org.eclipse.scada.da.utils.daemon.ExporterDaemon.java Source code

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Here is the source code for org.eclipse.scada.da.utils.daemon.ExporterDaemon.java

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/*******************************************************************************
 * Copyright (c) 2012, 2013 TH4 SYSTEMS GmbH and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     TH4 SYSTEMS GmbH - initial API and implementation
 *******************************************************************************/
package org.eclipse.scada.da.utils.daemon;

import java.io.File;

import org.apache.commons.daemon.Daemon;
import org.apache.commons.daemon.DaemonContext;
import org.eclipse.scada.da.server.exporter.Controller;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Wrapping the exporter controller into a jakarta daemon
 * 
 * @see Daemon
 * @author Jens Reimann
 */
public class ExporterDaemon implements Daemon {

    private static final Logger logger = LoggerFactory.getLogger(ExporterDaemon.class);

    private Controller controller;

    @Override
    public void destroy() {
        this.controller = null;
    }

    @Override
    public void init(final DaemonContext ctx) throws Exception {
        logger.info("Initializing ExporterDaemon");

        if (ctx.getArguments().length < 1) {
            logger.warn("No arguments passed. No config file available");
            throw new Exception("Invalid arguments: exporter <configfile>");
        }

        final String fileName = ctx.getArguments()[0];
        logger.info("Loading configuration from: {}", fileName);
        final File configFile = new File(fileName);
        if (!configFile.canRead()) {
            throw new Exception(String.format("'%s' is not a file or can not be read", fileName));
        }

        this.controller = new Controller(configFile);
    }

    @Override
    public void start() throws Exception {
        logger.info("Starting ExporterDaemon");
        this.controller.start();
    }

    @Override
    public void stop() throws Exception {
        logger.info("Stopping service");
        this.controller.stop();
    }

}