/[i-scream]/experimental/agents/DirectAgentHandler.java
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Contents of /experimental/agents/DirectAgentHandler.java

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Revision 1.1 - (show annotations)
Fri May 4 02:04:35 2001 UTC (17 years, 10 months ago) by ajm
Branch: MAIN
CVS Tags: HEAD
Loads of new framework but far from complete.

The BasicAgent class is as it says, a basic agent, with ability to be run from the command line to fire it into an agentstation.

AgentStations now have support for adding and removing agents and support for multiple listeners.  Also initial support for peer agent stations.  Attempted support at peer -> peer agent transfer, but run into problems.

Still no bytecode transfer, but location and method has been figured out.

The AgentSystem class is now the bootstrap class for an agent station.  It brings up the AgentStation (which is now singleton) and the Logger (also singleton - using standard i-scream logging techniques).  It is possible to specify a peer station that the booting agent station should connect to.

Initial TODO:

	agent class loader
	agent bytecode transfer
	solve peer -> peer problems - possibly by creating extra socket to send agent, but shouldn't really be needed

1 //---PACKAGE DECLARATION---
2
3 //---IMPORTS---
4 import java.io.ObjectInputStream;
5 import java.io.IOException;
6 import java.net.Socket;
7
8 /**
9 * Handles agents that connect directly to the agent station
10 * as opposed to agents from peers stations.
11 *
12 * @author $Author: tdb1 $
13 * @version $Id: TemplateClass.java,v 1.11 2001/03/22 21:50:41 tdb1 Exp $
14 */
15 class DirectAgentHandler extends Handler {
16
17 //---FINAL / FINAL STATIC ATTRIBUTES---
18
19 /**
20 * The current CVS revision of this class
21 */
22 public static final String REVISION = "$Revision: 1.11 $";
23
24 //---STATIC METHODS---
25
26 //---CONSTRUCTORS---
27
28 public DirectAgentHandler(Socket socket) throws IOException {
29 super(socket);
30 _logger.write(toString(), Logger.SYSINIT, "created");
31 }
32
33 //---PUBLIC METHODS---
34
35 public void run() {
36 _logger.write(toString(), Logger.SYSINIT, "started");
37 try {
38 // receive agent bytecode
39
40 // TODO
41
42 // receive agent state (serialized object)
43 ObjectInputStream objectStream = new ObjectInputStream(_socket.getInputStream());
44 Agent agent = (Agent) objectStream.readObject();
45 AgentStation.getInstance().addAgent(agent);
46
47 _logger.write(toString(), Logger.DEBUG, "Agent state received");
48 _logger.write(toString(), Logger.SYSMSG, "Agent name - " + agent.getName());
49 _logger.write(toString(), Logger.DEBUG, agent.getName() + "'s transmission count - " + agent.getTransmissionCount());
50
51 _logger.write(toString(), Logger.SYSMSG, "Welcoming agent");
52 agent.onArrival(AgentStation.getInstance());
53
54 _logger.write(toString(), Logger.SYSMSG, "Starting agent thread");
55
56 Thread thread = new Thread(agent);
57 thread.start();
58
59 objectStream.close();
60
61 } catch (IOException e) {
62 _logger.write(toString(), Logger.ERROR, "I/O ERROR - " + e);
63 } catch (ClassNotFoundException e) {
64 _logger.write(toString(), Logger.ERROR, "ERROR - possible error transferring agent bytecode - " + e);
65 }
66
67 shutdownSocket();
68 _logger.write(toString(), Logger.SYSINIT, "finished");
69 }
70
71 /**
72 * Overrides the {@link java.lang.Object#toString() Object.toString()}
73 * method to provide clean logging (every class should have this).
74 *
75 * This uses the uk.ac.ukc.iscream.util.FormatName class
76 * to format the toString()
77 *
78 * @return the name of this class and its CVS revision
79 */
80 public String toString() {
81 return FormatName.getName(
82 _name,
83 getClass().getName(),
84 REVISION);
85 }
86
87 //---PRIVATE/PROTECTED METHODS---
88
89 //---ACCESSOR/MUTATOR METHODS---
90
91 //---ATTRIBUTES---
92
93 /**
94 * This is the friendly identifier of the
95 * component this class is running in.
96 * eg, a Filter may be called "filter1",
97 * If this class does not have an owning
98 * component, a name from the configuration
99 * can be placed here. This name could also
100 * be changed to null for utility classes.
101 */
102 private String _name = "DirectAgentHandler";
103
104 /**
105 * This holds a reference to the
106 * system logger that is being used.
107 */
108 private Logger _logger = Logger.getInstance();
109
110 //---STATIC ATTRIBUTES---
111
112 }

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