Enabled SO_REUSEADDR socket option of the ArtNetServer listener #6
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This allows two applications, or more, to bind to the same socket, thus listening and reacting to the same DMX Input packets. It only works as long as all of the application also set the SO_REUSEADDR socket option. See also: http://download.java.net/jdk7/archive/b123/docs/api/java/net/DatagramSoc ket.html#setReuseAddress(boolean)
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@olange , thanks for your contribution. I'm very sorry for this late response. I'll take a look at your work as soon as possible! @jgastonraoul, I guess you also missed this great news... |
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No problem. Although its a very small change (one line of code to activate this option on the socket), I understand you still need to check for possible regression issues. I successfully used an ArtNet4j library patched with this fix for a live theater play two weeks ago. About my use case for the theater play: the patch allowed me to consume DMX events sent by a Cameo Control 6 console that was on-stage, simultaneously from MadMapper and from a Processing Diaporama app. MadMapper is indeed also honoring this SO_REUSEADDR option, which allowed both apps to listen to then same socket and DMX messages. One cursor (DMX channel 1) of the console did control the master luminosity level of MadMapper's output, and two other cursors (DMX channels 2 and 3) were controlling the Processing animation. Both applications where listening to ArtNet/DMX events over an Enttec ODE. The processing diaporama app was using the patched ArtNet4j library and was «behind» MadMapper, delivering its frames with the Syphon protocol. Hope this helps... Regards. |
Setting this option allows two applications, or more, to bind to the same socket [1], thus to listen and react to the same DMX Input packets. It only works as long as all of the application also set the SO_REUSEADDR socket option.
I used it successfully to have MadMapper (a projection mapping application written in C, which obviously sets the SO_REUSEADDR socket option) and a Processing application (written in Processing/Java and using an Artnet4j-Elios library patched with this change [2]) reacting to the same DMX Input events, which were sent from a small lightning console via DMX and received as ArtNet datagrams via Enttec's OpenDMX Ethernet box on the computer running the apps.
See also:
[1] http://download.java.net/jdk7/archive/b123/docs/api/java/net/DatagramSocket.html#setReuseAddress(boolean)
[2] https://github.com/olange/artnetP5