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; either version 2 of the License, or
   7  * (at your option) any later version.
   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 package org.altusmetrum.altoslib_11;
  20
  21 import java.text.*;
  22 import java.io.*;
  23 import java.util.concurrent.*;
  24
  25 public class AltosIdleReader extends AltosFlightReader {
  26         AltosLink       link;
  27         boolean         remote;
  28         AltosState      state = null;
  29         AltosIdleFetch  fetch;
  30         long            next_millis;
  31         static final long       report_interval = 5 * 1000;
  32         static final long       minimum_delay = 1 * 1000;
  33
  34         private void start_link() throws InterruptedException, TimeoutException {
  35                 if (remote) {
  36                         link.start_remote();
  37                 } else
  38                         link.flush_input();
  39         }
  40
  41         private boolean stop_link() throws InterruptedException, TimeoutException {
  42                 if (remote)
  43                         link.stop_remote();
  44                 return link.reply_abort;
  45         }
  46
  47         public AltosState read() throws InterruptedException, ParseException, AltosCRCException, IOException {
  48                 boolean worked = false;
  49                 boolean aborted = false;
  50
  51                 if (state == null)
  52                         state = new AltosState();
  53                 else
  54                         state = state.clone();
  55
  56                 long    delay = next_millis - System.currentTimeMillis();
  57
  58                 if (delay > 0)
  59                         Thread.sleep(delay);
  60                 next_millis = System.currentTimeMillis() + report_interval;
  61                 try {
  62                         try {
  63                                 start_link();
  64                                 fetch.update_state(state);
  65                                 if (!link.has_error && !link.reply_abort)
  66                                         worked = true;
  67                         } catch (TimeoutException te) {
  68                         } catch (AltosUnknownProduct ue) {
  69                                 worked = true;
  70                         }
  71                 } finally {
  72                         try {
  73                                 aborted = stop_link();
  74                         } catch (TimeoutException te) {
  75                                 aborted = true;
  76                         }
  77                         if (worked) {
  78                                 if (remote) {
  79                                         try {
  80                                                 state.set_rssi(link.rssi(), 0);
  81                                         } catch (TimeoutException te) {
  82                                                 state.set_rssi(0, 0);
  83                                         }
  84                                 }
  85                         }
  86                 }
  87
  88                 long    finish = System.currentTimeMillis();
  89
  90                 if (next_millis - finish < minimum_delay)
  91                         next_millis = finish + minimum_delay;
  92
  93                 return state;
  94         }
  95
  96         public void close(boolean interrupted) {
  97                 try {
  98                         link.close();
  99                 } catch (InterruptedException ie) {
 100                 }
 101         }
 102
 103         public void set_frequency(double frequency) throws InterruptedException, TimeoutException {
 104                 link.set_radio_frequency(frequency);
 105         }
 106
 107         public void save_frequency() {
 108                 AltosPreferences.set_frequency(link.serial, link.frequency);
 109         }
 110
 111         public void set_callsign(String callsign) throws InterruptedException, TimeoutException {
 112                 link.set_callsign(callsign);
 113         }
 114
 115         public AltosIdleReader (AltosLink link, boolean remote)
 116                 throws IOException, InterruptedException, TimeoutException {
 117                 this.link = link;
 118                 this.remote = remote;
 119                 this.next_millis = System.currentTimeMillis();
 120                 fetch = new AltosIdleFetch(link);
 121         }
 122 }