Swiz EventChains with conditionals

Chaining with Async Events

[EventHandler(event="DeviceEvent.LOAD_SUMMARY",properties="device,filters,forceLoad")]
/**
 *  Here is an example of Parallel chaining. Developers should not that the workflow() method returns
 *  IAsynchronousOperation to allow workflow() to be itself chained with other eventHandlers.
 *  
 *    - DeviceEvent extends AsynchronousEvent. 
 *    - FunctionChainStep is also available
 *  
 *  Here we get Device Snapshot information (includes upTimes and durationInState)
 */
public function workflow_loadDeviceSummaries(device:DeviceVO=null, filterIDs:Array=null, force:Boolean=false):IAsynchronousOperation
{
	logger.debug( "workflow_loadDeviceSummaries( )" );
	
	device ||= model.selected;

	  if (device == null) return null;
	
	var evTests   : Event   = new DeviceEvent(DeviceEvent.LOAD_TESTS,  	   device, filterIDs);
	var evSnaps   : Event   = new DeviceEvent(DeviceEvent.LOAD_SNAPSHOTS,  device );
	
	var chain     : IChain  = new EventChain(dispatcher, ChainType.PARALLEL);
	
	if ( force || !device.hasTests )                               chain.addStep( new EventChainStep(evTests) );		
        if ( force || !device.hasSeverities || !device.hasSnapshots )  chain.addStep( new EventChainStep(evSnaps) );	

	chain.start();
	
	return new AsynchronousChainOperation(chain);
}

EventChains via createEventChain()

/**
* Here is the same method; but it now uses the static 
* EventChain::createEventChain() to do the dirty work...
* 
*/
[EventHandler(event="DeviceEvent.LOAD_SUMMARY",properties="device,filters,forceLoad")]
public function workflow_loadDeviceSummaries(device:DeviceVO=null, filterIDs:Array=null, force:Boolean=false):IAsynchronousOperation
{
  logger.debug( "workflow_loadDeviceSummaries( )" );

  device ||= model.selected;

    if (device == null) return null;

  var evTests : Event = new DeviceEvent(DeviceEvent.LOAD_TESTS, device, filterIDs);
  var evSnaps : Event = new DeviceEvent(DeviceEvent.LOAD_SNAPSHOTS, device );
  var events  : Array = [ ];

	  if ( force || !device.hasTests )                              events.push( evTests );
	  if ( force || !device.hasSeverities || !device.hasSnapshots ) events.push( evSnaps );

  // Use the static EventChain::createEventChain() to do the dirty work...
 
  var chain : IChain = EventChain.createEventChain(events, dispatcher, ChainType.PARALLEL);

  return new AsynchronousChainOperation( chain.start() );
}

The 2nd version is possible with the latest changes to EventChain; see my Swiz fork @ http://bit.ly/jzf4gh

How is this api chaining when the client cannot chain the api calls? The 'api chaining spec' allows for client to chain api calls within one request and on response by chaining the output from one api call to another.