edu.indiana.d2i.sloan.internal.StopVMSimulator.java Source code

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/*******************************************************************************
 * Copyright 2014 The Trustees of Indiana University
 * 
 * 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 edu.indiana.d2i.sloan.internal;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.Option;
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.commons.lang.StringUtils;
import org.apache.log4j.Logger;

import edu.indiana.d2i.sloan.vm.VMState;

public class StopVMSimulator extends HypervisorCmdSimulator {
    private static Logger logger = Logger.getLogger(StopVMSimulator.class);

    public StopVMSimulator() {
        initOptions();
    }

    @Override
    protected void initOptions() {
        options = new Options();

        Option wdir = OptionBuilder.withArgName("workingdir").isRequired().hasArg()
                .withDescription("working directory").create(CMD_FLAG_VALUE.get(CMD_FLAG_KEY.WORKING_DIR));

        options.addOption(wdir);
    }

    public static void main(String[] args) {
        StopVMSimulator simulator = new StopVMSimulator();

        CommandLineParser parser = new PosixParser();

        try {
            CommandLine line = simulator.parseCommandLine(parser, args);
            String wdir = line.getOptionValue(CMD_FLAG_VALUE.get(CMD_FLAG_KEY.WORKING_DIR));

            if (!HypervisorCmdSimulator.resourceExist(wdir)) {
                logger.error(String.format("Cannot find VM working dir: %s", wdir));
                System.exit(ERROR_CODE.get(ERROR_STATE.VM_NOT_EXIST));
            }

            Properties prop = new Properties();
            String filename = HypervisorCmdSimulator.cleanPath(wdir) + HypervisorCmdSimulator.VM_INFO_FILE_NAME;

            prop.load(new FileInputStream(new File(filename)));

            // cannot stop VM when it is not running
            VMState currentState = VMState.valueOf(prop.getProperty(CMD_FLAG_VALUE.get(CMD_FLAG_KEY.VM_STATE)));

            if (!currentState.equals(VMState.RUNNING)) {
                logger.error("Cannot perform stop when VM is not running");
                System.exit(ERROR_CODE.get(ERROR_STATE.VM_NOT_RUNNING));
            }

            // stop VM
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                logger.error(e.getMessage());
            }

            // update VM status file, i.e. set state to shutdown
            prop.put(CMD_FLAG_VALUE.get(CMD_FLAG_KEY.VM_STATE), VMState.SHUTDOWN.toString());

            // save VM state file back
            prop.store(new FileOutputStream(new File(filename)), "");

            // success
            System.exit(0);

        } catch (ParseException e) {
            logger.error(String.format("Cannot parse input arguments: %s%n, expected:%n%s",
                    StringUtils.join(args, " "), simulator.getUsage(100, "", 5, 5, "")));

            System.exit(ERROR_CODE.get(ERROR_STATE.INVALID_INPUT_ARGS));
        } catch (IOException e) {
            logger.error(e.getMessage(), e);
            System.exit(ERROR_CODE.get(ERROR_STATE.IO_ERR));
        }

    }
}