jmxsh.CloseCmd.java Source code

Introduction

Here is the source code for jmxsh.CloseCmd.java

Source

/*
 * $URL$
 * 
 * $Revision$ 
 * 
 * $LastChangedDate$
 *
 * $LastChangedBy$
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */
package jmxsh;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.OptionBuilder;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.apache.commons.cli.PosixParser;
import org.apache.log4j.Logger;

import tcl.lang.Command;
import tcl.lang.Interp;
import tcl.lang.TCL;
import tcl.lang.TclException;
import tcl.lang.TclObject;
import tcl.lang.TclString;

/**
 * Tcl command for closing a JMX connection.
 *  
 * @author robspassky
 */

class CloseCmd implements Command {

    final static CloseCmd instance = new CloseCmd();

    /** Initializes private variables.  Setup the command-line options. */
    private CloseCmd() {
        this.opts = new Options();

        this.opts.addOption(OptionBuilder.withLongOpt("server").withDescription("Server containing mbean.")
                .withArgName("SERVER").hasArg().create("s"));

        this.opts.addOption(
                OptionBuilder.withLongOpt("help").withDescription("Display usage help.").hasArg(false).create("?"));
    }

    private CommandLine parseCommandLine(TclObject argv[]) throws ParseException {

        String[] args = new String[argv.length - 1];

        for (int i = 0; i < argv.length - 1; i++)
            args[i] = argv[i + 1].toString();

        CommandLine cl = (new PosixParser()).parse(this.opts, args);
        return cl;
    }

    private void getDefaults(Interp interp) {
        this.server = null;

        try {
            this.server = interp.getVar("SERVER", TCL.GLOBAL_ONLY).toString();
        } catch (TclException e) {
            /* If one doesn't exist, it will just be null. */
        }

    }

    public void cmdProc(Interp interp, TclObject argv[]) throws TclException {

        try {
            CommandLine cl = parseCommandLine(argv);

            if (cl.hasOption("help")) {
                new HelpFormatter().printHelp("jmx_close [-?] [-s server]",
                        "======================================================================", this.opts,
                        "======================================================================", false);

                System.out.println("jmx_close closes a connection with a JMX server.");
                return;
            }

            getDefaults(interp);

            String serverToClose = cl.getOptionValue("server", this.server);

            if (serverToClose == null) {
                throw new TclException(interp, "No server specified; please set SERVER variable or use -s option.",
                        TCL.ERROR);
            }

            Jmx.getInstance().close(serverToClose);

            if (serverToClose.equals(this.server)) {
                // We need this to avoid getting a "cannot unset non-existent variable"
                // error, which I could not find a way to suppress nicely.
                TclObject space = TclString.newInstance(" ");
                interp.setVar("SERVER", space, TCL.GLOBAL_ONLY);
                interp.setVar("DOMAIN", space, TCL.GLOBAL_ONLY);
                interp.setVar("MBEAN", space, TCL.GLOBAL_ONLY);
                interp.setVar("ATTROP", space, TCL.GLOBAL_ONLY);
                interp.unsetVar("SERVER", TCL.GLOBAL_ONLY);
                interp.unsetVar("DOMAIN", TCL.GLOBAL_ONLY);
                interp.unsetVar("MBEAN", TCL.GLOBAL_ONLY);
                interp.unsetVar("ATTROP", TCL.GLOBAL_ONLY);
                BrowseMode.instance.setServerMenuLevel();
            }

        } catch (ParseException e) {
            throw new TclException(interp, e.getMessage(), 1);
        } catch (RuntimeException e) {
            logger.error("Runtime Exception", e);
            throw new TclException(interp, "Runtime exception.", 1);
        }
    }

    private static Logger logger = Logger.getLogger(CloseCmd.class);

    private String server;
    private Options opts;

}