List of usage examples for java.nio.channels DatagramChannel keyFor
public final SelectionKey keyFor(Selector sel)
From source file:org.openhab.binding.keba.handler.KeContactHandler.java
protected ByteBuffer onReadable(DatagramChannel theChannel, int bufferSize) { lock.lock();/* w w w . ja v a2 s .co m*/ try { SelectionKey theSelectionKey = theChannel.keyFor(selector); if (theSelectionKey != null) { synchronized (selector) { try { selector.selectNow(); } catch (IOException e) { logger.error("An exception occurred while selecting: {}", e.getMessage()); } } Iterator<SelectionKey> it = selector.selectedKeys().iterator(); while (it.hasNext()) { SelectionKey selKey = it.next(); it.remove(); if (selKey.isValid() && selKey.isReadable() && selKey == theSelectionKey) { ByteBuffer readBuffer = ByteBuffer.allocate(bufferSize); int numberBytesRead = 0; boolean error = false; if (selKey == datagramChannelKey) { try { numberBytesRead = theChannel.read(readBuffer); } catch (NotYetConnectedException e) { updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "The remote host is not yet connected"); error = true; } catch (PortUnreachableException e) { updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR, "The remote host is probably not a KEBA EV Charging station"); error = true; } catch (IOException e) { updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "An IO exception occurred"); error = true; } } if (numberBytesRead == -1) { error = true; } if (error) { logger.debug("Disconnecting '{}' because of a socket error", getThing().getUID().toString()); try { theChannel.close(); } catch (IOException e) { logger.error("An exception occurred while closing the channel '{}': {}", datagramChannel, e.getMessage()); } onConnectionLost(); } else { readBuffer.flip(); return readBuffer; } } } } return null; } finally { lock.unlock(); } }
From source file:org.openhab.binding.keba.handler.KeContactHandler.java
protected void onWritable(ByteBuffer buffer, DatagramChannel theChannel) { lock.lock();// ww w . j av a 2 s. c o m try { SelectionKey theSelectionKey = theChannel.keyFor(selector); if (theSelectionKey != null) { synchronized (selector) { try { selector.selectNow(); } catch (IOException e) { logger.error("An exception occurred while selecting: {}", e.getMessage()); } } Iterator<SelectionKey> it = selector.selectedKeys().iterator(); while (it.hasNext()) { SelectionKey selKey = it.next(); it.remove(); if (selKey.isValid() && selKey.isWritable() && selKey == theSelectionKey) { boolean error = false; buffer.rewind(); try { logger.debug("Sending '{}' on the channel '{}'->'{}'", new Object[] { new String(buffer.array()), theChannel.getLocalAddress(), theChannel.getRemoteAddress() }); theChannel.write(buffer); } catch (NotYetConnectedException e) { updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "The remote host is not yet connected"); error = true; } catch (ClosedChannelException e) { updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "The connection to the remote host is closed"); error = true; } catch (IOException e) { updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "An IO exception occurred"); error = true; } if (error) { logger.debug("Disconnecting '{}' because of a socket error", getThing().getUID().toString()); try { theChannel.close(); } catch (IOException e) { logger.warn("An exception occurred while closing the channel '{}': {}", datagramChannel, e.getMessage()); } onConnectionLost(); } } } } } finally { lock.unlock(); } }
From source file:org.openhab.binding.keba.handler.KeContactP20Handler.java
protected ByteBuffer onReadable(DatagramChannel theChannel, int bufferSize, InetAddress permittedClientAddress) { lock.lock();//from ww w . j a v a 2 s .c o m try { SelectionKey theSelectionKey = theChannel.keyFor(selector); if (theSelectionKey != null) { synchronized (selector) { try { selector.selectNow(); } catch (IOException e) { logger.error("An exception occurred while selecting: {}", e.getMessage()); } } Iterator<SelectionKey> it = selector.selectedKeys().iterator(); while (it.hasNext()) { SelectionKey selKey = (SelectionKey) it.next(); it.remove(); if (selKey.isValid() && selKey.isReadable() && selKey == theSelectionKey) { ByteBuffer readBuffer = ByteBuffer.allocate(bufferSize); int numberBytesRead = 0; boolean error = false; if (selKey == listenerKey) { try { InetSocketAddress clientAddress = (InetSocketAddress) theChannel .receive(readBuffer); if (clientAddress.getAddress().equals(permittedClientAddress)) { logger.debug("Received {} on the listener port from {}", new String(readBuffer.array()), clientAddress); numberBytesRead = readBuffer.position(); } else { logger.warn( "Received data from '{}' which is not the permitted remote address '{}'", clientAddress, permittedClientAddress); return null; } } catch (Exception e) { logger.error( "An exception occurred while receiving data on the listener port: '{}'", e.getMessage()); error = true; } } else { try { numberBytesRead = theChannel.read(readBuffer); } catch (NotYetConnectedException e) { updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "The remote host is not yet connected"); error = true; } catch (PortUnreachableException e) { updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR, "The remote host is probably not a KEBA EV Charging station"); error = true; } catch (IOException e) { updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "An IO exception occurred"); error = true; } } if (numberBytesRead == -1) { error = true; } if (error) { logger.debug("Disconnecting '{}' because of a socket error", getThing().getUID().toString()); try { theChannel.close(); } catch (IOException e) { logger.error("An exception occurred while closing the channel '{}': {}", datagramChannel, e.getMessage()); } onConnectionLost(); } else { readBuffer.flip(); return readBuffer; } } } } return null; } finally { lock.unlock(); } }
From source file:org.openhab.binding.keba.handler.KeContactP20Handler.java
protected void onWritable(ByteBuffer buffer, DatagramChannel theChannel) { lock.lock();//from ww w . j av a2 s. c om try { SelectionKey theSelectionKey = theChannel.keyFor(selector); if (theSelectionKey != null) { synchronized (selector) { try { selector.selectNow(); } catch (IOException e) { logger.error("An exception occurred while selecting: {}", e.getMessage()); } } Iterator<SelectionKey> it = selector.selectedKeys().iterator(); while (it.hasNext()) { SelectionKey selKey = (SelectionKey) it.next(); it.remove(); if (selKey.isValid() && selKey.isWritable() && selKey == theSelectionKey) { boolean error = false; buffer.rewind(); try { logger.debug("Sending '{}' on the channel '{}'->'{}'", new Object[] { new String(buffer.array()), theChannel.getLocalAddress(), theChannel.getRemoteAddress() }); theChannel.write(buffer); } catch (NotYetConnectedException e) { updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "The remote host is not yet connected"); error = true; } catch (ClosedChannelException e) { updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "The connection to the remote host is closed"); error = true; } catch (IOException e) { updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "An IO exception occurred"); error = true; } if (error) { logger.debug("Disconnecting '{}' because of a socket error", getThing().getUID().toString()); try { theChannel.close(); } catch (IOException e) { logger.warn("An exception occurred while closing the channel '{}': {}", datagramChannel, e.getMessage()); } onConnectionLost(); } } } } } finally { lock.unlock(); } }
From source file:org.openhab.binding.mart.handler.martHandler.java
/** * Reads a buffer from the channel and returns it * A buffer is essentially a block of memory into which you can write data, which * you can then later read again/*from w w w .ja va2 s. co m*/ * * @param theChannel * @param bufferSize * @param permittedClientAddress * @return */ protected ByteBuffer Reader(DatagramChannel theChannel, int bufferSize, InetAddress permittedClientAddress) { // The lock() method locks the Lock instance so that all threads calling lock() are blocked until unlock() is // executed. lock.lock(); try { // retrieves the channel's key representing its registration with the selector SelectionKey theSelectionKey = theChannel.keyFor(selector); if (theSelectionKey != null) { synchronized (selector) { try { // it selects a set of keys whose corresponding channels are ready for I/O operations. selector.selectNow(); } catch (IOException e) { logger.error("An exception occured while selecting: {}", e.getMessage()); } catch (ClosedSelectorException e) { logger.error("An exception occured while selecting: {}", e.getMessage()); } } // to iterate over the this selector's selected key set Iterator<SelectionKey> iterate = selector.selectedKeys().iterator(); // if iterate has more elements while (iterate.hasNext()) { // represents the key representing the channel's registration with the Selector (selector). SelectionKey selectKey = iterate.next(); iterate.remove(); if (selectKey.isValid() && selectKey.isReadable() && selectKey == theSelectionKey) { // allocate a new byte buffer with 1024 bytes capacity ByteBuffer readBuffer = ByteBuffer.allocate(bufferSize); int numOfBytesRead = 0; boolean error = false; // if the current select key is the key representing the listener's channel registration // with the selector, then read the byte buffer or data from the channel if (selectKey == listenerKey) { try { // receive a datagram via this channel // the