Examples of de.tuclausthal.informatik.winf.mobileagents.messaging.Message

Package de.tuclausthal.informatik.winf.mobileagents.messaging

Examples of de.tuclausthal.informatik.winf.mobileagents.messaging.Message

de.tuclausthal.informatik.winf.mobileagents.messaging.Message

A message represents a little message agents can send and receive. A message has a sender and one or more recipients. The body of a message is a String which may be verified by concrete implementations for validity to the standard of the plattform. This standard will not be defined in this framework, but it's up to the application. Standards could be free-form text, Agent Control Message etc. A specific message type gets registered in the execution environment which clones the given message and uses it for message passing in the system.

A recipient and sender of a message may be an Agent, a computer or some kind of service in the p2p-network.
@author dluebke @version 1.0.4 (2003-09-19) @see java.lang.Cloneable @since 1.0

      BasicAgentInfo recipient = (BasicAgentInfo)this.agentInfos.get(m.getRecipient());
      
      // no local address
      if(recipient == null)
      {
        Message m2 = MessagingManager.getInstance().createMessage();
        m2.setSender("local:"+HOST_ADDRESS);
        m2.setRecipient(m.getSender());
        m2.setBody("MESSAGESERVICE\nFAILED\n"+m.getMessageID()+"\nRECIPIENT UNKNOWN");
        m2.setRequiresReceipt(false);
        this.sendMessage(m2);
        return;      
      }
      try
      {
        recipient.getMessageList().addMessage(m);
      }
      catch (MessageListFullException e)
      {
        // could not append to message-list
        Message m2 = MessagingManager.getInstance().createMessage();
        m2.setSender("local:"+HOST_ADDRESS);
        m2.setRecipient(m.getSender());
        m2.setBody("MESSAGESERVICE\nFAILED\n"+m.getMessageID()+"\nMESSAGELIST FULL");
        m2.setRequiresReceipt(false);
      }
    } 
    
    if(m.getRequiresReceipt())
    {
      Message receipt = MessagingManager.getInstance().createMessage();
      receipt.setSender("local:"+HOST_ADDRESS);
      receipt.setRecipient(m.getSender());
      receipt.setBody("MESSAGESERVICE\nSENT\n"+m.getMessageID());
      receipt.setRequiresReceipt(false);
      
      // no security check here:
      // we're host, so we may do everything
      this.sendMessage(receipt);
    }

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  {
    while(!this.shouldAgentStop())
    {
      // wait for a message
      // method clears message so we don't need to delete it
      Message m = agentServices.waitForNextMessage();


      // m can be null, e.g. if we should quit
      if(m == null) continue;


      if(m.getBody().equals("EXIT"))
      {
        return;
      } else
      {
        // create a new message, agentService works as a factory for us
        Message echo = agentServices.createMessage();


        // set the recipient and the body
        echo.setRecipient(m.getRecipient());
        echo.setBody(m.getBody());


        // we do not want a receipt
        echo.setRequiresReceipt(false);


        // send message
        agentServices.sendMessage(echo);
      }
    }

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   * @return former first message of this <code>MessageList</code>
   * @see de.tuclausthal.informatik.winf.mobileagents.messaging.MessageList#popFirstMessage
   */
  public Message popFirstMessage()
  {
    Message retval = this.getFirstMessage();
    this.removeMessage(retval);
    return retval;
  }

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      public void start(AgentServices as)
      {
        System.out.println(new Date().toString());


        Message m = as.createMessage();
        m.setBody("Testnachricht");
        m.setRecipient("local:host");
        m.setRequiresReceipt(true);
        as.sendMessage(m);


        m = as.createMessage();
        m.setRecipient("local:" + this.getName());
        m.setBody("To Me");
        as.sendMessage(m);


        m = as.waitForNextMessage();
        System.out.println(
          "Message received: " + new String(m.getBody()));
        m = as.waitForNextMessage();
        System.out.println(
          "Message received: " + new String(m.getBody()));
      }


    });


    f.pack();

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   * @return former last message of this <code>MessageList</code>
   * @see de.tuclausthal.informatik.winf.mobileagents.messaging.MessageList#popLastMessage
   */
  public Message popLastMessage()
  {
    Message retval = this.getLastMessage();
    this.removeMessage(retval);
    return retval;
  }

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   * @return former i-th message of this <code>MessageList</code>
   * @see de.tuclausthal.informatik.winf.mobileagents.messaging.MessageList#popMessage(int)
   */
  public Message popMessage(int i)
  {
    Message retval = this.getMessage(i);
    this.removeMessage(retval);
    return retval;
  }

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Related Classes of de.tuclausthal.informatik.winf.mobileagents.messaging.Message

de.tuclausthal.informatik.winf.mobileagents.container.impl.BasicContainer

de.tuclausthal.informatik.winf.mobileagents.examples.ContainerLogComponent

de.tuclausthal.informatik.winf.mobileagents.examples.EchoAgent

de.tuclausthal.informatik.winf.mobileagents.messaging.impl.BasicMessageList

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