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5.5 Chat system
Given the distributed nature and complexity of the APT control system it is desirable to be able to
communicate with other users currently logged in. For example, a higher priority user would be
able to ask the current user what they were working on before overriding their control.
This level of communication would also be very useful in a classroom environment. Students
would be communicate remotely with other users controlling the telescope. For example,
although the GUI can display a variety of status information, the intentions of the user in control
could be somewhat difficult to discover. The chat system could be used to simply tell the
connected users why the telescope is slewing to particular coordinates.
The APT chat system is most certainly this simplest of all the APT services, implemented as a
JASChannel designed to send and receive JASChatMessages
i
.
JASChatMessages are sent from a ChatPanel by simply utilising the sendToAll() method
provided by the JAS, as shown below.
...
JASComms.getJASComms().getChatChannel().sendToAll(
new JASChatMessage( System.getProperty("user.name")+": "+msg + "\n" )
);
...
Figure 5-6 Client sending JASChatMessages
When a JASChatComponentManager receives a JASChatMessage it conveys this information
to any registered JASChatComponents, in accordance with the BoundComponent Framework
discussed in Appendix B.3. Since the ChatPanel is a registered JASChatComponent, it receives
this message and subsequently prints it to the screen, as shown in Figure 5-8.
The sole responsibility of the server is to initialise the CHANNEL_CHAT and create the
JASChatManager.
...
// APTServer.java
// Initialise JASChatManager
JASChannel chatChannel = client.makeChannel( Channels.CHANNEL_CHAT );
chatChannel.join();
new JASChatManager( chatChannel );
...
Figure 5-7 JASChatManager usage
The JASChatManager simply creates a ChannelMonitor, as shown in Appendix B.5, which
broadcasts notification messages when users join and leave the chat. Joining and leaving the
chat is analogous to joining the leaving the chat channel.
i
Currently implemented as a String
- 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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