channel writes data into the the readBuffer InetSocketAddress clientAddress = (InetSocketAddress) theChannel .receive(readBuffer); // if the returned address given by the receive() is == permitted address if (clientAddress.getAddress().equals(permittedClientAddress)) { logger.debug("Received {} on the listener port from {}", new String(readBuffer.array()), clientAddress); // returns the buffer's position to help as check whether the buffer is // full or not numOfBytesRead = readBuffer.position(); } else { logger.warn( "Received data from '{}' which is not the permitted remote address '{}'", clientAddress, permittedClientAddress); // since it is not a permitted remote address return nothing return null; } } catch (Exception e) { logger.error( "An exception occurred while receiving data on the listener port: '{}'", e.getMessage()); error = true; } // if the selectKey != listenerKey } else { try { // reads a datagram from this channel though the selectKey != listenerKey // reads a data from this channel into the readBuffer or // the channel writes data into the the buffer numOfBytesRead = theChannel.read(readBuffer); } catch (NotYetConnectedException e) { updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "The MART adapter is not yet connected"); error = true; } catch (PortUnreachableException e) { updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR, "This is probably not a MART adapter"); error = true; } catch (IOException e) { updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "An IO exception occurred"); error = true; } } // if numOfBytesRead == -1 then the channel has reached end of stream if (numOfBytesRead == -1) { error = true; } // if error == true , close the channel and re-establish connection if (error) { logger.debug("Disconnecting '{}' because of a socket error", getThing().getUID().toString()); try { // close the channel theChannel.close(); } catch (IOException e) { logger.error("An exception occurred while closing the channel '{}': {}", datagramChannel, e.getMessage()); } // re-establish connection onConnectionLost(); // if error == false, } else { // switch the buffer from writing mode into reading mode and return it readBuffer.flip(); return readBuffer; } } } } return null; } finally { lock.unlock(); } }
From source file:org.openhab.binding.mart.handler.martHandler.java
/** * this function reads from a buffer and writes into a channel * A buffer is essentially a block of memory into which you can write data, which * you can then later read again/*www . j a v a 2 s .c om*/ * * @param buffer * @param theChannel */ protected void writer(ByteBuffer buffer, DatagramChannel theChannel) { lock.lock(); try { // represents the key representing the channel's registration with the Selector (selector). SelectionKey theSelectionKey = theChannel.keyFor(selector); // check if the key isn't null if (theSelectionKey != null) { synchronized (selector) { try { // selects a set of keys whose corresponding channels are ready // for I/O operations selector.selectNow(); } catch (IOException e) { logger.error("An exception occured while selecting {}", e.getMessage()); } } // returns this selector's selected-key set Iterator<SelectionKey> iterate = selector.selectedKeys().iterator(); while (iterate.hasNext()) { SelectionKey selectKey = iterate.next(); iterate.remove(); // checks if the key is valid // tests whether this channels is ready for writing // checks whether the current select key is equal to the channel's registered key // with the selector if (selectKey.isValid() && selectKey.isWritable() && selectKey == theSelectionKey) { boolean error = false; // sets the position back to 0, so you can reread all the data in the buffer buffer.rewind(); try { logger.debug("Sending '{}' in the channel '{}'->'{}'", new Object[] { new String(buffer.array()), theChannel.getLocalAddress(), theChannel.getRemoteAddress() }); // www.businessdictionary.com/definition/datagram.html // writes a datagram to this channel theChannel.write(buffer); } catch (NotYetConnectedException e) { updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "The remote host is not yet connected"); error = true; } catch (ClosedChannelException e) { updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "The connection to the remote host is closed"); error = true; } catch (IOException e) { updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "An Io exception occurred"); error = true; } if (error) { try { // closes the channel if it hasn't being closed already theChannel.close(); } catch (Exception e) { logger.warn("An exception occured while closing the channel '{}': {}", datagramChannel, e.getMessage()); } } // re-establish connection onConnectionLost(); } } } } finally { lock.unlock(); } }