Zeta Components - high quality PHP components

The Simple Merge workflow pattern is to be used to merge the possible paths that are defined by a preceding Exclusive Choice. It is assumed that of these possible paths exactly one is taken and no synchronization takes place.

Use Case Example: After the payment has been performed by either credit card or bank transfer, the order can be processed further.

Incoming nodes: 2..* Outgoing nodes: 1

This example displays how you can use a simple merge to tie together two different execution paths from an exclusive choice into one.

1.  <?php
2.  $workflow = new ezcWorkflow( 'Test' );
3.  
4.  // wait for input into the workflow variable value.
5.  $input = new ezcWorkflowNodeInput( array( 'value' => new ezcWorkflowConditionIsInt ) );
6.  $workflow->startNode->addOutNode( $input );
7.  
8.  // create the exclusive choice branching node
9.  $choice = new ezcWorkflowNodeExclusiveChoice;
10.  $intput->addOutNode( $choice );
11.  
12.  $branch1 = ....; // create nodes for the first branch of execution here..
13.  $branch2 = ....; // create nodes for the second branch of execution here..
14.  
15.  // add the outnodes and set the conditions on the exclusive choice
16.  $choice->addConditionalOutNode( new ezcWorkflowConditionVariable( 'value',
17.                                                                   new ezcWorkflowConditionGreatherThan( 10 ) ),
18.                                 $branch1 );
19.  $choice->addConditionalOutNode( new ezcWorkflowConditionVariable( 'value',
20.                                                                   new ezcWorkflowConditionLessThan( 11 ) ),
21.                                 $branch2 );
22.  
23.  // Merge the two branches together and continue execution.
24.  $merge = new ezcWorkflowNodeSimpleMerge();
25.  $merge->addInNode( $branch1 );
26.  $merge->addInNode( $branch2 );
27.  $merge->addOutNode( $workflow->endNode );
28.  ?>