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//---PACKAGE DECLARATION--- |
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|
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//---IMPORTS--- |
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import java.io.ObjectOutputStream; |
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import java.io.IOException; |
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import java.net.Socket; |
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import java.net.UnknownHostException; |
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import java.util.Iterator; |
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import java.util.ArrayList; |
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import java.util.Random; |
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|
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/** |
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* A basic implementation of the Agent abstract class |
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* |
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* @author $Author: ajm4 $ |
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* @version $Id: BasicAgent.java,v 1.2 2001/05/04 02:04:35 ajm4 Exp $ |
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*/ |
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class BasicAgent extends Agent { |
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|
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//---FINAL / FINAL STATIC ATTRIBUTES--- |
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|
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/** |
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* The current CVS revision of this class |
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*/ |
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public static final String REVISION = "$Revision: 1.2 $"; |
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|
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//---STATIC METHODS--- |
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|
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/** |
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* A bootstrap mechanism for an agent. |
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* Essentially used to fire an agent direct into an agent station. |
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* |
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* @param args command line arguements |
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* |
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* @throws UnknownHostException if it can't find the agent station |
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* @throws IOException if there is a problem firing the agent |
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*/ |
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public static void main(String[] args) throws IOException, UnknownHostException { |
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System.out.println("Agent Bootstrapping Started."); |
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if (args.length != 3) { |
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throw new RuntimeException("Must specify an agent name and agent station hostname and port number on the command line!"); |
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} |
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Agent instance = new BasicAgent(args[0]); |
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Socket s = new Socket(args[1], Integer.parseInt(args[2])); |
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ObjectOutputStream p = new ObjectOutputStream(s.getOutputStream()); |
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p.writeObject(instance); |
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p.flush(); |
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s.close(); |
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System.out.println("Agent " + args[0] + " injected into " + args[1] + ":" + args[2]); |
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} |
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|
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//---CONSTRUCTORS--- |
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|
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public BasicAgent(String name) { |
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_name = name; |
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} |
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|
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//---PUBLIC METHODS--- |
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|
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// *** AGENT LIFETIME *** |
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|
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public void run() { |
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while(_running) { |
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try { |
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Thread.sleep(10000); |
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} catch (InterruptedException e) { |
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} |
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ArrayList agents = _station.getAllAgents(); |
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Iterator i = agents.iterator(); |
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while(i.hasNext()) { |
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Agent agent = (Agent) i.next(); |
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if (agent != (Agent) this) { |
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say("Saying hi to " + agent.getName()); |
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agent.greet(this); |
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} |
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} |
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say("Requesting to move on..."); |
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ArrayList peers = _station.getAllPeers(); |
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if (peers.size() > 1) { |
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PeerHandler dstPeer = (PeerHandler) peers.get(new Random().nextInt(peers.size() - 1)); |
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_station.sendAgent(this, dstPeer); |
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} else if (peers.size() == 1) { |
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PeerHandler dstPeer = (PeerHandler) peers.get(0); |
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_station.sendAgent(this, dstPeer); |
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} |
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} |
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} |
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|
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//*** AGENT SERVICES *** |
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|
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public void onArrival(Station station) { |
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_transmissionCount++; |
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_station = station; |
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_running = true; |
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say("Just arrived at - " + _station.getName()); |
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} |
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|
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public void greet(Agent agent) { |
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say(agent.getName() + " just said hi to me"); |
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} |
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|
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private void say(String text) { |
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System.out.println("*** [" + getName() + "] " + text); |
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} |
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|
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public String getName() { |
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return _name; |
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} |
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|
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public long getTransmissionCount() { |
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return _transmissionCount; |
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} |
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|
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/** |
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* Used to shutdown this thread |
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*/ |
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public void shutdown() { |
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say("shutting down"); |
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_station = null; |
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_running = false; |
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} |
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|
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//*** OTHER PUBLIC METHODS *** |
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|
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//---PRIVATE/PROTECTED METHODS--- |
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|
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/** |
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* Overridden for debugging purposes |
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* to see when an instance of this class |
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* is destroyed |
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*/ |
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protected void finalize() throws Throwable { |
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say("dead - just been gc'd"); |
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} |
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|
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//---ACCESSOR/MUTATOR METHODS--- |
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|
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//---ATTRIBUTES--- |
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|
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/** |
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* The name of the agent |
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*/ |
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private String _name; |
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|
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/** |
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* A reference to the current AgentStation this agent is at |
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*/ |
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private Station _station; |
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|
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/** |
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* A "running" used by the main loop in the run() method to determine if |
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* it should continue running this thread. |
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*/ |
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private boolean _running = true; |
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|
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/** |
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* The number of times this agent has been transmitted between stations |
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*/ |
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private long _transmissionCount = 0; |
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|
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//---STATIC ATTRIBUTES--- |
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|
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} |
