ex9_10.txt

j2ee core design patterns

Example 9.10 	WorkflowCommand, WorkflowProcessCommand and  WorkItemCommand Code

package ActionAdapter;

public interface WorkflowCommand {
  public void execute();
}


package ActionAdapter;

import Core.HireEmployeeConstants;

public class WorkflowProcessCommand 
    implements WorkflowCommand {
  private String userId;
  private CommandData commandData;

  public WorkflowProcessCommand(String userId,
      CommandData commandData) {
    this.userId = userId;
    this.commandData = commandData;
  }

  public void execute() {
    WorkflowCommandData d = (WorkflowCommandData) commandData;
    String workflowName = d.getWorkflowName();
    String workflowProcessId = d.getWorkflowProcessId();
    WorkflowDelegate delegate = new WorkflowDelegate(userId);
    if (d.commandType ==
        HireEmployeeConstants.START_WORKFLOW_TYPE) {
      delegate.start(workflowName);
    } else if (d.commandType == 
        HireEmployeeConstants.STOP_WORKFLOW_TYPE) {
      delegate.stop(workflowProcessId);
    } else if (d.commandType == 
        HireEmployeeConstants.PAUSE_WORKFLOW_TYPE) {
      delegate.pause(workflowProcessId);
    }
  }
}

package ActionAdapter;

import Core.HireEmployeeConstants;

public class WorkItemCommand implements WorkflowCommand {
  private String userId;
  private CommandData commandData;

  public WorkItemCommand(String userId,
      CommandData commandData) {
    this.userId = userId;
    this.commandData = commandData;
  }

  public void execute() {
    WorkItemCommandData d = (WorkItemCommandData) commandData;
    String workItemId = d.getWorkItemId();
    WorkflowDelegate delegate = new WorkflowDelegate(userId);
    if (d.commandType == 
        HireEmployeeConstants.ACQUIRE_WORKITEM_TYPE) {
      delegate.acquireWorkItem(workItemId);
    } else if (d.commandType == 
        HireEmployeeConstants.COMMIT_WORKITEM_TYPE) {
      delegate.commitWorkItem(workItemId);
    } else if (d.commandType == 
        HireEmployeeConstants.ABORT_WORKITEM_TYPE) {
      delegate.abortWorkItem(workItemId);
    }
  }
}