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1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License.
18   *
19   */
20  package org.apache.mina.transport.serial;
21  
22  import gnu.io.CommPortIdentifier;
23  import gnu.io.PortInUseException;
24  import gnu.io.SerialPort;
25  import gnu.io.UnsupportedCommOperationException;
26  
27  import java.io.IOException;
28  import java.net.SocketAddress;
29  import java.util.Enumeration;
30  import java.util.TooManyListenersException;
31  import java.util.concurrent.Executor;
32  
33  import org.apache.mina.core.future.ConnectFuture;
34  import org.apache.mina.core.future.DefaultConnectFuture;
35  import org.apache.mina.core.service.AbstractIoConnector;
36  import org.apache.mina.core.service.IoConnector;
37  import org.apache.mina.core.service.TransportMetadata;
38  import org.apache.mina.core.session.IdleStatusChecker;
39  import org.apache.mina.core.session.IoSessionInitializer;
40  import org.slf4j.Logger;
41  import org.slf4j.LoggerFactory;
42  
43  /**
44   * {@link IoConnector} for serial communication transport.
45   *
46   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
47   */
48  public final class SerialConnector extends AbstractIoConnector {
49      private final Logger log;
50  
51      private IdleStatusChecker idleChecker;
52  
53      public SerialConnector() {
54          this(null);
55      }
56  
57      public SerialConnector(Executor executor) {
58          super(new DefaultSerialSessionConfig(), executor);
59          log = LoggerFactory.getLogger(SerialConnector.class);
60  
61          idleChecker = new IdleStatusChecker();
62          // we schedule the idle status checking task in this service exceutor
63          // it will be woke up every seconds
64          executeWorker(idleChecker.getNotifyingTask(), "idleStatusChecker");
65  
66      }
67  
68      @Override
69      protected synchronized ConnectFuture connect0(SocketAddress remoteAddress, SocketAddress localAddress,
70              IoSessionInitializer<? extends ConnectFuture> sessionInitializer) {
71  
72          CommPortIdentifier portId;
73          Enumeration<?> portList = CommPortIdentifier.getPortIdentifiers();
74  
75          SerialAddress portAddress = (SerialAddress) remoteAddress;
76  
77          // looping around found ports
78          while (portList.hasMoreElements()) {
79              portId = (CommPortIdentifier) portList.nextElement();
80              if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
81                  if (log.isDebugEnabled()) {
82                      log.debug("Serial port discovered : " + portId.getName());
83                  }
84                  if (portId.getName().equals(portAddress.getName())) {
85                      try {
86                          if (log.isDebugEnabled()) {
87                              log.debug("Serial port found : " + portId.getName());
88                          }
89  
90                          SerialPort serialPort = initializePort("Apache MINA", portId, portAddress);
91  
92                          ConnectFuture future = new DefaultConnectFuture();
93                          SerialSessionImpl session = new SerialSessionImpl(this, getListeners(), portAddress, serialPort);
94                          initSession(session, future, sessionInitializer);
95                          session.start();
96                          return future;
97                      } catch (PortInUseException e) {
98                          if (log.isDebugEnabled()) {
99                              log.debug("Port In Use Exception : ", e);
100                         }
101                         return DefaultConnectFuture.newFailedFuture(e);
102                     } catch (UnsupportedCommOperationException e) {
103                         if (log.isDebugEnabled()) {
104                             log.debug("Comm Exception : ", e);
105                         }
106                         return DefaultConnectFuture.newFailedFuture(e);
107                     } catch (IOException e) {
108                         if (log.isDebugEnabled()) {
109                             log.debug("IOException : ", e);
110                         }
111                         return DefaultConnectFuture.newFailedFuture(e);
112                     } catch (TooManyListenersException e) {
113                         if (log.isDebugEnabled()) {
114                             log.debug("TooManyListenersException : ", e);
115                         }
116                         return DefaultConnectFuture.newFailedFuture(e);
117                     }
118                 }
119             }
120         }
121 
122         return DefaultConnectFuture.newFailedFuture(new SerialPortUnavailableException("Serial port not found"));
123     }
124 
125     @Override
126     protected void dispose0() throws Exception {
127         // stop the idle checking task
128         idleChecker.getNotifyingTask().cancel();
129     }
130 
131     public TransportMetadata getTransportMetadata() {
132         return SerialSessionImpl.METADATA;
133     }
134 
135     private SerialPort initializePort(String user, CommPortIdentifier portId, SerialAddress portAddress)
136             throws UnsupportedCommOperationException, PortInUseException {
137 
138         SerialSessionConfig config = (SerialSessionConfig) getSessionConfig();
139 
140         long connectTimeout = getConnectTimeoutMillis();
141         if (connectTimeout > Integer.MAX_VALUE) {
142             connectTimeout = Integer.MAX_VALUE;
143         }
144 
145         SerialPort serialPort = (SerialPort) portId.open(user, (int) connectTimeout);
146 
147         serialPort.setSerialPortParams(portAddress.getBauds(), portAddress.getDataBitsForRXTX(),
148                 portAddress.getStopBitsForRXTX(), portAddress.getParityForRXTX());
149 
150         serialPort.setFlowControlMode(portAddress.getFLowControlForRXTX());
151 
152         serialPort.notifyOnDataAvailable(true);
153 
154         if (config.isLowLatency()) {
155             serialPort.setLowLatency();
156         }
157 
158         serialPort.setInputBufferSize(config.getInputBufferSize());
159         serialPort.setOutputBufferSize(config.getOutputBufferSize());
160 
161         if (config.getReceiveThreshold() >= 0) {
162             serialPort.enableReceiveThreshold(config.getReceiveThreshold());
163         } else {
164             serialPort.disableReceiveThreshold();
165         }
166 
167         return serialPort;
168     }
169 
170     IdleStatusChecker getIdleStatusChecker0() {
171         return idleChecker;
172     }
173 }