edu.usc.pgroup.floe.client.commands.KillApp.java Source code

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Here is the source code for edu.usc.pgroup.floe.client.commands.KillApp.java

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/*
 * Copyright 2014 University of Southern California
 *
 * 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.usc.pgroup.floe.client.commands;

import edu.usc.pgroup.floe.client.FloeClient;
import org.apache.commons.cli.BasicParser;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.HelpFormatter;
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.thrift.TException;
import org.slf4j.LoggerFactory;

/**
 * @author kumbhare
 */
public final class KillApp {

    /**
     * Hiding the default constructor.
     */
    private KillApp() {

    }

    /**
     * the global logger instance.
     */
    private static final org.slf4j.Logger LOGGER = LoggerFactory.getLogger(KillApp.class);

    /**
     * Entry point for Scale command.
     * @param args command line arguments sent by the floe.py script.
     */
    public static void main(final String[] args) {

        Options options = new Options();

        Option appOption = OptionBuilder.withArgName("name").hasArg().isRequired()
                .withDescription("Application Name").create("app");

        options.addOption(appOption);

        CommandLineParser parser = new BasicParser();
        CommandLine line;

        try {
            line = parser.parse(options, args);

        } catch (ParseException e) {
            LOGGER.error("Invalid command: " + e.getMessage());
            HelpFormatter formatter = new HelpFormatter();
            formatter.printHelp("scale options", options);
            return;
        }

        String app = line.getOptionValue("app");

        LOGGER.info("Application: {}", app);

        try {
            FloeClient.getInstance().killApp(app);
        } catch (TException e) {
            LOGGER.error("Error while connecting to the coordinator: {}", e);
        }
    }
}