Denon binding telnet connection fix

bundles/binding/org.openhab.binding.denon/src/main/java/org/openhab/binding/denon/internal/DenonConnector.java

@@ -136,11 +136,21 @@ public DenonConnector(DenonConnectionProperties connection, DenonPropertyUpdated
 	 */
 	public void connect() {
 		if (connection.isTelnet()) {
-			listener = new DenonListener(connection,  new DenonUpdateReceivedCallback() {
+			listener = new DenonListener(connection, new DenonUpdateReceivedCallback() {
 				@Override
 				public void updateReceived(String command) {
 					processUpdate(command);
 				}
+
+				@Override
+				public void listenerConnected() {
+					getInitialState();
+				}
+
+				@Override
+				public void listenerDisconnected() {
+					sendUpdate(DenonProperty.POWER.getCode(), OnOffType.OFF);
+				}
 			});
 			listener.start();
 		}
@@ -550,9 +560,9 @@ private <T> T getDocument(String uri, Class<T> response) {
 
 			return obj;
 		} catch (JAXBException e) {
-			logger.warn("Encoding error in get", e);
+			logger.debug("Encoding error in get", e);
 		} catch (XMLStreamException e) {
-			logger.warn("Communication error in get", e);
+			logger.debug("Communication error in get", e);
 		}
 
 		return null;
@@ -574,7 +584,7 @@ private <T,S> T postDocument(String uri, Class<T> response, S request) {
 
 			return obj;
 		} catch (JAXBException e) {
-			logger.warn("Encoding error in post", e);
+			logger.debug("Encoding error in post", e);
 		}
 
 		return null;

bundles/binding/org.openhab.binding.denon/src/main/java/org/openhab/binding/denon/internal/DenonListener.java

@@ -8,97 +8,128 @@
  */
 package org.openhab.binding.denon.internal;
 
-import java.io.BufferedReader;
 import java.io.IOException;
-import java.io.InputStreamReader;
-import java.net.SocketException;
+import java.io.InputStream;
+import java.io.PrintWriter;
+import java.net.SocketTimeoutException;
 
 import org.apache.commons.lang.StringUtils;
 import org.apache.commons.net.telnet.TelnetClient;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
- * Manage telnet connection to the Denon Receiver 
+ * Manage telnet connection to the Denon Receiver
  * 
  * @author Jeroen Idserda
  * @since 1.7.0
  */
 public class DenonListener extends Thread {
-	
+
 	private static final Logger logger = LoggerFactory.getLogger(DenonListener.class);
-
-	private static final Integer RECONNECT_DELAY = 10000; // 10 seconds
-
+
+	private static final Integer RECONNECT_DELAY = 60000; // 1 minute
+
+	private static final Integer TIMEOUT = 60000; // 1 minute
+
 	private DenonConnectionProperties connection;
-	
+
 	private DenonUpdateReceivedCallback callback;
-
-	private TelnetClient tc; 
-
-	boolean running = true;
-
+
+	private TelnetClient tc;
+
+	private boolean running = true;
+
+	private boolean connected = false;
+
 	public DenonListener(DenonConnectionProperties connection, DenonUpdateReceivedCallback callback) {
 		logger.debug("Denon listener created");
-		this.tc = new TelnetClient();
 		this.connection = connection;
 		this.callback = callback;
+
+		this.tc = createTelnetClient();
 	}
-	
+
 	@Override
 	public void run() {
 		while (running) {
-			 if (!tc.isConnected()) {
-				 connectTelnetClient();
-			 }
-
-			 boolean end_loop = false;
-			 BufferedReader reader = new BufferedReader(new InputStreamReader(tc.getInputStream()));
-
-             do {
-            	 try {
-            		 String line = reader.readLine();
-
-					 if (!StringUtils.isBlank(line)) {
-						 logger.trace("Received from {}: {}", connection.getHost(), line);
-						 callback.updateReceived(line);
-					 }
-            	 } catch (IOException e) {
-            		logger.warn("Error in telnet connection", e);
-            		end_loop = true;
+			if (!connected) {
+				connectTelnetClient();
+			}
+
+			InputStream is = tc.getInputStream();
+			PrintWriter out = new PrintWriter(tc.getOutputStream(), true);
+
+			int readCount = 0;
+			byte[] buffer = new byte[4096];
+
+			do {
+				try {
+					readCount = is.read(buffer);
+					if (readCount > -1) {
+						String line = StringUtils.trim(new String(buffer, 0, readCount));
+						if (!StringUtils.isBlank(line)) {
+							logger.trace("Received from {}: {}", connection.getHost(), line);
+							callback.updateReceived(line);
+						}
+					} else {
+						throw new IOException("Telnet connection disconnected");
+					}
+				} catch (SocketTimeoutException e) {
+					logger.trace("Socket timeout");
+					// Disconnects are not always detected unless you write to the socket.
+					out.print(" ");
+					out.flush();
+				} catch (IOException e) {
+					callback.listenerDisconnected();
+					logger.debug("Error in telnet connection", e);
+					connected = false;
 				}
-             } 
-             while(running && end_loop == false);
+			} while (running && connected);
 		}
 	}
-
+
+	public void shutdown() {
+		this.running = false;
+		disconnect();
+	}
+
 	private void connectTelnetClient() {
+		disconnect();
 		int delay = 0;
+
 		while (!tc.isConnected()) {
 			try {
 				Thread.sleep(delay);
 				logger.debug("Connecting to {}", connection.getHost());
 				tc.connect(connection.getHost(), connection.getTelnetPort());
-			}  catch (SocketException e) {
-				logger.error("Error connecting to {}", connection.getHost(), e);
+				callback.listenerConnected();
+				connected = true;
 			} catch (IOException e) {
-				logger.error("Error connecting to {}", connection.getHost(), e);
+				logger.debug("Cannot connect to {}", connection.getHost(), e);
 			} catch (InterruptedException e) {
-				logger.error("Error connecting to {}", connection.getHost(), e);
+				logger.debug("Interrupted while connecting to {}", connection.getHost(), e);
 			}
 			delay = RECONNECT_DELAY;
 		}
 
 		logger.debug("Denon telnet client connected to {}", connection.getHost());
 	}
 
-	public void shutdown(){
-		this.running = false;
-
-		try {
-			this.tc.disconnect();
-		} catch (IOException e) {
-			logger.debug("Error while disconnecting telnet client", e);
+	private void disconnect() {
+		if (tc != null) {
+			try {
+				this.tc.disconnect();
+			} catch (IOException e) {
+				logger.debug("Error while disconnecting telnet client", e);
+			}
 		}
 	}
+
+	private TelnetClient createTelnetClient() {
+		TelnetClient tc = new TelnetClient();
+		tc.setDefaultTimeout(TIMEOUT);
+		return tc;
+	}
+
 }

bundles/binding/org.openhab.binding.denon/src/main/java/org/openhab/binding/denon/internal/DenonUpdateReceivedCallback.java

@@ -17,10 +17,20 @@
 public interface DenonUpdateReceivedCallback {
 
 	/**
-	 * Update was received. 
+	 * Update was received.
 	 * 
-	 * @param command The line of text that was received from the telnet connection
+	 * @param command
+	 *            The line of text that was received from the telnet connection
 	 */
 	public void updateReceived(String command);
 
+	/**
+	 * The listener has successfully connected to the receiver.
+	 */
+	public void listenerConnected();
+
+	/**
+	 * The listener has lost connection to the receiver.
+	 */
+	public void listenerDisconnected();
 }