Examples of edu.neu.ccs.task.Plan

edu.neu.ccs.task.Plan
A Plan represents an intention to do something, in order to accomplish a particular task. "Something" may be doing a task itself, applying a particular decomposition to a task, or trying to fulfill a step of a decomposition; each of these cases are represented by concrete subclasses of Plan.
Most plans are in service of some larger plan, which is called the parent. A plan with no parent is referred to as a "top-level" plan. A plan together with its parents and children form a data structure called a plan tree, which represents all the past and future intentions to accomplish some top-level goal.
A plan may be in several different states which specify whether or not the goal is, was, or may in the future be achieved:

startable

this plan could be begun now (whether or now it has been begun)

started

the agent has begun trying to carry out this plan (and may or may not have finished)

done

the plan has been successfully carried out

failed

the plan has not been succesfully achieved, and the agent has given up trying

live

the plan can be worked on; it has been or could be started, and has not failed or succeeded

A note on "failed" -- in this framework, failure is expected to be permanent; the agent has given up on carrying out this particular plan. Phenomena like retrying a failed task (possibly with a different decomposition) are handled by adding a new sub-plan to the parent plan.
An elaboration is a possible addition to a plan tree; that is, an intention that an agent is considering but has not yet decided to adopt or reject. Elaborations are also represented by the Plan class and its subclasses; an elaboration references its parent plan but does not appear in the parent's list of children (see {@link #isElaboration()} and {@link #attach()}). Note that an elaboration is not necessary just a single Plan object; it may consist of an entire subtree. @author Dan Schulman @version $Id: Plan.java 458 2009-06-05 20:08:52Z schulman $

        return;
      }
    }
    
    String exitUrl = null;
    Plan top = agent.getTop();
    Task topTask = top.getThisTask();
    Slot exitUrlSlot = topTask.getType().getSlotIfExists("exitUrl");
    if ((exitUrlSlot != null) &&
      exitUrlSlot.isOutput() &&
      "string".equals(exitUrlSlot.getType()) &&
      topTask.isDefinedSlot("exitUrl")) {

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    dump("USER", agent.getEngine().dumpUserModel());
  }
  
  private void dumpPlan() {
    StringWriter sw = new StringWriter();
    Plan plan = agent.getTop();
    if (plan != null)
      plan.printTree(new PrintWriter(sw), true, new Decorator() {
        public String decorate(Object o) {
          return (o == agent.getFocus()) ? " <-focus" : "";
        }
      });

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  @Desc("display the current plan tree")
  @Help("Usage: status\n" +
      "Display a text representation of the current plan tree.\n" +
      "If 'verbose' is enabled, this will contain more detail.")
  public void _status(String ignored) {
    Plan top = agent.getTop();
    if (top == null)
      out.println("No current task");
    else
      top.printTree(out, verbose, new Decorator() {
        public String decorate(Object o) {
          return (o == agent.getFocus()) ? " <-focus" : "";
        }
      });
  }

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    }
    return currentInputWidget;
  }
  
  private boolean getElaboratedLive(final Visitor<Plan> v) {
    Plan plan = focus;
    while (!plan.isLive())
      plan = plan.getParent();
    
    return plan.getBottommostLive(new Visitor<Plan> () {
      public boolean visit(Plan p) {
        return getElaboratedLive(p, v);
      }
    });
  }

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Related Classes of edu.neu.ccs.task.Plan

edu.neu.ccs.task.agent.Agent

edu.neu.ccs.task.agent.AgentConsole

edu.neu.ccs.task.agent.AgentSession

edu.neu.ccs.task.web.DTaskSession

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