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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.benqprojector.internal.connector;
  14
  15 import java.io.IOException;
  16 import java.io.InputStream;
  17 import java.io.OutputStream;
  18 import java.net.Socket;
  19
  20 import org.eclipse.jdt.annotation.NonNullByDefault;
  21 import org.eclipse.jdt.annotation.Nullable;
  22 import org.openhab.binding.benqprojector.internal.BenqProjectorException;
  23 import org.slf4j.Logger;
  24 import org.slf4j.LoggerFactory;
  25
  26 /**
  27  * Connector for TCP communication.
  28  *
  29  * @author Michael Lobstein - Initial contribution
  30  */
  31 @NonNullByDefault
  32 public class BenqProjectorTcpConnector implements BenqProjectorConnector {
  33
  34     private final Logger logger = LoggerFactory.getLogger(BenqProjectorTcpConnector.class);
  35     private final String ip;
  36     private final int port;
  37
  38     private @Nullable Socket socket = null;
  39     private @Nullable InputStream in = null;
  40     private @Nullable OutputStream out = null;
  41
  42     public BenqProjectorTcpConnector(String ip, int port) {
  43         this.ip = ip;
  44         this.port = port;
  45     }
  46
  47     @Override
  48     public void connect() throws BenqProjectorException {
  49         logger.debug("Open connection to address'{}:{}'", ip, port);
  50
  51         try {
  52             Socket socket = new Socket(ip, port);
  53             this.socket = socket;
  54             in = socket.getInputStream();
  55             out = socket.getOutputStream();
  56         } catch (IOException e) {
  57             throw new BenqProjectorException(e);
  58         }
  59     }
  60
  61     @Override
  62     public void disconnect() throws BenqProjectorException {
  63         OutputStream out = this.out;
  64
  65         if (out != null) {
  66             logger.debug("Close tcp out stream");
  67             try {
  68                 out.close();
  69             } catch (IOException e) {
  70                 logger.debug("Error occurred when closing tcp out stream: {}", e.getMessage());
  71             }
  72         }
  73
  74         InputStream in = this.in;
  75         if (in != null) {
  76             logger.debug("Close tcp in stream");
  77             try {
  78                 in.close();
  79             } catch (IOException e) {
  80                 logger.debug("Error occurred when closing tcp in stream: {}", e.getMessage());
  81             }
  82         }
  83
  84         Socket socket = this.socket;
  85         if (socket != null) {
  86             logger.debug("Closing socket");
  87             try {
  88                 socket.close();
  89             } catch (IOException e) {
  90                 logger.debug("Error occurred when closing tcp socket: {}", e.getMessage());
  91             }
  92         }
  93
  94         this.socket = null;
  95         this.out = null;
  96         this.in = null;
  97
  98         logger.debug("Closed");
  99     }
 100
 101     @Override
 102     public String sendMessage(String data) throws BenqProjectorException {
 103         InputStream in = this.in;
 104         OutputStream out = this.out;
 105
 106         if (in == null || out == null) {
 107             connect();
 108             in = this.in;
 109             out = this.out;
 110         }
 111
 112         try {
 113             if (in != null) {
 114                 // flush input stream
 115                 if (in.markSupported()) {
 116                     in.reset();
 117                 } else {
 118                     while (in.available() > 0) {
 119                         int availableBytes = in.available();
 120
 121                         if (availableBytes > 0) {
 122                             byte[] tmpData = new byte[availableBytes];
 123                             in.read(tmpData, 0, availableBytes);
 124                         }
 125                     }
 126                 }
 127                 return sendMsgReadResp(data, in, out);
 128             } else {
 129                 return BLANK;
 130             }
 131         } catch (IOException e) {
 132             logger.debug("IO error occurred...reconnect and resend once: {}", e.getMessage());
 133             disconnect();
 134             connect();
 135
 136             try {
 137                 return sendMsgReadResp(data, in, out);
 138             } catch (IOException e1) {
 139                 throw new BenqProjectorException(e);
 140             }
 141         }
 142     }
 143 }