PHP Class ezcWorkflowNodeDiscriminator, Workflow

The Discriminator workflow pattern can be applied when the assumption made for the Simple Merge workflow pattern does not hold. It can deal with merge situations where multiple incoming branches may run in parallel. It activates its outgoing node after being activated by the first incoming branch and then waits for all remaining branches to complete before it resets itself. After the reset the Discriminator can be triggered again. Use Case Example: To improve response time, an action is delegated to several distributed servers. The first response proceeds the flow, the other responses are ignored. Incoming nodes: 2..* Outgoing nodes: 1 This example creates a workflow that splits in two parallel threads which are joined again using a ezcWorkflowNodeDiscriminator.


startNode->addOutNode( $split );
$nodeExec1 = ....; // create nodes for the first thread of execution here..
$nodeExec2 = ....; // create nodes for the second thread of execution here..

$disc = new ezcWorkflowNodeDiscriminator();
$disc->addInNode( $nodeExec1 );
$disc->addInNode( $nodeExec2 );
$disc->addOutNode( $workflow->endNode );
?>

Inheritance: extends ezcWorkflowNodeMerge

Show file Open project: zetacomponents/workflow Class Usage Examples

Public Methods

Method	Description
activate ( ezcWorkflowExecution $execution, ezcWorkflowNode $activatedFrom = null, integer $threadId )	Activate this node.
execute ( ezcWorkflowExecution $execution ) : boolean	Executes this node.

Method Details

activate() public method

Activate this node.

public activate ( ezcWorkflowExecution $execution, ezcWorkflowNode $activatedFrom = null, integer $threadId )
$execution	ezcWorkflowExecution
$activatedFrom	ezcWorkflowNode
$threadId	integer

execute() public method

Executes this node.

public execute ( ezcWorkflowExecution $execution ) : boolean
$execution	ezcWorkflowExecution
return	boolean	true when the node finished execution, and false otherwise