Can I write a Beanshell console with Java?

Question

I use Beanshell as a built-in debugging tool in my application. This means that I can connect to my application and connect to it with my internal components during its launch (usually I end a telnet session with rlwrap).

The problem is that the only way I found to print in the Beanshell console, and not for the application itself, is the print () method in Beanshell.

But I would like to write Java code that I can call from Beanshell, which will be output to the Beanshell console - i.e. it will be shown in my telnet session, and not sent to the stdout of the application, as it happens if you try to use System.out or System.err.

Is it possible?

---

edit: To clarify, I am setting up a Beanshell server as follows:

public static void setUpBeanshell() {
    try {
        i.setShowResults(true);
        i.eval(new InputStreamReader(Bsh.class.getResourceAsStream("init.bsh")));
        i.eval("server(" + Main.globalConfig.beanShellPort + ");");
    } catch (final EvalError e) {
        Main.log.error("Error generated while starting BeanShell server", e);
    }
}

How can I change this so that I can write a Java function that is output to a telnet session (and not to my application's System.out).

Answer 1

I will copy it there, as it seems that comments are not currently taken into account.

you can: instead of having a method that prints debugging information to standard output, returns this debugging information:

class ClientList {
 Integer clients = 0;
 public String debugClientList() {
   return clients.toString();
 }

and then calling it from beanshell

print(clients.debugCientList());

will give you an output on your telnet

or if you need more login, you need to interact directly with the Interpreter object.

InterpreterSingleton {  
    public static final void Console console = new Interpreter();
}
....

class ClientList {
 Integer clients = 0;
 public void addClient(Client c) {
    ....
    InterpreterSingleton.console.print("Client added, clients now are " + clients);
 }

, ; telnet , telnet-. - telnet , , server() ( lgpl sun).

, ; , , :

class InterpreterSingletonList {  
    public static final void Set<Interpreter> is = new HashSet();
    void printToAll(String s) {
         for (Interpreter i: is) {
             i.print(s);
         }
    }
}



package bsh.util;

import java.io.*;

import java.net.Socket;
import java.net.ServerSocket;
import bsh.*;

/**
    BeanShell remote session server.
    Starts instances of bsh for client connections.
    Note: the sessiond effectively maps all connections to the same interpreter
    (shared namespace).
*/
public class Sessiond extends Thread
{
    private ServerSocket ss;
    NameSpace globalNameSpace;

    public Sessiond(NameSpace globalNameSpace, int port) throws IOException
    {
        ss = new ServerSocket(port);
        this.globalNameSpace = globalNameSpace;
    }

    public void run()
    {
        try
        {
            while(true)
                new SessiondConnection(globalNameSpace, ss.accept()).start();
        }
        catch(IOException e) { System.out.println(e); }
    }
}

class SessiondConnection extends Thread
{
    NameSpace globalNameSpace;
    Socket client;

    SessiondConnection(NameSpace globalNameSpace, Socket client)
    {
        this.client = client;
        this.globalNameSpace = globalNameSpace;
    }

    public void run()
    {
        try
        {
            InputStream in = client.getInputStream();
            PrintStream out = new PrintStream(client.getOutputStream());
            /* this is the one you're looking for */
                        Interpreter i = new Interpreter( 
                new InputStreamReader(in), out, out, true, globalNameSpace);
            i.setExitOnEOF( false ); // don't exit interp
                    /*store the interpreter on the list*/
                    InterpreterSingletonList.is.add(i);
            i.run();
                    /*remove it (i.run() blocks)*/
                    InterpreterSingletonList.is.remove(i);
        }
        catch(IOException e) { System.out.println(e); }
    }
}

Answer 2

, - ..., , BSH telnet-.

, , bsh.util.Sessiond. telnet-. , , bsh.Interpreter ( ) .

, , telnet, System.out System.err .

, : System.out System.err , reset .

, bsh.util.Sessiond - mybsh.util.DebuggerSessiond, SessiondConnection bsh/commands/server.bsh, "" telnet- ( ). ( , script ...)

: beanshell

Answer 3

- , appender/handler, , , beanshell ? beanshell.

( beanshell, !)