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   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.monopriceaudio.internal.communication;
  14
  15 import java.util.Arrays;
  16
  17 import org.eclipse.jdt.annotation.NonNullByDefault;
  18 import org.openhab.binding.monopriceaudio.internal.MonopriceAudioException;
  19 import org.slf4j.Logger;
  20 import org.slf4j.LoggerFactory;
  21
  22 /**
  23  * A class that reads messages from the MonopriceAudio device in a dedicated thread
  24  *
  25  * @author Laurent Garnier - Initial contribution
  26  * @author Michael Lobstein - Adapted for the MonopriceAudio binding
  27  */
  28 @NonNullByDefault
  29 public class MonopriceAudioReaderThread extends Thread {
  30     private static final int READ_BUFFER_SIZE = 16;
  31     private static final int SIZE = 64;
  32     private static final char TERM_CHAR = '\r';
  33     private final Logger logger = LoggerFactory.getLogger(MonopriceAudioReaderThread.class);
  34
  35     private MonopriceAudioConnector connector;
  36
  37     /**
  38      * Constructor
  39      *
  40      * @param connector the object that should handle the received message
  41      * @param uid the thing uid string
  42      * @param connectionId a string that uniquely identifies the particular connection
  43      */
  44     public MonopriceAudioReaderThread(MonopriceAudioConnector connector, String uid, String connectionId) {
  45         super("OH-binding-" + uid + "-" + connectionId);
  46         this.connector = connector;
  47         setDaemon(true);
  48     }
  49
  50     @Override
  51     public void run() {
  52         logger.debug("Data listener started");
  53
  54         byte[] readDataBuffer = new byte[READ_BUFFER_SIZE];
  55         byte[] dataBuffer = new byte[SIZE];
  56         int index = 0;
  57
  58         try {
  59             while (!Thread.interrupted()) {
  60                 int len = connector.readInput(readDataBuffer);
  61                 if (len > 0) {
  62                     for (int i = 0; i < len; i++) {
  63
  64                         if (index < SIZE) {
  65                             dataBuffer[index++] = readDataBuffer[i];
  66                         }
  67                         if (readDataBuffer[i] == TERM_CHAR) {
  68                             if (index >= SIZE) {
  69                                 dataBuffer[index - 1] = (byte) TERM_CHAR;
  70                             }
  71                             byte[] msg = Arrays.copyOf(dataBuffer, index);
  72                             connector.handleIncomingMessage(msg);
  73                             index = 0;
  74                         }
  75
  76                     }
  77                 }
  78             }
  79         } catch (MonopriceAudioException e) {
  80             logger.debug("Reading failed: {}", e.getMessage(), e);
  81             connector.handleIncomingMessage(MonopriceAudioConnector.READ_ERROR.getBytes());
  82         }
  83
  84         logger.debug("Data listener stopped");
  85     }
  86 }