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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.kaleidescape.internal.communication;
  14
  15 import java.util.Arrays;
  16
  17 import org.eclipse.jdt.annotation.NonNullByDefault;
  18 import org.openhab.binding.kaleidescape.internal.KaleidescapeException;
  19 import org.slf4j.Logger;
  20 import org.slf4j.LoggerFactory;
  21
  22 /**
  23  * A class that reads messages from the Kaleidescape component in a dedicated thread
  24  *
  25  * @author Laurent Garnier - Initial contribution
  26  * @author Michael Lobstein - Adapted for the Kaleidescape binding
  27  */
  28 @NonNullByDefault
  29 public class KaleidescapeReaderThread extends Thread {
  30     private static final int READ_BUFFER_SIZE = 16;
  31     private static final int SIZE = 512;
  32     private static final char TERM_CHAR = '\r';
  33
  34     private final Logger logger = LoggerFactory.getLogger(KaleidescapeReaderThread.class);
  35
  36     private KaleidescapeConnector connector;
  37
  38     /**
  39      * Constructor
  40      *
  41      * @param connector the object that should handle the received message
  42      * @param uid the thing uid string
  43      * @param connectionId a string that uniquely identifies the particular connection
  44      */
  45     public KaleidescapeReaderThread(KaleidescapeConnector connector, String uid, String connectionId) {
  46         super("OH-binding-" + uid + "-" + connectionId);
  47         this.connector = connector;
  48         setDaemon(true);
  49     }
  50
  51     @Override
  52     public void run() {
  53         logger.debug("Data listener started");
  54
  55         byte[] readDataBuffer = new byte[READ_BUFFER_SIZE];
  56         byte[] dataBuffer = new byte[SIZE];
  57         int index = 0;
  58
  59         try {
  60             while (!Thread.interrupted()) {
  61                 int len = connector.readInput(readDataBuffer);
  62                 if (len > 0) {
  63                     for (int i = 0; i < len; i++) {
  64
  65                         if (index < SIZE) {
  66                             dataBuffer[index++] = readDataBuffer[i];
  67                         }
  68                         if (readDataBuffer[i] == TERM_CHAR) {
  69                             if (index >= SIZE) {
  70                                 dataBuffer[index - 1] = (byte) TERM_CHAR;
  71                             }
  72                             byte[] msg = Arrays.copyOf(dataBuffer, index);
  73                             connector.handleIncomingMessage(msg);
  74                             index = 0;
  75                         }
  76
  77                     }
  78                 }
  79             }
  80         } catch (KaleidescapeException e) {
  81             logger.debug("Reading failed: {}", e.getMessage(), e);
  82         }
  83
  84         logger.debug("Data listener stopped");
  85     }
  86 }