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   1 /**
   2  * Copyright (c) 2010-2021 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.rotel.internal.communication;
  14
  15 import java.io.InterruptedIOException;
  16 import java.util.Arrays;
  17
  18 import org.eclipse.jdt.annotation.NonNullByDefault;
  19 import org.openhab.binding.rotel.internal.RotelException;
  20 import org.slf4j.Logger;
  21 import org.slf4j.LoggerFactory;
  22
  23 /**
  24  * A class that reads messages from the Rotel device in a dedicated thread
  25  *
  26  * @author Laurent Garnier - Initial contribution
  27  */
  28 @NonNullByDefault
  29 public class RotelReaderThread extends Thread {
  30
  31     private final Logger logger = LoggerFactory.getLogger(RotelReaderThread.class);
  32
  33     private static final int READ_BUFFER_SIZE = 16;
  34
  35     private RotelConnector connector;
  36
  37     /**
  38      * Constructor
  39      *
  40      * @param connector the object that should handle the received message
  41      * @param threadName the name of the thread
  42      */
  43     public RotelReaderThread(RotelConnector connector, String threadName) {
  44         super(threadName);
  45         this.connector = connector;
  46     }
  47
  48     @Override
  49     public void run() {
  50         logger.debug("Data listener started");
  51
  52         RotelProtocol protocol = connector.getProtocol();
  53         final int size = (protocol == RotelProtocol.HEX)
  54                 ? (6 + connector.getModel().getRespNbChars() + connector.getModel().getRespNbFlags())
  55                 : 64;
  56         byte[] readDataBuffer = new byte[READ_BUFFER_SIZE];
  57         byte[] dataBuffer = new byte[size];
  58         boolean startCodeReached = false;
  59         int count = 0;
  60         int index = 0;
  61         final char terminatingChar = (protocol == RotelProtocol.ASCII_V1) ? '!' : '$';
  62
  63         try {
  64             while (!Thread.interrupted()) {
  65                 int len = connector.readInput(readDataBuffer);
  66                 if (len > 0) {
  67                     for (int i = 0; i < len; i++) {
  68                         if (protocol == RotelProtocol.HEX) {
  69                             if (readDataBuffer[i] == RotelConnector.START) {
  70                                 startCodeReached = true;
  71                                 count = 0;
  72                                 index = 0;
  73                             }
  74                             if (startCodeReached) {
  75                                 if (index < size) {
  76                                     dataBuffer[index++] = readDataBuffer[i];
  77                                 }
  78                                 if (index == 2) {
  79                                     count = readDataBuffer[i];
  80                                 } else if ((count > 0) && (index == (count + 3))) {
  81                                     if ((readDataBuffer[i] & 0x000000FF) == 0x000000FD) {
  82                                         count++;
  83                                     } else {
  84                                         byte[] msg = Arrays.copyOf(dataBuffer, index);
  85                                         connector.handleIncomingMessage(msg);
  86                                         startCodeReached = false;
  87                                     }
  88                                 }
  89                             }
  90                         } else {
  91                             if (index < size) {
  92                                 dataBuffer[index++] = readDataBuffer[i];
  93                             }
  94                             if (readDataBuffer[i] == terminatingChar) {
  95                                 if (index >= size) {
  96                                     dataBuffer[index - 1] = (byte) terminatingChar;
  97                                 }
  98                                 byte[] msg = Arrays.copyOf(dataBuffer, index);
  99                                 connector.handleIncomingMessage(msg);
 100                                 index = 0;
 101                             }
 102                         }
 103                     }
 104                 }
 105             }
 106         } catch (InterruptedIOException e) {
 107             Thread.currentThread().interrupt();
 108             logger.debug("Interrupted via InterruptedIOException");
 109         } catch (RotelException e) {
 110             logger.debug("Reading failed: {}", e.getMessage(), e);
 111             connector.handleIncomingMessage(RotelConnector.READ_ERROR);
 112         }
 113
 114         logger.debug("Data listener stopped");
 115     }
 116 }