assignmenthandler.java

一个java工作流引擎

package org.jbpm.delegation;

/**
 * is called when execution arrives in a {@link org.jbpm.model.definition.State}
 * and must select the actorId that the process is wait for.
 * 
 * <p>Specifying a state in a business process means that further execution depends
 * on some exteral swimlane (external from jbpm system, that it).  The AssignmentHandler must 
 * calculate that swimlane.     
 * </p> 
 */
public interface AssignmentHandler {
	
  /**
   * calculates on which swimlane the process will be waiting when execution arrives in a state.
   * @param assignerContext is the object that allows the Assigner-implementator to communicate with the jBpm process engine.
   * @return the actorId.  Watch it ! returning null causes a NoActorException to be thrown out
   * of the called ExecutionService method ({@link org.jbpm.ExecutionService#startProcessInstance(String,Long,Map,String)}
   * of {@link org.jbpm.ExecutionService#startProcessInstance(String,Long,Map,String)})
   */
  String selectActor( AssignmentContext assignerContext );
}