altosdroid: Add multi-tracker support
[fw/altos] / altosdroid / src / org / altusmetrum / AltosDroid / TelemetryReader.java
1 /*
2  * Copyright © 2011 Keith Packard <keithp@keithp.com>
3  * Copyright © 2012 Mike Beattie <mike@ethernal.org>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; version 2 of the License.
8  *
9  * This program is distributed in the hope that it will be useful, but
10  * WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12  * General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License along
15  * with this program; if not, write to the Free Software Foundation, Inc.,
16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
17  */
18
19
20 package org.altusmetrum.AltosDroid;
21
22 import java.text.*;
23 import java.io.*;
24 import java.util.*;
25 import java.util.concurrent.*;
26 import android.os.Handler;
27
28 import org.altusmetrum.altoslib_7.*;
29
30
31 public class TelemetryReader extends Thread {
32
33         int         crc_errors;
34
35         Handler     handler;
36
37         AltosLink   link;
38
39         LinkedBlockingQueue<AltosLine> telemQueue;
40
41         public AltosTelemetry read() throws ParseException, AltosCRCException, InterruptedException, IOException {
42                 AltosLine l = telemQueue.take();
43                 if (l.line == null)
44                         throw new IOException("IO error");
45                 AltosTelemetry telem = AltosTelemetryLegacy.parse(l.line);
46                 return telem;
47         }
48
49         public void close() {
50                 link.remove_monitor(telemQueue);
51                 link = null;
52                 telemQueue.clear();
53                 telemQueue = null;
54         }
55
56         public void run() {
57                 try {
58                         AltosDebug.debug("starting loop");
59                         while (telemQueue != null) {
60                                 try {
61                                         AltosTelemetry  telem = read();
62                                         handler.obtainMessage(TelemetryService.MSG_TELEMETRY, telem).sendToTarget();
63                                 } catch (ParseException pp) {
64                                         AltosDebug.error("Parse error: %d \"%s\"", pp.getErrorOffset(), pp.getMessage());
65                                 } catch (AltosCRCException ce) {
66                                         ++crc_errors;
67                                         handler.obtainMessage(TelemetryService.MSG_CRC_ERROR, new Integer(crc_errors)).sendToTarget();
68                                 }
69                         }
70                 } catch (InterruptedException ee) {
71                 } catch (IOException ie) {
72                         AltosDebug.error("IO exception in telemetry reader");
73                         handler.obtainMessage(TelemetryService.MSG_DISCONNECTED, link).sendToTarget();
74                 } finally {
75                         close();
76                 }
77         }
78
79         public TelemetryReader (AltosLink in_link, Handler in_handler) {
80                 AltosDebug.debug("connected TelemetryReader create started");
81                 link    = in_link;
82                 handler = in_handler;
83
84                 telemQueue = new LinkedBlockingQueue<AltosLine>();
85                 link.add_monitor(telemQueue);
86                 link.set_telemetry(AltosLib.ao_telemetry_standard);
87
88                 AltosDebug.debug("connected TelemetryReader created");
89         }
90 }