git.basschouten.com Git - openhab-addons.git/blob

   1 /**
   2  * Copyright (c) 2010-2023 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.nuvo.internal.communication;
  14
  15 import java.util.Arrays;
  16
  17 import org.eclipse.jdt.annotation.NonNullByDefault;
  18 import org.openhab.binding.nuvo.internal.NuvoException;
  19 import org.slf4j.Logger;
  20 import org.slf4j.LoggerFactory;
  21
  22 /**
  23  * A class that reads messages from the Nuvo device in a dedicated thread
  24  *
  25  * @author Laurent Garnier - Initial contribution
  26  * @author Michael Lobstein - Adapted for the Nuvo binding
  27  */
  28 @NonNullByDefault
  29 public class NuvoReaderThread extends Thread {
  30
  31     private final Logger logger = LoggerFactory.getLogger(NuvoReaderThread.class);
  32
  33     private static final int READ_BUFFER_SIZE = 16;
  34     private static final int SIZE = 256;
  35
  36     private static final char TERM_CHAR = '\r';
  37
  38     private NuvoConnector connector;
  39
  40     /**
  41      * Constructor
  42      *
  43      * @param connector the object that should handle the received message
  44      * @param uid the thing uid string
  45      * @param connectionId a string that uniquely identifies the particular connection
  46      */
  47     public NuvoReaderThread(NuvoConnector connector, String uid, String connectionId) {
  48         super("OH-binding-" + uid + "-" + connectionId);
  49         this.connector = connector;
  50         setDaemon(true);
  51     }
  52
  53     @Override
  54     public void run() {
  55         logger.debug("Data listener started");
  56
  57         byte[] readDataBuffer = new byte[READ_BUFFER_SIZE];
  58         byte[] dataBuffer = new byte[SIZE];
  59         int index = 0;
  60
  61         try {
  62             while (!Thread.interrupted()) {
  63                 int len = connector.readInput(readDataBuffer);
  64                 if (len > 0) {
  65                     for (int i = 0; i < len; i++) {
  66
  67                         if (index < SIZE) {
  68                             dataBuffer[index++] = readDataBuffer[i];
  69                         }
  70                         if (readDataBuffer[i] == TERM_CHAR) {
  71                             if (index >= SIZE) {
  72                                 dataBuffer[index - 1] = (byte) TERM_CHAR;
  73                             }
  74                             byte[] msg = Arrays.copyOf(dataBuffer, index);
  75                             connector.handleIncomingMessage(msg);
  76                             index = 0;
  77                         }
  78
  79                     }
  80                 }
  81             }
  82         } catch (NuvoException e) {
  83             logger.debug("Reading failed: {}", e.getMessage(), e);
  84             connector.handleIncomingMessage(NuvoConnector.COMMAND_ERROR.getBytes());
  85         }
  86
  87         logger.debug("Data listener stopped");
  88     }
  89 }