents())
            Autodeps.afterFlush do
              # use a second afterFlush to bump ourselves to the END of the
              # flush, after computation re-runs have had a chance to
              # re-establish their connections to our computation.
              Autodeps.afterFlush do
                if (resultDep && !resultDep.hasDependents())
                  computation.stop();
                  computation = nil;
                  resultDep = nil;
                end
              end
            end
          end
        end
      end
    end

    curResult
  end
end

.embox_value(value, equals = nil) ⇒ Object 



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# File 'lib/autodeps/autodeps.rb', line 187

def embox_value(value, equals=nil)
   raise "embox_value on a direct value not implemented"
end

.flush ⇒ Object 



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# File 'lib/autodeps/autodeps.rb', line 44

def flush

  #if (inFlush)
  #  throw new Error("Can't call Deps.flush while flushing");
  #
  #  if (inCompute)
  #    throw new Error("Can't flush inside Deps.autorun");

  @inFlush = true
  @willFlush = true


  while (@pending_computations.length > 0 ||
      @after_flush_callbacks.length > 0) do

      #recompute all pending computations
    comps = @pending_computations;
    @pending_computations = [];

    comps.each do |comp|
      comp.recompute();

    #if (afterFlushCallbacks.length) {
    #    // call one afterFlush callback, which may
    #// invalidate more computations
    #var func = afterFlushCallbacks.shift();
    #try {
    #  func();
    #} catch (e) {
    #    _debugFunc()("Exception from Deps afterFlush function:",
    #    e.stack || e.message);
    #}
    end
  end

  inFlush = false;
  willFlush = false;

end

.isolateValue(equals = nil, &f) ⇒ Object 



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# File 'lib/autodeps/autodeps.rb', line 96

def isolateValue(equals=nil, &f)
  raise "must define a block in isolateValue" unless f
  if (!Autodeps.active)
    return f.call();
  end

  result_dep = Autodeps::Dependency.new;
  orig_result = nil
  Autodeps.autorun do |c|
    result = f.call();
    if (c.first_run)
      orig_result = result;
    elsif (!(equals ? equals(result, orig_result) :
        result == orig_result))
      result_dep.changed();
    end
  end
  result_dep.depend();

  return orig_result;
end

.nonreactive(&f) ⇒ Object 



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# File 'lib/autodeps/autodeps.rb', line 34

def nonreactive(&f)
  previous = self.current_computation;
  self.current_computation = nil;
  begin
    f.call()
  ensure
    self.current_computation = previous;
  end
end

.on_invalidate(&f) ⇒ Object 



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# File 'lib/autodeps/autodeps.rb', line 84

def on_invalidate(&f)
  if (! Autodeps.active)
    raise "AutoDeps.on_invalidate requires a currentComputation"
  end

    Autodeps.current_computation.on_invalidate(f);
end