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4.4.2 Messages
Masterswitch status information is broadcast to clients on the CHANNEL_MASTERSWITCH,
initialised at the APTServer start-up .
...
// APTServer.java
// Create the Masterswitch Channel
JASChannel masterswitchChannel =
client.makeChannel(Channels.CHANNEL_MASTERSWITCH);
masterswitchChannel.join();
// Initalise the Masterswitch
JASMasterswitch.getJASMasterswitch( masterswitchChannel );
...
Figure 4-6 Initialising the Masterswitch channel
The MasteswitchChannelWatcher, instantiated within the JASMasterswitch object, monitors
the JASChannel, using the method discussed in Appendix B.5, to send full status information to
new clients joining the Masterswitch channel.
// Monitor the Masterswitch Channel and send any new subscribers all status
// information
private class MasterswitchChannelWatcher extends ChannelAdaptor {
public void channelConsumerAdded(ChannelEvent event) {
try {
log.log( Level.INFO, "Detected new "+ Channels.CHANNEL_MASTERSWITCH +
" subscriber: "+event.getClientName() );
masterswitchChannel.sendToClient( prepareCompleteMsg(),
event.getClientName() );
} catch (JSDTException e) {
log.log( Level.INFO, "Couldn't send new subscriber information");
}
}
}
Figure 4-7 Masterswitch channel monitoring
To keep the status information up to date, the JASMasterswitch must broadcast JASMessages
notifying clients of any change in state. This is achieved by utilising the MasterswitchListener
interface.
Whenever a Masterswitch Event occurs, the JASMasterswitch prepares and sends a
JASStatusMessage with the updated state information. The key values used to identify
properties within the JASStatusMessage are statically defined in JASMasterswitch.java, as
shown below in Figure 4-8.
- Oliver Mather 1
- Abstract 3
- Acknowledgements 5
- Contents 7
- List of Figures 9
- 1 Introduction 11
- 2 APT hardware 13
- 2.3 Mistral 14
- 2.4 Telescope 14
- 2.5 CCD 16
- 2.6 Telescope movement 16
- 2.6.1 Anti backlash motor 17
- 2.6.2 Limit switches 18
- 2.6.3 Tilt sensor 19
- 2.6.4 Macrostation 19
- 2.7 Masterswitch 20
- 2.8 Web cameras 21
- 2.10 Roof 22
- 2.11 ROTSE 23
- ParralelRS232RS232 24
- 3 APT software 25
- 3.3 Command line tools 26
- 3.4.1 Introduction 27
- 3.4.2 Architecture 27
- 3.5 APT server 28
- 4.1 Introduction 31
- 4.3 Code 32
- 4.3.2 Configuration 33
- 4.3.3 SNMP messages 33
- 4.4 JAS integration 34
- 4.4.1 Commands 35
- 4.4.2 Messages 36
- 4.5 Screenshots 37
- 4.6 Conclusion 38
- 5.1 Introduction 39
- 5.2 Architecture 40
- 5.3 Process manager 40
- 5.4 Roof 41
- 5.5 Chat system 43
- Figure 5-8 APT chat system 44
- 5.6 Look and Feel 45
- 5.6.2 Problems 46
- 5.6.3 Screenshots 46
- 5.7 Conclusion 47
- 6 APT software deployment 49
- 6.3.1 Versioning 50
- 6.3.2 Security 51
- 6.4 Compilation 52
- 6.5 Version synchronisation 55
- 6.6 Uploading 56
- 6.7 Conclusion 57
- 7.1 Introduction 59
- 7.2 Hardware 59
- 7.3 Software 59
- 7.3.2 Maintenance 60
- 7.3.3 Client SP server 60
- 7.3.4 Client error control 60
- 7.4 Conclusion 62
- 8 SkinnedTextField 63
- 8.4 TextSkin 64
- 8.5 SkinnedTextFieldDemo 65
- 9 CSIRO SEARFE project 69
- 9.3 Requirements 70
- 9.4 Hardware 71
- 9.5 Architecture 71
- 9.5.1 Data files 72
- 9.6 User interface 73
- 9.6.2 Data visualisation 76
- 9.7.1 Visualisations 80
- 9.8 Conclusion 81
- 10 Conclusion 83
- 10.4 Logging analysis 84
- Bibliography 87
- A. Glossary 89
- B.1. Introduction 91
- B.2. JAS message sender 91
- B.4. Creating JAS commands 91
- B.4.1. JASCommand object 92
- B.4.2. Installing commands 92
- B.5. JAS channel monitoring 93
- C. Software tools 95
- C.1.3. Checkout the code 96
- C.1.4. CVS user interfaces 96
- D. SNMP overview 97
- Response 98
- RequestRequest 98
- E. Astronomy primer 99
- E.1.3. Coordinate epochs 100
- E.2. Astronomical times 101
- E.3. Gamma ray bursts 102
- E.4. Astronomical filters 102
- E.5. Flat fielding 103
- E.6. Cosmic rays 103
- F. Selected code listings 105
- F.1.6. SnmpTrapDaemon.java 121
- F.2. APT deployment system 132
- F.2.3. apt build.xml 134
- F.2.4. lib build.xml 141
- F.3. CSIRO / SEARFE 144
- F.4. TextSkin 145
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