Meter.java

/**
 * Copyright (c) 2010-2016 by the respective copyright holders.
 *
 * 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
 */
package org.openhab.binding.iec6205621meter.internal;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeoutException;

import org.openmuc.j62056.Connection;
import org.openmuc.j62056.DataSet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This class represents a serial named meter with its communication configuration.
 * 
 * @author Peter Kreutzer
 * @author Günter Speckhofer
 * @since 1.5.0
 */
public class Meter {

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

    private final MeterConfig config;

    private final String name;

    public Meter(String name, MeterConfig config) {
        this.name = name;
        this.config = config;
    }

    /**
     * Return the name of meter
     * 
     * @return the name of meter
     */
    public String getName() {
        return name;
    }

    /**
     * Return the configuration of this meter
     * 
     * @return the meter configuration
     */
    public MeterConfig getConfig() {
        return config;
    }

    /**
     * Reads data from meter
     * 
     * @return a map of DataSet objects with the obis as key.
     */
    public Map<String, DataSet> read() {
        // the frequently executed code (polling) goes here ...
        Map<String, DataSet> dataSetMap = new HashMap<String, DataSet>();

        Connection connection = new Connection(config.getSerialPort(), config.getInitMessage(),
                config.getEchoHandling(), config.getBaudRateChangeDelay());
        try {
            try {
                connection.open();
            } catch (IOException e) {
                logger.error("Failed to open serial port {}: {}", config.getSerialPort(), e.getMessage());
                return dataSetMap;
            }

            List<DataSet> dataSets = null;
            try {
                dataSets = connection.read();
                for (DataSet dataSet : dataSets) {
                    logger.debug("DataSet: {};{};{}", dataSet.getId(), dataSet.getValue(), dataSet.getUnit());
                    dataSetMap.put(dataSet.getId(), dataSet);
                }
            } catch (IOException e) {
                logger.error("IOException while trying to read: {}", e.getMessage());
            } catch (TimeoutException e) {
                logger.error("Read attempt timed out");
            }
        } finally {
            connection.close();
        }

        return dataSetMap;
    }
}