1. (4 points) One model of mobile agents defines the following methods:

• dispatch(URL) - sends the executing agent to the location specified by the URL.
• run() - a method that is called whenever the agent is created or begins executing at a new location

     class MyAgent
   { private state-variables;

     public void run()
     { //do some computation at the current site
       //decide on next location to visit
       dispatch(nextLocation);
     }
   }

In this model is that the dispatch method does not return. That is, you cannot structure the run method in the following way:

       public void run()
      {  //do first part of the computation at the current site
         //decide on next location to visit
         dispatch(nextLocation);
         //do second part of the computation at the next site
      }

because the second part of the computation would never be executed.

The question: why are the dispatch and run methods defined as they are in this model. Hint: consider what would have to be done to allow the dispatch method to return at its new location.

2. (6 points)  In one mobile agent system, agents are guaranteed to receive messages sent to them regardless of the agent's movements. For example, suppose that agent A is initially located at site X but moves from site X to site Y and then to size Z while a message M is being sent to agent A at site X. The system guarantees that M will be received by A. Propose and evaluate two different ways in which the message handling can be implemented to guarantee the delivery of messages. Evaluate each proposal in terms of overhead, reliability, and message delay.