git.gag.com Git - fw/altos/blob - altoslib/AltosIdleReader.java

   1 /*
   2  * Copyright © 2016 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  16  */
  17
  18 package org.altusmetrum.altoslib_11;
  19
  20 import java.text.*;
  21 import java.io.*;
  22 import java.util.concurrent.*;
  23
  24 public class AltosIdleReader extends AltosFlightReader {
  25         AltosLink       link;
  26         boolean         remote;
  27         AltosState      state = null;
  28         AltosIdleFetch  fetch;
  29         long            next_millis;
  30         static final long       report_interval = 5 * 1000;
  31         static final long       minimum_delay = 1 * 1000;
  32
  33         private void start_link() throws InterruptedException, TimeoutException {
  34                 if (remote) {
  35                         link.start_remote();
  36                 } else
  37                         link.flush_input();
  38         }
  39
  40         private boolean stop_link() throws InterruptedException, TimeoutException {
  41                 if (remote)
  42                         link.stop_remote();
  43                 return link.reply_abort;
  44         }
  45
  46         public AltosState read() throws InterruptedException, ParseException, AltosCRCException, IOException {
  47                 boolean worked = false;
  48                 boolean aborted = false;
  49
  50                 if (state == null)
  51                         state = new AltosState();
  52                 else
  53                         state = state.clone();
  54
  55                 long    delay = next_millis - System.currentTimeMillis();
  56
  57                 if (delay > 0)
  58                         Thread.sleep(delay);
  59                 next_millis = System.currentTimeMillis() + report_interval;
  60                 try {
  61                         try {
  62                                 start_link();
  63                                 fetch.update_state(state);
  64                                 if (!link.has_error && !link.reply_abort)
  65                                         worked = true;
  66                         } catch (TimeoutException te) {
  67                         } catch (AltosUnknownProduct ue) {
  68                                 worked = true;
  69                         }
  70                 } finally {
  71                         try {
  72                                 aborted = stop_link();
  73                         } catch (TimeoutException te) {
  74                                 aborted = true;
  75                         }
  76                         if (worked) {
  77                                 if (remote) {
  78                                         try {
  79                                                 state.set_rssi(link.rssi(), 0);
  80                                         } catch (TimeoutException te) {
  81                                                 state.set_rssi(0, 0);
  82                                         }
  83                                 }
  84                         }
  85                 }
  86
  87                 long    finish = System.currentTimeMillis();
  88
  89                 if (next_millis - finish < minimum_delay)
  90                         next_millis = finish + minimum_delay;
  91
  92                 return state;
  93         }
  94
  95         public void close(boolean interrupted) {
  96                 try {
  97                         link.close();
  98                 } catch (InterruptedException ie) {
  99                 }
 100         }
 101
 102         public void set_frequency(double frequency) throws InterruptedException, TimeoutException {
 103                 link.set_radio_frequency(frequency);
 104         }
 105
 106         public void save_frequency() {
 107                 AltosPreferences.set_frequency(link.serial, link.frequency);
 108         }
 109
 110         public void set_callsign(String callsign) throws InterruptedException, TimeoutException {
 111                 link.set_callsign(callsign);
 112         }
 113
 114         public AltosIdleReader (AltosLink link, boolean remote)
 115                 throws IOException, InterruptedException, TimeoutException {
 116                 this.link = link;
 117                 this.remote = remote;
 118                 this.next_millis = System.currentTimeMillis();
 119                 fetch = new AltosIdleFetch(link);
 120         }
 121 }