Reactor.js
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	/**
	* @provides javelin-reactor
	* @requires javelin-install
	* javelin-util
	* @javelin
	*/

	JX.install('Reactor', {
	statics : {
	/**
	* Return this value from a ReactorNode transformer to indicate that
	* its listeners should not be activated.
	*/
	DoNotPropagate : {},
	/**
	* For internal use by the Reactor system.
	*/
	propagatePulse : function(start_pulse, start_node) {
	var reverse_post_order =
	JX.Reactor._postOrder(start_node).reverse();
	start_node.primeValue(start_pulse);

	for (var ix = 0; ix < reverse_post_order.length; ix++) {
	var node = reverse_post_order[ix];
	var pulse = node.getNextPulse();
	if (pulse === JX.Reactor.DoNotPropagate) {
	continue;
	}

	var next_pulse = node.getTransformer()(pulse);
	var sends_to = node.getListeners();
	for (var jx = 0; jx < sends_to.length; jx++) {
	sends_to[jx].primeValue(next_pulse);
	}
	}
	},
	/**
	* For internal use by the Reactor system.
	*/
	_postOrder : function(node, result, pending) {
	if (typeof result === "undefined") {
	result = [];
	pending = {};
	}
	pending[node.getGraphID()] = true;

	var nexts = node.getListeners();
	for (var ix = 0; ix < nexts.length; ix++) {
	var next = nexts[ix];
	if (pending[next.getGraphID()]) {
	continue;
	}
	JX.Reactor._postOrder(next, result, pending);
	}

	result.push(node);
	return result;
	},

	// Helper for lift.
	_valueNow : function(fn, dynvals) {
	var values = [];
	for (var ix = 0; ix < dynvals.length; ix++) {
	values.push(dynvals[ix].getValueNow());
	}
	return fn.apply(null, values);
	},

	/**
	* Lift a function over normal values to be a function over dynvals.
	* @param fn A function expecting normal values
	* @param dynvals Array of DynVals whose instaneous values will be passed
	* to fn.
	* @return A DynVal representing the changing value of fn applies to dynvals
	* over time.
	*/
	lift : function(fn, dynvals) {
	var valueNow = JX.bind(null, JX.Reactor._valueNow, fn, dynvals);

	var streams = [];
	for (var ix = 0; ix < dynvals.length; ix++) {
	streams.push(dynvals[ix].getChanges());
	}

	var result = new JX['ReactorNode'](streams, valueNow);
	return new JX['DynVal'](result, valueNow());
	}
	}
	});

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